Global WF976 Parts list manual

GLGBAL
WF976
CYLINDER BED TWIN NEEDLE,
COMPOUND FEED
LOCKSTITCH SEWING MACHINE
OPERATION I INSTRUCTION I PARTS MANUAL
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Content
Operation Instruction
I. Briefintroduction .................................... --·············--··············································-'
2. Main specification .................................................................................................... I
3.
Installing the machine ............................................................................................... I
4.lnstalling the motor. .................................................................................................. 2
5.
Connecting the clutch to the pedal.. ............................................................................ 2
6.
Installing the presser foot lift control plate .................................................................. 2
7.
Installing the bobbin winder. ...................................................................................... 3
8.
Installing the thread spool stand ................................................................................. 3
9.
Operation preparation ............................................................................................... 3
I0.
Lubrication ........................................................................................................... .4
II. Trial run ................................................................................................................ .4
12. Installing the needle ............................................................................................... .4
I3. Coordination among needle, thread and materials ...................................................... 5
I4.
Threading the needle thread ..................................................................................... 5
15.
Adjusting the tension of bobbin thread and needle thread ........................................... 5
16. Winding adjustment.
............................................................................................... 6
I7.
Setting the stitch length and reverse sewing .............................................................. 7
I8.
Adjusting the pressure of presser foot ....................................................................... 7
I9.
Function of the safety cIutch .................................................................................... 7
20. Adjusting the lift amount of presser foot with walking presser foot.. ........................... 8
21 . Adjusting the position of the feed dog ....................................................................... 8
22.
Timing feed adjustment.. ......................................................................................... 8
23.
Adjusting the timing between needle and rotating hook ......., ...................................... 9
24.
Relationship between the rotating hook and hook separator ........................................ 9
25.
Removing and installing the rotating hook ................................................................ 9
Parts Manual
1. Arm and bed ....................................................................................................... I0-11
2. Upper shaft and thread take-up parts .................................................................... l2-13
3. Presser bar and draw bar parts .............................................................................. 14-1 5
4.
Lower shaft and rotating hook parts ..................................................................... 16-1 7
5. Feed
shaft parts .................................................................................................. 18-19
6.
Upper feed and presser foot lifter parts ................................................................. Z0-21
7. Threading parts .................................................................................................. 22-23
8.
Accessories ........................................................................................................ 24-25
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Operation Instruction
From the library of: Superior Sewing Machine & Supply LLC
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1. Brief instruction
This series adopt slide take-up lever. vertical
rotating hook which forms two lines of lockstitch
seam.Upper shaft and lower shaft are driven by
teeth-type synchronic belt, and adjusted by
lever-type stitch length adjusting mechanism. This
series are equiped with safety clutch mechanism to
avoid the damage to machine when overloading
occurs. The feed mechanism is designed with
compound feed of timing feed between upper feed
with
alternating presser foot and lower feed with
needle and feed dog.
This
series are widely used in producing heavy
weight materials such as bag, luggage, cushion, etc.
They are suitable for sewing arc and cylinder type
products.
J3. Installing the machine
I. Location of the machine
To ensure a smooth running, the machine should be
located on rigid and flat floor. The insert of rubber
mat between machine stand and floor is recommended
for further reducing the runing noise and vibration.
2. Oil
reservoir installation (Fig. I)
Put the oil reservoir into the table cutout, and place
the four
cushions on the four corners of the cutout,
then place oil felt into the oil reservoir.
3.lnstalling the machine head (Fig.2)
Install the hinge into the base of the machine, then
move the machine head freely till it is seated on the
frame of the table cutout, then tighten the screws A.
-1-
2. Main specification
TYPE
WF976
I
Application Medium and heavy duty
Max.sewing speed
2000spm
Stitch length 0-6mm
Needle bar stroke 33.2mm
Clearance under 8.5mm by hand,
presser foot lift 14mm by pedal
Rotating hook Vertical
Needle
DPX 17 18#-23#
Lubrication
Semi-automatic
Power 370W
Needle guagc 1/8" ,I
/4" ,5/16" ,3/8"
I ·o"
• 1.:..
--
lJ_
Oil reservoir
TTe
~
"
...
Bed
/ E
~
0
~A
IC < ./
IS:
c: c:: c::
<
.::::::: .::::::: <j
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5
c
1 0-12mm
E---1+'~
D'---+----1-
C----1'
s.---tr...1r"\
A~~d::b
A
B
X
,4. Installing the motor (Fig.3) r
Move the motor C leftward and rightward until the
balance wheel groove A is aligned with the belt
groove B. Make sure that the
belt does not touch the
table.
