Before leaving the factory, the machine parts are coated with rust-preventive grease,
hardened and contaminated
2) Examination
Though every machine is confirmed by strict inspection and test before leaving
parts may be loose
performed after cleaning the machine. Turn the balance wheel to see
collision, uneven resistance or abnormal noise.
operation.
3) Oiling
(I)
Required amount
Line (
A)
Line ( B ) on the oil reservoir: Min. oil level.
lf
oil level goes down under line ( B ),
oil cannot be distributed to each
thus causing the parts a seizure.
(2) Replenishing
Always use only
for
high speed sewing.
Line ( A ) before starting operation.
(3) Replacing oil
To
replace oil,
securely tighten Screw ( C ), then fill the reservoir with fresh oil.
or
on the oil reservoir: Max. oil level.
remove
AND
by
deformed after long distance transportation with jolt. A thorough examination must be
of
oil.
No.l8
special machine oil
Be
sure to replenish oil
LUBRICATION (
dust during storage and shipment. This grease
If
these exist, adjustment
part
of
the machine,
Fig.3)
must
A B
to
must
be removed with gasoline.
if
there is running obstruction, parts
be
made
Fig.3
Screw
( C ) to drain oil. After completely draining
off
oil, clean the oil reservoir and
which
the
factory, the machine
accordingly before run-in
may be
c
5.
REPLACE NEEDLES (
Tum the balance wheel
While keeping the long
socket Then tighten Needle Clamp Screw
Note Fig. ( b
Fig.
):
insufficient
(c):
\vrong direction
to
groove
Long groove
Fig.4)
lift needle
of
the
needle leftward fully insert the needle shank
in~ertion.
oflong
bar
to the upper end
A.
groove.
of
its stroke. Loosen Needle Clamp Screw
up
to
the
bottom
of
the needle
Fig.4
1.
-3-
6.
NEEDLE,
THREAD
AND MATERIAL
TO
BE SEWN
Needle Size
No.l4
No.l6
No.22 Medium leather, Canvas
7.
RUN-IN
Run-in operation is required for a new sewing machine, or a sewing machine left out operation for a
considerable length
1)
Remove Red Rubber Plugs
2)
Lift Presser Foot ( B
3)
Run the machine
Window
4) Perform run-in operation at 2000-2500spm for 30minutes. After a lapse
which the working speed is increased gradually and the machine runs sufficiently well, the high speed
can be adopted according
OPERATION
of
(C).
time.
).
at
a low speed ( 2000-2500spm) to check oil distributing condition through Oil Check
thread the needle thread, raise needle bar to the upper end
perform threading
balance wheel
bobbin thread is drawn
as
to
lower the needle bar and then to lift it
Fig.6)
shown in Fig.6 .
up.
Put the ends
of
its stroke, lead the thread from spool and
To
dra\V
the bobbin thread, hold the end
to
its
highest position. Pull the needle thread and the
of
needle thread and bobbin thread frontward under presser foot.
of
the needle thread and turn the
'.
6
;lg.
l
-5-
9.
WINDING ADJUSTMENT (
1)
The wound bobbin thread should be neat and tight,
Stud Nut
deform.
Screw
shown in
leftward.
3)
adjusted
(A)
of
bobbin winder tension bracket.
Note: nylon or polyester thread should be wound with little tension, otherwise, Bobbin ( D ) might break or
2)
When the wound thread layer does not present a cylindrical shape as shown
( B )
of
bobbin winder tension bracket and slide Bracket ( C ) leftward or rightward.
Fig.
7 ( b
),
move the bracket rightward, but
After adequately positioning the bracket, tighten
Do
not overfill the bobbin. The optimum length
by
Adjusting Screw
(E)
of
bobbin winder stop latch.
Fig.7)
if
Set Screw
of
if
not, adjust the winding tension by turning Tension
thread is wound
(B).
thread will fill about 80%
as
shown in Fig. 7
in
Fig.7 (
(c),
of
bobbin capacity. This can be
a),
If
thread
is
move the bracket
loosen Set
wound
as
~
~
-
a
b
Fig.
-6-
c
7
m
d
10.
