Global WF-925 Parts list manual

GLOBAL
WF
925
(-AUT)
WF
926
(-AUT)
Instruction & Parts Manual
www.globalsew.com
[email protected]

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PARTS CATALOG
I. Arm bed its accessories ---------- - -- --------- ------------- ---------- -- ------------------------- 17
2. Thread tension regulator mechanism
--- - -- -------------------- -------- -- -------------------- -- - 19
3. Ann shaft mechanism --- ---- -- --- --------- ------------- - -- ------ -- ----- -- ---------------------- 22
4. Upper shaft & presser foot mechanism --------- ----------- ---- ------------ --- ---------------- 24
5. Needle bar & thread take-up lever mechanism -- ------------ -- ---------- - --- ------------- ----- 27
6. Stitch regulator mechanism -------- ---- - --------- ----- - ----- -- -- - ----------- -- ---------------- 30
7. Lower shaft & feed rock shaft mechanism
---------------- -- --- ------------------- - ------ ----- -32
8. Hooksaddle mechanism ------------ -- ---------- - ------ ---- -------- --- -- -------- -------------- 35
9. Knife mechanism ( I ) --- -- --- -- ------------- --------------- ---------------------- -- ------- -- 37
10. Knife mechanism (II) ------- -- -------------- ---- -- ----------- ------------------- ------ ------- 39
11. Touch back mechanism & detector m ec hanism --------------- ---------------- --------- -- --- -- 42
12. Oil lubrication mechanism -- ------- --------- ----- --------- -------- --- - ---- ----- ------------ --- 44
13 . Accessories ---- ----------------------------- ------- -------------- -- ---- ------ ---- ------ .- ---- -- 47
GAUGE PARTS LIAT ------------ - ---- -- ----- - ----- - -------------------- ---- - --- ---- -·------- - 50
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CONTENTS
PRECAUTIONS
BEFORE
STARTING
OPERATION
----------------
---------------------1
J>REPARAT
I
ON
FOR
OPERATION
I. Power cable connection
------------
--
------------------------------
----
-··---
------------------
2
2.
Connection
of
control box .------------· ---------------------~------------
----
-----·-----
-------
3
3. Adjustment
of
needle bar stop pos
it
ion --------------------------------------------------
--
---
--
3
CAUTIONS
ON
USE
1. Oiling (
l)
---
--
--------------------------------------------------------------------------
---
-----
4
2.
Oiling (2)
----
--
-----------
--
---
---------------- ·--
--
--------------
-------
---
-----------------
4
3.
Oiling condition -
--------------
----
---
--
--------------------------------- ·· ·· ··-.
--------
----
4
4.
Adjustment
of
oiling
to
rotating hook
--
----------
----
---------
---
------· · · · ·-· ·
------------
5
5.
Cautions on operation --------------------------------------------------· - -·-
··
-----
-
---
-----
5
OPERATION
1.
Installation
of
needles----------------------------------------------------- - -----
·-
··
......
_______
5
2.
Winding
of
bobbin thread
----
---------------------
----
-----------------
·-
-
--
-----------
--
- -
---
5
3.
Selection
of
thread
--------
-
----------------------
---------------------
-·
-·-
----
---------
----
---
6
4.
Threading
of
needle threads --------------------------------------
----
··-· --
..
-
---
-·
-----
----
-----
6
5.
Adjus
tm
ent
of
feed
(stitch) length and stitch reversing (touch-back) ----------------------------7
6. Setting
of
bobbin
______________________________________________________
......
____________
_
__
..
__
__
__
7
7. Threading
of
bobbin threads
--
---·----------------
-----
--------
--------
------'--------------------7
8. Tension adjustment
of
bobbin threads
----
-------
-----
--------
---
-------------------------------
8
9. Balance
of
thread tension
----------
--
-----------------------------------··--
--
----------
---
-----
8
I
0.
Needle thread tension
----
--
-..,---------------------
----
---------------------
----
------------
------
8
11.
