Global WF904 User manual

'· '
GLGBAL
WF904
INDUSTRIAL SE\VING MACHINE
Flat Bed
Extra Heavy Duty
-Compound-Feed
INSTRUCTION MANUAL
CATALOG

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INSTRUCTION MANUAL
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CONTENT
PRECAUTIONS FOR USER----------------------------------------------------- 1
2 S:PECIF'ICATION------------------------------------------------------------------ 2
3 PREPARATION
F'OR OPERATION-------------------------------------------- 2
a. Cleaing the machine---------------------------------------------------------------- 2
b. Examination------------------------------------------------------------------------- 2
c. Lubrication-------------------------------------------------------------------------- 2
d. Testing------------------------------------------------------------------------------ 3
4 IIO\\' TO ATTACII A NEE])LE------------------------------------------------- 3
5 \\'IN])ING
OF' BOBBIN TIIREA])---------------------------------------------- 4
6 A])JUSTMENT
OF' TIIE BOBBIN \\'INl)ER---------------------------------· 4
7 TIIREA])ING ---------------------------------------------------------------------- 5
8 REMOVING AN]) INSERTING THE BOBBIN------------------------------· 5
9 A])JUSTING THE THREA]) TENSION---------------------------------------· 6
I0 ADJUSTMENT OF PRESSER PRESSURE------------------------------------ 6
11 ADJUSTMENT OF \\' ALKING F'OOT AND PRESSER FOOT------------ 7
12 ADJUSTMENT OF STTICII LENGTII
AN]) FOR\\'ARl)/BACK\\' ARD SE\\'ING---------------------------- 7
13 F'EE]) DOG IIEIGIIT-------------------------------------------------------------- 8
14 ADJUSTING TIIE IIEIGHT OF TIIE NEE])LE BAR-----------------------· 8

1. PRECAUTIONS FOR USER
(1) Precautions for Safety
CD When turning the power on, keep your hands and fingers away from the area
around/under the needle and area around the pulley.
® The power must be turned off when the machine is not used, or when the
operator leaves his/her seat.
@ The power must be turned off before installing or remove the "V" belt,
adjusting the machine, or when replaceing
@ Avoid placing fingers, hairs, bars etc. near the pulley, the "V" belt and the
motor when the machine is in operation.
@ Do not put fingers under/around the needle or the pulley when the machine is
in operation.
(2) Precautions before Operation
CD Never operate the machine before it is lubricated fully.
® When a new sewing machine is first turned on, verify the rotational direction
of the pulley with the power on.
(The pulley should rotate counterclockwise when viewed from the pulley)
@ Verify the voltage and phase (single or three) with those given on the motor
nameplate.
(3) Precautions for Operating Conditions
CD Avoid using the machine at abnormally high temperature (35°C or higher) or
low temperature (5°C or lower).
® Avoid using the machine in dusty conditions.
@ Avoid using the machine in areas where there are too much electrical noise
which resulted from the high-frequency weld and others.
1

2. SPECIFICATION
Max. sewing speed (r.p.m)
800 r.p.m
Needle No. DYx3
26#
Needle bar stroke (mm)
56
Thread take-up lever stroke (mm) 96
Stitch length
(mm)
0-11
By hand
(mm)
13
Presser-foot stroke
~~
By knee
(mm)
20
./
3. PREPARATION FOR OPERATION
( 1) Clean the machine
Before leaving the factory, the machine parts are coated with rust-preventive
grease, which may be hardened and contaminated
by dust during storage and
shipment. This grease must be removed with gasoline.
(2) Examination
Though every machine is confirmed by strict inspection and test before leaving
the factory, the machine parts may be loose
or deformed after long distance
transportation with jolt. A thorough examination must be performed after cleaning the
machine.
Tum the pulley to see if there is running obstruction, parts collision, uneven
resistance
or abnormal noise. If these exist, adjustment must be made accordingly
before run-in operation
(3) Lubrication (Fig.
I)
When a new sewing machine is used for the first time, or sewing machine left
out
of use for considerably long time is used again, replenish a suitable amount of oil
to the portions indicated
by arrow in below figure.
2

