HIGHLEAD GC0518-MC Instruction Manual

HIGH LEAD
Purchasing Dept
Copy
GC0518-MC/GC0518-MC-D
High Speed Needle Bar Feed Lockstitcher With Edge Cutter
And Automatic Thread Trimmer
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG N0.3 SEWING MACHINE FACTORY
From the library of: Superior Sewing Machine & Supply LLC

CONTENTS
l. PRECAUTIONS BEFORE STARTING OPERATION ...................... .
2.
MAIN SPECIFICATIONS .............. .
3 INSTALLING THE BELT.. . ............... .
4. ADJUSTMENT OF NEEDLE BAR STOP POSITION ......... .
5 LUBRICATION ..
6 CONDITION OF OIL LUBRICATION ..
7. LUBRICATION ADJUSTMENT..
8
ADJUSTMENT OF OIL PUMP ..... .
9. REGULAR CLEANING .......... .
l 0. WINDING ADJUSTMENT ............ .
ll REPLACE NEEDLES ....
12. THREADING .
13. SET STITCH LENGTH AND REVERSE FEEDING ..
14 ADJUSTING THE THREAD TENSION ..
15. UPPER THREAD TENSION ..
16. LOWER THREAD TENSION ..
17. ADJUSTMENT OF FEED DOG INCLINATION
18. ADJUSTMENT OF THREAD TRIMMER MECHANISM ..
19. INSTALLING OF THE NEDDLE PLATE .
20.
CLOTH CUTTING KNIFE ..
21 THROAT PLATE COVER.
22. OTHER REPLACEMENT PARTS..
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. ......... 2
. ....... 2
.3
. 3
. ....... .4
. ........ 4
. ......... .4
......... .4
. ........ .5
. ...... .5
. ......... 5
. ......... 6
. ....... 6
. ......... 6
. .......... 7
. .. . ... 7
......... 7
. .... 8
. .... 9
. ...... 9
. ......... 9
. ....... l0
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1. 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 balance wheel.
(2) Power must
be turned off when the machine is not in use, or when the operator leaves the seat
(3) Power must be turned off when 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 balance wheel, "V" belt, bobbin winder balance wheel,
or motor when the machine
is in operation.
(5) Do not insert fingers into the thread take-up cover, under/around the needle, or balance wheel
when the
machine
is in operation.
(6) If a belt cover, finger guard, eye guard are installed, do not operate the machine without these safety
devices.
2) Precautions before Starting Operation:
(1) 1f the 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 balance wheel with
the power
on. (The balance wheel should rotate counter-clockwise when viewed from the balance
wheel)
(4) Verify the voltage and (single or three) phase with those given on the machine nameplate.
3) Precautions for Operating Conditions:
( 1) Avoid using the machine at abnormally high temperature ( 35 OC or higher) or low temperature (5 OC or
]0\ver)
(2) Avoid using the machine in dusty conditions.
2. MAIN SPECIFICATIONS
Item GC0518-MC-D GC0518-MC
Material Light-Mediw11 heavy
Max.sewing speed 4500 rpm
Stitch length
0-4111111
Needle bar stroke 31.8nun
By hand 4nun
Presser By knee
lOnm1
Needle
DPX1#14
Lubrication Auto lubricated
Auto trinnner 0 -
Auto backtracking 0 -
Rotating hook Auto lubrication hook
(Thread trinuning) Auto lubrication hook
Motor Speed adj. Motor 370W clutch motor
-2-
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3. INSTALLING THE BELT (Fig.l)
1) Use a V-belt for sewing machine use, type M
2) To adjust the belt tension, change the motor
height
by turning the tension adjust nuts so that the
belt sinks about
15 nm1 when depressed by hand at
the center
of the belt span. If the tension is too low,
the speed may not
be consistent in the low or
medium range, or the needle may not stop in the
proper position.
If the tension is too high, the motor
bearings will deteriorate
more rapidly.
4. ADJUSTMENT OF NEEDLE
BAR STOP POSITION (Fig. 2, 3)
1) Adjusting 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
(l) Disconnect the plug (12 pins) of cable
fTom the machine head
(2) Run the
machine and stop at "UP"
position.
(3) While holding the balance wheel insert
the ''adjusting tool''
in the hole A, then
remove the tool.
2) Adjusting of "DOWN" position
Set the machine stops at "DOWN" position.
When the pedal
is kicked down by hell. the
machine stops
as "DOWN" position If the marks
deviate larger than 3
111111 adjust as follows
(I) Disconnect the plug ( 12 pins) of cable
from the machine head.
(2) Run the machine and stop at "DOWN"
position.
