- Loop formation
- Holding-down
- Knocking-over
Friday, May 18, 2012
Fig. 1 Action of the loop-forming sinker. |
The second and more common function of sinkers on modern machines is to hold down the old loops at a lower level on the needle stems than the new loops that are being formed, and to prevent the old loops from being lifted as the needles rise to clear them from their hooks.
In Fig. 1, the protruding nib or nose of’ sinker (N) is positioned over the sinker loop of the old loop (O), preventing it from rising with the needle. On tricot warp knitting machines and single bed weft knitting machines, a slot or throat (T in Fig.2) is cut to hold and control the old loop.
Fig. 2 Action of the knock-over sinker. |
The third function of the sinker – as a knock-over surface – is illustrated in Fig. 2 where its upper surface or belly (B) supports the old loop (O) as the new loop (NL) is drawn through it. On tricot warp knitting machines the sinker belly is specially shaped to assist with landing as well as knock-over. On raschel warp knitting machines, many V-bed flats, and cylinder and dial circular machines, the verge or upper surface of the trick-plate serves as the knock-over surface. On some machines, the knock-over surface moves in opposition to the descent of the needle.
Fig. 3 Loop forming by warp guides. |
Label :
Sinker
5
Textile Technology: Basic Mechanical Working Process of Sinker in Knitting Technology
Loop formation Holding-down Knocking-over On bearded needle weft knitting machines of the straight bar frame and sinkerwheel type (as on Lee...
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