Mitsubishi LU2-410 Manual
MITSUBISHI
INDUSTRIAL
SEWING
MACHINE
TECHNICAL
INFORMATION
Model
LU2-410.
-430
Single,
Double-Needle
Lockstitch,
Compound
feed.
Automatic
Thread,
Variable
Speed
ET-0I9A
MITSUBISI
ELECTRIC
MITSUBISHI
CONTENTS
MACHINE
HEAD
CONSTRUCTION
SPECIFICATIONS
2
THREAD
TRIMMER
DIAGRAM
3
PREPARATIONS
FOR
OPERATION
4~5
1. POWER
CABLE
WIRING
4
2.
CONNECTION
WITH
CONTROL
BOX 5
3.
ADJUSTMENT
OF
NEEDLE
BAR
STOP
POSITION
5
NOTE
ON
USE 6 ~ 7
1.
OILING
(1) 6
2.
OILING
(2) 6
3.
LUBLICATION
CONDITION
7
4.
ADJUSTMENT
OF
LUBLICATION
TO
ROTATING
HOOK
7
5.
HANDLING
INSTRUCTIONS
7
HOW
TO
USE
THE
SEWING
MACHINE
8~17
1.
INSTALLATION
OF
NEEDLES
8
2.
WINDING
OF
BOBBIN
THREAD
8
3.
SELECTION
OF
THREAD
9
4.
THREADING
OF
NEEDLE
THREADS
9
5.
ADJUSTMENT
OF
STITCH
LENGTH
AND
REVERSE
SEWING (TOUCH BACK)
10
6.
SETTING
OF
BOBBIN
10
7.
WINDING
OF
BOBBIN
THREADS
1
8.
TENSION
ADJUSTMENT
OF
BOBBIN
THREADS
1
9.
BALANCE
OF
THREAD
TENSION
1
10.
TENSION
OF
NEEDLE
THREAD
1
11.
ADJUSTMENT
OF
PRESSER
FOOT
PRESSURE
1
12.
TIMING
ADJUSTMENT
FOR
ROTATING
HOOK
AND
NEEDLE
12
13.
ADJUSTMENT
OF
FEED
DOG
HEIGHT
13
14.
RELATION
BETWEEN
ROTATING
HOOK
AND
TAKE-UP
LEVER
14
15.
RELATION
BETWEEN
ROTATING
HOOK
AND
OPENER
MOTIONS
14
16.
RELATION
BETWEEN
NEEDLE
AND
FEED
DOG
MOTIONS
15
17.
SAFETY
CLUTCH
(SAFETY
DEVICE)
16
18.
ADJUSTMENT
OF
UPPER
FEED
(NEEDLE
SIDE)
STROKE
16
19.
ADJUSTMENT
OF
OUTER
AND
INNER
PRESSER
FOOT
17
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
ADJUSTMENT
OF
THREAD
TRIMMER
18~24
1.
INSTALLATION
OF
MOVABLE
KNIFE
18
2.
POSITIONING
OF
THREAD
TRIMMER
CAM
19
3.
ADJUSTMENT
OF
THREAD
TRIMMER
CAM
19
4.
ADJUSTMENT
OF
THREAD
TRIMMER
20
5.
ADJUSTMENT
OF
MOVABLE
AND
FIXED
KNIFE
MESHING
PRESSURE
21
6.
SHARPENING
THE
FIXED
KNIFE
.21
7.
ADJUSTMENT
OF
NEEDLE
GAUGE
DISTANCE
22
8.
INSTALLATION
OF
SOLENOID
CRANK
23
9.
REMOVAL
OF
HOOK
BRACKET
23
10.
FEED
DOG,
THROAT
PLATE,
HOOK,
BOBBIN CASE, BOBBIN,
AND
BED
SLIDE
23
11.
ADJUSTMENT
OF
NEEDLE
UP
STOP
POSITION
24
ADJUSTMENT
AND
APPLICATIONS
FOR
CONTROL
SYSTEM
25-27
1.
SELECTION
OF
POSITIONS
1
AND
2
25
2.
PEDAL
OPERATION
25
3.
ADJUSTMENT
OF
PEDAL
OPERATION
PRESSURE
25
4.
ADJUSTMENT
OF
RUNNING
SPEED
25
5.
OPTIONAL
FUNCTIONS
26-27
THREAD
TRIMMER
TROUBLESHOOTING
LIST
28-29
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
1.
