HIGHLEAD GC20518 Series User manual
HIGH
LEAD
GC20518 Series
Purchasing
Dept
Copy
Twin-Needl~
High Speed Lockstitch Sewing
Machine
Instruction
Manual
Parts Catalog
SHANGHAI HUIGONG
N0.3
SEWING
MACHINE
FACTORY
From the library of: Superior Sewing Machine & Supply LLC
From the library of: Superior Sewing Machine & Supply LLC
CONTENTS
PRECAUTIONS BEFORE STARTING OPERATION--------------------------------------1
PREPARATION
FOR
OPERATION
1.
Power cable connection
-----------------------------------------------------------------------2
2.
Connection
of
control box
----------------------------------------------------------------------3
3.
Adjustment
of
needle bar stop position
---------------------------------------------------------
3
CAUTIONS ON USE
1.
Oiling (
1)
---------------------------------------------------------------------------------------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
-----------------------------------------------------------------------6
3.
Selection
of
thread
------------------------------------------------------------------------------6
4.
Threading
of
needle threads
--------------------------------------------------------------------6
5.
Adjustment
of
feed (stitch) length and stitch reversing (touch-back) -----------------------------7
6.
Setting
of
bobbin
-------------------------------------------------------------------------------7
7.
Adjusting
of
needle thread guide
---------------------------------------------------------------7
8.
Threading
of
bobbin threads
---------------------------------------------------------------------8
9.
Tension adjustment
of
bobbin threads
---------------------------------------------------------8
10.
Balance
of
thread tension
-----------------------------------------------------------------------8
11.
Needle thread tension
---------------------------------------------------------------------------8
12.
Adjustment
of
presser foot pressure
------------------------------------------------------------9
13.
Timing between rotating hook motion and needle
motion----------------------------------------9
14.
Adjustment
of
feed dog
height-----------------------------------------------------------------
I0
15.
Relationship between rotating hook motion and take-up lever motion
------------------------
10
16.
Relationship between hook motion and opener motion
---------------------------------------
11
17.
Relationship between needle motion and feed dog motion
------------------------------------
11
18.
Installation
of
movable
knife-------------------------------------------------------------------
12
19.
Adjustment
of
thread trimmer cam
-----------------------------------------------------------
13
20. Adjustment
of
meshing pressure
of
movable knife and fixed knife
---------------------------
14
21. Sharpening
of
fixed knife
----------------------------------------------------------------------
14
22. Adjustment for change
of
needle gage
---------------------------------------------------------
15
23. Wiper
adjustment------------------------------------------------------------------------------
16
SPECIIfiCATIONS ------------------------------------------------------------------------------
17
PARTS CATALOG
1.
Arm bed
its
accessories
------------------------------------------------------------------------
18
2.
Thread tension regulator
mechanism-------------------------------------------------------'----
20
3.
Arm shaft & presser foot mechanism
----------------------------------------------------------
23
From the library of: Superior Sewing Machine & Supply LLC
From the library of: Superior Sewing Machine & Supply LLC
4.
Needle
bar
rocking
motion
mechanism
-------------------------------------------------------
26
5.
Stitch regulator
mechanism
--------------------------------------------------------
----------
28
6.
Lower shaft &
feed
rock
shaft
mechanism
-----------------------
----------
---
--------
-----
30
7.
Hook
saddle
mechanism
-
---
--
---
-----
---------------------------
------
--- -
---
-- 33
8.
Knife
mechanism
(
-~)
--
---
-
--
-
----------------------------------------
--
-
--
-
------
36
9.
Knife
mechanism
(
__:_)
--------
----
----
-------------------------------------------
-------
38
I0. Touch
back
mechanism
& detector
mechanism
------------------------------------------------
41
11. Wiper
mechanism
----------------------------------------------------------------------------
43
12. Oil lubrication
mechanism
--------------------------------------------------------------------
45
13. Accessories
----
----
--
--------------
---
--------------------------------------------
--------
48
GAUGE PARTS
LIAT
------- -------
--
----------------------------- -------------- -----------
51
From the library of: Superior Sewing Machine & Supply LLC
From the library of: Superior Sewing Machine & Supply LLC
PRECAUTIONS BEFORES STARING OPERATION
1.
