•Lapping diagram are drawn around
horizontal rows of points that rep
resent needles in plain view, usually
assuming the pattern mechanism
to be on the right. As the guides position
themselves in the spaces between the
needles the positions between vertical
columns of points can be given chain link
numbers commencing with the ‘O’ position
which is to the right of the right hand
column of points. Provided the dire
ction and extent of the overlaps are
correctly indicated in the lapping diagram
and chain notation, the under laps will
always be corrected position as ea
ch extends from the end of one overlap to
the start of the next.
Basic overlap/under lap variations:
guide bar lapping movements are composed
of one or more of the following lapping
variation
1.An overlap followed by an underlap in the
opposite direction (closed lap)
2.An over lap followed by an underlap in the
same direction (open lap)
3.Only overlaps and no underlaps (open laps)
4.Only underlaps and no overlaps (Laying-in)
5. Neitheir overlaps nor underlaps
lapping.
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