Take-up
lever
2.
Crank
3.
Needle
thread
tension
regulator
4.
Eccentric
ring
5.
Crank
rod
6.
Oil
tank
7.
Pressure
adjusting
screw
8.
Needle
bar
rock
shaft
9.
Thread
retainer
10.
Arm
shaft
11.
Timing
belt
pulley
(upper)
12.
Timing
belt
13.
Balance
wheel
14.
Synchronizer
15.
Arm
16.
Needle
bar
rock
link
17.
Reverse-stitch
lever
18.
Stitch
length
adjusting
dial
19.
Reverse-stitch
solenoid
20.
Feed
shaft
crank
(right)
21.
Timing
belt
pulley
(lower)
22.
Lubricator
23.
Feed
shaft
crank
(intermedi
ate)
24.
Feed
lifting
rod
25.
Filter
26.
Feed
rock
cam
27.
Hook
shaft
28.
Feed
rock
shaft
29.
Thread
timmer
solenoid
30.
Thread
trimmer
cam
31.
Touch-back
switch
(pushbutton)
32.
Feed
bar
33.
Movable
knife
34.
Fixed
knife
35.
Hook
36.
Hook
bracket
37.
Fixed
knife
bracket
38.
Opener
39.
Bed
40.
Pressure
bar
41.
Rock
pressure
bar
42.
Needle
bar
43.
Face
plate
44.
Needle
bar
clamp
45.
Needle
bar
support
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
SPECIFICATIONS
Specifications
of
LU2-410-B1T
and
LU2-430-B1T
Model
Specifications
LU2-410-B1T
LU2-430-B1T
Application
Heavy
materials
Max.
stitching
speed
2000
SPM
Stitch
length
0
to
9
mm
Needle
bar
stroke
36.0
mm
Pressure
foot
stroke
Knee
lifter
—
16
mm,
hand
lever —8
mm
Needle
DP
X
17
#20
to
#23
Rotating
hook
(for
thread
trimming)
Fully
rotating,
automatically
lubricated
horizontal
type
hook
equipped
with
bobbin
slys
running
prevention
spring
Fully
rotating,
automatically
lubricated
horizontal
type
hook
equipped
with
idle
running
prevention
spring
Alternate
up/down
stroke
2
to
6
mm
Bobbin
Aluminum
bobbin
for
thread
trimming
Thread
trimming
method
Horizontal
combination
of
fixed
and
movable
knives
Lubrication
Automatic
Lubrication
Automatic
back-tack
Touch
back
leven
system
Bed
size
512
X
178
mm
Note: Use feed dog,
throat
plate,
rotating
hook,
bobbin
case,
bobbin,
and
bed slide which
are
specifically
utilized
for
thread
trimming.
Use
high-quality
bobbin
which
is
not
deformed.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
THREAD
TRIMMER
DIAGRAM
@
e>
Af(gl.A-rnAiLr.i
Part
Names
1.
Machine
head
6.
Thread
trimmer
solenoid
11.
Synchronizer
cord
plug
2.
Touch
switch
7.
Motor
12.
Pedal
3.
Reverse-stitch
control
8.
Drive
pulley
13.
Operation
box
solenoid
9.
Control
box
14.
Power
pushbutton
switch
4.
Balance
wheel
10.
Machine
control
cord
15.
Phase reversing
plug
5.
Synchronizer
plug
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
PREPARATIONS
FOR
OPERATION
Machine
Configuration
Face plate
Touch-back
switch'
Phase
reversing
plug
^
Ztype
LIMI-STOP
Control
txDx
1.
POWER
CABLE
WIRING
Balance
wheel
/
Synchronizer
Receptacles
for
machine
cables
Rubber
cushion
IPower
pushbutton
switch
Solenoid
box
(option)
With
this
opetional
solenoid
box,
additional
functions,
such
as
automatic
back
tack,
can
be
used.
1.1
Connectors
Before
connecting
connectors
with
the
control
box,
be
sure
to
check
the
shapes
of
matching
connectors
and
their
inserting
directions.
1.2
Lamp
Leads
(1)
Lamp
leads
are
provided
at
the
back
of
motor
for
fitting
a
work
lamp
to
the
machine.
To
fit
the
lamp,
remove
the
insulation
tape
and
insulator
properly
from
the
lamp
leads.