Safety precautions
1)
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
off
when 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
removing 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
I) Ifthe machine's oil pan has an oil sump, never operate the machine
before
filling
it.
2)
If
the 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 pulley with the
power on. (the pulley should rotate counterclockwise when viewed
from
the pulley.)
4)
Verify the voltage and (single or three) 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
(SoC
or
lower). Otherwise, machine faifure may result.
2)
Avoid using the machine in dusty conditions.
Avoid using the machine
in
areas
where
too much electrical noise,
resulted
from the high-frequency
welder and others,
is
generated.
-1-
From the library of: Superior Sewing Machine & Supply LLC
PREPARATION
FOR
OPERATION
Overall
view
of
assembled
sewing machine
1. Power cable connection
1)
Connection
to
Power Supply
Balance
wheel
(included
synchronizer)
Control
box
When connecting the power supply connector to the control box, the connector should be completely
plugged in the proper receptacle after confirming the connector type and matching direction.
A. In case
of
three-phase electrical power system, the
"U"
phase should be connected to the red lead, the
"V"
phase to the white lead, and the
"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 terminal in order to ground the
motor properly.
B.
The appropriate power fuse capacity
is
as follows.
Power supply 200V-240V: 1
OA
100V-120V: 15A
2) Lamp Leads
A.
When installing the illuminating lamp
(6V,15-20W),The connecting wire
is
attached on the back
of
the Control box.
It
should be removed and connected by
removing the insulating tube from the wire
and stripping properly.
(a)
Bare
wire
Lamp
leads
-2-
(b)
Insulating
tape
(2
to
3
turns
wrapped)
Insulating
tape
(2
to
3
turns
wrapped)
Lamp
leads
From the library of: Superior Sewing Machine & Supply LLC
The wire connections should be, then, insulated by wrapping insulating tape on the wires.
CAUTION:
The
power switch
must
be Turned offbefore connecting
the
lamp.
B.
When the illuminating lamp
is
not used, the end
of
the lamp leads must be insulated as (a) or (b)
as
shown
in
the figure on right 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
others, in parallel. Otherwise, the load capacity will be exceeded.
It
may cause
transformer
winding
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 switch. The
built-in lamp
in
the internal switch
is
off
when 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 with the machine prior to shipping
2.
Connection
of
control
box
The control box should be connected
as shown to the right.
Note:
(I)
Be sure to turn the power switch
off
for safety before connecting
or disconnecting the connectors.
(2) The combination
of
the machine
heads with the motor control
panels are specified below.
Use special care for the correct
Operation
box
Round
hole
in
table
combination when replacing the machine head or motor control
panel.
3.
Adjustment
of
needle
bar
stop position
1)
Adjust
of
"UP"
position
When the pedal
is
kicked down by heel, the
machine stops at
"UP"
position.
If
the marks
deviate larger than 3 mm, adjust as follows.
a)
Disconnect the plug (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-
white mark
"UP"
position
Black mark "DOWN"position
From the library of: Superior Sewing Machine & Supply LLC
tool"
in
the hole" A", then remove the tool.
2)
Adjust
of"Down"
position
When the pedal is "Neutral" the machine stops at
"Down"
position.
If
the marks deviate large than
5 mm, adjust as follows.
a) Disconnect the plug (12 pins)
of
cable from
the machine head
b) Run the machine and stop at
"Down"
position.
c) While holding the pulley, insert the "adjusting @
tool"
in
the hole
"8",
then remove the tool.
3) Confirm the stop operation, then set the plug (12
pings) coming from the machine head into the
receptacle.
CAUTIONS ON USE
1.
Oiling (1)
Fill the oil reservoir with oil up to
"H"
mark.
Oil level should be periodically checked.
If
oil
level
is
found
below
"L"
level replenish oil to
"H"
level.
For
oil, Use white spindle
oill.
2.
Oiling (2)
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
the below figure
3. Oiling condition
"
. )
I
AIIOUnt
of
o i I
...
5-
6
drope
(I)
See dripping
of
oil during operation through the oil sight window to check oiling condition
in
the
-4-
From the library of: Superior Sewing Machine & Supply LLC
machine arm.
