Global WF904 User manual

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

,r .
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

13. FEED DOG HEIGHT (Fig.9)
The feed dog should be 1.5 mm higher than the vertex of
the needle plate. Adjustment of the feed dog height can be done as
follows:
(I) Turn the machine pulley so as to raise the feed dog to its
highest point.
(2) Loosen the screw
of the feed dog and adjust the height
by raising or lowering it. Then tighten the screw. Fig.9
14. ADJUSTING THE HEIGHT OF THE NEEDLE BAR (Fig.10)
1.5mm
When the needle bar is at its highest point, normally the measurement between the
highest point
of the needle plate and the needlepoint is 28 mm. When this distance
need to be adjusted, the steps is
as follows:
(I) Take down the face plate, adjust the needle bar to its highest position.
(2) Loosen the screw
of needle bar connecting stud screw.
(3) Adjust the needle bar to the right position.
(4) Tighten the screw.
28mm
~~~~ - - - - - J
Fig.IO
8

PARTS CATALOG

A: BODY AND ITS ACCESSORIES
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A: BODY AND ITS ACCESSORIES
No. Ref. No. Description Pcs.
Al H9601001 Arm 1
A2 H9601002 Bed 1
A3 H9601003 Oil pipe 1
A4 H9601004 Oil wick 3
AS
H9601005 Rubber plug 2
A6 H9601006 Needle bar guide bracket stud bushing 1
A7
H9601007 Set Screw 1
A8
H9601008 Set Screw 1
A9 H9601009 Presser bar bushing -1 -
--
AlO H9601010 Set Screw 1
Al 1 H9601011 Pin 1
A12 H9601012 Set Screw 1
A13 H9601013 Mandril
of needle bar guide bracket 1
A14 H9601014 Set Screw 1
A15 H9601015 Arm side cover 1
A16 H9601016 Screw 1
Al7 H9601017 Face plate 1 I
A18 H9601018 Screw 2 !
Al9
H9601019 Thread guide 1
A20 H9601020 Screw 1
A21
H9601021 Nut \ 1
A22 H9601022 Tension spring 1 i
A23 H9601023 Tension disc 2
A24 H9601024 Tension screw stud -1
A25 H9601025 Tension nut 1
A26 H9601026 Thread tension regulator complete base 1
A27 H9601027 Screw 2
A28 H9601028 Tension releasing disc 1
A29 H9601029 Screw 1
A30 H9601030 Thread guide 1
A31
H9601031 Tension nut 1
~-
A32 H9601032 Tension spring -1
A33 H9601033 Washer 2
A34 H9601034 Felt 2
A35 H9601035 Damping plate 1
A36 H9601036 Tension screw stud 1
A37 H9601037 Nut 1
A38 H9601038 Thread take-up spring 1
A39 H9601039 Spring 1
A40 H9601040 Thread take-up spring guide plate 1
A41
H9601041 Screw 1

A42 H9601042 Screw 1
A43 H9601043 Nut 1
A44 H9601044 Tension spring 1
A45 H9601045 Tension disc 1
A46 H9601046 Thread tension regulator complete base 1
A47 H9601047 Screw 1
A48 H9601048 Thread guide 1
A49 H9601049 Screw 1
A50 H9601050 Rubber plug 1

B: NEEDLE BAR AND THREAD TAKE-UP MECHANISM
::~,
q?~
I~~~
30 29 31 32 33 4

/
B: NEEDLE BAR AND THREAD TAKE-UP MECHANISM
No. Ref. No. Description Pcs.
Bl H9602001 Pulley 1
B2 H9602002 Screw 1
B3 H9602003 Screw 1
B4 H9602004 Arm shaft 1
B5 H9602005 Collar 1
B6 H9602006 Set Screw 2
B7 H9602007 Thread take-up cam 1
B8 H9602008 Needle bar connecting base link screw 1 -
B9 H9602009 Screw -2
·~-
BIO H9602010 Set Screw 2
Bl 1 H9602011 Pin 1
Bl2 H9602012 Thread take-up lever 1
Bl3 89602013 Screw 1
B14 H9602014 Roller 1
Bl5 H9602015 Roller pin 1
(_
Bl6 H9602016 Nut 1
-
Bl7 H9602017 Retaining ring-E type 1
B18 H9602018 Needle bar connecting link screw 1
..
B19 H9602019 Nut " 1
B20 89602020 Needle bar connecting link \ 1
B21 H9602021 Needle
bar connecting stud \ 1
B22 H9602022 Set Screw 2
B23 H9602023 Needle bar 1
-B24 H9602024 Screw
._ 1
\ B25 H9602025 Needle 1
B26 H9602026 Needle bar guide bracket 1
B27 H9602027 Needle bar guide bracket pin 1
B28 H9602028 Oil wick 1
B29 H9602029 Needle bar guide bracket plate 1
B30 H9602030 Screw 1
B31
H9602031 Screw 1
B32 H9602032 Needle bar guide bracket plate base 1
~
-
B33 H9602033 Screw -1
B34 H9602034 Bushing 1
B35 H9602035 Set Screw 1
B36 H9602036 Felt 3
B37 H9602037 Bushing 1
B38 H9602038 Set Screw 1
B39 H9602039 Bushing 1
B40 H9602040 Set Screw 1

C: LOWER SHAFT MECHANISM

C: LOWER SHAFT MECHANISM
No. Ref. No. Description Pcs.
Cl H9603001 Eccentric 1
C2 H9603002 Set screw 1
C3
H9603003 Pin 2
C4 H9603004 Screw 2
C5
H9603005 Washer 2
C6 H9603006 Bearing 1
C7 H9603007 Eccentric cover 1
C8 H9603008 Screw 2 -
C9 H9603009 Crank connecting rod 1
--
CIO H9603010 Crank connecting rod pin 1
Cl 1 H9603011 Pin 1
Cl2 H9603012 Screw 1
Cl3 H9603013 Shuttle shaft 1
Cl4
H9603014 Plate 1
Cl5 H9603015 Plate 1
C16 H9603016 Screw 2
Cl7
H9603017 Nut 2
C18 H9603018 Inside shaft 1
Cl9 H9603019 Oil wich 1
C20 H9603020 Rivet 1
C21 H9603021 Lower shaft crank 1
C22 H9603022 Screw 1
C23 H9603023 Shuttle shaft slide block 1
C24 H9603024 Screw 1
C25 H9603025 Nut 1
C26 H9603026 Lower shaft 1
C27 H9603027 Collar 1
C28 H9603028 Set screw 2
C29 H9603029 Shuttle driver 1
C30 H9603030 Pin 1
C31 H9603031 Bobbin 1
-~
C32 H9603032 Shuttle hook base 1
C33 H9603033 Felt ,_ 1
C34 H9603034 Screw 1
C35 H9603035 Shuttle race body 1
C36 H9603036 Screw 2
C37 H9603037 Spring 2
C38 H9603038 Shuttle race cap 1
C39 H9603039 Bushing
.1
C40 H9603040 Set screw 1
C41 H9603041 Set screw 1

C42 H9603042 Bushing 1
C43 H9603043 Set screw 1
C44 H9603044 Set screw 2