Then,
connect
them
to
lamp
wires.
After
connection,
be
sure
to
protect
connected
wires
with
insulation
tape.
w•
li
{2}
Use
6
V,
15-20
W
lamp.
nilfc
(3)
When
lamp
is
not
used,
properly
JK'.j-
s-,
insulate
2
lamp
leads.
1.3
Power
Cable
Connection
u
Cable
connection
for
power
supply
is
the
same
as
that
for
the
standard
clutch
motor.
(1) In
the
case
of
a
3-phase
motor,
connect
U
phase
to
red
lead,
V
phase
to
white
^
lead,
and
W
phase
to
black
lead.
Be
sure
k
'$
I
to
ground
green
lead
by
connecting
it
JUBf
(2)
Power
fuse
capacity
for
3-phase
motor
|
mniii
is 10 A;
that
for
single-phase
motor
is
15
A.
(3)
Control
box
fuse
capacity
is 8 A.
1.4
Motor
Rotating
Direction
To
reverse
the direction of motor rotation, disconnect the phase reversing plug from the
motor end cover, turn It 180°, and then plug it into the end cover. In the case of a
single-
phase motor, turn on the switch after the motor is brought
to
acomplete stop (approx
imately 2minutes). Also, be sure
to
fully insert
the
plug.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
2.
CONNECTION
WITH
CONTROL
BOX
Round
hole
in
table
Wire
the
control
box
as
shown
at
right.
Solenoid
box
Note: (1)
For
the
sake
of
safety,
before
connecting
or
disconnecting
connectors,
be
sure
to
turn
off
the
power
switch.
(2)The
combination
of
machine
head
and
motor
control
box
is
as
specified
below.
Keep
in
mind
correct
combination
when
replacing
the
machine
head
or
control
box.
Machine
head
Control
box
LU2-410Binn
LE.MD-120
LU2-430BinD
LE-MD-120
3.
ADJUSTMENT
OF
NEEDLE
BAR
STOP
POSITION
Clutch
Brake
External
volume
Position
1/2
select
switch
When
the
pedal is kicked down by heel and thread trimming is completed, the machine stops
with
the
timing mark
"B"
matching with
the
white timing mark "C". The needle bar stop
position of all sewing machines are factory-adjusted. However, if
the
timing marks are
out
of
alignment more than 3 mm, adjust the setting position of light shielding disc in the following
procedure:
[Preparation]
1)
Disconnect
the
plug
(12
pins)
of
cable,
which
comes
out
of
the
machine
head,
from
the
control
box.
2) Remove
the
synchronizer
cover.
3) Run
the
machine
and
stop
with
the
needle
at
UP
position.
After
the
com
pletion
of
preparation,
start
the
follow
ing
adjustment:
[Adjustment]
1) While holding
the
light shielding disc by
hand,
turn
the
balance
wheel
until
the
timing
marks
"B"
and
"C"
are
aligned.
2)
Repeat
pedal
operation
(toe
down
and
heel
down)
several
times
to
make
sure
the
needle
always
stops
exactly
at
the
specified
position.
3)
Then,
set
the
plug
(12
pins), which
comes
from
the
machine
head,
into
the
receptacle.
Whitetiming
mark
Light shielding disc
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
NOTE
ON
USE
1.
OILING
(1)
Fill
the
oil
reservoir
with
oil
up
to
the
"H"
mark.
Oil level
should
be
periodically
checked.
When
oil
level
is
lower
than
the
"L"
level,
replenish
the
reservoir
with
oil
to
the
"H"
level. Use
white
spindle
oil
speci
fied
by
Mitsubishi.
Oil
level
5
2.
OILING
(2)
When a
new
sewing
machine
is used
for
the
first
time
or
a
sewing
machine
shelved
for
a
long
time
is
used
again,
apply
required
amount
of
oil
to
portions
indicated
by
arrows
in
the
figure
below.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
3.
LUBRICATING
CONDITION
Check
lubricating
condition
during
machi
ne
running
by
viewing
oil
drips
through
the
oil
sight
port.
I
(Motor
maintenance)
Remove
dust
from
the
motor
filter
every
two
or
three
months.
(Continued
operation
with
lint-
or
dust-clogged
filter
will
cause
the
motor
to
overheat,
thereby
reducing
motor
service life.)
5.