SET
2) The figures on Face ( B )
3) Reverse feeding starts
again
STITCH
1)
Stitch length can
if
Reverse Feed lever
LENGTH
be
set
by
turning
of
dial
when
(C)
is released.
~--------------------------~
AND REVERSE
Dial ( A).
show
stitch length
Reverse Feed Lever ( C ) is depressed,
FEEDING
in
nnn
( Fig.S)
and
the machine will feed forward
Fig.8
11.POSITION
1)
Loosen lock
2) Remove rubber plug from
3) Loosen Screw ( C ) and adjust the position
throat plate will the presser foot lifted to its highest.
4) Tighten
5) Tighten pressure Regulating Thumb
PRESSER
Nut ( E)
Screw
(C)
BAR ( Fig.9)
and Pressure Regulating Thumb Screw
Face
Plate ( B
and
put
in
the rubber plug.
Screw
).
of
(A)
Presser
and Lock
(A).
Bar
( D ) till the presser foot is 6
Nut
(E).
mm
above the
Fig.9
-7-
12.
ADJUST
THE
PRESSURE
OF
PRESSER
EOOT
(
Fig.lO)
Pressure
First loosen Lock Nut ( A
Fig.!
0 (
in Fig.l 0 ( b )
The pressure
of
presser foot is to be adjust in accordance with thickness
a)
to
increase the pressure, while for light materials, turn the pressure regulating thumb screw
to
decrease the pressure. Then tighten Lock Nut
of
presser foot is recommended to
of
materials to be sewn.
).
For heavy materials, turn the pressure regulating thumb screw as shown in
as
shovvn
(A).
be
a
less as long as normal feeding
b
is
ensured.
Fig.
10
13.
ADJUST THREAD TENSION ( Fig.11,12)
In
principle, thread tension is to be adjusted in accordance with materials, thread and other factors.
In
practice, thread tension
be adjusted
case clockwise for more tension, or tum the screw counter-clockwise for less tension.
the thread from delivery eye.
thread tension can
and ( 3 ) tension spring. All these adjustments will be described in the following .
with reference to the bobbin thread tension. Tum Tension Spring Regulating Screw (
It
is
common practice to test the bobbin test the bobbin thread tension as shown in
be
adjusted by setting ( 1 ) the take-up spring tension. ( 2 ) the thread take-up spring stroke
is
adjusted according to the stitches obtained. The needle thread tension should
If
the bobbin case is falling slowly, the proper tension is obtained. The needle
.-------~~------------------~
/
Fig.l2
A)
of
bobbin
. Hold the end
of
Fig.
11
--8-
Fig.
12
14.
AD.JUST THREAD TAKE-UP SPRING (
1)
Adjusting the thread take-up spring tension
Loosen Set Screw ( A ), turn Tension Stud ( B ) clockwise to increase the spring tension, or turn the stud
counter-clockwise
thread take-up spring tension should
( B ) counter-clockwise
( B ) clockwise until Spring (
Stud ( B ) halfway back ( counterclockwise ) After
to
decrease the spring tension. After the adjustment, be sure to tighten Set Screw (
be
about 30g.
to
decrease the tension
C ) comes
to
the notch
To
Attain this. First loosen Set Screw
of
Thread Take-up Spring ( C ) to zero, then tum Tension Stud
of
thread tension regulating bushing, and again turn Tension
the
adjustment. Tighten Set Screw
Fig.l3,14)
(A).
(A),
turn Tension Stud
A).
The
2)
Adjusting the thread take-up spring stroke
Loosen Set Screw ( B
counter-clockwise
Before leaving the factory, the thread take-up spring has properly been adjusted. Readjustment is needed
in
only
the case
to
decrease the stroke. After the adjustment, tighten Set Screw
of
special material or special thread .
.-----~-------------------------------,
Fig.
13
),
turn Stud ( C ) clockwise to increase the stroke or turn Stud ( C )
(B).
.-----------\
A
Fig.
14
--9-
15.
ADJUST THREAD GUIDE AND THREAD TENSION (
Fig.15,16)
The position
materials and sewing conditions.
