HIGHLEAD GC24698-2B User manual

HIGH LEAD
Purchasing Dept
Copy
GC24698-2B/-BL/-BR
Super Post Bed Compound Feed Lockstitch Sewing Machine
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG N0.3 SEWING MACHINE FACTORY

--- CONTENTS ---
Instruction Manual
• Preparation for operation .............................................................. 1
l, Safety precautions ..................................................................... 1
2, Precautions before starting operation ....................................................... 1
3, Precautions for operating conditions ....................................................... 1
• Cautions on use ...................................................................... 1
1, Lubrication ( 1) ........................................................................ 1
2, Lubrication (2) ........................................................................ 1
3, Condition of oil lubrication .............................................................. 1
4, Cautions on operation .................................................................. 2
• Oper·ation ........................................................................... 2
l, How to attach needle ................................................................... 2
2, How to wind the lower thread ........................................................... 2
3, Selection of Thread .................................................................... 3
4, How to route the upper thread ............................................................ 3
5, Adjustment of stitch length and reverse sewing ............................................... 4
6, Setting bobbin ........................................................................ 4
7, Threading of bobbin thread .............................................................. 4
8, Balance of thread tension ................................................................ 4
9, Lower thread tension ................................................................... 4
10, Upper thread tension .................................................................. 4
11, Adjustment of pressure of presser foot .................................................... 5
12, Timing between rotating hook motion and needle motion ...................................... 5
13, AdjustmentofFeeddogheight .......................................................... 5
14, Walking foot and presser foot vertical stroke adjustment ...................................... 6
15, Safety clutch device ................................................................... 6
16, Installation of Belt cover ............................................................... 7
Specifications ............................................................................ 7
Parts Catalog
A, ARM BED AND ITS ACCESSORIES ..................................................... 8
B, THREAD TENSION REGULATOR MECHANISM ......................................... 10

C ARM SHAFT MECHANISM ........................................................... 13
D, UPPER SHAFT & PRESSER FOOT MECHANISM ......................................... 15
L TAKE-UP THREAD AND SHAFT MECHANISM .......................................... 18
F, STITCH REGULATOR MECHANISM ................................................... 21
G, LOWER SHAFT & FEED ROCK SHAFT MECHANISM .................................... 23
H, HOOK SADDLE MECHANISM ........................................................ 26
I, OIL LUBRICATION MECHANISM ..................................................... 30
J, ACCESSORIES ...................................................................... 33

II Preparation for 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 offwhen 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 pulley,
"V" belt, bobbin winder pulley, or motor when the
machine
is in operation.
5)
Do not insert fingers into the thread take-up cover, under/around the needle, or pulley 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) Never operate the machine before filling the machine's oil pan.
2) When a new sewing machine is first turned on, verify the rotational direction of the pulley with the
power on.
3) Verify the voltage and phase (single or three) with those given on the machine nameplate.
3. Precautions for operating conditions:
l) Avoid using the machine at abnormally high temperatures ( 35 'C or higher) or low temperatures ( 5 'C or
lower)
2) Avoid using the machine in dusty conditions.
II Cautions on use:
l. Lubrication (1) (Fig.I)
Pour oil up to position "H" of the oil tank.
During operation, check the oil level periodically, and in cases
where the oil level
is below position "L", replenish the oil supply up to
position ''H".
U~.: white spindle oil.
2. Lubrication (2) (Fig.2a, Fig.2b)
When a new sewing machine is used for the first
time, or sewing machine left out
of use for a long time is
used again, replenish a suitable amount of oil to the
portions indicated by arrow in the fig.
Note:
Lubricate the Hook Base everyday.
3. Condition of oil lubrication (Fig.3):
-I-
0
Fig.2a

While operating the machine, check the condition of oil lubrication through the oil check window.
4. Cautions on operation
1) When the power is turned on or off, keep foot away from the pedal.
2) It should be noted that the brake might not work when the power is interrupted or power failure occurs during
sewing machine operation.
3)Periodically clean the machine.
• Operation
1. How to attach needle (Fig.4):
Note: Before attach needle, be sure to turn off the power.
1) Turn the balance wheel by hand to raise the needle bar to its highest
position;
2) Loosen the needle clamping screw;
3) Hold the needles so that the two needles side with the long grooved
(faces each other), and insert it as deeply as it will go into the needle
clamping holes( model GC24698-2B);Hold the needle to its side with the
long groove side(left),then insert the needle as deeply as it will go into the
needle clamping hole(model GC24698-BL!BR).
4) Tighten the needle clamping screw.
2. How to wind the lower thread (Fig.5):
GC24698-BL/BR GC24698-2B
Strength of winding: Particularly in the case of nylon or polyester thread, wind the bobbin loosely.
Uneven winding: If the bobbin is wound unevenly, slide the thread guide toward the less wound portion of
bobbin.
Winding amount: When the bobbin is wound excessively, loosen the adjusting screw. When the bobbin is wound
-2-

insufficiently, tighten the adjusting screw.
Winding tension
adjusting screw
"-. Thread guid
Winding amount
adjusting screw
3. Selection of Thread (Fig.6) :
I
u u
0
Even winding
an amount 4/!
fully capacity
Fig.5 Fig.6
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 thread is impossible, use "Z" twist thread in the needle. For bobbin thread,
"S" twist thread as well as "Z" twist thread can be used.
4. How to route the upper thread (Fig.7, Fig.8):
l) Pass each upper thread through thread guide A
Note: when
thin sli11pery thread (polyester thread for example) is used pass the thread through thread
guide B as show in Fig.7
2) With the take-up lever located at the upper most position, pass each thread in the order in Fig.8.
Note:
Pressing the upper thread loosening button, the upper
thread can be pulled out easily.
A B A B A
Fig.7
Lead the
thread
leftward
-3-
Lead the
thread
rightward
Fig.8