CAUTION: Please use white spindle oil.
Always keep the presser lifted before attempting a dry run.
Fig.I
(4) Testing
In order to get the best working situation, run the sewing machine in a low
speed for about 1 month after lubricated fully. Then increase the speed to the need
one.
4. HOW TO ATTACH A NEEDLE (Fig.2)
CAUTION: Before using the following procedures, be
sure to tum the power switch off.
_Oil_.. ........... .,, ....cl.tmp ................ k;.;;~i;;-.;.-1
..- .... .,, .... ,.. .... loft
The needle used by this sewing machine is
DYx3 26#. During operation, proper needle
can be chosen according to the sewing
thread. (The sewing thread should be able to
pass the pinhole.)
3
0
Fig.2
............ ~~- !
x x

5 .. WINDING OF BOBBIN THREAD (Fig.3)
(I) Push the bobbin ® on the bobbin winder shaft as far as it will go.
(2) Bring the thread forward toward the bobbin and wind from below
in clockwise direction
several times around the bobbin.
(3) Push the level @ toward other side so that the driving wheel and driven wheel will engage
and then start the machine.
(4) The driven wheel will automatically be free from the driving wheel and stop after the
bobbin
is filled with thread.
Fig.3
6. ADJUSTMENT OF THE BOBBIN WINDER (Fig.3)
( 1) In case of uneven winding
If the thread does not wind evenly on the bobbin, loosen the nut CD and move
the bracket ® to the right or to the left as may be required, then tighten the nut.
(2) Winding amount
if thread
Adjusting ® can increase or drcerase the amount
of thread wound on the
bobbin.
4
'

(3) Winding strength
Strength
of the winding can be adjusted with the nut CD.
7. THREADING (Fig.4)
Raise the needle bar to its higest position and route the upper thread in the order
illustrated below.
Fig.4
8. REMOVING AND INSERTING THE BOBBIN
(I) Removing: Open the shuttle race cap and the bobbin holder, then take out the
bobbin.
(2) Installation: Put the bobbin in the rotary hook case, Permit about 5cm
of
bobbin thread to hand down freely. Install the bobbin in the bobbin case so
that the thread wound direction is clockwise. Then colse the rotary hook and
the shuttle race cap.
5

9. ADJUSTMENT THE THREAD TENSION (Fig.5)
For ordinary stitching, the tension of the upper and the lower threads should be
equal.
Well balanced stitch
Upper thread is too str~
or lower thread is too weak
x
Upper thread is too weak
or lower thread is too strong
Fig.5
(1) Tension
of the Upper thread
Before adjusting the tension
of the upper thread, be sure that presser foor is let
down.
To adjust tension, turn serrated nut on tension device to the right (clockwiseO
will increase the thread tension, while turning it to the left (counter-clockwise) will
decrease the tension.
(2) Tension
of the lower thread
The lower thread tension is controlled by the larger screw near the end of the spring
at the outside
of the bobbin case. Turning this screw to the right (clockwise) will
increase the thread tension, while turning it to the left (counter-clockwise) will
decrease the tension.
10. ADJUSTMENT OF PRESSER PRESSURE (Fig.6)
( 1) Pressure should be adjusted according to the material to
be sewn.
(2) Pressure on both the walking foot and the presser foot
can be adjusted.(The adjusting screw has been set before
shipment.)
(3) Sewing pressure should be adjusted to the minimum
required strength.
6
r---~----,

11 ADJUSTMENT OF WALKING FOOT AND PRESSER FOOT
(Fig.7)
(I). The alternating movement on the walking foot and presser foot can be adjusted
by changing the position relations
of the parts of the presser foot lifting mechanism.
(2) Changing the position relation
of the connecting link 2 and the crank 3 can
complete the adjustment.
(3) Adjustment should be changed according to the thickness
of the material to be
sewn.
Fig.7
12. ADJUSMENT OF STITCH LENGTH
FORWARD/BACKWARD SEWING (Fig.8)
( 1) Adjusting the stitch length adjusting bolt can change the stitch length.
(2) Stitch length can be adjusted between
0-11 mm.
(4) Setting the stitch length adjusting bolt above
"O" can backstitch.
Fig.8
7
AND