BA
BE
Figure 21
To set a needle
bar
which has no timing marks, the
feeding mechanism must be set on zero stitches (syn
chronous on the
211
G 155
MACHINE).
Insert a straight
needle
in
the
needle
bar.
Then
set
the
needle
bar
so
that,
when
it rises
V32
inch = 2,4 mm from its lowest
position,
the
point
of
the
hook
is
at
center
line
of
the
needle
and
the
eye
of
the
needle
about
Vie
inch
=
1,6 mm below the point of the hook.
ADJUSTMENT
OF
THE
HOOK
(Figures 22 and
23)
To adjust the hook relative to the needle (distance
and
timing) remove the throat plate
and
set the feed
ing mechanism on zero stitches (synchronous on the
211
G 155
MACHINE).
Check the needle
bar
height for
proper
adiustment
and
use
a
straight
needle
which
has
been
correctly
inserted
to
its
stop.
Turn
the
machine
pulley
over
towards
you
until
the
lower
mark
on
the
needle
bar
is just visible at the end of the needle
bar
rock frame on the upward stroke of the needle bar.
In
this position the hook point should be
about
V16
inch =
1,6 mm
above
the needle eye on the center line of the
needle
and
as close as possible to it without touching.
The needle should barely touch the hook needle
guard
"AW", Fig. 23, without being deflected by it.
To adjust the distance between hook point
and
needle, maintain the hook point at the center of the
needle, loosen screws "AU", Fig. 22, underneath the
bed
of
the
machine,
and
move
the
hook
saddle
to
the
right or left as required. Then securely tighten screws
"AU".
10
Figure 22
To time the hook point relative to the center line of
the
needle,
loosen
the
set
screws on
the
hub
of
the
hook
driving
gear
"AV", Fig. 22. Then tap the
gear
to the
AW
Figure
23
right, if the hook time is to be advanced, and to the
left
if it is
to
be
retarded.
The hook needle guard "AW",
Fig.
23,which
Is
mount
ed on the outer periphery of the nook, should be ad
justed
so that theneedle can
never
touch
the
hook
point
In
the
event
that
it is
deflected
in
that
direction.
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