(2) Please use the oiling adjusting screw with
respect to oiling to take-up lever mechanism.
4. Adjustment
of
oiling to
rotating
hook
5.
Cautions 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
power
is interrupted or power
failure occurs during sewing machine operation.
Increase
i
c) Since dust in the control box might cause
____
__]
malfunction or control troubles, be sure to keep the control box cover close during operation.
d) Do not apply a multimeter to the·control circuit for checking; otherwise voltage
ofmultimeter
might damage semiconductor components
in
the circuit.
OPERATION
1. Installation ofneedles
Note: Before installing the needles,
be
sure to turn
off
the power.
Double
Needle
Insert
the
neodlo
upto
tho
bottom
of
noodle
clamp
and
tighten
tho
sc!'W
keeping
the
long
grove
side
of
needle
face
io
face
Long
groove
side
Insufficient
insertion
-5-
X
Needle
distorted
X
From the library of: Superior Sewing Machine & Supply LLC
2. Winding
of
bobbin thread
Note: When bobbin thread
is
wound, keep the presser foot lifted.
Adjustment:
Tension
of
wound thread
Conically wound thread
Length
of
wound thread
Slack winding
is
recommended for polyester thread and nylon thread.
Move the thread guide toward smaller diameter
of
wound thread layer.
Loosen the thread length adjusting screw to increase length
of
thread and tighten the screw to decrease length
of
thread.
3. Selection
of
thread
Winding
amount
ad)vst'lng
~crew
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 guide A
Thtetad
gcide
)(
0
Even
w1
fl<
h
ng
with
ami)<Hll
of
~:,l•.til
-:'ll()iltrty
Note: When thin slippery thread (polyester Thread or filament thread, for example)
is
used pass the
thread through thread guide B as well.
b)
With the take-up lever located at the upper most position, pass each needle thread in the order
shown in the following figure.
Note:
Pr_essing
the upper thread loosening button shown in the figure below opens the saucer
of
the
upper thread tension adjuster, and the upper thread can easily pulled out.
-6-
From the library of: Superior Sewing Machine & Supply LLC
Needle
threed
ten
..
ion
releasin4
button
5. Adjustment offeed (stitch) length
and
stitch reversing (touch
back)
Note:
To
make feed (stitch) length smaller, depress the feed reverse lever
and
set the feed length
6.
setting dial to a desired position
Touch-back button
...
Direction
of
stitching can be reversed by depressing this button.
Stitching goes on in reversed direction while the button
is
held down,
and
returns to forward
direction when the button is released.
feed
length
setting
dial
Setting
of
bobbin
a)
Pulling out S.cm thread tail from the bobbin.
b) Hold the bobbin so that the bobbin thread
is
would
in
right direction and put it into the hook.
__
...
.....--
,..<";:·
7.
Adjusting
of
needle
thread
guide
Please adjust needle thread guide
of
needle thread
tension according to sewing condition.
-7-
l
From the library of: Superior Sewing Machine & Supply LLC
Thread
Left
llfiddle
Richt
cui
de
p)
~)
~)
position
-o<«W«««
The
thicker
L The
thinner
llater
ial
•
then
II)
Stand-
than
standard
B
ard
standard
lleedl e
thread
llore
Standard
Less
supply
8.
Threading
of
bobbin
threads
(1) Put the hook into the bobbin case
and press down the latch
CD.
The thread end should be left on
the bed.
(2) While holding the two needle threads by left
hand, rotate the handwheel one turn by right
hand. By pulling up the needle threads, as
shown
in
the figure, the bobbin threads will
be lifted. Both
of
bobbin thread and needle
thread should be aligned and led backward.
9.
Tension
adjustment
of
bobbin
threads
11.
Needle
thread
tension
• Needle thread tension should be adjusted
in
reference
to bobbin thread tension.
•
To
adjust needle thread tension, turn each tension
adjusting nut.
• Needle thread tension can be also adjusted for special
fabric and thread by changing intensity and
movable range
of
slack thread adjusting spring.
-8-
10.
