TO
REGULATE THE
LENGTH
OF
THE STITCH
To
change the
length
of the
stitch
stop the
machine,
then press
down
the
stitch
regulator plunger "AC",
g. 14 in the
bed
and
at the
same
time turn the machine
•pulley
toward the operator
until
the plunger enters a
notch
in the teed driving eccentric.
Turn
the machine
pulley
until
the desired
number
of
stitches
per
inch
on
the machine pulley is opposite the reference mark on
the
front
of
the
arm.
Number
6 on the scale
will
indicate the longest
stitch
and
number
30
the
shortest
one
which can
be
obtained
with
this
machine.
Caution:
Never
depress the
stitch
regulator plunger
while the machine is in operation.
-rf
,10
AE
AD
Figure 14
TO
SET
THE
WIDTH
OF
THE
ZIG-ZAG
STITCH
By
turning the needle vibrator adjusting knob "AE",
Fig. 14 on the front side of the arm, the desired bight
can be set
and
the
same
checked on the dial "AD",
Fig. 14 in five successive steps of
1/32
inch = 0.8 mm
each.
The setting is to be done when the machine is out of
•^^eration.
The
dial
reading
"O"
shows
the
straight
•ft^-hch
and
the dial reading
"5"
indicates the widest
bight.
TO
CLEAN
THE
HOOK
AND
THE
THREAD
WAYS
In
order to preservethe
life
of the
hook
it
is
necessary
to clean the hook by means of a brush once or twice
daily depending on the materials used.
Two
thread cutters "AF",
Fig.
15 are mounted in the
thread
ways
by
the rotary take-up to
avoid
wrapping
of the upper thread on the rotary take-up. After each
upper thread breakage the rotary take-up must be
checked for any remains of thread. These remains must
be removed before rethreading.
Figure
15
Caution:
Attention
to
the
above
instructions
will
as
sure
proper
performance
of
the
457 G 1 machine.
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