Highlead GC20638, GC20638-D User Manual

Purchasing

Copy

Dept

HIGH

LEAD

GC20638/GC20638-D

Compound Split Needle

Sewing Machine

Bar

Feed Lockstitch

Instruction

Parts

SHANGHAI HUIGONG

N0.3

Catalog

SEWING MACHINE FACTORY

Manual

---

CONTENTS

---

Instruction Manual

1.

PREPARATION

1)

Latnp leads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2)

Connection

3)

Adjustment

2.

CAUTIONS

1)

Lubrication (1)

2)

Lubrication (2)

3)

Adjustment

4)

Condition

5)

Cautions

3.

OPERATION

1)

How to attach needle

on

FOR

OPERATION

of

control box

of

needle

ON

USE

........................................................................

of

oiling to rotating hook

of

oil lubrication

operation

.........................................................................

...............................................................

bar

stop position

...................................................................

..............................................................

...................................................................

......................................................

.....................................................

......................................................

1

1 2 2 2 2 2 3 3 3 3

2)

How to wind the lower thread

3)

Selection

4)

How to route the upper thread

5)

Adjustment

6)

Settingbobbin

7)

Threading

8) Tension adjustment

9)

Balance

10) Needle thread tension

11) Adjustment

12) Timing between rotating hook motion and needle motion

13) Adjustment

14)

Adjustment the needle stop position

15) Needle

16) Walking foot and presser foot vertical stroke adjustment

of

Thread

of

ofbobbin

of

thread tension

of

bar

stop position (left & right)

....................................................................

stitch length and reverse sewing

........................................................................

thread

ofbobbin

..................................................................

pressure

Feed dog height

of

...........................................................

............................................................

...............................................

..............................................................

threads

................................................................

presser foot

......................................................

....................................................

..........................................................

.......................................................

......................................................

......................................

.......................................

3 3 4 4 4 5 5 5 5 5 6 6 6 7 7

1

7)

Relationship between rotating

18) Relationship between hook motion and opener motion

19) Relationship between needle motion and feed dog motion

20) Safe clutch device

....................................................................

hook

motion and take-up lever motion

.........................................

......................................

............................

7 7 8 8

21) Adjustnlent

22) Installation

..........................................................................

of

movable knife

............................................................

9 9

Adjustnlent

23)

24) Adjustnlent

25) Adjustnlent

26) Sharpening

27) Adjustnlent for change ofneedle-to-needle distance

ofthread of of

of

trimmer threads tension release assembly scissoring pressure fixed knife

cam

......................................................

of

movable knife and fixed knife

..............................................................

.............................................

Parts Catalog

A,

ARM BED MECHANISM

B,

THREAD TENSION REGULATOR MECHANISM

C, ARM SHAFT*LOWER SHAFT MECHANISM

0,

PRESSER FOOT MECHANISM

E,

NEEDLE

F,

TOP FEED ROCK SHAFT MECHANISM

G,

LOWER SHAFT & FEED ROCK SHAFT MECHANISM

H, HOOK SADDLE MECHANISM

BAR

& TAKE-UP LEVER MECHANISM

.............................................................

............................................

.........................................................

................................................

........................................................

............................

.........................................

........................................

....................................

10 11 11 12 12

13 16 20 22 25 28

30 33

. L KNIFT MECHANISM ( 1)

J,

KNIFT MECHANISM (2)

K,

TOUCH BACK AND DETECTOR MECHANISM

L OIL LUBRICATION MECHANISM

J, ACCESSORIES

......................................................................

...............................................................

.............................................................

.....................................................

..........................................

35 37 40 42 45

2

1.

PREPARATION

1)

Lamp Leads

A.

When installing the illuminating lamp

FOR

OPERATION

(6V,

15-20W), The connecting wire is attached on the

back

of

the Control box. It should

and stripping properly. the wires.

be

removed and connected

The

wire connections should

by

removing the insulating tube from the wire

be,"

then, insulated

by

wrapping insulating tape on

CAUTION: The power switch must be turned off before connecting the lamp.

When the illuminating lamp is not used,

B.

the end

insulated as (a ) or (b) as shown in the figure on right side. occurs failing to insulate, the transformer

in the control burned out.

of

the lamp leads must

If

a short circuit

box

will

be

possibly

be

(a)

Lamp

Bare

leads

wire

(b)

lns~ating

(2

lnsl.daHng tape

(2

to

3

turns

\\fapped)

Lamp

to

3

turns

leads

CAUTION: The illuminating lamp must not be connected with any heater, such

warmer and others, in parallel. Otherwise, the load capacity will be exceeded.

transformer winding burned out.