5. Connecting the clutch to the pedal (Fig.4)
!.The optimum tilt angle of pedal with floor is
approx 20-30 degree.
2.Adjust the clutch E
of the motor so that clutch
lever C and draw
barB run in line.
3.The machine balance wheel
shold rotate counter
clockwise for normal sewing when view from
opposite side of the balance wheel. The motor should
rotate in the same direction.
The rotation can be
reversed by reversing (turn over 180 deg)the plug of
the motor.
4.Adjustthe tension
ofY-belt by moving the motor
vertically. The proper
tension ofY-belt is a slack of
I0-12mm when the belt is depressed (at the belt pan)
by finger.
6. Installing the presser foot lift control plate (Fig.S)
Connect the draw bar hook A to the presser foot lift
lever V, and install the pedal assembly Don the spring
of the machine stand, then move the control plate E
leftward and
rightward until the chains run in line.
Tighten the
connector by bolt ad nut. Finally connect
the control plate with the chain hook.
-2-
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,7. Installing the bobbin winder (Fig.6) I
Align the pulley B with the outside of belt C, and
there should be a certain clearance between them, so
that pulley B could be in touch with belt after the stop
latch thumb lever A is depressed, thereby belt drives
the pulley B while machine is running. Make sure that
the bobbin winder is in parallel with the belt slit E of
table, then tighten it by two wood screws D.
8. Installing the thread spool stand (Fog. 7)
Locate the thread spool stand at the right front of
the table. Make sure that the spool stand may not ob
struct when the machine head is turned backward,
then tighten the nut C.
19. Operation preparation
!.Cleaning the machine
Before delivery, the machine parts are coated with
rust preventive grease, which may be hardened and
contaminated by dust during storage and shipment.
The grease must be removed by clean cloth with
gasoline.
2.Examination
Though every machine has been confirmed by
strict test and inspection before delivery, the machine
parts may be loosed or deformed after long
transportation with jolt. A thourough examination
must be performed after clean the machine. Turn the
machine balance wheel to check if there is running
obstruction, parts collision, uneven resistance or
abnmormal noise. If these exist, adjustment must be
made
accordingly before run.
-3-
6
e,~-
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9
a
Long groove
leftward
b
X X
c
10. Lubrication (Fig.8)
Before dclivry, amount oil must be filled into the
position as arrows show in the Fig. If the machine is
in
constant use, the machine should be oiled not less
twice for one running.
11. Trial run
When the machine starts for the intial time or reuse
after a long period of time, lift the presser foot and
run the
machine at the speed of I 000-1500spm for
about 30 minutes, then raise the speed gradually.
12. Installing the needle (Fig.9)
Turn the balance wheel to lift the needle bar to its
highest position. Loosen the needle set screw I, make
the long
groove of the needle toward the left side of
the operator, then fully insert the needle shank to the
bottom
of the needle socket. Then tighten the screw
I to set the needle as Fig a.
Note:
Fig.b: Insufficient insertion
Fig.c: Wrong insertion
-4-
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13. Coordination among needle, thread and materials
The needle thread should be left-twisted. Hold the
thread by left hand, twist it by right hand in the
direction shown as Fig. If the thread becomes tight, it
is
left-twisted; on the contrary, it is right-twisted.
The coarseness of needle should be in accordance
with the nature ofmaterials. If stitch on heavy duty
material with a slim needle, the needle will be easily
bent, skipped or broken. On the contrary, if stitch on
tight woven materials with a very coarse needle, the
material will be destroyed with over-big needle hole.
Therefore, the needle and thread should be properly
selected.
14. Threading the needle thread (Fig. II)
When threading the needle thread, the needle bar
should be lifted to its highest position, lead the thread
from
the spool and pass it in the order instructed.
Threading order as shown in Fig: thread guide A-
three-eye thread guide B-tension disc C-thread control
plateD-thread take-up springE-upper thread guide F-
thread take-up lever G-upper thread guide Flower
thread guide !-needle bar thread guide J-needle K
15. Adjusting the tension of bobbin thread and needle thread (Fig.l2)
The tension of needle thread and bobbin thread
should be properly adjusted. Normal stitch form
should be as shown in Fig.l2.1. If the tension disc is
too tight or too loose, the abnormal stitch form occurs
as shown in Fig.l2.b,c.
!.Adjusting the tension of bobbin thread
The tension of bobbin thread could be adjusted
according to the nature of material:
I)Turn the balance wheel by hand to lift the thread
take-up lever to its highest position;
2)Remove the slide plate, then the adjusting screw
A could be found in Fig;
3)Turn
the screw A clockwise to increase the
tension of bobbin thread;
4 )lfturn it counter clockwise, the tension of
bobbin thread will be decreased.