Balance
of
thread
tension
A 0
~
::~
]CIICII~
Balance tension
BX~~
lj~
I T(ght needle orloose
bobbin tension
cx2~~
r~n
neeae
or ngnt
bobbin tension
From the library of: Superior Sewing Machine & Supply LLC
12.
Adjustment
of
presser
foot
pressure
Pressure to fabric(s)
can
be adjusted by turning
The pressure adjusting screw.
13. Timing between
rotating
hook
motion
and
needle motion
(
1)
Set stitch length
on
the stitch length setting dial
shown table.
(2) When needle
is
lifted A
shown
table, from the
lowest positional, as shown in Figure, the
following positional ship should be maintained.
The upper edge
of
needle eye
should
be
l.0-1.6mm
below the
hook
point.
Class -M -B -H
Set the stitch 3 4.5 4.5
length
Needle
life A
2.2mm
2.4mm 2.4mm
Gap
between hook
point
and
The
hook
point should be located at the center
of
needle axis.
Gap between the
hook
point and the side face
of
needle should be 0.05mm.
"'"C~
:·::::
:::::.
.~
~:.::~
lower
dead
point
___:_.·
O.OSmm
. .
• Position
adjustment
of
hook
point
Adjust the
hook
point so that it
comes
to the center
of
needle axis.
(1) Lean the machine head
backward
and
loosen three
set screws
of
hook
shaft gear (small)
(2) Turn the balance wheel and stop
when
the needle
is
lifted A
mm
shown
table from
the
lowest position.
(3) Rotate the hook by hand to
position
the
hook
point to
the center
of
needle axis.
(4) Move the hook bracket leftward or rightward and posi-
~tion
it
so that gap between the
hook
point and side face
of
needle
is
0.05mm.For this adjustment, each screws
A, B and two
of
C should be loosened.
Note: In the adjustment, do not excessively loosen set
screws C and always maintain
meshing
of
hook
shaft
gear and lower shaft gear.
(5) Tighten the set screws
in
the following order:
a.
While pressing the lower shaft gear (large) against the
side face
of
hook
bracket,
tighten
the set screws C first.
b.
After checking gap between the needle and the hook,
-9-
Canter
of
needle
axis
From the library of: Superior Sewing Machine & Supply LLC
tighten the set screws A.
c.
Then tighten the set screws B.
• Position adjustment
of
needle point
Adjust needle position so that gap between the upper
edge
of
needle eye and the hook point
is
1.0-1.6 mm
when the needle
is
lifted by A mm from its lowest position
shown
in
before page.
(1) Remove the face plate, loosen the set screw
of
needle bar
· bracket and vertically move the bar to adjust.
(2) After the adjustment, tighten the set screw.
14. Adjustment
of
feed dog height
Height
of
feed dog and pressure
of
presser foot should
be
adjusted for individual fabric(s) with the following
cautions:
• Fabric will be damaged
if
the feed dog extends too high,
or pressure
of
presser foot is too large.
• Even stitch length cannot be assured
if
the feed dog
is
too low or pressure
of
presser foot
is
too small.
• Feed dog height should be measured at the point where
the needle
is
at the top position.
For light fabrics
......
Approx. 0.8mm from throat plate
For usual fabrics······Approx. l.Omm 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.
c) Loosen the feed bar set screw.
0.8mm
lmm
~WI:
l.2mm
d) Vertically move the feed bar (in the direction indicated by arrow in the figure) to adjust it to
adequate height.
e) After the adjustment, tighten the feed bar set screw.
• The feed dog height is factory-adjusted to l.Omm
15.
Relationship between rotating hook motion and take-up lever motion
-10-
From the library of: Superior Sewing Machine & Supply LLC
When the timing belt (toothed belt) was removed for
its replacement, for example,
the
relationship between
rotating hook motion and take-up lever motion should
be adjusted as follows:
a) Turn the balance wheel and stop when the take-up
lever
is
lifted to its upper
dead
point.
b) Lean the machine head
backward
and make sure the
arrow (timing mark) put on
the
timing belt is
in
Black
line
on
boss
of
line with the black line on
the
boss
of
lower shaft bearing.
lower
shaft
bearing
c) Ifthe timing
mark
is not in line with the black
line,
remove the timing belt and install it again to adjust.
