SETTING:
Loosen screw E, Fig.3. Turn stud F, Fig. 3 (at the
same time turning entire tension assembly) either
over toward left
to
lower check spring and decrease
its movement,
or
over toward right
to
raise check
spring and increaseits movement. Securelytighten set
screw
E.
NOTE: Under certain conditions of tacking, it
may be necessary to set the check springhigherthan
it is otherwise normally set.
CAUTIGN:
Check spring height setting must be
checked each time a different foot is applied to
machine.
TO
SET
CHECK
SPRING
TENSION
PREPARATION:
Thread the machine. Securely tighten set screw E,
Fig. 4. Make certain thumb
nut
is on stud F, Fig. 4.
CHECK:
Tension on check spring D. Fig. 4, should be suf
ficient to ensure action at top speed;
but
still light
enough to permit itself to be drawn all the way down
(as take-up lever approaches height of stroke) before
any thread is drawn through
the
tension discs.
SETTING:
Using a large screwdriver in slot
of
stud F, turn
stud
either
over
toward
left
to
decrease
tension
or
over to right
to
increase
it,
as shown.
MORE
tension
LESS
TENSION
H
GHER
LOOSEN
LOWER
Fig. 3
TIGHTEN
Fig. 4
NOTE: The tension on the check spring may require different settings depending upon the size
of
thread used.
Heavier thread requires more tension to ensure correct thread control.
-3
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