Thread guide position Leftward Center Rightward
Material weight
Fig
15
shows different stitch fonns. Normal stitch fonn should be as
shmvn in
and thread break-age, the tension
thread must
l)
the thumb nut counterclockwise to decrease the needle thread tension,
screw
2)
the thumb nut clockwise to increase the needle thread tension, or loosen the tension spring regulating screw
bobbin case
3)
above means.
Fig.
In
case needle thread tension is too strong or bobbin thread tension is too weak, as shown in
of
bobbin case
In
case needle thread tension is too weak or bobbin thread tension is too strong, as shown in Fig.
In
case
of
of
the thread guide affects stitch tightness and therefore must be adjusted according to sewing
1 2 3
Heavy Medium Light
IS
( a
).
When abnormal stitches cause puckering
of
needle thread and bobbin
be
adjusted accordingly.
to
increase the bobbin thread tension ( Sec Fig.16 )
to
decrease the bobbin thread tension.
the stitch forms
as
shown in Fig.
IS
Fig.
15
or
tighten the tension spring regulating
(
d)
and ( e ), adjustments can be made with reference
Fig.l5
IS
( b ), tum
( c ), turn
to
a
b
c
d
e
of
the
•
Fig.
16
-IO-
16. TIME NEEDLE TO ROTAING HOOK ( Fig.17,18,19,20)
A. Adjusting the needle position
I) Turn balance wheel by hand to bring Needle Bar ( C ) to the lowest position
2) Remove rubber plug from Face
3) Loosen Set Screw
4)
Move
Needle
5) After the adjustment, tighten Set Screw ( B ) and put in the rubber plug. The standard needle timing ( See
Fig.l8 ) is
meanwhile align the Inner Surface (
down to its lowest position.
to align Timing
Bar
(B)
(C)
(See
Fig.l7)
Plate
(A).
of
needle bar adaptor.
vertically to adjust needle timing.
Mark
( B )
on
the needle bar and the bottom
E )
of
the hook and the center
of
its stroke.
of
Needle Bar Bushing ( A ) and
of
Needle Eye ( D ) when the needle bar gets
Fig.
17
B.
Adjusting the hook point timing
of
Timing
hook point timing ( See
is
lifted by 2.2mm from the lower end
upper end
When adjusting the hook point timing, also notice that the clearance between the bottom
and Hook
needle motion to rotating hook motion has a great effect on sewing performance. The standard
Fig.l9
) is to align Hook Point ( D ) and Needle Centerline ( C ) when Needle Bar ( B )
of
its stroke. Besides, Hook Point ( D ) should be
of
needle eye ( E
Point
(C)
).
should be approK 0.05mm ( See
Fig.20)
Fig.
18
0.05mm
1.0-l.Smm
of
needle notch
above the
Pi
g.
19
-
11-
Fig.20
17. REPLACE ROTATING
HOOK
( Fig.21 )
l ) Lift needle bar to the highest position
2) Remove throat plate, take down needle and bobbin case.
Loos.en
3)
4) Loosen two Screws ( D )
5) Tum balance wheel to raise feed
avvay
6) Installing the hook can be done in reverse sequence. Note that Needle ( B ) and the convex surface
Hook Positioner
Screw ( C )
from feed bar.
(A)
of
hook positioner and take down Hook Positioner
of
rotating hook.
should align with a clearance
of
its stroke.
(A).
bar
to
its highest position, then take down the rotating hook by turning it
of
0.5-0. 7mm between them.
0.
5-0.
7mm
of
18. AD.JUST THE HEIGHT OF FEED
1 ) Tum balance wheel until feed dog
(A)
of
2) Loosen Screw
3) Move Feed Bar
dog.
The standard height
4) After the adjustment, be sure to tighten Screw
feed lifting rock shaft crank right ( Sec Fig.22,b )
(B)
in the direction shown
of
is
feed dog
lifted to its highest position from throat plate surface.
by
is
that the top
(A).
a b
Fig.22
Fig.
21
DOG
the arrow in Fig. 22
( Fig.22,23 )
(a)
to adjust the height
of
feed dog is 1 mm above Throat Plate Surface ( B )
w~-:
Vig.23
of
the feed
1.