-5-
OCD
X®
X©
11
12
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8mm standard
( 3)
(4)
13
CD ®
2.Adjusting the tension of needle thread
I )Adjusting the pressure of tension disc: as shown in
Fig
(2) Generally, the tension of needle thread is
adjusted by adjusting the pressure of adjusting tension
disc. Turn
the nutA clockwise to increase the pressure
of the tension disc, on the contrary, to decrease the
pressure of tension disc.
2)Adjusting the tension of take-up spring:
Light duty material 20g
Common material 25g
Heavy duty material
30g
Adjusting method: as shown in Fig(3):
Loosen the nut A, turn the thread take-up spring
shaft counter clockwise to increase the tension. on the
contrary, to decrease the tension. Insert the screw
driver into the slit of the thread take-up spring shaft,
turn
it until the required tension is obtained.
3)The vibrating range of the thread take-up spring:
Thread take-up spring must be able to vibrate. When
the
thread take-up lever is lifted to its highest position.
the vibrating range of it should be as follows:
Light duty material over 8mm
Common material around 8mm
Heavy duty material less than 8mm
Adjusting method: as shown in Fig.(4)
a.Loosen the presser foot lever;
b.Loosen the position screw A;
c.Turn the position plate B counter clockwise to
increase the vibrating range, on the contrary, to
decrease the vibrating range;
d.Tighten the position screw A.
16. Winding adjustment(Fig.13)
The wound bobbin thread should be neat and tight.
If not, adjust the thread tension by turning the tension
stud thumb nut of the bobbin winder tension bracket
A. If the wound bobbin is not neat, adjust it by moving
the thread guide bracket B. When adjusting, loosen
the screw C first, then move the bracket rightward if
the thread is wound to one side as shown in Fig. I3.
(2); move the
bracket leftward if the thread is wound
to
one side as shown in Fig. I3 .( 3 ).
Note: Nylon or polyester thread should be wound
with light tension. Otherwise the bobbin D might be
deformed or broken.
The optimum capacity ofthread will fill about 80%
of the outside diameter of bobbin. and this can be
adjusted by adjusting screw E.
-6-
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17. Setting the stitch length and reverse sewing (Fig.l4)
Stitch length could be adjusted by turning the stitch
length
regulating nut. When the scale on the stitch
length
adjusting position block is aligned with some
figure on the stitch length dial plate, then the figure
indicates the stitch length. Reverse sewing can be
obtained when reverse feed lever is depressed and
forward
sewing can be restored automatically when
reverse feed lever is released.
18. Adjusting the pressure of presser foot (Fig. IS)
Pressure on presser foot is to be adjusted in
accordance with materials to be sewn. If heavy
materials to be sewn, turn the pressure regulating
screw clockwise as shown in Fing.l5 to increase the
pressure. While light materials to be sewn, turn the
pressure regulating screw counter clockwise to
decrease the pressure.
19. Function of the safety clutch (Fig.16)
When the thread is twisted into the rotating hook
because of abnormal operation, the spring plate on
the
clutch will automatically get off the bushing of
belt wheel shaft. Turn the eccentric pin to adjust the
load on
the clutch.
When the arrow of the eccentric pin is aligned with
the
center of the lower shaft, it indicates the weakest
power on the clutch; when the arrow is toward the
outside, the power is stronger. When the safety clutch
swtichs off, turn the balance wheel clockwise by right
hand, when the stop plate stops the wheel, turn the
balance wheel to make it switch on again, then loosen
the
button.
When the clutch switchs off. the synchronic belt
should be re-installed. First, turn the balance wheel
counter clockwise to lift the thread take-up lever to
its
highest position, meanwhile, the red arrow on the
synchronic belt wheel should be aligned with the
arrow on
the position plate. Then install the
synchronic belt.
-7-
14
\
l
Counter clockwise Clockwise
l
Arrow
Eccentric pin
Red arrow
Position plate arrow
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17
l
l
B
d>/lf'>!!',s:!-= 0. Bmm
~l.Omm
~1.2mm
,~1.5mm
B
20. Adjusting the lift amount of presser foot with walking presser foot (Fig.l1)
The lift amount of walking presser foot together
with presser foot can be adjusted as follows:
Loosen the wing
nut A and adjust its center distance
B between wing nut A and the presser foot lift shaft.
Shorten the
center distance B to increase the lift
amount; widen the center distance B to decrease the
lift amount. After adjustment, tighten the screw, turn
the balance wheel
slowly to check if there is parts
collision.