C.

Rotary direction

tape

wrapped)

as

It

may cause

a foot

2)

Connection

The control

Note:

A.

B.

It

is

possible to change the rotary direction left side built-in lamp rotating counterclockwise as facing to the motor pulley, and on when rotating clockwise. The rotary direction has counterclockwise as facing to the motor pulley, matching with the machine prior to shipping.

of

the front cover on the control box, and in

the internal switch is

of

control box(Fig.l)

box

should

be

connected as shown to the right.

Be sure to turn the power switch off for safety before connecting or disconnecting the connectors.

The combination

panels are specified below. combination when replacing the machine head or motor

of

the machine heads with the motor control

Use special care for the correct

of

the motor

push

off

when the motor is

been

by

removing the rubber the internal direction selector switch. The

set to

cap

from the bottom

control panel.

-I-

Black

mark

DOWN

position

3)

Adjustment

A.

Adjust

If

a.

b.

c.

B.

Adjust

of

needle

of

"UP"

the marks deviate larger than 3 mm, adjust

Disconnect the plug (12 pins) machine head. Run the machine and stop at While holding the pulley, insert the "adjusting tool" in the hole

of

"Down" position: When the pedal is

bar

stop position(Fig.2,Fig.3)

position: When the pedal

of

cable from the

"UP"

position.

"A",

then remove the tool.

is

kicked down by heel, the machine stops at

as

follows.

®

"UP"

position.

Adjueting toll

"Neutral" the machine stops at "Down" position.

the marks deviate large than 5 a.

Disconnect the plug (12 pins)

b.

Run the machine and stop at "Down" position.

c.

While holding the pulley, insert the "adjusting tool" in the hole

C.

Confirm the stop operation, then set the plug (12 pings) coming from the machine head into the

receptacle.

mm,

adjust

as

follows.

of

cable from the machine head.

2.CAUTIONS ON USE

-1)

Lubrication

Pour oil During operation, check the oil level periodically, and in cases where the oil level is below position "L", replenish the oil supply Use white spindle oil.

(1

)(Fig.4)

up

to position

up

to position "H".

"H"

of

the oil tank.

If

"B",

then remove the tool.

2) Lubrication (2)(Fig.5)

When a new sewing machine used again, replenish a suitable amount

Note:

Lubricate

3) Adjustment

of

the

Hook

is

used for the first time, or sewing machine left out

of

oil

to

the portions indicated by arrow in the

Base everyday.

oiling to rotating hook( Fig.6)

-2-

of

use for a long time

fig.

is

4)

Condition of oil lubrication (Fig.5):

While operating the machine, check the condition

5)

Cautions on operation

A When the power is turned on or off, keep foot away from the pedal.

It

should be noted that the brake may not work when the power is interrupted or power failure occurs

B

during sewing machine operation.

C Since dust in the control

box cover close during operation.

D Do not apply a multimeter to the control circuit for checking; otherwise voltage

damage semiconductor components in the circuit.

box

might cause malfunction or control troubles, be sure to keep the control

of

oil lubrication through

the

3.0PERATION

1)

How to

Note: Before attach needle, be sure to Loosen the needle clamping screw; Hold the needles so that the two needles side with the long grooved (faces each other), and

attach

needle (Fig. 7):

tum

off the power.

oil check window.

of

multimeter might

as

insert it tighten screws.

2)

How to wind the lower

Strength

polyester thread,

Uneven winding: bobbin. Winding amount: When the bobbin wound insufficiently, tighten the adjusting screw.

3) Selection of

deeply as it will go into the needle clamping holes,

thread

of

winding: Particularly in the case

\Vind

the bobbin loosely.

If

the bobbin is wound unevenly, slide the thread guide toward the less wound portion

Thread

(Fig.9):

(Fig.S):

is

Thread

of

nylon or

wound excessively, loosen the adjusting screw. When the bobbin

guid

0

7

of

is

Even

winding

With

-

an amount

4/5

of

Fig.8

\/Vindlng

amount

adjusting screw

I

-·

fully capacny

3-

Fig.9

It

is recommended to use

right needle.

