Highlead GC20618-1E Instruction Manual
GC20618-1E
Heavy Duty Compound Feed Lockstitch
Sewing Machine With Edge Binder
Instruction Manual
Parts Catalog
CONTENTS
PRECAUTIONS BEFORE STARTING OPERATION ---------------------------------------------- 1
PREPARATION FOR OPERATION
1. Power cable connection -------------------------------------------------------------------------------------------- 2
2. C
onnection of control box -----------------------------------------------------------------------------------------
CAUTIONS ON USE
1. Oiling (1) -------------------------------------------------------------------------------------------------------------- 3
2. O
iling (2) --------------------------------------------------------------------------------------------------------------
3. O
iling condition -----------------------------------------------------------------------------------------------------djustment of oiling to rotating hook ---------------------------------------------------------------------------
4. A
autions on operation -----------------------------------------------------------------------------------------------
5. C
OPERATION
1. Installation of needles ----------------------------------------------------------------------------------------------- 4
2. W
3. T
4. S
5. T
6. Tension adjustment of bobbin threads --------------------------------------------------------------------------- 6
7. B
8. N
9. A
10. T
11. Adjustment of feed dog height ------------------------------------------------------------------------------------ 7
12. R
13. R
14. R
15. S
16. Upper feed adjustment (needle side) ---------------------------------------------------------------------------- 10
17. O
inding of bobbin thread ------------------------------------------------------------------------------------------
hreading of needle threads ---------------------------------------------------------------------------------------
etting of bobbin ---------------------------------------------------------------------------------------------------hreading of bobbin threads ---------------------------------------------------------------------------------------
alance of thread tension -----------------------------------------------------------------------------------------eedle thread tension ----------------------------------------------------------------------------------------------djustment of presser foot pressure ------------------------------------------------------------------------------
iming between rotating hook motion and needle motion ---------------------------------------------------
elationship between rotating hook motion and take-up lever motion -----------------------------------elationship between hook motion and opener motion -----------------------------------------------------elationship between needle motion and feed dog motion --------------------------------------------------
afety clutch device -------------------------------------------------------------------------------------------------
utside presser foot and inside presser vertical stroke adjustment ----------------------------------------
3
3
4
4
4
5
5
6
6
6
6
7
7
8
8
8
9
10
SPECIFICATIONS ------------------------------------------------------------------------------------------------- 10
PRECAUTIONS BEFORE STARTING 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
ower must be turned off when the machine is not used, or when the operator leaves his/her seat.
2) P
3) The power must be turned off before tilting the machine head, installing or removing the “V” belt,
djusting the machine, or when replacing.
a
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
o not insert fingers into the thread take-up cover, under/round the needle, or pulley when the
5) D
machine is in operati
6) I
f a belt cover, finger guard, and/or eye guard are installed, do not operate the machine without
these safety devices.
on.
.
.
2. Precaution before Starting Operation
f the machine’s oil pan has an oil sump, never operate the machine before filling it.
1) I
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 wit
the power on. (the pulley should rotate counterclockwise when viewed from the pulley.)
h
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℃ or higher) or low temperature
(5℃or lower). Otherwise, machine failure may result.
2) Avoid using the machine in dusty conditions.
void using the machine in areas where too much electrical noise, resulted from the
3) A
high-frequency welder and others, is gener
ated.
— 1 —
PREPARATION FOR OPERATION
Overall view of assembled
sewing machine
1． Power cable connection
1) Connection to Power Supply
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
he “V” phase to the white lead, and the “W” phase to the black lead. The motor rotary direction
t
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
he appropriate power fuse capacity is as follows. Power supply 200V-240V： 10A
. T
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. The wire connections
,
should be, then, insulated by
wrapping insulating tape on the wires.
CAUTION: The power switch must be Turned off before 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
— 2 —
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
I
t 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 t
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: (1) 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
combination when replacing the machine head or motor control panel
CAUTIONS ON USE
o
.
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 oil
.
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 —
3.
Oiling condition
See dripping of oil through the oil window to check oiling condition during operation.
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.
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 of multimeter might
damage semiconductor components in the circuit.
