Singer 211G166 - Needle Bar Rock Frame Adjustments; Synchronous and Differentiated Feed Adjustment

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14
ADJUSTMENT
OF
NEEDLE
BAR
ROCK
FRAME
(Figures
28,
29,
30
and 31)
On
the
211
G
165/265
MACHINES
the
needle
bar
rock frame is
driven
by
a compound
drive
mechanism which
can
be
mode synchronous
or
differentiated
with
the
lower
feed.
It
must
be
adjusted
so
that,
in
zero
position
of
the
synchronous
feed,
the
distance
bet-
ween
the
vibrating
presser
bot
in
the
r;ieedle
bar
rock frame
and
the
vertically
moving
presser
bar,
in
the
arm is
21/64
inch
=
8.33
mm
(see Figure
31).
Fpr synchronous feed and for
alignment
of
the
needle
bar
rock frame, adjust
the
feed
driving
eccentric
for
zero
stitch
length.
Loosen lock nut
l
and
bearing
nut
2.
Then
move screw 3
to
its normal
operating
position in crank
4,
where
the
drop
feed
and
up-
per feed motions
ar
equalized.
Remove the front arm
cover,
loosen screw
5,
end
adjust
the
needle
bar
rock frame to
the
vertically
moving presser
bar
to
obtain
the
distance
between
the
vibrating
presser
bar
and
the
vertically
moving presser
bar
as shown in Figure
31.
For
differentiated
feed,
adjust
the
feed driving
eccentric
to
the
desired number
of
stitches
per
inch.
Loosen lock nut
l
and
bearing
nut
2.
Move screw 3 in
the
adjus-
table
crank to
the
back in
order
to
get
a larger movement -of the upper feed
relative
to the lower
feed,
and to
the
front for a smaller movement.
2
3
Figure 28