lowest point of its stroke, try to rotate the driving pulley,
and
check to see
that the needle bar does not move up and down. This done, pull out the
gauge,
and
cautiously turn the driving pulley until the clomp
bears
against
the
needle
bor
frame.
When
in this position,
the
needle
bar
has
risen
V32",
or
2.4 mm, from the lowest point of its stroke,
and
the point of the shuttle
should be
opposite
the
center
line of the needle. If adjustment is required,
loosen screws a (Fig. 20) in the shuttle driver, and rotate the shuttle driver
on its shaft, as may be required.
When
you retighten the shuttle driver
set screws, make sure the shuttle driver shaft has no end play.
Shuttle
driver
Shuttle
Fig. 20 Shuttle driver mounting
(2)
Needle
Bar Height
When the needle
bar
has risen
V32"
from the lowest point of its stroke,
the point of the shuttle should be Vii", or 1.5 mm, above the top of the
needle eye
(Fig.
21).
Make sure the needle eye is not positioned below the
beveled
edge
of the shuttle driver when the needle is at its lowest position
becouse this may result in skipping of stitches
and
thread breaking (Fig. 22)
Fig.
21
Setting needle bar at correct height
35
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