Saturday, December 17, 2016

Fashioning Action of the Straight bar Frame Knitting Machine

Straight bar frame knitting machine:
Knitting machine is a device which is used to create knitted fabrics in a semi or fully automated fashion. There are various types of knitting machines, ranging from the simple, non-mechanical, to the highly complex and electronic. Straight bar frame is one type of knitting machine.

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.

Fashioning Action of the Straight bar Frame Knitting Machine:
The fashioning action or loop transfer for either narrowing or widening is performed in following steps:
Fashioning action of the Straight bar frame
Fig: Fashioning action of the Straight bar frame
a) The fashioning points or transfer needles descend and the needle bar tips backwards to clear them.

b) The needle bar moves towards the points causing the beards of needles engaged with points to be pressed and boxed or located in the grooves of the points.

c) The sinkers and dividers, which are collectively controlled by the catch bar, retire, and the needles and points descend together below the knocking-over bits so that the loops are cast-off on to the points.

d) The needles and points now rise and move clear of each other so that the points can make the sideways 'fashion rack' at the selvedge either by one needle for widening or by one, two or four needles for narrowing.

e) The needles and points now descend and the needles box with the points again so they receive the transferred loops. As the needles and points descend below the sinkers, the sinkers and dividers move forwards to hold down the loops.

f) Once the needles have slid up into the grooves of the points to receive the loops, the points rise to their high inoperative position. The needle bar rises causing the transferred loops to slip down on to the stems and the cam shaft is shogged back to the left again so that knitting can restart.