Ornm
-12-
19.
ADJUST THE POSITION OF FEED
DOG ( Fig.24,25)
The standard position
first tooth
I) Fully advance the feed dog tovvard the front end
2) Loosen Feed Rock
3) Move Feed Bar
4) After the adjustment, be sure to tighten
of
the fully advanced feed dog
of
feed dog is that the clearance behveen the front
Shaft Crank Screw
(B)
in the direction
Fig.
24
is 1 nm1,
(A).
shovvn
Screw
as shown in
of
the throat plate slot.
See Fig.25
by
the arrow in Fig.
(A).
Fig.24.
(b).
25
(a)
end
of
the throat plate slot and the
to
adjust the feed dog position.
b
Fig.
25
20. TIME FEED lVIOTION TO NEEDLE MOTION (
The standard timing
Plate Surface
I r
I J
2)
3)
(B)
feed
motion IS not timed to needle motion, adjust
RcmO\ c i\rm
Loosen Set Screws
Hold
feed and Feed Lifting Eccentric
.-\rm
Shan
ccccntnc
Oil Hole ( C ) aligns with the lower edge
of
feed motion to needle motion
when the point
Fig.
Side Cover .
(A
) and ( D )
of
26
Needle
of
is
that the top
(A)
reaches Throat Plate Surface
as
follows ( Sec Figs.27 and 28
feed and feed lifting eccentric.
(B)
and turn Balance Wheel
of
Reference Hole ( G )
of
Fig.26,27,28)
feed Dog ( C )
(B).
See
is
flush with Throat
Fig.26.
Fig.27
).
(E)
slowly until the upper edge
of
feed and feed lifting
of
-
13-
4)
Leave a clearance
(
H),
then tighten Set Screws
of
0.3-0.Smm between Feed and Feed Lifting Eccentric ( B ) and Eccentric Sleeve
(A)
and
(D).
0.3-0.
5mm
(0\---
~'/
_..;
"·
Fig.28
21. ADJUST OPENING TIME OF THE TENSION DISCS (
within the presser foot lift range
I) Remove the rubber plug from the back
2) Move the tension releasing cam leftward for earlier opening or rightward for later opening.
the adjustment to put under the presser foot a block as thick
3) After the adjustment fully tighten Screw
of
2-7mm opening time
of
ann
and loosen
(A).
of
the tension discs can be adjusted as follows:
Screvv
(A)
of
knee lifter lever ( left
as
the presser foot lift.
Fig.29)
).
It
will facilitate
'-----Cam
Fig.29
-14-
22. LUBRICATION ADJUSTMENT (
A.
Adjusting
ln ordinary operation, adjustment is ndt required for the oil pump.
check window
hole.
B.
Adjusting the lubrication
The lubrication
I)
Turn Oil Adjusting Screw ( A ) clockwise
counterclockwise to decrease oil.
2)
Oil
tightened,
as
follows: remove the throat plate and place a piece
then check
oil
3) Readjustment depends on temperature, sewing speed and the like. In practice, oil amount can be judged
oil
pump.
vvhen
the machine runs at a low, speed ( approx.2000spm
of
the rotating hook can be adjusted by Oil Adjusting Screw
Adjusting Screw (
amount is maximum.
the
oil
splashed
on
of
rotating hook.
A)
adjusts
the paper.
oil
amount within 5 tums. When Oil Adjusting Screw (
Fig.30)
If
oil splashing does not occur in the oil
),
reduce the clearance
(A)
as follows:
to
increase oil and turn Oil Adjusting Screw ( A )
of
paper on instead, run the machine for about
of
the by-pass
A)
20
A
is fully
seconds,
Fig.30
-
15-
23. REGULAR CLEANING ( Fig.31,32,33)
l)
Cleaning feed dog ( See Fig.31 )
Remove the throat plate and clear off the dust and lint between feed dog tooth slots.
Feed
dog
Feed
Fig.3l
2)
Cleaning rotating hook
Swing out the machine head and clean the hook. Wipe the bobbin case with soft cloth.
3) Cleaning oil pump, screen
Swing out the machine head and clear off the dust and dirt on oil pump screen.