OPERATION
1． Installation of needles
Note: Before installing the needles,
be sure to turn off the power.
— 4 —
2． Winding of bobbin thread
Note: When bobbin thread is wound, keep the presser foot lifted. Adjustment:
Tension of wound thread Slack winding is recommended for polyester threadand nylon thread.
Conically wound thread Move the thread guide toward smaller diameter of wound thread layer.
Length of wound thread Loosen the thread length adjusting screw to increase length of thread and
tighten the screw to decrease length of thread.
.
3． Threading of needle threads
a) Pass each needle thread through thread guide A
Note: When thin slippery thread (polyester Thread or filament thread, for example) is used pass the
thread through thread guide B as well
ith the take-up lever located at the upper most position, pass each needle thread in the order
b) W
shown in the following figure.
Note: Pressing the upper thread loosening button shown in the figure below opens the saucer of the
upper thread tension adjuster, and the upperthread can easily pulled out.
.
— 5 —
4． Setting of bobbin
a) Pulling out 5cm 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.
5． Threading of bobbin threads
a) Put the hook into the bobbin case and press down the latch ①. The thread end should be left on
the bed .
b) While holding the needle Thread by left hand, rotate the hand-wheel one turn by right hand.
By pulling up the needle thread, as shown in the figure, the bobbin thread will be lifte
Each combination of bobbin thread and needle thread should be aligned and led backward.
6. Tension adjustment of bobbin threads 7. Balance of thread tension
d.
8. 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
·N
eedle thread tension can be also adjusted for special fabric and thread by changing intensity a
ovable range of slack thread adjusting spring.
m
— 6 —
.
nd
9. Adjustment of presser foot pressure
Pressure to fabric(s) can be adjusted by turning the pressure adjusting screw.
10． Timing between rotating hook motion and
needle motion
(1) Set feed length (stitch length) to “6” on the feed
etting dial.
s
(2) When needle is lifted 2.4mm from the lower dea
poi
nt, as shown in Figure, the following positiona
elationship should be maintained.
r
· The upper edge of needle eye should be 2.3mm
below the hook point
The hook point should be located at the center of needle axis.
·
· Gap between the hook point and the side face of needle s hould be 0.05mm
.
d
l
.
11． Adjustment of feed dog height
Height of feed dog and pressure of presser foot shouldbe 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. 1.0mm 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.
c
) Loosen the feed bar set screw.
d) V
e) After the adjustment, tighten the feed bar set screw.
ertically move the feed bar (in the direction indicated by arrow in the figure) to adjust it to
adequate height
The feed dog height is factory-adjusted to 1.2mm
.
— 7 —
12． Relationship between rotating hook
motion and take-up lever motion
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 line 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 install it again to
adjust.
13． 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.
c) If the gap is too large or small , loosen the opener
holder set screw B and adjust position of the opener.
14． Relationship between needle motion and feed dog motion
a) Set feed length to “0” on the feed setting dial
b) Lean the machine head backward.
c) Loosen the feed lifting rock shaft crank set screws A and B.
d) Set the needle at the lowest position.
e) Adjust the distance between presser rod and vibrati
prevention rod to 9mm and temporarily tighten the feed
lifting rock shaft crank set screws A and B
f) Check that the right feed lifting rock shaft crank is
connected with the link at right angle, as shown in Figure.
g) If the connection is not at right angle, remove the back cover, loosen screw C and move the right link
.
on
to connect the right feed lifting rock shaft with the link at right angle.
h) After the completion of adjustment, fully tighten the screws A , B and C.
At this time make certain that needle can enter the feed dog needle hole at the center of the hole.
— 8 —
15． Safety clutch device:
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.
(1) Function of safety clutch.
a) When the safety clutch acts, the cog belt pulley will be
unloaded. then the rotation of hook shaft will stop.
The arm shaft only will 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 safety clutch.
a) While pressing down the push button on the opposite side
of bed by left hand, turn the balance wheel slowly by
right hand away from 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 clutch device is set.
(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 force proportionally
increases as the white mark faces the outside.
— 9 —
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