HANDLING
INSTRUCTIONS
4.
ADJUSTMENT
OF
LUBRICATION
TO
ROTATING
HOOK
I
[ncrease
Decrease
^
Adjust
screw
Dustproof
filter
(1) When
the
power
is
turned
on
or
off,
keep
foot
away
from
the
pedal.
(2)
Note
that
the
machine
may
not
be
braked
when
the
power
is
turned
off
or
when
power
failure
occurs
during
operation.
(3) Be
sure
to
close
the
control
box
cover
during
sewing
operation.
Otherwise,
dust
will
enter
the
control
box,
resulting in
malfunction
and
trouble.
(4) Do
not
apply
a
multimeter
to
the
control
circuits.
Voltage
from
the
multimeter
may
damage
semiconductor
parts.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
HOW
TO
USE
THE
SEV\/ING
MACHINE
1.
INSTALLATIONOF
NEEDLES
Note:
Install
needles
after
turning
off
the
power.
1
Needle
Needles
are
not
fully
Put
each
needle
into
needle
socket
until it
stops
at
the
bottom
of
needle
Needles «
socket
and
turn
2
needles
so
that
their
inserted.
prime
grooves
face
each
other.
Then
tighten
set
screws.
Needles
are
set
in
wrong
direction.
O
.
Position
needles
with
their
prime
grooves
facing
each
other.
XX
2.
WINDING
OF
BOBBIN
THREAD
[Adjustment]
Tension
of
wound
thread:
Slack winding is
recommended
for
polyester
and
nylon
threads.
Conically
wound
thread:
Move
the
thread
guide
toward
smaller
diameter
of
wound
thread
layer.
Quantity
of
wound
thread:
Loosen
the
thread
quantity
adjusting screw
to
increase,
and
tighten
to
decrease,
the
quantity
of
wound
thread.
Thread
tension
adjust
nut
Thread
length
adjut
screw
Note:
When
operating
under
no
load,
keep
the
presser
foot
lifted.
Thread
guide
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
3.
SELECTION
OF
THREAD
It is
recommended
to
use
"8"
twist
thread
for
the
left
needle
(viewed
from
front)
and
"Z"
twist
thread
for
the
right
needle.
When
it is
difficult
to
use
threads
depending
on
needles, use
"Z"
twist
thread
for
both
needles.
For
bobbin thread,-
either
thread
will
do.
4.
THREADING
OF
NEEDLE
THREADS
(1) Pass each needle thread through thread guide
"A".
Note: When
thin
slippery
thread
(such as polyester
or
filament thread) is used, pass
the
thread
through
thread
guide
"B"
and
then
"A".
(2) With
the
take-up lever located at
the
uppermost
position,
pass
each
needle
thread
in
the
order
shown
in
the
figure
below.
Note: Pressing
the
needle
thread
tension
regulator
button
(shown in figure below) will
open
the
tension
disc,
thereby
allowing
the
needle
thread
to
be
picked up easily.
Needle thread tension regulator
button
(HD®®
llMCiiD
®(0
(Expanded
view)
Thread
Lead
thread
Lead
thread
leftward. rightward.
. S
twist
thread
"Z"
twist
thread
A B
ABA
iijLd
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
5.
ADJUSTMENT
OF
STITCH
LENGTH
AND
REVERSE
SEWING
(TOUCH
BACK)
To
make
stitch
length smaller, lower
the
stitch length adjust lever
and
turn
the
stitch
length
adjust
dial.
Stitch
length
adjust
dial
Stitch
length
adjust
lever
6.
SETTING
OF
BOBBIN
(1)
Mount
bobbin
thread
into
bobbin
case
so
that
the
thread
is
wound
clockwise.
(2)
Then
pass
the
thread
through
the
slit
"1"
and
pull.
The
thread
passes
under
the
tension
spring
and
comes
out
of
the
slit
"2".
*When
the
bobbin
thread
is
pulled,
the
bobbin
should
rotate
in
the
direction
indicated
by
arrow
in
the
figure.
10
Touch-back
switch
.... Direction
of
stitching
can
be reversed
by pressing
this
switch.
Stitching
goes
on
in
reverse
direction
while
the
button
is pressed,
and
*returns in forward
direction
when
the
button
is
released.
S
It
"2
Slit
"1
I
^
Touch-back
* switch
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
7.