(3) While holding the balance wheel insert
the "adjusting tool"
in the hole 8, then remove the tool
B
Adjusting tool
/
_3rd mark
\ Rotating
I\ direction
.--- 1 st mark
2
3
3) Confirm the stop operation then the plug (1 2 pins) coming from the machine head into
the receptacle.
-3-
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5. LUBRICATION (Fig.4)
Pour oil up to position A of the oil tank.
During operation, check the oil level periodically,
and in cases where the oil level
is below position B
replenish the oil supply up to position
A.
Use white spindle oil.
6. CONDITION OF OIL LUBRICATION (Fig.S)
While operating the machine, check the
condition
of oil lubrication through the oil check
window.
7. LUBRICATION ADJUSTMENT
(Fig.6)
Adjusting the lubrication of rotating hook.
Oil adjusting screw (A) can adjust the
lubrication
of the rotating hook as follows:
(
1) Tum oil adjusting screw (A) clockwise to
increase oil and
tum oil adjusting screw (A)
counter-clockwise
to decrease oil.
(2) Oil adjusting screw (A) adjusts oil amount
within 5 turns When oil adjusting screw (A)
is fully
tightened. oil amount
is maximum.
(3) Readjustment depends
on temperature.
sewing speed and the like. In practice, oil amount
can
be judged as follows: remove the throat plate and
place a piece of paper on instead, run the machine for
about 20 seconds. then check the oil splashed on the
paper
8. ADJUSTMENT OF OIL PUMP
(Fig.7)
The standard adjustment is as follows The
Jdjusting plate keeps the bypass hole fully closed. To
decrease spbshing. open the bypass hole
appropriately
-4-
Oi I check window
~~
----------~-----~
l-Jf
A 6
7
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9. REGULAR CLEANING (Fig.S)
I) Cleaning feed dog
Remove the throat plate and clear offthe dust and lint between feed dog tooth slots.
2) Cleaning rotating hook
Swing out the machine head and clean
the hook. Wipe the bobbin case with soft cloth.
3) Cleaning oil pump, screen
Swing out the machine head and clear offthe dust and dirt on oil
plll11p screen.
Feed dog
10. WINDING ADJUSTMENT (Fig.9)
A----,
B---__,
E
I) The wound bobbin thread should be Peat and tight. if not. adjust the winding tension by turning tension
stud
nut (A) ofbobbin winder tension bracket.
Note: nylon or pol.r:;ter thread should be wound with little tension; otherwise. bobbin (D) might break or
defom1.
2) vn;. ~~ ·1 o vound thread layer does not present a cylindrical shape as shown in Fig 9 (a). loosen set screw
(1:5) of bobbin winder tension bracket and slide bracket (C) leftward or rightward. If thread is wound as shown in
Fig 9 (b). move the bracket rightward, but if thread is
\\Ound as shmvn in Fig 9 (c). move the bracket leftward.
After adequately positioning the bracket. tighten set
screw (B)
3) Do not overfill the boubin. The optimum length of
thread \Viii fill about 80'% of bobbin capacity This can be
adjusted by adjusting screw (E) of bobbin winder stop
latch
11. REPLACE N EEOLES (Fig.10)
Turn the balance wheel to lift needle bar to the upper
-s-
10
I ~
)J a
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end of 1ts stroke Loosen needle clamp screw (A). While keeping the long groove of the needle leftw·ard fully
insert the needle shank up to the bottom of the needle socket. Then tighten needle clamp scre'v\ (A)
Note Fig (b): insu!llcient insertion.
Fig (c) wrong direction
of long groove
12. THREADING (Fig.ll)
To thread the needle tlu·ead, raise needle bar to the upper end of its stroke, lead the thread from spool and
perform threading as shown
in Fig.3. To draw the bobbin thread, hold the end of the needle thread and turn the
balance wheel to lower the needle bar and then to lift it to its highest position. Pull the needle thread and the
bobbin thread is drawn
up. Put the ends of needle thread and bobbin thread front\vard under presser foot.
12
'"~
-~~-----·~Reverse lever
Stitch len~,~~-
adj ust ing Ji~l /I
13. SET STITCH LENGTH AND REVERSE FEEDING (Fig.12)
I) To change the stitch length, rotate the stitch length adjusting dial while pressing the push lever.
2) Press 1ng the reYcrse lc\ cr to rc\ crsc stitching.
3) The button switch can be pressed to perl'orm reverse stitching.
4) Normally, set the button switch as illustrated by the solid lines. To reverse stitching, press the button
S\Yitch
14. AD.JUSTING THE THREAD TENSION (Fig.l3)
0 X X
Wei I balanced The upper thread is The upper thread is
st1tch too tight or lower too loose or lower
thread is too I oose thread is too tight
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13
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15. UPPER THREAD TENSION (Fig.14)
1) The upper thread can be adjusted based on the
10\ver thread tension.
