From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
14
Fig.
32.
Setting Height of Check Spring
Fig.
33.
Adjusting Tension on Check Spring
HEIGHT SETTING
PREPARATION:
Thread the machine.
CHECK:
Turn
machine pulley
over
toward you slowly. When
take-up lever begins to rise, spring
K, Fig.
32
"checks",
showing a slight dip
and
a return to its highest position.
Later,
as
take-up lever
approaches
top
of
stroke,
setting the stitch, this "check" spring
K
should
be
drawn
all the
way
down.
As
lever descends, check spring
K
returns to rest.
TO
SET
THE
CHECK SPRING
SETTING:
To
obtain the slight dip
in
check spring when take-up
begins to rise, loosen screw
L,
Fig.
32.
Turn
stud
M,
Fig.
32
(at
the same time turning entire tension as-
sembly) either
over
toward
left to
lower
the spring's
resting position and decrease
its
movement, or
over toward right to raise the spring's resting
position and increase
its
movement.
Securely tighten
set screw
L.
VARIATIONS (FOR MACHINE
331K4):
Under certain conditions
of
tacking,
it
may
be
neces-
sary
to set the check spring higher than
it
is
otherwise
normally set.
TENSION SETTING
PREPARATION:
Thread the machine. Securely tighten
set
screw
L,
Fig.
33.
Make certain thumb nut
is
on stud
M,
Fig.
33.
CHECK:
Tension on check spring
K, Fig.
33,
should
be
suffi-.
cient to ensure action
at
top
speed;
but
still
light
enough to permit itself to
be
drawn all the
way
down
before
any
thread
is
drawn through the tension discs,
as
take-up lever
approaches
height
of
stroke.
Check spring setting should
be
reviewed
each
time a
different fo9t
is
applied
to machine.
SETTING:
Using
a
large
screwdriver
in
slot
of
stud
M,
turn stud
either
over
toward left to
decrease
tension
or
over
toward right
in
increase
it,
as
shown
in
Fig.
33.
VARIATIONS:
The tension on the check spring may require a
different setting, depending upon the
thread
and
material used. Heavier
thread
or
bulkier material re-
quires more tension to ensure correct
thread
control.
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