Knitting action of the plain straight bar frame

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Figure 17.2 shows the cross-section of the knitting head containing the following elements:

A Bearded needle, having a cranked end for location in the tricked and drilled needle bar.

B Sinker - only one between every other needle space - with a reinforced back and, at the front, a 'catch' to sink the yarn around the needles, and a 'neb' to separate the old and new loops until knock-over. C Divider, occupying each remaining space, usually having the same shaped front as the sinker but with an extended tail at the back. D Knocking-over bit - one directly beneath each sinker and divider - having a

'throat' for holding the loops and a 'nose' for knocking-over. E Needle bar, having a compound horizontal and vertical movement. F Striking jack, fulcrummed at its lower end, each one with its 'nose' resting on a sinker back, and a 'spring' exerting pressure on its 'tail'.

Knitting Motion Straight Bar Frame
Fig. 17.2 Knitting head of the straight bar frame.

G Catch bar, extending the full width of the knitting head, having forward and backward, as well as vertical, movement. H Yarn carrier, which traverses in alternate directions across the head from one course to the next - up to six carriers may be available. The carrier is connected to a reciprocating carrier rail by friction, and when the carrier is arrested by its carrier stop, the carrier rail completes its full traverse, driven by the coulier cam and punching through the carrier friction. J Falling bar, which is a stop that cushions the advance of the sinkers and dividers.

Figure 17.3(a-f) shows the movement of the knitting elements to produce one course of loops:

Figure 17.3(a-f) shows the movement of the knitting elements to produce one course of loops:

Coulier Sinkers

(b) Sinking the loops

Fig. 17.3 Movement of knitting elements.

(c) Dividing the loop

(d) Pressing

(d) Pressing

Thread laying (a). The carrier moves across the knitting head, laying the yarn on the noses of the sinkers and dividers and on the beard side of the needles.

Sinking (b).The slurcock (one for each knitting head), travelling behind the carrier, contacts the jacks (Fig. 17.2); it is shaped so that each jack in turn pushes the sinker forwards to kink a loop around every two adjacent needles.

Dividing (c). The catch bar moves the dividers forwards, collectively, whilst the needle bar tips slightly outwards to allow the double loops to be divided into equal-sized needle loops around every needle.

Pressing (d) and landing (e). The needle bar descends, placing the new loops inside the hooks of the beards. The catch bar is now lowered so that the sinkers, as well as the dividers, are collectively controlled by it for the rest of the knitting cycle. They now start to withdraw. The needle bar moves towards the sinker verge, causing the beards to be pressed. A further downward movement of the needle

(f) Knocking-over the loops

(f) Knocking-over the loops

bar 'lands' the previous course of loops, resting on the knock-over bits, onto the closed beards.

Drop-Off. As the needle bar moves away from the pressing-edge, the sinkers and dividers withdraw so that the newly-formed course of loops drops off their noses onto the knocking-over bits.

Completion of knock-over (f). The needle bar descends to its lowest position. As the heads descend below the belly of the knocking-over bits, the old course of loops is collectively knocked-over.

Holding-Down. As the sinkers and dividers move collectively forward to hold down the fabric, the needle bar rises to the thread-laying position. The catch bar is slightly raised to release the sinkers for individual movement at the start of the next course.

On coarser gauge machines it is possible to accommodate sinkers with reinforced butts between every needle space, thus eliminating dividers and their action. Some machines have selvedge dividers with a lower forward ledge so that when the yarn carrier stops over one divider, the next divider inwards from it will be the last to take that traverse of yarn, which will slide into its specially-shaped lower throat and form a tight selvedge.

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