HIGHLEAD GC20698-6 Manuale utente

Compound-Feed, Heavy Duty Lockstitch Sewing

Machine

GC20698-5/-6/-7/-8

Instruction Manual

Parts Catalog

HANGHAI BIAOZHUN HAILING SEWING MACHINERY CO., LTD

—INDEX—

OPERATION INSTRUCTION

1. PRECAUTIONS BEFORE STARTING OPERATION ……………………..…………………..……….....1

2. SPECIFICATIONS .……………………………………………………………………………...….………1

3. SETTING UP THE MACHINE………………………...…………………………………………....………2

4. OILING…………………………………………………………………………………………….….……...2

5. NEEDLE…………………………………………………………………………………………….….…….3

6. THREAD……....…………………………………………………………………………………….…….…4

7. WINDING THE LOWER THREAD ON THE BOBBIN……………………………………………………4

8. REMOVE AND INSERT THE BOBBIN……………………………………………………..…….…….…4

9. THREADING THE NEEDLE….……..………………………………………………...………………....…5

10. REGULATING THE THREAD TENSION…...………………………………….………………….………5

11. ADJUSTMENT OF THE STITCH LENGTH..…………………………………………………….…..……6

12. ADJUSTMENT OF THE PREESURE ..…………………………………………………….…..…………..6

13. REVERSE STITCH……………………………………….………………………………………….....……6

14. WIDTH OF ZIGZAG AND LENGTH OF STITCH…………...………………….…...…………………...7

15. ADJUSTMENT THE HEIGHT OF THE FEED DOG…..…………………………………………………7

16. TIMING BETWEEN THE HOOK AND THE NEEDLE......….……………………………….……….…...8

17. ADJUSTMENT OF BOBBIN CASE OPENER......….……………………………….……….….................9

18. THE HEIGHT OF THE PRESSER FEET …………………………………………..………………….…..9

19. TIMING OF THE VIBRATING AND LIFTING PRESSER FEET………………………………………..10

20. THE CLEARANCE OF THE VIBRATING AND LIFTING PRESSER FEET…………………………10

21. ADJUSTMENT OF THE THREAD CONTROLLER SPRING………………………..………………….11

22. REPLACEMENT OF THE CONNECTION BELT………………………………………………………...11

23. TO RE-ENGAGE THE SAFETY CLUTCH…………………………………………………………….....12

24. ADJUSTMENT OF THE OILING FOR THE HOOK SADDLE………………………………………….13

PARTS CATALOG

A. ARM BED AND IT’S ACCESSORIES…………………………………………………………….………14

B. ARM SHAFT MECHANISM……………………….……………………………………………...………17

C. PRESSER FOOT MACHANISM……………………………………………..………………….….……..20

D. STITCH REGULATOR MACHANISM…………………………………………………..……………23

E. HOOK SHAFT MECHANISM..…………………………………………………………………….…..…26

F. THREAD TENSION REGULATOR MACHANISM……..…………………………………….………....29

G. PARTS FOR SINGEL NEEDLE………………………………………………………………….…..…32

H. PARTS FOR TWIN NEEDLE………………………………………………………………….………..…34

I. SPECIAL PARTS FOR 20”…………………………………………………………………………………35

J. ACCESSORIES…………………………………………………………………………………………….37

- 1 -

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 pulley.

（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 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）If 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 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 machine nameplate.

3) Precautions for operating conditions

（1）Avoid using the machine at abnormally high temperatures（35℃or higher）or low temperatures（5℃

or lower）.

（2）Avoid using the machine in dusty conditions.

2. SPECIFICATIONS

GC20698-5 GC20698-6 GC20698-7 GC20698-8

MAX. SPEED (s.p.m.) 1,200

MAX. STITCH (mm) 10

MAX. LIFT OF FOOT (mm) 20

NEEDLE DY × 3 (standard No.24) ·SY5213 · 794

BOBBIN SIZE (mm) Φ37× 13

WORKING SPACE (mm) 508 × 153 762 × 153

BED DIMENSION(mm) 846 × 230 1，100 × 230

NEDDLE SPACING ─

3/4”

(19mm)(standard)

1/4 ”(6.4 mm)～

1-3/4”(44.5mm)

─

3/4”

(19mm)(standard)

1/4 ”(6.4 mm)～

1-3/4”(44.5mm)

- 2 -

USE FOR:Tent,Sailcloth,Rubberized,Fabrics,Heavy Synthetic, Heavy Upholstery Materials,Fiber

Plate,Leather,Etc.

3. SETTING UPTHE MACHINE（Fig. 1）

Setting up the machine on the table after removed two pieces of supporting bolts（A）under the bed.

Fig.1

4. OILING（Figs. 2, 3, 4 & 5）

Oil should be applied at each of the place designated by arrows in Figs. 2, 3, 4&5.

Fig.3

Fig.2 Fig.4

- 3 -

Fig.5

To fill the oil for reservoir of hook saddle from the hole after taken out the oil gaugeA

（Fig. 6）and pour the

oil until the oil level reached to the upper reference line B of the oil gauge（Fig. 6-1）.

