FEED
LINKAGES
ON
BARRING
AND
TACKING
MACHIN
ES:
CENTERING
LAT
E
RA
L FEED
Chock:
Tho la t
eral
f
ee
d lin
kage,
when
correct
ly
adjusted
,
will
ensu
re t
hat
when
the
l
eng
th of
bar
or
tac
k is
changed,
it will ch
ange
in
size
equally
on both
sides
of
the
throat
plate
need
le
hole.
Adjustment:
First
determine the position of the
needle
in
re·
lotion to the clamping foot so that the feed carrier
bar
co
n be returned to its origi
nal
position after
adjustment has
be
en m
ad
e, e. g., insert a piece
of
paper under
cla
mpi
ng
foot, engage
mac
hine into
"run"
positio
n, t
urn
pulley
over toward
the
right
$ido of mach ine slowly until ncedlo
iu~t
punctures
the
paper, then turn
pulley
over
toward left
side
of
machine
lo
r-aise the needle.
Leave
poper under the
clomp
during
adjustment
as
this
will
indicate
the
original
position
of
the
needle.
To
adjust,
l
oosen
lateral pivot
driving
arm
pinch
screw
and driving
arm
pinch
screw,
Fig.
30A,
ond
position
foed pl
ate
carrier bar
so
it
is
cente
red
lat-
era
lly
across
the
cy
li
nder (or
center
of
cla
mp
ng
feet
is o ligned with the
needle).
DRIVING
ARM
PINCH
SCREW
FEED
PLATE
CARRIER
BAR--~
At
this
position,
the
lateral
feed
rock
shaft
driven and the drivi
ng
arm
should be
parallel,
os
shown in F ig. 30A.
If
necessary,
move li
nkage
to
obtain this
pos
i
tio
n. Then tighten the lateral
pivo
t
driving
ar
m pinch
screw.
Next,
return
f~d
carrier bar to
ih
original
posi·
lion.
(A
check
coo
be
modo
by lowering
the
needle
into puncture halo
previously
mode
on
poper.)
Then
ti~tcn
the
d-ivin'
arm pinch screw.
TO ADJUST LENGTH OF TACK
Adjustment:
Loosen t
he
lateral
driving
arm
stud nut,
Fig.
30A,
and
slide
stud
too¥ard
front
or
machine
fo
increoc•
tho length
of
tack
(acron
tho
bee).
To
decrease
the
length
of
tack,
slide
stud
toward
rear
of
mach
ne.
Then
tighoen
stud
nut.
NOTE:
After
his
adjustment
is
made,
it
may be
necessary to
adjust
the food carrier bar in rel
a-
tion
to
the
needle
o s instructed under CENTER-
ING LATERAL
FEED.
DRIVEN
.-------ARM
DRIVING
ARM
STUD
NUT
Fig.
30A. Adjusting
Lateral
Feed
Linkage
18
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