Features of the Raschel Warp Knitting Machine
B.J.Group, Mawna, Gazipur
B.J.Group, Mawna, Gazipur
There are various types of knitting machine. Among them Raschel knitting machine is one of the most important knitting machines to produce knitted fabric. Rachel Warp Knitting Machine is used for lace fabric and trimmings. It is also used to produce in outdoors and military fabrics for products such as backpacks.
|Raschel warp knitting machine|
Raschel warp knitting machines have the following important features:
- Raschel machines used latch needles together with a latch wire or blade.
- Raschel machines have a gauge expressed in needles per two inches (5cm) so that for example, a 36 gauge Raschel will have 18 needles per inch.
- Their chain links are usually numbered in even numbers 0, 2, 4, 6, 8 etc., generally with two links per course.
- Raschel sinkers only perform the function of holding down the loops whilst the needles rise.
- Raschel sinkers are not joined together by a lead across their ends nearest to the needle bar so they can move away to wards the back of the machine for the rest of the knitting cycle.
- The needle trick-plate verge acts as a fabric support ledge and knock-over surface.
- The fabric is drawn downwards from the needles almost parallel to the needle bar at an angle of 120 to 160 degrees by a series of take-down rollers.
- The warp beams are arranged above the needle bar centred over the rocker shaft so that warp sheets pass down to the guide bars on either side of it.
- The beams are placed above the machine so it is accessible at the front for fabric inspection and at the back for mechanical attention to the knitting elements.
- The guide bars are threaded commencing with the middle bars and working out wards from either side of the rocker shaft.
- The guide bars are numbered from the front of the machine.
- With the Raschel arrangement there is accommodation for at least four 32 inch diameter beams or large numbers of small diameter pattern beams.
- The accessibility of the Raschel machine, its simple knitting action and its strong and efficient take-down tension makes it particularly suitable for the production of coarse-gauge openwork structures employing pillar stitch and inlay lapping variations and partly-threaded guide bars which are difficult to knit and hold down with the tricot arrangement of sinkers.
- Additional warp threads may be supplied at the selvedges to ensure that these needles knit fabric, otherwise a progressive press-off of loops may occur.