When in continuous use, it should be oiled at least twice a day.

Fig.6 Fig.6-1

5. NEEDLE（Figs. 7 & 8）

HIGHLEAD GC20698-5,-6,-7,-8 series machines are set up to use standard needle of DY×3

（standard No. 24）·SY5213·794. The size of needle to be used should be determined by the size of

thread, type and thickness of the sewing materials.

To insert the needle, turn the machine pulley over toward you until the needle bar moves up to its

highest point, put the needle up into the needle bar as deeply as it will go, with the long groove of

the needle faced outside.

Tighten the needle set screw securely.

Fig.7 Fig.8

- 4 -

6. THREAD（Fig. 9）

Normally, left twisted thread is used for upper（needle）thread.（But, for left side needle of

twin-needle machine, it can be finished in fine results with right twisted thread）.

LeftTwist RigthTwist

Fig.9

7. WINDING THE LOWER THREAD ON THE BOBBIN（Figs. 10 & 11）

Pass the thread through（1）-（4）, and wind several times around the bobbin, which set up to the shaft of

bobbin winder.

Press the lever（5）to arrow direction, then the bobbin winds the thread automatically, in engage with the

operation of the machine.

The bobbin will automatically be stopped after the bobbin is filled with thread.

Fig.10 Fig.11

8. REMOVINGAND INSERTING THE BOBBIN（Figs. 12 & 13）

Draw back the side plate（1）on the bed of the machine, and raise the hinged latch（2）to a vertical position,

then remove and insert the bobbin.

Insert the bobbin and pull thread（3）out about 4-5cm, then push down the hinged latch（2）and draw the

thread end under the tension spring（4）.

When closing the side plate（1）, leave just enough space for the thread to pass through.

Fig.12 Fig.13

- 5 -

9. THREADING THE NEEDLE（Figs. 14 & 15）

Pass the thread from thread guide（1）-eyelet（2）-tension disc（3）-tension thread guide（4）–guide（5）

-thread take-up spring（6）–guide（7）-take-up lever（8）–guide（7）-lower guide（9）-self threading needle

bar thread guide

（10）-through the eye of the needle（11）.(Remark) Wind the thread a single time to tension

thread guide（4）.

With the left hand hold the end of the needle thread leaving it slack from the hand to the needle. Turn the

machine pulley over toward you until the needle moves down and up again to its highest point, thus

catching the bobbin thread, draw up the needle thread, and the bobbin thread will come up with it through

the hole in the feed dog.

Lay the thread back under the presser feet and close the slide.

Fig.14 Fig.15

10.REGULATING THE THREAD TENSION（Figs. 16 & 17）

The tension on the needle thread is regulated by the thumb nutA（Fig. 16）.

The tension on the bobbin thread is regulated by the screw of the tension spring on the outside of the bobbin

case B（Fig. 17）.

To increase the tension, turn over nut A or screw to the right, and to decrease the tension, turn over nut or

screw to the left.

Fig.16 Fig.17

- 6 -

11.ADJUSTMENT OFTHE STITCH LENGTH（Fig. 18）

The length of stitch is regulated by pressing down the button（1）with left hand, while turning the machine

pulley（2）slowly with right hand in the condition of setting the top of button（1）to the feed eccentric.

To increase the length of stitch, turn the machine pulley over toward you.

To decrease the length of stitch, turn the machine pulley to opposite direction.

When the desired length of stitch is obtained, operate the machine after fully confirmed releasing the button

（1）to the original position.

Fig.18 Fig.19

12.ADJUSTMENT OF THE PRESSURE（Fig. 19）

The pressure of the presser feet is regulated by the adjusting screw.

To increase the pressure, turn the screw to clockwise, and decrease it, turn the screw to counter-clockwise.

13.REVERSE STITCHING（Fig. 20）

The chain for the feed reversing pedal is connected to the hook of feed reversing lever A underneath of the

bed of the machine.

To feed the work toward you, press down firmly on the feed reversing pedal, and do not stop to press down

on the way.

Fig.20

- 7 -

14. RELATIVE POSITION OF VIBRATING AND LIFTING PRESSER BAR,

OF THE NEEDLE AND THE NEEDLE HOLE OF THE FEEDER（Figs. 21 & 22）

The distance between the vibrating presser bar（1）and lifting presser bar(2), after adjusting the feed eccentric so

that there is no feed movement of the needle bar, should be 15.5 mm

（one needle）and 14.5 mm（two needle）.To

adjust by the screws for connecting crank (3).

Normally, relative position of the feed dog against the needle, the needle should be passed through the center of

the needle hole of the feed dog .

To adjust by the screw for the feed rock shaft bell crank(4).

Securely tighten the screws after finished adjustment.

Fig.21 Fig.22

15.ADJUSTMENT THE HEIGHT OFTHE FEED DOG（Figs. 23,24 & 25）

The maximum height of the feed dog from the surface of the needle plate is normally 1.3 mm.

To adjust this height by the screw on the feed lifting cam fork of the feed bar and raise or lower the feed dog, as

may be required, and retighten the screw（1）.

Fig.23

Fig.24

Fig.25

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