"S"

twist thread in the left needle (Viewed from front), and

"Z"

twist thread in the

When discriminate use "S"

twist thread as well as

4)

How to route the

A Pass each upper thread through thread guide A

Note: when thin slippery thread (polyester thread for example) thread guide

B With the take-up lever located at the upper most position, pass each thread in the order in

Note: Pressing the upper thread

A 8 A 8

of

needle thread

"Z"

upper

Bas

thread

show in Fig.lO

1s

impossible, use

twist thread can be used.

(Fig.lO,

Fig.ll):

lt:t~sening

button, the upper

tension releasing button

"Z"

twist thread in the needle. For bobbin thread,

is

used pass the thread through

thread

Needle thread

can be pulled out easily.

Fig.ll.

Lead the Lead the

thread thread

leftward rightward

5)

Adjustment

A Rotate the stitch length adjusting dial to change the stitch length B Pressing the stitch length adjusting lever for reverse stitching.

6)

Setting bobbin (Fig.13):

of

stitch length

and

reverse sewing (Fig.12):

Fig.ll

-4-

Leading the lower thread and install the bobbin

Pull out thread from side to

rotating hook, then replace hook shaft; Press the bobbin bar, leading the lower thread over bedplate.

7)

Threading

While holding the two needle Threads pulling up the needle threads, bobbin thread and needle thread should be aligned and led backward.

of

bobbin

A,

then install the bobbin

threads

(Fig.14)

by

as

shown in the figure, the bobbin threads will be lifted. Each combination

case,

Threading following

left hand, rotate the hand-wheel one turn

Tension adjusting screw

CD-®;

Put the bc,obin case

by

right hand. By

of

8) Tension

9)

Balance

10) Needle

Needle thread tension should be adjusted in reference to bobbin thread tension.

each tension adjusting nut. Needle thread tension can be also adjusted for special fabric and thread by changing

intensity and movable range

adjustment

of

thread

tension (Fig.16)

tension (Fig.17)

of

bobbin

To

adjust needle thread tension, tum

threads

of

slack thread adjusting spring.

(Fig.15)

