Knitting technology, Third Edition

Fig. 20.3
Cam system elements of a circular purl machine.

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Circular garment-length machines
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are transferring needles pass across the spring-loaded cam which presses down on
them, causing the front of the slider to pivot upwards and unhook itself from the
transferred needle. Needles of jacks non-selected at I but selected at II will pass
through the upper cam track at knit height. Cam LII lowers the spring-tailed jacks
ready for the next double-selection sequence.
In the knitting cam-boxes, certain cams are bolt cams of the plunge type, which
are introduced or withdrawn out of the track as required for any cam-box revolu-
Fig. 20.4
Part of a purl garment knitting sequence.

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250
Knitting technology
tion. When fully in action, they deflect all sliders passing through, when half in action
they only deflect long butt sliders, and when out of action the cam-track is clear.
Cams W are the welt bolt cams, which guard the entrance to the welt tracks and,
when fully in action, cause all sliders with needles to knit. Cam W is in for knitting
or the transferring of all needles in the bottom cylinder, but is out of action for
selected knit miss or knit tuck stitches. In the top cylinder there is no selection so
therefore those bolt cams are used during pattern selection. Cam W is employed
when knitting, transferring down or receiving transferred up needles in the top cylin-
der. Half in action, it is employed for knitting or transferring on a 1 
¥
1 arrange-
ment, and when fully out of action, needles in the top cylinder will miss. Cam tb is
the bolt cam for transferring needles down from the top cylinder and works in con-
junction with spring loaded cam x.
In the bottom cylinder, the bolt cam TC can be introduced to cause needles con-
trolled by sliders in the welt track to be lifted to tuck. When employed in conjunc-
tion with cam L0, the needles are immediately lowered to miss but their latches are
opened.
Figure 20.4 shows part of a purl garment knitting sequence.