Leather Machine COBRA CLASS 3 - User Manual

MAINTENANCE
AND
TIPS
FOR THE
COBRA
CLASS
3, 4,
& KING
COBRA,
PRO
2000, ARTTSAN
TORO
3000,
3200,4c,c,0,
cowBoy
3500, 4500,
TECHSEW
5100, SEW PRO 44L,
KINGMAX,
MASTER LOCK,
JUKI 441. AND
OTHER
441
STYLE MACHINES
Thread
1) Make
sure
that the thread
you
are
using is
not
dry, old,
or
damaged
by the elements.
Keep
thread
in
a
plastic
bag
to
help
protect
it.
Make
sure that the
thread
does not untwist, if
so, then the bonding agents have
evaporated
or weren't very
good
to begin with.
Threading
2l Make
sure
that
your
machine
is
threaded correctly. Breaking
thread,
skipping,
fraying
the thread,
and
tension
problems
will
occur
if
your
machine is threaded incorrectly.
Take
up
lever
3)
The
take
up
lever has
2
functions:
to
give
the thread enough slack so the
hook
can
carry
the
thread around the bobbin
case, and, after
the hook releases the thread, allows the
thread
to
pull
up into
the
leather.
Check spring
4) The
check spring maintains
tension on the
thread
as
the take up lever returns to the top
position.
Needles
5)
The needle
must be installed correctly. Make
sure
that the long
groove
is on the left,
and the scarf is
on the
right.
Needles
are tempered, so after usage, they
lose their temper and become weak.
A weak
needle
will bend or break easier after losing
its
temper.
When
the
needle
breaks,
it
could
cause damage to
the
presser
foot, needle
plate,
feed dog, or shuttle hook, so
make
sure
that
you
change
your
needle
every
12 hours
of
actual
sewing.
Also,
make sure that
you
use the
correct
size needle
for
the thread and thickness of
leather
that
you
are
using.
lf
you
are using
too
big of
a needle, then at
times,
the thread
will travel up
and down
inside
the
hole
that
the needle
punched
resembling
a tension

Leather Machine COBRA CLASS 3 Specifications