2)
Adjustment can be done by rotating the thread
tension
nut For special fabric sewing with special thread,
the desired tension can
be obtained by adjusting the
strength and operating range
of thread take-up spring.
16. LOWER THREAD TENSION (Fig.15)
I) The lower thread tension can be adjusted by
rotating screw A
•
•
14
Thread tension nut
~UHl~IA.~ //~/
17 ADJUSTMENT OF FEED DOG INCLINATION (Fig.16)
The feed dog has been set to standard
(horizontally) If necessary, adjust the inclination
according
to the material to be sewn as follows:
1) Sllghtly loosen screw A located in the feed
rock shaft crank
2)
Usmg a scre\\driver While pressing the
groove located in the eccentric shaft by using
a screwdriver. rotate the eccentric shaft
clockwise (to lift the front end) or
counter-clockwise (to lower the
rear end).
3) When adjustment is completed. tighten screw
A
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Pos1tion of rnark on the
eccentnc shaft
aB-
Honzontal
[)'
Up
[),
Down
Feed dog
t'NN,U,
Standard
~
Front up
(MAX)
J:i.!~'J
Front down
(MAX)
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18. ADJUSTI\1ENT OF THREAD TRIMMER J\;1ECHANISM
1) Thread trimmer mechanism as shown Fig.l7
Operation stroke of the thread tri1mner solenoid
(I) Standard operation stroke is 6. 0 mm
(2) This stroke can be adjusted by using nut A
IFIXed blade bracket un11/
Twrs1 spnng
1 Thread trnl1rner solenotd ur1d
~'
Thcead gu1cle ), ~ §
hxerl hi;:Hie "'-,
·,
Kn1fe base un1t I
/
/
/ I
Collar
A
Flexible wtre
Movable knde \left) Knde drtvlng Krn1e cinvrng
cr<Jnk Shed!
"' "...TWISt spnng
',.
Stopper
C:am follower
crank (1 I
(;:tl11 follower Dr~ve lever Stopper plate
crank (21
2) AdJustment of knife engagement (fig I R)
(I) Position of mm able knife (left) nnd fixed blade.
Sec the illustration. The standard distances from
the needle
center are 6.5 nnn and 3.3 mm from
the
movable knife (left) and fixed blade
respective!~.
(2) Adjustment of knife engagement With the
solenoid activated, turn on the machine. This
rotates the thread trimming
cam\\ hich rotates the
movable knife (left).
When the movable knife
(left) has
moved to its farthest distance, the
standard engagement
of the blade 1s 1.5-2 0 mm.
(3) Adjustment
of knife engaging pressure. If a
thread
is poorly cuL pmiicularly when it is thick,
slighth increase the engaging pressure. This
should soh c the problem The engaging pressure
can be adjusted in this \\ay: Loosen lock nut
B.
and adjust it b\ using adjusting sere\\ A.
-8-
1. 5-2.0mrn
Movable knife (left)
Movable knife (left)
3mm
Fixed blade
Fixed blade
18
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19. INSTALLING OF THE NEDDLE PLATE (Fig.19)
To attach the needle plate, bring the cloth-cutting knife to its lowest position, and gradually tighten the two
set screws alternately while lightly
pressing the needle plate onto the cloth-cutting knife.
20. CLOTH CUTTING KNIFE (Fig.20, 21)
l) Operation of the cloth cutting knife
(I) To actuate the cloth-cutting knife, press
down knife setting plate
1.
(2) To stop the cloth-cutting knife and reset the
machine to the normal lockstitching mode,
pull knob 2
in the direction of the arrow·
2) Attaching the cloth cutting knife
(I) Raise or lower the cloth-cutting knife so that
section A
of the cloth-cutting knife is
positioned 0-0.5 mm below the top face of
the needle plate when the knife is in its
lowest position.
(2) Loosen two knife set screws I. and replace
the cloth-cutting knife.
3) Changing the cutting width
(I) The needle plate decides the cutting width.
When the needle plate is replaced. loosen
knife
guiding shaft set screw I so that proper
'-------------~-----------~~---------------
parallelism is obtained and the sharpness of the knife blade is increased as shown in the ligure
(2) When the position ofthe knife is changed in accordance with the change of the needle plate size.
loosen set screw 2, and position the knife so that the blade of the needle platt comes in contact
with the knife blade. Then tighten
set screw 2.
(3) For the standard machine. a 3 2 mm wide needle plate is installed at the time of delivery
21. THROAT PLATE COVER
I) When the cloth-cuning knife is not in use. fit the throat plate cover. which is provided as an accessory.
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