Adjustment
of
presser foot pressure
--
----------------------------------
-----------------
-
------
8
, ,
12.
Timing between rotating hook motion and needle
motion
---------------
-------------
----
------
8
13
. Adjustment
of
feed dog height
----------
--------
----
-----------------------------------
--
------
9
I
4.
Relationship between rotatinghook motion
and
take-up lever motion ------------------------ I0
15.
Relationship between hook motion and opener motion -----
-------
--------------------------- I0
16.
Relationship between needle motion and
feed
dog
motion
------
-
----
-----
-·--
·---------------
--
I0
17.
Safety clutch device ------------------------------------------------------------------------
--
11
18.
Upper
feed
adjustment (needle side)
------------------------------------
-~
---
---------------
12
I9. Outside presser
foot
a
nd
inside press~r vertical stroke adjustment
-------
------------------
---
12
20. Adjustment
of
forward/backward stitch length
---
---
----------
--
------
-----
-------
-----
--
---
--
12
21. Installation
of
movable knife
-------------------
-----
----------
--
-----------------------
-
---
13
22.
Adjustment
of
thread trimmer
cam
----------------
--
------------------
-----
--
----------------
--
13
23.
Adjustment
of
needlethreads tension release assembly ------------------
--
---~-
----
---
----
----
14
24. Adjustment
of
scissoring pressure
of
movable knife and fixed knife
--------------------------
14
25. Sharpening
of
fixed knife-----
-------
--
-----------------------
-----
------------------------
--
--
15
26. Adjustment for change
of
needle
to
needle distance--------------------------------------------
15
SPECIFICATIONS
--------------------
--------
--
---
----
---------------------
-----
---------------
16
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,_
PRECAUTIONS BEFORE STARTING OPERATION
1.
Safety precautions
I)
When
turning the power on, keep your hands and
fingers
away
from
the area around/under
the
needle and the area around the pulley.
2) Power must be turned offwhen the machine
is
not
used,
or
when
the operator leaves his/her
seat.
3) The power must
be
turned offbefore tilting the machine
head,
installing or
removin
g
the
"V"
belt
,
adjusting the machine, or when replacing.
4)
Avoid
placing fingers, hairs,
bars
etc. near the pulley, "V"
belt,
bobbin
winder
pulley,
or
motor
when the machine
is
operation. Injury could result.
5)
Do
not insert
fingers
into the thread take-up cover,
under/round
the needle, or
pulley
when
the
machine is
in
operation.
6) If a belt cover, finger guard, and/or eye guard are installed,
do
not operate
the
machine
without
these safety devices.
2. Precaution before Starting Operation
1)
Ifthe machine's
oil
pan
has
an
oil
su
mp,
never operate
the
machine
before filling
it.
2)
Ifthe machine
is
lubricated
by
a drop oiler, never operate the
machine
before
lubricating.
3)
When
a new sewing machine is first turned on, verify
the
rotational
direction
of
the
pu\ley
with
the p_ower on. (the pulley should rotate counterclockwise
when
viewed
from
the
pulley.)
4)
Verify
the voltage
and
(si
ngle orthree) phase with those
given
on
the motor nameplate.
3.
~:
Precaution for Operating Conditions
1)
Avoid
using the machine
at
abnormally high temperature
(35°C
or higher) or
low
temperature
(5
°Cor lower). Otherwise, machine failure may result.
2)
Avoid
using the machine
in
dusty conditions.
3) Avoid using the machine
in
areas where too
much
electrical noise,
resulted
from
the
high-frequency
we
lder
and
others,
is
generated.
-
1-
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PREPARATION FO R OP E RATION
overa lI view of assembled
sewing machine
1. Power cable connection
Touch bac k
swich ·
1) Connection to PowerSupply
Balance whee l
(included synchron i zer)
pe servo motor
eptac l es for
Control box
When connecting the power supp ly connector to the control box, the connector shou ld be completely
plugged in the pr_ oper receptacle after confirming the conn ector typ e and matching direction.