5. Adjustment ofstitch length and reverse sewing (Fig.9):
1) Rotate the stitch length adjusting dial to change the stitch length
2) Pressing the stitch length adjusting lever for reverse stitching.
6. Setting bobbin ( Fig.10 ):
Dial
~
~Feed reverse
lever
-----
Fig.9
1) Pulling out 5cm thread tail from the bobbin;
2) Hold the bobbin so that the bobbin thread is would in tight direction and put it into the hook.
7. Threading of bobbin thread (Fig.11, Fig.12):
1) Flap down the latch lever, from the slit 1 of the hook, pass the thread through underneath of the hook
body 2, pull the thread outside (Fig.11);
2) While holding the needle thread by left hand, rotate the hand wheel one tum by right hand. By pulling
·up the needle thread, the bobbin thread will be lifted. Close the slide plate (Fig.12)
A 0 _..-->-:::~· & .. ?
t =--=--===-
Bal once tension
BX~-----·~
~ ~h'I needle or loose
bobbin tension
IFig.13
8. Balance of thread tension (Fig.13):
9. Lower thread tension (Fig.14):
There is virtually no need to adjust the lower thread tension, except for special kind of the fabrics or thread.
when slight adjustment will be necessary.
Turning the screw I clockwise will increase the tension of lower thread, otherwise, the tension of lower
thread will decrease. (Fig.14).
10-. Upper thread tension (Fig.15):
-4-

1) The upper thread can be adjusted based on the lower thread
tension.
2) Adjustment can be done
by rotating the thread tension nut.
11. Adjustment of pressure of presser foot
(Fig.16):
1) Pressure should be adjusted according to the material to be
sewn.
2) Turning the pressure adjusting screw to adjust the
pressure
of presser foot
12. Timing between rotating hook motion
and needle motion (Fig.17):
~--
1) Set stitch length to "6";
2) When needle is lifted 2.4mm from the lower dead
point, the following position relationship should be
maintained:
l
~~r~
,~.
I1 (
Figl5
• The upper edge of needle eye should be 2.3mm
below the hook point Gap between hook point and upper edge
of
needle eye
• 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 0.05 mm
13. Adjustment of Feed dog height (Fig.18):
Height of feed dog should be adjusted for individual fabrics with
the following cautions:
1) Fabric will be damaged if the feed dog extends too high or
pressure
of presser foot is too large
2) Even stitch length cannot be assured
if the feed dog is too
low or pressure
of presser foot is too small
needle lower
dead point
Center of
needle axis
3) Feed dog height should be measured at the point where the needle is at
the
top position.
For light fabric: Approx 0.8mm
For usual fabric: Approx l.Omm
For heavy fabric: Approx l.2mm
Adjustment procedure:
1) Lay down the machine bed toward the other side;
2) Turn the balance wheel by hand stop when the feed dog is raise to its
highest position from the surface
of needle place;
3) Loosen the Screw and adjust the height
of the feed dog;
-5-
w~08mm
~
07
11omm
@~'Iii f 1.2mm
r Fig 18

4) After adjusted, tighten the screw.
The feed dog height is factory-adjusted to 1.2mm
14. Walking foot and presser foot vertical stroke adjustment (Fig.19):
When fabric with large elasticity is sewn, or when thickness of
fabric changes, the vertical stroke (movable range) of the presser
feet should be adjusted as follows: Special bolt Crank
1) Loosen the special bolt;
2) The vertical strokes of presser feet become maximum when
the crank rod is moved downward and set;
3) The vertical strokes
of presser feet become minimum when
the crank rod is moved upward and set;
4) After the adjustment, tighten the special nut.
The vertical strokes ofpresser feet can be adjusted within a
range from 2mm to 6mm.
15. Safety clutch device (Fig.20, Fig.21)
Crank 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 operation.
1) Function ofsafety 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 (Fig.20)
Push
button
Fig.20 Fig.21
A. While pressing down the push button on the opposite side of bed by left hand, tmn the balance ''heel
slowly by right hand away from you;
B. The balance wheel will stop by the gear plate, but t11m the balance wheel more firmly;
C. Release the push button, the safety clutch device is set.
3) Force applied to the safety clutch (Fig.21)
A. The force applied to the safety clutch is the smallest when the mark of eccentric pin faces the center of
the lower shaft. The force proportionally increases as the mark faces the outside;
B. To adjust the force slide the timing belt, loosen the set screw, and tum the eccentric pin:
C. After the adjustment, tighten the set screw.
-6-