THREADING
OF
BOBBIN
THREADS
(1)
Mount
the
bobbin
case
in
the
hook
and
set
the
latch
"1".
Keep
thread
end
over
the
bed.
Thread
Thread
Opener
—
(2) Pick up 2 needle
threads
by
left
hand
and
rotate
the
balance
wheel
1
turn
by
right
hand.
By pulling up
the
needle
threads
as
shown
in
the
figure,
the
bobbin
threads
are
lifted.
Both
bobbin
and
needle
threads
should
be
aligned
and
led
backward.
8.
TENSION
ADJUSTMENT
OF
BOBBIN
THREADS
Loosen
Tension
adjust
screw
Tighten
11
9.
BALANCE
OF
THREAD
TENSION
AO
BX
CX
Balanced
tension
Tight
needle
or
loose
bobbin
thread
tension
Loose
needle
or
tight
bobbin
thread
tension
10.
TENSION
OF
NEEDLE
THREAD
Needle
thread
tension
should
be
adjusted
with
respect
to
bobbin
thread
tension.
To
adjust
needle
thread
tension,
turn
each
tension
adjusting
nut.
Also
adjust
needle
thread
tension
for
special
fabric
and
thread
by
changing
force
and
stroke
of
slack
thread
take-up
spring.
Loosen^^^S
Tighten
Thread
tension
adjust
nut
11.
ADJUSTMENT
OF
PRESSER
FOOT
PRESSURE
Adjust
pressure
depending
on
fabrics
by
turning
the
pressure
adjusting
screw.
.
Pressure
adjust
screw
00
r»
A
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
12.
TIMING
ADJUSTMENT
FOR
ROTATING
HOOK
AND
NEEDLE
(1)
Set
stitch
length adjusting dial
to
"6".
(2) When
the
needle is lifted
2.4
mm
from
its
lowermost
position,
the
rotating
hook
and
the
needle
should
be
located
at
the
following
locations:
The
upper
edge
of
needle
eye
should
be
2.3
mm
below
the
hook
point.
The
hook
point
should
be
located
at
the
center
of
needle
axis.
Gap
between
the
hook
point
and
the
side
face
of
needle
should
be
0.05
mm.
(3) Needle
and
rotating
hook
positions
can
be
adjusted
in
the
following
procedure:
*Easy
adjustment
can
be
made
by
remov
ing
the
presser
foot,
throat
plate,
and
feed
dog
before
adjutment.
Positioning
the
hook
point
(1)
With
the
needle
at
lowermost
position,
mesh
the
right
hand
driving gear (small)
with
the
large
gear
so
that
"8"
screw
is
located
at
front,
and
mesh
the
left
hand
driving
gear
(small) so
that
"8"
screw
is
located
at
rear.
(2)
Tighten
"8"
screws
onto
the
set
contact
of
hook
shaft.
(3)
Guide
of
rotating
hook
position
When
the
needle
is
at
its
lowermost
position,
the
"C"
screw
in
rotating
hook
is
nearly
in
line
with
the
needle.
*
To
make
fine
adjustment
of
hook
and
needle
motions,
loosen
screw
in
driving
gear (large)
and
move
the
driving gear
(large) 1
to
2 mm in
the
axial
direction.
12
2.3
mm
Hook
pointNy
l
Upperedge
of^
needle
eye
Needle
lifted
' i n
2.4
mm | l
Needle
at
lowest
position
0.05
mm
Center of €
needle
Hook
point
) 5
r(
X
X
X
X
X
X
1
to
2
mm
Needle
at
lowest
position
1
to
2
mm
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
13.
ADJUSTMENT
OF
FEED
DOG
HEIGHT
The
height
of
feed
dog
and
the
pressure
of
presser
foot
should
be
adjusted
depending
on
fabrics.
Light
fabric
will be
damaged
if
the
feed
dog
position
is
too
high
or
the
presser
foot
pre
ssure
is
too
strong.
The
stitch
length
of
heavy fabric will
not
be
uniform
if
the
feed
dog
position
is
too
low
or
the
presser
foot
pressure
is
too
weak.
Measure
the
height
of
feed
dog
by
turning
the
balance
wheel
by
hand
and
locating
the
feed dog
at
the
highest position from
the
throat
plate.
Light
fabric
Approx.
0.8
mm
above
throat
plate
Normal
fabric
...
.Approx.
