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FEED LINKAGES ON BARRING
AND
TACKING
MACHIN ES:
CENTERING
LATERAL F
EED
Chock:
Tho
la teral
feed
linkage, when
correct ly
adjusted,
wi
l
l
ensure
t
hat
when
the leng th of bar
or
tac
k
is
changed,
it w
i
ll change
in si
ze
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
con be
returned
to its orig inal
position
after
adjustment
has been
made,
e.
g.,
insert a
piece
of
paper
under clamping foot,
engage
machine
into
"run" position, turn pulley over toward the right
$ ido of
mach
ine slow ly unti
l
nced
lo
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,
loosen
lateral pivot
driving
arm pinch
screw and driving arm
pinch
screw,
Fig. 30A, ond
position foed
plate carrier
bar
so
it
is
centered
lat-
era lly across the
cy
linder
(or
center of
clamp 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
dri
ving
arm should be parallel, os
shown
in
F ig.
30A.
If necessary,
move linkage to
obtain this
pos
ition. Then
tighten the
la teral
pivot
driving
arm
pinch
screw.
Next,
return
f~d
carrier
bar to
ih
origina
l
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
the
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
rela-
tion to
the needle
o s instructed
under
CEN
TER-
ING LATERAL FEED.
DRIVEN
. - - - - - - - A R M
DRIVING ARM
STUD
NUT
Fig. 30A. Adjusting Lateral Feed Linkage
18
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