21. Adjusting the position of the feed dog (Fig. IS)
When the feed dog is raised to its highest position,
the height from the teeth point to the surface of needle
plate should be in accordance with the materials.
When sewing heavy duty materials such as leather,
the
height should be about 1.2mm. when sewing light
duty materials, the
height should be about 0.8mm.
when sewing common materials, the height should be
about Imm, when sewing extra heavy duty materials,
the height should be about I.Smm. when adjusting the
position of feed dog, first loosen the feed dog screw
A, and move it vertical1y to reach its required height,
then tighten the screw.
122. Timing feed adjustment (Fig.19) I
!.Standard position
When the feed dog is just above the surface of
needle plate and begin feeding, the needle should
move downward, close to the surface of needle plate
and is aligned with the needle hole on the feed dog
body.
Adjustment can be adjusted by adjusting the
position
of feed dog cam and vibrating shaft crank.
2.Installing the feed
dog
First, adjust the stitch length to 0, open the upper
cover, turn the balance wheel counter clockwise by
right hand, the front oil A
hole on upper shaft is the
basic point, when the A is
vertically upward. feed
dog two screws Bare symmetrical.
-8-
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23. Adjusting the timing between needle and rotating hook (Fig.20)
Turn the balance wheel to lower the needle bar to its
lowest position. Then when the needle is lifted 2.5mm
from its
lowest position, hook point should be
coincided with the center line of the needle. The
clearance between hook point and upper end of needle
hole is approx 2mm. !fit is not, loosen the screw A.
move the needle bar vertically to its required position,
then
tighten the screw A. when adjusting, note that the
side clearance between hook point and needle should
be
0-0.05mm.
24. Relationship between the rotating hook and hook separator (Fig.20)
!.Remove the slide plate;
2.Turn
the balance wheel and stop when the biggest
distance between the hook separator and rotating hook
A is
obtained;
3.Loosen the adjusting screw B so that the clearance
between separator and rotating hook is 0.15mm.
(Adjust in accordance with the thickness of materials);
4.After adjustment, tighten the adjusting screw B.
25. Removing and installing the rotating hook (Fig.22)
If the rotating hook is damaged during sewing, replace
it as follows:
I.Lift the needle bar to its highest position and
remove the needle;
2.Remove the slide plate, needle plate, front and
rear presser plate and bobbin;
}.Release the adjusting screw A, remove the
separator B;
4.Release the screw C and remove the presser plate
D·
5.Turn the hook base E slightly and take it out;
6.Release the screw and take out the hook body F.
Installing the rotaing hook:
l.Install the rotating hook in the reverse process
above;
2.Note that installing direction is the same with
removing direction.
-9-
2
A
B
0.0511111
21
0. 1511111
=
IIIII o 1111
22
.,
B D E
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Parts Manual
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1. Arm and bed
I
26
JJ;-~~25
4
32
3
49
-10-
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1. Arm and bed
No.
Part number
Name
Qt.
Remark
I
9!WF2-001
Cylinder bed I
2
91WF2-002
Arm I
3 22WF2-003
Base 1
4
37T4-407 Hinge 1
5
22WF2-004 Screw
6
6
37T4-409
Connecting hook I
7
22WF2-006 Connecting hook screw assembly I
8
37T4-411 Washer I
9 22WF2-020 Screw I
10 91WF2-003 Face plate I
11
89WF2-006
Face plate hinge assembly 1
12
89WF2-005 Hinge screw 8
13
49WFI-006 Rubber plug I
14
89WF2-004 Spring plate I
15
91WF2-004 Safety guard I
16
49WF2-009 Screw 2
17
91WF2-005
Upper cover I
18 49WF2-012 Screw 8
19 49WF2-013 Seal gasket 1
20
49WF2-014 Oil window I
21 49WF2-015 Spring I
22
7KT2-020 Washer I
23
49WF2-016 Column I
24
!3WF6-008 Screw I
25
49WF2-017 Pin I
26
49WF2-018 Spring I
27
49WF2-019 Column I
28
17T5-016
Screw I
29
49WF2-020 Pin I
30
49WF2-021 Oil tube I
31
Oil wick I
32
16WF2-038 Oil retainer I
33 16WF2-059
Screw
I
34
90WF2-005 Trade mark
91WF2-006 Trade mark I
35
16WF2-053 Trade mark I
36
Rivet 4
37
I KTI-005
Trade mark I
38
91WF2-007 Needle plate I
39
91WF2-008 Screw 2
11/64'X32
40
91WF2-009 Slide
plate assembly(L) I
41 91WF2-0IO Slide
plate assemblyO I
42 91 WF2-0
11
Right presser plate (long) I
43
9!WF2-012
Left presser plate (short) I
44 91 WF2-0 13 Right
presser foot (long) I
45 91WF2-014 Left
presser foot (short) I
46
22WF2-007 Screw 8
9/64'X40
47 91WF2-015 Connecting presser plate 2
48 16WF2-035 Screw 10
ll/64'X40
49
91WF2-016 Safety ring I
50
91 WF2-0 17 Connecting holder I
51 91WF2-018 Screw 2
52 Washer 2
53 22WF2-018
Connecting pin 2
--11-
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2. Upper shaft and th read take
_ -up part
- s
14 12
4 3 t J
7 r
0.