1.0
mm
above
throat
plate
Heavy
fabric
Approx.
1.2
mm
above
throat
plate
Adjusting
Procedure
(1)
Lean
the
machine
head
backward.
(2)
Turn
the
balance
wheel
by
hand
and
stop
it
when
the
feed
dog rises
to
the
maxi
mum
height
above
the
throat
plate.
(3)
Loosen
the
feed
bar
set
screw.
(4) Vertically move
the
feed bar (in
the
direction indicated by
arrow
in
the
figure)
to
locate
the
feed dog
at
proper
height.
(5)
After
height
adjustment,
tighten
the
feed
bar
set
screw.
The
feed
dog
height is
factory-set
at
1.2
mm.
13
;0.8
mm
mm
T~
V///.
screw
Feed
bar
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
14.
RELATION
BETWEEN
ROTATING
HOOK
AND
TAKE-UP
LEVER
MOTIONS
When
the
timing belt is removed for replacement,
the
relation
between
rotating
hook
and
take-up
lever
motions
should
be
as
follows:
(1) Turn the balance wheel and stop it when the
take-up lever is lifted
to
its
top
position.
(2) Lean
the
machine head backward and make
sure
the
arrow
(timing mark)
on
the
timing
belt sprocket matches
the
black line on
the
boss
of
hook
shaft
bearing.
(3) If
the
timing mark is
not
aligned with the
black line, remove
and
reinstall
the
timing
belt
to
obtain
proper
alignment.
Timing
belt
Black
line
Timing
mark
(arrow)
Timing belt
sprocket
15.
RELATION
BETWEEN
ROTATING
HOOK
AND
OPENER
MOTIONS
(1)
Turn
the
balance wheel by
hand
and
stop
it
when
the
opener
holder
is
the
longest
distance
away
from
the
throat
plate.
(2)
At
this
time,
make
sure
that
the
gap
between
the
bobbin
case
holder
"A"
and
the
opener
is
approximately
0.2
mm.
(3) If
the
gap is
too
large
or
small, loosen
the
opener
set
screw
"B"
and
adjust
the
position
of
opener.
14
Approx.
0.2
mm
Opener
Screw
"B'
Opener
holder
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
16.
RELATION
BETWEEN
NEEDLE
AND
FEED
DOG
MOTIONS
Feed
shaft
crank
(intermediate)
Feed
shaft
crank (right)
Screw
"A"
(1)
Set
the
stitch length adjust dial
to
"0".
(2)
Lean
the
machine
head
backward.
(3) Loosen
the
feed
shaft
crank
set
screws
"A"
and
"B".
(4) Lower
the
needle
to
its lowest
position.
(5) Allow 9-mm gap between
the
pressure bar
and
the
rock
pressure bar (10.1 mm
for
LU2-400
and
420).
Then
finger-tighten
the
feed
shaft
crank
xrews
"A"
and
"B".
(6) Check
to
see if
the
right feed
shaft
crank
is
connected
with
the
link at right angles
as
shown
in
the
figure.
(7) If
the
connection
is
not
at right angles,
remove
the
back
cover
and
loosen
"C"
screw
to
obtain
the
right angles.
(8) After
the
completion of adjustment, fully
tighten
the
screws
"A",
"B",
and
"C".
Screw
"B
Link
-
Needle
bar
Rock
pressure
bar
Link
Feed
shaft
crank
(right)
Screw
"8
Dimension
A
LU2-410and
430
9.0
mm
LU2-400
and
420
10.1
mm
15
Screw
"C
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
17.
SAFETY
CLUTCH
(SAFETY
DEVICE)
The
safety
clutch
prevents
hook
and
timing
belt
from
being damaged
when
the
machine
runs
under
excessive
load
which
is
caused
by
the
hook
caught
in
threads.
(1)
Function
1)
When
the
safety
clutch
is
actuated,
timing belt pulley races, causing
the
hook
shaft
to
stop
and
only
the
arm
shaft
to
keep
turning.
Therefore,
immediately
stop
the
machine.
2)
Remove
threads
and
other
foreign
matter
from
the
hook.
3)
Turn
the
timing
belt
pulley
bushing
by
hand
to
check
for
smooth
rotation
of
hook
shaft.
Then
set
the
clutch
mecha
nism
back
again.