AQ/"~33~

Balance tension

BX

~~~I~

E:=

Ti;h't needle or loose

bobbin tension

cx.<~----1

bobbin tension I Fig.l6

~---

~~-r~

}(-~·

1

! (

11)

Adjustment

A Pressure should be adjusted according to the material to be sewn.

of pressure

of

presser foot (Fig.18):

-5-

B Turning the pressure adjusting screw to adjust the pressure

of

presser foot

12) Timing between rotating hook motion

A Set stitch length to

B When needle is lifted 2.4mm from the lower dead point,

the following position relationship should be maintained:

a.

The upper edge

the hook point

b.

The hook point should be located at the center

needle axis.

c.

Gap between the hook point and the side face

needle should be 0.05 mm

13) Adjustment

Height with the following cautions: A Fabric will be damaged B Even stitch length cannot be assured

of

feed dog should be adjusted for individual fabrics

"6";

of

needle eye should be 2.3mm below

Feed dog height (Fig.20):

if

the feed dog extends too high or pressure

and

needle motion (Fig.19):

if

the feed dog

of

is

too low or

·--------~--------,

Gap between hook point and upper edge

LS~

.....

2.4rm1

needle

dead

Center needle

needle eye

,

..

\=:~~

from

___:.·

lower

point

of uis

of

presser foot is too large

of

pressure

C Feed dog height should be measured at the point where the needle

is at the top position. For light fabric: Approx For usual fabric: Approx l.Omm For heavy fabric: Approx 1.2mm

Adjustment procedure:

A Lay down the machine bed toward the other side; B Turn the balance wheel

of

needle place;

C Loosen the Screw and adjust the height

D After adjusted, tighten the screw.

The

feed dog height is

14) Adjustment the needle stop position (

A Loosen the needle bar Screw A;

presser foot is too small

0.8mm

by

hand stop when the feed dog

factory-adjusted

of

the feed dog;

to

1.2mm

00

21

):

w~I0.8mm

~11.0mm

1

a~m

I

1.2mm

I Fig.20

is

raise to its highest position from the surface

Needle

bar

screw

Needle

bar

Position

Needleclamp

screw screw

,__

A_.,.

o

B

~

~0

~

B Rotate the needle clamp B one circuit (amount

0.6mm), or loosen the needle bar screw of

half a circuit (amount

C Be sure

to

make the needle clamp facing left side, tighten needle bar screw C and A

Adjustment is 0.3mm)

C,

of

Adjustment is

rotate position screw D

-6-

Fig.21

15) Needle

bar

stop position (left & right) (Fig.19):

A Stop the motion

Make the stopper wrench to the position L

B Stop the motion

Make the stopper wrench to the position R

C

Two

needles running at the same time:

Return the needle bar

running:

restore to

16) Walking foot

of

left-side needle bar:

of

right-side needle bar:

of

left or right from standstill to

Press down restore plate, stopper wrench

0 position automatically

and

presser foot vertical stroke

adjustment (Fig.23):

When fabric with large elasticity is sewn, or when thickness fabric changes, the vertical stroke (movable range)

as

presser feet should be adjusted

A Loosen the special bolt;

B The vertical strokes

when the crank rod is moved downward and set;

follows:

of

presser feet become mtmmum

of

the

of

Special bolt Crank

Crank

rod

Fig.22

C The vertical strokes

when the crank rod is moved upward and set;

of

presser feet become mtmmum

D After the adjustment, tighten the special nut.

The

vertical

17) Relationship between rotating hook 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

as

adjusted

A Tum the balance wheel and stop when the take-up lever is

B Lean the machine head backward and make sure the arrow

C

follows:

to

lifted

(timing mark) put on the timing belt is in line with the black line on the boss If

the timing mark is not in line with the black line, remove

the timing belt and install it again to adjust.

strokes

its upper dead point.

of

presser

of

lower shaft bearing.

feet can be

adjusted

and

within a

range

from

2mm

to

6mm.

take-up lever motion (Fig.24)

Timing

belt

sprocker

Timing

Fig.24

mark

18) Relationship between hook motion

A Tum the balance wheel by hand and stop when the opener holder is located most remotely from the

and

opener motion (Fig.25)

-7-

throat plate.

Make sure gap between the bobbin case

B

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.

holder A and

Approx

0

2mm

19) Relationship between needle motion

and

feed dog

motion

A Set feed length to B Lean the machine head backward. (Fig.26) C Loosen the feed lifting rockshaft crank set screws A and B D Set the needle at the lowest position. Adjust the distance

between presser rod and vibration prevention rod and temporarily tighten the feed lifting rockshaft crank set screws A and B.(Fig.27) Check that the right feed lifting rockshaft crank is

E

connected with the link at right angle, If

F

the connection cover, loosen screw the right feed lifting rock shaft with the link at right angle.(Fig.28)

G After the completion

"0"

on the feed setting dial

as

shown in Figure.

is

not at right angle, remove the back

C and move the right link

of

adjustment, fully tighten the screws A , B and

to

connect

9mm

Fig.25

Feed

lifting

rock

shaft

crank

(middle)

A

B

Feed

shaft

lifting

crank

rock (right)

C.

dog

• At this time make certain that needle can enter the feed

Needle

rod

Vibration

prevention rod

needle hole at the center

Feed

lifting

rock

shaft

crank

(right)

Fig.27

20) Safety clutch device (Fig.21, Fig.22) :

Safety clutch device is installed to prevent the hook and cog belt from damage

of

the hole.

in

case the

-8-

thread

is

caught into the hook when the machine

A Function of safety clutch:

a.