A. In case of three-phase electrical power system, the "U" phas e should be connected to the red l ead,
the "V" phase to the white lead, and the '1 W" phase to the black lead. The motor rotary direction
depends, however, upon the setting of the internal switch in the control box as described in
Paragraph 1-(3)
CAUTION: The green wire must be connected to the ground termina l in o"rder to ground
the motor properly.
8. The appropriate power fuse capacity is as follows. Pow er supply 200V-240V: I0A
I00V-I20V: I5A
2) Lamp Leads
A. When installing the illuminating lamp(6V,I5-20W),T he conn ecti ng wire is attached on the
~------------------ -,
back of the Control box. It should be (b) Insulating tape
(2 to 3 turns wrapped)
removed and connected by
removing the insulating tube
from the wire and stripping
properly.
The wire connections
should be , then, insulated by
( a) Bare wi re
Lamp Ieads
- 2 -
Insu latin g Cut bare wire
tape (2 to
3 turns
wrapped)
Approx. 10mm
Lamp leads or more
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wrapping insulating tape on the wires.
CAUTION : The power sw itch mu st be Turned off before connecting the lamp.
8. When the il luminating lamp is not used, the end of the lamp leads must be insulated as (a) or (b) as
shown in the figure on dght side. If a short circuit occurs failing to insulate, the transformer in the
control box will be possibly burned out.
CAUTION: The illuminating lamp must not be connected with any heater, such as a foot
warmer and
ot hers, in parallel. Otherwise, the load capacity will be exceeded.
It may cause transformerwinding burned out.
3) Rotary direction ·
It is possible to change the rotary direction of the motor by removing the rubber cap from the
bottom left side of the front cover on the control box, and push the internal direction selector
sw i tch. The built-in lamp inthe internal switch is offwhen the motor is rotating counterclockwise as
facing to the motor pulley, and on when rotating clockwise. The rotary direction has been set to
counterclockwise as facing to the motor pulley, matching wi th the mach i ne prior to shipping
2. Connection of control box
The control box should be connected
as shown tothe right.
-• No t e: (I) Bes ur e fo turn the power sw itch
o
ff for saf ety before co nn ect ing
,,
or di sc onnecting the conn~ctors.
(i) The c~·mbina~ion of the mach in e
heads with the motor control
panels are
spec ified below.
Use
spec ial care for the correct .
Operat i on box
Round ho lo
in table
co mbination when replacing th e machine head or motor control panel.
3. Adjustment of needle bar stop position
I) Adjust of "UP" position
When the pedal is kicked down by heel, the
machine stops at
"UP" position. [f the marks
deviate larger.than 3
mm, adjust as fo ll ows.
a) Disconnect the pl ug (12 pins) of cable from
the machine head.
b) Run the machine and stop at "UP'' position.
c) While holding the
pulley, insert the "adjusting
- 3 -
wh~e mark " UP" position
Bl ack mark "DOWN"pos i tion
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tool"
in
the
hole" A", then remove
th
e
tool.
2)
A_djust of"Down"
pos
iti
on
When
the
pedal
is
"Neutral" the machine stops
at
"Down" position. Ifthe marks deviate
large
than
5
mm,
adjust
as
fo
ll
ows.
a)
Di
sconnect the plug(
12
pin
s)
of
cable
from
the
mach
i
ne
head
b)
Run
the machine
and
stop at "Down" position.
@
c)
While
ho
lding the
pulley,
insert the "adjusting tool"
in
the
hole
"B", then
remove
the
tool.
3) Confirm
the
stop operation, then set the
plug
(
12
pings)
coming
from
the
machine
head
into
the
receptacl
e.
CAUTIONS
ON
USE
1.
Oiling (1)
Fill
the
oil
reservoir with
oil
up
to
"H"
mark.
Oil
level
should
be
periodica
ll
y checked.
If
oil
level
is
found
below "L"level replenish
oil
to
"H"
leve
l .