(2)
Setting
Procedure
1)
While
simultaneously
pressing
the
push
button,
which
is
located
on
the
other
side
of
bed,
by
left
hand,
slowly
turn
the
balance
wheel
by
right
hand
in
the
direc
tion
shown
by
arrow
in
the
figure.
2)
Now
the
balance
wheel
is
stopped
by
the
intermeshing
plate
provided
in
the
clutch
mechanism.
Then
turn
the
balance
wheel
again
with
further
greater
force.
3) Release
the
pushbutton
which
has
been
kept
pressed.
4)
The
clutch
mechanism
is
now
set
as
shown
in
the
figure.
18.
ADJUSTMENT
OF
UPPER
FEED
(NEEDLE
SIDE)
STROKE
When
stitching
is
not
made
uniformly
depending
on
fabrics,
adjust
the
upper
feed
stroke
by
range
of
slot
in feed
rock
shaft
crank
(right).
[Adjusting Procedure]
1)
Loosen
the
special
bolt.
2) When
this
bolt
is
set
at
upper
position,
the
upper
feed
stroke
increases.
3) When
this
bolt
is
set
at
lower
position,
stroke
decreases.
(The
upper
and
lower
feeds
are
theoretically
equivalent
at
the
point
where
the
reference
line
for
feed
rock
shaft
crank
is
aligned
with
the
center
of
special
bolt.)
4)
After
adjustment,
tighten
the
special
bolt.
16
Safety
switch
Timing belt pulley
Bushing
Balance
wheel
Pushbutton
joint
portion
Pushbutton
Intermeshing
plate
F^ed rockshaft crank (right)
Upper
feed
stroke
[(needle bar rock link)
Upper
feed
stroke
Reference
Special
bolt.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
19.
ADJUSTMENT
OF
OUTER
AND
INNER
PRESSER
FEET
(1)
Operating
Height
Adjustment
When springy material is sewn
or
when
the
thickness
changes
greatly,
adjust
the
operating
height
of
presser
foot.
[Adjusting Procedure]
1) Loosen
the
special
bolt.
2)
Setting
the
crank
rod
special
bolt
at
upper
position
increases
the
operating
height
of
inner
and
outer
presser feet.
3)
Setting
the
bolt
at
lower
position
decreases
the
height.
4)
After
adjustment,
tighten
the
special
bolt.
The
height
of
presser
feet
is
adjustable
between
2
mm
and
6
mm.
(2)
Alternate
Up/Down
Strokes
The
best
feed
condition
can
be
obtained
by
changing
the
alternate
up/down
strokes of
outer
and
inner
presser
feet
depending
on
fabrics.
Example:
When
slippery
fabric
is
sewn,
reduce
vertical
stroke
of
outer
presser
foot
and
increase
that
of
inner
presser
foot.
This
prevents
slipping.
[Adjusting Procedure]
1)
Turn
the
balance
wheel
and
stop
it
when
the
take-up
lever
reaches
its
lowest
position.
Lower
the
presser
bar
lifter.
Loosen
the
screw
"A"
in
the
upper
feed
lifting
rock
shaft
crank.
Moving
the
crank
"B"
to
the
left
increases
the
vertical
stroke
of
inner
presser
foot
and decreases
that
of
outer
presser
foot.
Reversely, moving it
to
the
right
reduces
the
vertical
motion
of
inner
presser
and
increases
that
of
outer
presser.
After
adjustment,
securely
tighten
the
screw
"A".
(Vertical
stroke
of
inner
presser
foot
is
factory-set
at
2
mm
and
that
of
outer
at
3.2
mm.)
2)
3)
4)
5)
6)
(3)
Mounting
the
Eccentric
Ring
1)
Turn
the
balance
wheel
by
hand
to
bring
the
needle
bar
at
the
highest
position.
2) In
this
state,
locate
No. 1
screw
"C"
in
eccentric
ring as
shown
in
the
figure
and
tighten
it.
17
Upper feed lifting rock shaft crank
Special
bolt/O
Screw
"A
Lower
Arm
"B
Crank
rod
Uniform
Uniform
vertical
motion
(Higher)
Inner
presser
foot
Outer
presser
foot
Non-uniform
vertical
motion
(Lower)
Eccentric
ring
No.
1
screw
"O
No.
2
screw
Arm
"8'
\
b)—
Upper feed lifting
Crank
rodshaft
crank
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
This manual suits for next models
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