When the safety clutch acts, the cog belt pulley will be unloaded. Then the rotation

of

hook shaft will

is

loaded abnormally operation.

Push

stop.

The

button

ann shaft only will rotate. Stop the operation machine.

b.

Clean the thread thoroughly which

is

hook.

c.

B

Turn the cog belt hub by hand, hook shaft rotates lightly

How

to set the safety clutch (Fig.29)

a.

While pressing down the push button on the

and

check whether the

properly, place the clutch device

opposite side of bed by left hand, turn the balance wheel slowly by right hand away from you;

b.

The balance wheel will stop by the gear plate, but

turn

the balance wheel more firmly;

c.

Release the push button, the safety clutch device is

set.

C Force applied to the safety clutch (Fig.30)

of

caught into the

White

Low

as

mark

Shaft

follows.

Eccentric

Set

Timing

Screw

Be~

Eccentric

Fig.29

Fig.30

a.

21)

Adjustment

The force applied center

of

b.

To

adjust the force slide the timing belt, loosen the set screw, and

c.

After

the

the lower shaft. The force proportionally increases

adjustment, tighten the set screw.

to

the safety clutch

is

the smallest when the mark

Screwing the pin that connects the link of back-sewing with the crank tolerance ofbetween the stitches. Screwing the pin in clockwise

Thread

can

mcrease the stitch

of

trimmer

roc~Jng

crank

forward sewing; otherwise, the stitch

of

back-sewing will be

increased.

22) Installation

of

movable

knife

of

ec<;,entric

as

the mark faces the outside;

turn

the eccentric pin;

of

back-sewing (down) can adjust the

pin faces the

-9-

Fig.31

A Installation

a.

Tum the balance wheel and lower the needle bar to the lowest position.

b.

Push the cam follower crank into the thread trimmer cam groove.

c.

Tum 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

e.

Adjust the movable knife

of

movable knife (Fig.31)

so

Monable knife

so

that the cam roller enters

B.

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.

B Gap between movable knife and bobbin case holder stopper (Fig.32)

a.

Tum 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

of

the movable knife reaches the extremity

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

its stroke.

0.5

mm (the screws A and B

should be loosened for this adjustment).

23) 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 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.

Green

mark

point

Cam

follower

crank

Cam

roller

Thread

trimmer

cam

-10-

Black

point

mark

Fig.33

Note:

24)

Adjustment

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

To

adjust, Loosen two thread trimmer cam clamp screws A

of

thread

needle

trilThller

threads

cam.

tension release assembly (Fig.34)

put

the cam roller into the groove

C Turning the balance wheel

when the white mark point on the balance wheel comes in line with the black mark point on the arm. To

D E

F Make fine adjustment by loosening the nut G Loosen the nut D and make the outer casing approach rightward to increase the opening value.

adjust, loosen two tension release cam clamp screws A Opening degree convex portion wire.

of

tension disc should be adjusted with the tension release roller B mounted on the

of

thread release cam,

by

hand, adjust the thread tension release

as

shown in Fig. To· adjust, loosen the screws C and draw the

D.

White

cam

so that the tension disc close

park

point

Thread

release

cam

'

Screw

C:

Nut

D

of

movable knife

and

fixed knife (Fig.35)

Fig.34

25)

Adjustment

Thread trimmer

cam

of

scissoring pressure

A Loosen the fixed knife bracket clamp bolt A

B Tum the vertical position adjusting screw B to adjust meshing pressure and then righter the hexagon

socket head cap screw A

to

Note: Since excess pressure causes large torque

trimming mechanism and trimming failure, adjust it that thread can be trimmed with minimum pressure.

C Move the movable knife and check that the thread can be

sharply trimmed.

the thread

so

Fig.35

-II-

26)

Sharpening

of

fixed knife

When the knives dull, the fixed shovld the movable knife, replace it with a

27)

Adjustment

for

change

of

needle-to-needle dishuu:e (Fig,37)

be

sharpened as illustrated in Fig. Since it is very difficult to sharpen

ne\V

one when it dulls (Fig.36).

A Replace the throat plate, feed dog and needle clamp. (Since

throat plate and feed dog are special parts designed for thread trimming machine, be sure to use those specified by us.)

B Lean the machine head backward.

C Loosen two connecting link clamp bolts D Remove the spring

M.

J.

E Loosen the hook bracket clamp screws A and B and adjust gap

between each needle and hook.

F When the needles and hooks have

been adjusted, install the spring

M.

G Contact the rocking cranks C and D

to the stopper pins tighten the connecting link clamp

J.

bolt

E and F and

Cnnner.tino

link

Hook

bracket

(left)

the

r

Lower

shaft

H Turn the balance wheel

the needles reach the lowest position. Loosen the nuts G and H.

J Depress the cam follower crank K and adjust the connecting rod L so that the cam roller can smoothly

enter the groove

of

by

band until

thread trimmer cam.

Screw B

Fig.37

Adjustment of the cam groove and the cam roller

A Push the cam follower crank K so that the cam roller enters into the cam groove.

cam

B Tum the connecting rod L and adjust the clearance between the

Las

small as possible, and tighten the nuts G and

C Push the cam follower crank K again and check that the cam roller enters into the thread trimmer cam

groove smoothly.

H.

roller and the cam groove surface

-12-

Highlead GC20638, GC20638-D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual