Knitting Action of the Plain Straight Bar Frame

Straight bar knitting machine is a specific type of machine having a vertical bar of bearded needles whose movement is controlled by circular engineering cams attached to a revolving cam-shaft in the base of the machine? The length of the machine is divided into a number of knitting heads (‘sections’ or ‘divisions’) and each head is capable of knitting a separate but identically-dimensioned fashion shaped garment panel.

Knitting Action of the Plain Straight Bar Frame:
The following figures show the movement of the knitting elements to produce one course of loops:
Knitting action or movement of plain straight bar frame
Knitting action or movement of plain straight bar frame
a) Thread laying:
The carrier moves across the knitting head laying the yarn on the noses of the sinkers and dividers and the beard side of the needles.

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

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

d) Pressing and e)Landing:

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 with draw. The needle bar moves towards the sinker verge causing the beards to be pressed. A further downward movement of the needle bar 'lands' the previous course of loops, resting on the knocking-over bits, on to the closed beards.

f) Completion of knock-over:
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. 
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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