s--LPf
1'
11 i
8 10
6
20~
rl
18
-12-
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2. Upper shaft and thread take-up parts
No.
Part number
1 49WF!-003
2 49WF!-004
3
4 91WF!-002
5 215029
6
7
l6WFl-011
8 16WF!-Ol5
9 16WF1-016
10 16WFI-017
I I
12 16WF1-0IR
13
16WF1-019
14
16WF1-020
15
16WFI-021
16 16WF1-022
17 22WF1-005
18
19 103565
20 16WF1-025
21 22WF1-006
22 16WF1-004
23 16WF1-026
24
22WF1-047
25 22WF1-048
26
27 16WF1-029
28 22WF1-043
29 22WFI-011
30 22WF1-045
31
22WF1-046
32 037473
33
13WF 1-077
34 13WFl-078
35 16WF1-040
36 91WF1-017
37 22WF1-041
38 16WF1-019
39 22WF1-042
Name
----
Thr
cad take-up lever pin sh
Scr
ew
Oil wick
Thr cad take-up lever
de blcok Sli
Oil
wick
Ne
edle bar link
Ne
edlc bar crank pin
ition screw
Pos
Scr ew
Oil wick
Ne
cd]c bar crank
Pos it ion screw
Scr cw
Spa
ccr
Scr
ew
Up
Oil
per shaft
wick
Fro
Oil
nt bushing
felt
Mi ddle bushing
Scr ew
Re
arbushing
Re ar bushing gasket
Scr
ew
Rc ar bushing bearing
awmg ring
chronic belt wheel
Ret
Syn
Scr
Scr
Scr
Bal
Scr
Scr
Scr
ew
ew (short)
ew (long)
a nee wheel
ew
ew
ew
Syn chronic belt
Mi ddle bushing gasket
Scr
ew
Nut
··13~
-
------
Qt.
Remark
aft
1
1
1
1
I
1
1
1
1
I
1
1
1
1
I
1
I
1
I
:l
1
2
I
1
2
I
I
1
1
I
I
I 1
I
I
1
1
1
1
I
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3. Presser bar and draw bar parts
·---·---·-·· -·------------------~
30
~~
u--··--- ------14
---13
26 25
24
r 0
2
29-- --"@""' ---
28
--14-
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3. Presser bar and draw bar pat"ts
No. Part number Name
1-----1-----------11-·~---
I I6WF4-00I
Presser foot lift lever shaft
2 I6WF4-002
3 22WF3-00I
4 I6WF3-059
5 22WF3-002
6 22WF3-003
7 22WF3-004
8 I6WF4-009
9 I6WF4-023
IO
I6WFI-009
I1 16WF4-00R
12 037522
13 22WF3-005
14
16WF4-027
15 22WF3-006
16
16WF3-025
17
I6WF3-025
18
16WF4-021
19 16WF4-022
20 16WF4-020
21
22WF3-007
22 16WF2-033
23
22WF3-008
24 22WF3-00\J
25
22WF3-0IO
26 22WF3-0 l l
27 22WF3-012
28
22WF3-0I3
29 22WF3-0I4
30 22WF3-015
Presser foot lift lever
Spring
Screw
Presser foot lift bar
Screw
Nut
Spring
Spring bracket
Screw
Screw
Screw
Presser bar
Presser bar upper hushing
Presser bar lower hushing
Screw
Screw
Guide bracket
Screw
Guide shaft
Guide bracket
Screw
Spring
Presser foot lift releasing
Presser plate
Screw
Presser plate pin
Preser foot
Screw
Position plate
'-----'-----~------ -----
---15--
plate
Qt. Remark
1
1
I
1
I
1
2
I
I
1
I
1
1
1
I
2
1
1
1
I
1
1
1
I
I
I
I
I
I
1
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4. Lowers
k Pa •·ts
haft and ro ------
tating hoo --- ------
~
41-~
-
I
I
I
-- - 16 ---
~~~l',
~~~~i
I 13 11
12
2
~ ;-14
~---- 9
~10
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