For
oil, Use whi
te
s
pindl
e
oil
l.
2. Oiling (2)
Wh
en
a new sewing machine
is
used
for
the
first
time, or sewing machine left out
of
u,
se
for
considerably long
time
is
used
again, replenish a suitable amount
of
oil
to
the
port
ions indicated
by
arrow
in
the
below
figure
3.
Oili
ng
condition
See dripping
of
oilthrough the oil sight
hole
to
check oiling condition during operation.
-4-
....
,--;;:-;;~
~
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4. Adjustment of oiling to rotating hook
5. Ca utions on operation
a) When the power is turned on or off, keep
foot away
from the pedal.
b) It should be noted that the brake may not
work when the po wer is interrupted or power
fai lure occurs dl!ring sewing machine operation.
c) Since dust in the control box mightcause
malfunction or controltroubles,
be sure to keep the control box cover close during operation.
d) Do not apply a mu ltimeter to the control circuit for check in g; otherwise voltage of multimeter
might damage semiconductor components
in the circuit.
OPERATION
1. Installation of needles
No te : Before installing the needles, be sure to turn off the power.
Double Needle
l n10rt the needle upto tho bottom of nttdle clamp end Ughton !""'~cient
tho tcrtw hopingth• long grove oido of nudlt flu to flco ·· mo erlion
Needlo di.tolled
Single
Needlo
c::::::T
0
Long groove
tido
2. Win ding of bobbin thread
X I
:0
I
Long growo
loft lido
Note: When bobb in thread is wound, keep the presser foot lifted.
Ad
ju stment:
Tension of wound thread
Conically wound thread
Length
of wound thread
Slack winding is recommended
for po lyester thread
and nylon thread.
Move the thread guide toward
smaller diameter of
wound thread layer.
Loosen the thread length adjusting screw to increase length
-5 -
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of thread and tighten the screw to decrease length of thread.
~rg:" ~Iii ~ x
3. Selection of thread
Windingamount
&cljustin9 screw
It is recommended to use "S"twist thread in the left
needle (viewed
from front), and "Z'twist thread in the
right needle. When discriminate use of needle threads is
impossible, use "Z" twist thread in both the needles.
For bobbin thread, "S" twist thread as well as "Z" twist
thread can
be used.
4. Threading of needle threads
a) Pass each needle thread through thread guideA
Note:
When thin slippery thread (polyester Thread or
filament thread,
for example) is used pass the
thread through thread
gu i de B as well.
~ j~x
Ix
b) With the take-up lever located at the upper most positi on,
pass each needle thread in the order shown in the
following figure.
Note: Pressing the upper
thread loosening button
shown
in the figure be l ow
opens the saucer of the
upper thread tension
adjuster,
and the upper
thread can easily pulled
out.
Noodto thraodlonr.ion rek)asingbutton
Leod tho
thread
ktH werd,
-6 -
live,, wifl<hn9
with ;imr)1Jn( of
80% ;,I
1
:ill
~ll!Xltit•,•
(gl] , (µJI (Oo ta il I
GC20618-t •D
GC206 I8·2· 0
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5. Adjustment of feed (stitch) length and stitch reversing(touch back)
Note: To make feed (stitch) length smaller, depress the teed reverse lever and set the feed
length setting dial to a desired position
Touch-back button ... Direction of sti tch in g can be reversed by depressing this button.
Stitching goes
on in reversed direction while the button is held down, and returns to forward
d ir ection when the button is released..
feod lenglh
setting di al
· 6. Setting of bobbin
a) Pulling out 5.cm thread tail from the bobbin.
b) Hold the bobbin so that the bobbin thread is
would
in right direction and put it in to the hook.
-~•~'1: 1i1,·•,-
7. Threading of bobbin threads
a) Put the hook into the bobbin case and press down
the latch
CD .
The thread end should be left on the bed .
b) Whi le holding the two needle Th reads by left
hand, rotate the band-wheel one turn
by right
hand.
By pulling up the needle threads, as shown
in the figure, the bobbin threads will be lif ted.
Each combination of bobbin thread and needle
thread shou
ld be aligned and led backward.
- 7 -
-----
--
------
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8. Tension adjustment
of bobbin threads
Tension
adjusting
screw
10. Needlethread tension
• Needle thread tension should be adjusted in
reference to bobbin thread tension.
•
To adjust needle thread tension, tum each tension
adjusting
nut.
• Needle thread tension can be also adjusted for
special fabric and thread by changing intensity -a nd
movab le range of slackthread adjusting spring..
11. Adjustment of presser foot pressure
Pressure to fabric(s) can be adjusted byturning the
pressure adjusting-scr ew.
12 . Timingbetween rotating hookmotion and
needle motion
(1) Set feed length (stitch length) to "6" on the feed
setting dial.
(2) When needle is li fted 2.4mm from the lower dead
point, as shown in Figure, the following positional
relationship should be maintained.
•
The upper edge of needle eye should be
2.3mm be l ow the hook point.
• The hook point should be located
at the
center of needle axis.
•
Gap between the hook point and the side face·
ofneedle·should be 0.0, Smm.
-8 -
9. Balance of thread tension
AO?:::~
Balance tension
BX /==:::~ I 1 1;?
'~ht needle or loose
bobbi n tension
cx,2 «~
, ~~ ugn1
bobbin te ns i on
Gap between hook point and uppe r edge of needle eye
Needle lift:
2.4mm from
needle l ower
deed point
Cente rof
need le axia
0. 05mm
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II Positioning of hook point
(1) When the needle is at DOWN pos ition, the smaller
Crossed heli.cal gears on the right side and left side
should
be engaged with the large wheelso that the
"S" screw
of the former gearcomes on the front side,
and that of the lattergear on the reverse sid e.
(2) Tighten each "S" screw, where is punched for
set screw, on the hook shaft.
(3) Approximate position
of hook "C"screw of hook
should
be found close to the needle when the needle
is
at DOWN position.
~ To finely adjust timing between the needle motion and
hook motion, loosen the set screw
of largergear
wheel and move the gear wheel in its axial direction
wi
thi n a range from l mm to 2mm .
1 3. Adjustment of feed dog height
Height of feed dog and pressure of presser foot should
~
be adjusted for indiv idual fabric(s) wi th the following
cautions:
Fabric w
ill be damaged if t he feed dog extends too high,
·!-
1~
-· br pressure7 · ,of presser foot is too large.
Even stitch length cannot be assured if the feed dog is
too low orpressure of presser foot is too small.
• Feed dog heightshould
be measured atthe point where
the needle is
at the top pos 1tlon
For hght fabri
cs Approx. 0.8mm from i,'roat plat'
For usual fabrics Approx. I
.0mm from throat plate
For heavy fabrics Approx.
1.2mm from throat plate
Adjustment procedure
a) Lean the machine head backward.
b) Turn the hand wheel by hand and stop when the feed
dog rises to the maximum height
Loosen the feed barsetscrew.
......:-
l-2mm
},@
Need le DOWN
posit i on
--
1- 2mm
0, 8mm
1 mm
1.2mm
c)
d)
Verti c ally move the feed bar (in t he direction indicated by arrow in the figure) to ,, .!j us i it to .
adequate height.
- 9 -
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14.
e) After the adjustment, tighten the feed bar set screw.
~ The feed dog height is factory-adjusted to 1.2mm
Relationship between rotating hook
motion and take-up lever motion
When the timing belt (toothed belt) was removed for
its replacement, for example, th e relationship between
rotating hook motion and take-up lever motion should
be adjusted as follows:
a) Tum the balance
wheel and stop when the take-up
lever
is lifted to its upper dead point.
Black line on boss of
l ower shaft bearing
liming belt sprocket
b) Lean the machine head backward and make sure the arrow (timing mark) put on the timing belt is in
lire with the black line on the boss of lower shaft bearing.
c) If the timing mark is not in line with the black line ,remove the timing belt and ins tall it again to
adjust.
15. Relationship between hook motion
and
ope ner motion
a) Tum the balance wheel by hand and stop when
the opener holder is located most remotely from
the throat pl ate.
b) Make sure gap between the bobbin case holder A
and the opener is approximately 0.2mm.
c) If the gap is too large orsmall, loosen the opener
holder set screw B
and adjust position of the opener.
Approx. 0.2mm
16. Relationship between needle motion and feed dog motion
a) Set feed length to "O" on the feed setting dial
b) Lean the machine head backward.
c) Loosen the feed lifting rock shaft crank set screws A and B
A Ope n er Screw
Opener hd der
,-----------------,
d) Set the needle at the lowest position.
e) Adjust thedistance between presser rod and vibration
prevention
rod to 9mm and temporarily tighten the feed
lifting rock shaft crank set screws A and B
t) Check that the right feed lifting rock shaft crank is
connected with the link at right angle, as shown in Figure.
g) Ifthe connection
is notat right angle, remove the back
cover, loosen screw C and move the right link to connect
the right
feed lifting rock shaft with the l ink at right angle.
Link
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h) After the completion of adjustment, fully tighten the sc.ews ·, , B a· ' ,.
Q At this time make certain that needle can enter the
feed dog needle hole at the center of the hole.
I
I
~ ,:,---- '
9mm
17. Safety clutch device:
Needle rod
V lbration
prevention
rod
Safety clutch device is installed to prevent the hook
and cog belt from damage in case the thread is
caught into the hook when the machine is loaded ·
abnormally during·operation.
· '(lJ Function of safetyclutch.
f< ·a) When the safety clutch acts, the cog belt pulley will be
,
un loaded. theµ the rotation of hook shaft will stop.
Food llftlng rocK
shan cronk (rlghl)
The arm shaft only wilf rotate. Stop the operation of machine.
b) Clean the thread thoroughly which
is caught into the hook.
c)
Turn the cog belt hub by hand, and check whether the hook
Shaft rotates lightly
and properly, place .the clutch device as
follows.
(2) How to set the safetyclutch.
a) Whi le pressing down the push button on the opposite side
of bed by left hand, turn the balance wheel slowly by right
hand awayfrom you as shown
in the figure.
b) The balance wheel will stop by the gear plate,
but turn the balance wheel
more firmly.
c) Release the push button.
d)
As shown in the Figure, the safety elute~ device is set.
- 11 -
5-r
Safety clutch
/ -· ~ ~/ Cog bell p ulley
og belt h ub
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·-
..
(3)
Force
applied
to
the
safety
clutch.
a)
The force applied
to
the
safety clutch is the
smallest
when
the white
mark
of
the
eccentric
pin
faces
the center
of
the
lower shaft. The
W~le
mark
Timing
Bett
Eccentric
Pin
Stranglhan
Set
SCfew
.
force
proportionally increases as
the
white
mark
faces
the outside.
b)
To
adjust the
force
slide
the
timing belt,
loosen
the set
screw,
and
turn
the
eccent
ric
pin.
c)
After the adjustment,
make
sure
to
fasten
the set screw.
low
Shaft
Eccen~ic
Pin
Horizontal
shaft
crank,right
18. Upperfeed adjustment
(Needle side)
If
the uneven feeding occurs according
to
the
fabric,
Adjust the long hole
of
the horizontal
feed
shaft crank
(right) to adjust
the
upper
feed
length.
(How
to
adjust)
a)
Loosen the speci
al
bolt.
b)
Move
the
special bolt
upward
to
decrease
upper
feed.
Link
(Needle
bar
upper
rock
tink)
feed
inCfHUI
c)
Move
the
special bolt
downward
to
increase
th
e upper
feed.
The
upper
feed
and the
lower
feed
theoretically becomes
equal
at
the reference
lin
e
on
the
horizontal
feed
shaft crank.
d)
Securely tighten the special boltafter adjustment.
19. Outside presserfoot and inside presser vertical stroke adjustment
When
fabric
with
large,elasticity
is
sewn, or
when
thickness offabric changes, the vertical stroke
(movable range)
of
the presser feet should
be
adjusted
as
follows
:
Adjustment
Sp,ciol
bol
a)
Loosen the speci
al
bolt.
b)
The vertical strokes
of
the presserfeet
become
~
,•
.,
...
,
c)
maximum
when
the crank
rod
is
moved
upward
and
set. I
d) The vertical strokes becomes
minimum
when
the
nut
is
moved
downward and
set.
e)
After the adjustment, fully tighten the spec
ial
bolt.
C11nk1od
--
The vertical
strokes
of
the
presser feet
can
be
adjusted
within
a
ranc;e
from
6min
to
2mm.
20. Adjustment
Sc
rewin
g the pin that connects the link
of
back-sewing
with
the
crank
of
back
-se
wing
(down)
can
adjust the tolerance
of
between the stitches. Screwing the
pin
in
clockwise
can
increase the
stitch
of
forward sewing; otherwise, the stitch
of
back-sewing
will
be
increased.
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21. Installation of movable knife
( 1) Installation of movable kn ife
a. Turn the balance wheel and lower the needle bar to the lowest position.
b. Push the cam follower crank so that the cam roller enters into the thread trimmer cam groove .
c.
Turn the balance wheel unti l the black mark point on the arm miets the white mark point on the
balance wheel. Set the cam follower crank at this position with ascrewdriver temporari ly preventing
the cam roller coming out from the cam groove.
d. Loosen the thread trimmer rocking crank clamp bolts A and B.
e. Adjust the movable knife so that the movab le knife end slant portion protrudes
0-0.5 mm from the fixed knife, as shown in Figure and tighten the bolts A and B.
Thread lrimmar
rockingc,ank
T htaad ttimmar
tocking ctank
/i, (Z ):. ·, Gap bet.w~en mo va bl e kn ife a nd bobbin case holderstopper ,----- - -----'----.
. a.
Turn the balance wheel by hand until needle reaches the
Lowest position.
b.
With the needle atthe lowest position, depress cam follower
crank, turn the balance wheel
until the movable kn i fe reaches
the extremity
of its stroke.
c. Manually rotate the inner hook
in thedirection indicated by
arrow in Figure and adjust gap between the movable kni fe
Monable
knife
and the inner hook stopper to about 0.5 mm (the screws Aand Bshould be loose ned for th is
adjustment).
22 . Adjustment of thread trimmer cam
a. Turn the balance wheel by hand until the needles reach the lowest position.
b. Maintaining
the needle position, depress the cam follower crank and pu t the cam roller into the
groove of thread trimmer cam.
c. Turning the balance wheel
by hand, adjust the thread trimmer cam so that the movable knife sta.rts
moving when the green mark point on the balance wheel comes in line with the black mark point on
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the
arm.
Note:
To
adjust,
loosen
t " O
thread
trimmer
cam
·
lamp
screws
A.
Cam
f
ollowe
r
camro
ne
,
T
hread
trimmer
cam
23.
Adjustment
of
needle threads tension release assembly
Green
mark
point
Black
m
,1
1k
poin
t
a
Turn
the balance
wheel
by
hand
until
the needles
reach
the
lowest
position.
b. Maintaining the needle position, depress the
cam
follower
crank
and
put the
cam
roller
into
the
groove
•:
fthread tr:mmer
cam
.
c.
Turning
the balance
wheel
by
hand,
adjust the
thread
tension
release
cam
so that
the
tension disc
close
when
the white mark point
on
the balance
wheel
comes
in
line
with
the black mark point
on
the ann.
To
adjust, loosen
two
tension
r~
!i
aS(
'
cam
clamp
screws
A.
d. Opening degree
of
tension disc should
be
adjusted
with
the
tension
release roller B
mounted
on
the
convex portion
of
thread release cam,
as
shown
in
Fig
.