16. Relationship between
hook
motion and
opener motion
a) Turn the balance wheel by
hand
and stop when
the opener holder is located
most
remotely from
the throat plate.
b) Make sure gap between the
bobbin
case holder A
and the opener is approximately 0.2mm.
Approx.
0.2mm
Timing
belt
sprocket
c) If the gap
is
too large or small , loosen the opener
set screw 8 and adjust position
of
the opener. A
Opener
Screw
Opener
holder
17. Relationship between needle motion and feed dog motion
• The feet dog should be adjusted so that the needle can plunge into
the
feed
dog
needle
hole at the center
of
the hole.
(
1)
Set stitch length to
"0"
on
the
stitch length setting dial
(2) Lean the machine head backward.
(3) Loosen the feed shaft
crank
set Screws A and 8
(4) Set the needle at the lowest position.
(5) Adjust the distance between
the
pressure bar and
the needle bar to be 13.5,
and
tentatively tighten
the screws A and 8
of
the feed shaft crank.
(6)
Check
that the right feed
shaft
crank
is
connected
with the link at right angle, as shown
in
Figure.
(7)
If
the connection is not at right angle, remove the
Feed
shaft
crari<
<middle)
Feed
shaft
crard<.
(r
i
gtrt)
back cover, loosen screw C and move the needle bar rocking rod
in
the
arrow direction to adjust.
-
11-
From the library of: Superior Sewing Machine & Supply LLC
(8) After the completion
of
adjustment, fully tighten the screws
A,
B and
C.
Needle
bar
I
I
I
I
18.
Installation
of
movable knife
(1)
Initial position
of
movable knife
a.
Turn the balance wheel and lower the needle bar to the lowest position.
rocking rod
b.
Push the cam follower crank so that the cam roller enters into the thread trimmer cam groove.
c.
Turn the balance wheel until the black mark point on the arm meets the white mark point on
the balance wheel.
Set the cam follower crank at this position with a screwdriver temporarily 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 movable 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 trimmer
rocking crank
rocking crank
-12-
From the library of: Superior Sewing Machine & Supply LLC
(2)
Gap
between movable knife
and
bobbin case
holder
stopper
a. Turn the balance wheel by hand until needle reaches the
lowest position.
b. With the needle at the lowest position, depress cam follower
crank, turn the balance wheel until the movable knife reaches
the extremity
of
its stroke.
c. Manually rotate the inner hook
in
the direction indicated by
arrow
in
Figure and adjust gap between the movable knife
and the inner hook stopper to about 0.2
mm
(the screws A and
B should be loosened for this adjustment).
19.
Adjustment
of
thread
trimmer
cam
.-------------------~-----.
Monable
knife
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
of
thread trimmer cam.
c. Turning the balance wheel by hand, adjust the thread trimmer cam so that the movable knife
starts moving
when the green mark point
on
the balance wheel comes in line with the black mark point on the arm.
•
To
adjust, loosen two thread trimmer cam clamp screws
A.
Cam
follower
Cam
roller
Thread
trimmer
cam
20.
Adjustment
of
needle
threads
tension release assembly
Green
mark
point
Black
mark
point
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
of
thread trimmer 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 arm.
To
adjust, loosen two tension release cam clamp screws A.
--
13
--
From the library of: Superior Sewing Machine & Supply LLC
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.
Thread
release cam I
Thread trimmer
cam ScrewC
Nut
D
White
park
point
21.
Adjustment
of
meshing pressure
of
movable knife and fixed knife
a.
Loosen the fixed knife bracket clamp bolt A.
b.
Turn the vertical 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 with minimum
pressure.
c. Move the movable knife and check that
the thread can be sharply trimmed.
22.
Sharpening
of
fixed knife
When the knives dull, the fixed should
be sharpened as illustrated in Fig.
Fixed
knife
bracker
Hexagon
socket
head
cap
screw
A
Ver-tical
position
adjusting
screw
B
Since
it
is
very difficult to sharpen the movable knife,
replace it with a
new
one when it dulls.
-14-
From the library of: Superior Sewing Machine & Supply LLC
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