As a result of this adjustment, the stitches are spaced farther
apart
or
packed more closely together, while the total number of stitches per tack
remains
unchanged.
If the
stitches
are spaced too for opart, the
tack
looks
ugly. And, conversely, if they are packed too closely together particu
larly in leather or plastic material , the thread is
likely
to cut through
the material. To facilitate establishing the correct
amount
of crosswise
clamp travel, the adjustability of ball screw stud 2 has been limited to
suit the type of work being performed by a given subclass mochine.
1 =
Work
clamp
feet
2 =
Feed
plate
carrier
bar
3 =
Workpiece
4 = Feed plate
5 =
Wing
nut
6 = Feed across regulator
Wrong
Needle
is
not
centered
in
feed
plate cutout. Adjustment required.
Right
Right-
and
left-hand
ends
of
feed
plate
cutout
ore
equidistant
from
the
needle.
7 =
Ball
screw
stud
8 =
Feed
across
shaft
9 =
Feed
across
shaft
front
crank
10 - Adjust
Fig. 31 Timing
the
feed
across
motion
44
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