To
adjust, loosen the screws C
and
draw
the
wire.
e.
Make
fine
adjustment
by
loosening the
nut
D.
f.
Loosen
the
nut
D and
make
the outer casing approach
rightward
to
increase the opening
value.
CID
Thread
tendon
lever
Screw
Thread
release
cam
'
Thread
trimmer
cam
ScrewC
White
p!!lk
poi
nt
24.
Adjustment
of
scissoring pressure
of
movable knife and fixed knife
a.
Loosen the
fixed
knife bracket clamp bolt
A.
-
14
-
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b. Turn the ve,tical position adjusting screw B to adjust meshing pressure and then righter the hexagon
socket head cap screw A.
Note: Since excess pressure causes large
torque to the thread trimming mechanism
and trimming failure, adjust it so that
thread can
be trimmed wi th min i mum
pressure.
c.
Move the movable kn i fe and check that
the thread can be sharply trimmed.
Fixed kr,ife
bracker
Hexacor, socket h ead
cap gcrew A
Ve rt i ca l pos it i on adj u st in g screwB
25. Sharpening of fixed knife
When the knives dull, the fixed should be sharpened as illustrated
in Fig. Since it is very difficult to sharpen the movab le knife,
replace
it with a new one when it dulls.
26. Adjustment for change of needle-to-needle distance
(1) Rep lace thethroat plate, feed dog and needle damp.
(Since !he throat plate and·
feed dog are special parts designed
for thread:trimming machine,
be su re to use those specified by us.)
(2) Lean the machi ne head backward.
(3) Loosen tvfo, connecting link
clamp bolts j .
(4) Remove the spring M.
(5) Loosen the hook bracket clamp
screws Aand B and adjust gap
between each
need le and hook.
(6) When the needles and hooks have
been adjusted, install the spring M.
(7) Contactthe rocking cranks
Conn cc ling
link
ScrewA
Cam
roue,
sc,ewB
C and D to the stopper pins E and F and tighten the connecting link cl amp bolt J.
(8) Turn the ba lance wheel by band until the needles reach the lowest position.
(9) Loosen the
nuts G and H.
Cam lollower
crank·
(10) Depress the cam follower crank Kand adjust the connecting rod L so that the cam roller can
smoothly enter the groove
of thread trimmer cam.
(I I) Ad justment of the cam groove and the cam roller
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1. Push the cam follower crank K so that t he cam roller enters in to the cam groove.
ii. Turn the connecting rod Land adjust the clearance between the cam roller and th e cam
groove surface Las small as possible, and tighten the nuts G and H.
iii. Push the cam follower crank K again and check that the cam roller enters into the thread
trimmercam groove smoothly.
SPECIFICATIONS
Model WF9
25
WF926 WF 925 / AUT
WF 926/AUT
Number Single-needle Double-needle Single-needle Double-needle
Application
Heavy material
Max. sew _ing speed
2000(rpm)
Stitch length 0
,...., 9(mm)
Thread take-up lever
74.S(mm)
stroke
Needle-bar stroke
36(mm)
Presser-foot stroke l6(mm)
by Leg
8(mm) by hand
Vertical stroke of
upper feed
2......,6(mm)
Needle No. DPX
17 #23
Hook (Horizontal full-rotating)
Large
Thread take-up lever
Slide lever
Stitch adjusting
Dial
system
Lubrication system Automatic lubrication
Motor Clutch motor 370W I Servo motor
550W
Needle Standard 8_
(mm)
gauge Special 3.2 4
4.8
6.4
9.5 12.7 16 19
25.4(mm)
Note: ♦ Some materials, gauge sizes, and/orsewing conditions may require specifications otherthan
those listed above.
♦ Feed dog, throat plate, rotating hook, bobbin case and bobbin should be those desig ned for thread
timer.
♦ Bobbin should be of high quality free from deformation.
♦ This specification is subject to change for machine improvement.
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