SunStar KM-570BL, KM-570BL-7, KM-572BL, KM-572BL-7 User Manual

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Page 1

SSUUNNSSTTAARR MMAACCHHIINNEERRYY CCOO..,, LLTTDD..

User’s Manual

KM-570BL

1 needle, drop feed, needle feed sewing machine

KM-570BL-7

1 needle, drop feed, needle feed sewing machine with automatic thread trimmer

KM-572BL

2 needle, drop feed, needle feed sewing machine

KM-572BL-7

2 needle, drop feed, needle feed sewing machine with automatic thread trimmer

1) For proper use of the machine, thoroughly read this manual before use.

2) Keep this manual in a safe place for future reference in case the machine breaks down.

MMMMEE--006600771100

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Best Quality

Best Price

Best Service

SSUUNNSSTTAARR MMAACCHHIINNEERRYY CCOO..,, LLTTDD..

Thank you for purchasing our product. Based on the rich expertise and experience accumulated in industrial sewing machine production, SUNSTAR will manufacture industrial sewing machines, which deliver more diverse functions, high performance, powerful operation, enhanced durability, and more sophisticated design to meet a number of user’s needs.

2. Please read this user’s manual thoroughly before using the machine. Make sure to properly use the machine to enjoy its full performance.

3. The specifications of the machine are subject to change, aimed to enhance product performance, without prior notice.

This product is designed, manufactured, and sold as an industrial sewing machine. It should not be used for other than industrial purpose.

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Safety Rules for Machine

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

1. Specification

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

1) Sewing machine

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

2) Motor

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

3) Peripheral automation devices (optional)

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

2. Installation

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

1) Installation of machine head

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

2) Installation of power switch box

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

3) Oil supply

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

4) Belt tension adjustment

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

5) Installation of program unit (Trimmer Type)

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

6) Installation of belt cover

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

7) Installation of thread stand

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

8) Installation of knee lifting pad

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

9) Installation of air pressure related parts and checking their functions (optional)

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

3. Adjustment of the Machine

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

1) Inserting the needle

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

2) Removing bobbin

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

3) Winding the lower thread

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

4) Routing the upper thread

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

5) Adjusting the thread tension

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

6) Adjusting the tension of the presser foot

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

7) Stitch length adjustment

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

8) Adjusting timing of needle and hook

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

9) Clearance adjustment between hook and opener

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

10) Adjusting feed dog height

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

11) Adjusting the auxiliary presser foot and the upper feed presser foot

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

12) Adjusting timing of the auxiliary presser foot, the upper feed foot and the needle

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

13) Adjusting stroke of upper feed presser foot

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

14) Adjusting safety device

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

15) Adjusting the trimming device

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

16) Adjustment of Thread Release

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

17) Installation of Automatic Lap Lifting Device (optional)

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

4. Causes of Troubles and Troubleshooting

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

1) Sewing machine troubleshooting

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

5. Table drawing

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

Table of contents

Page 4

Safety Rules for Machine

Safety labels in the manual are categorized into danger, warning and caution. Failure to follow the safety rules may result in physical injuries or mechanical damages. The safety labels and symbols are defined as follows.

[The meaning of the safety labels]

Danger Instructions here shall be observed strictly. Otherwise, the user will be killed or suffer severe physical injuries

Warning Instructions here must be observed, or the user could suffer fatal or severe physical injuries.

Caution Instructions here should be observed, or the user could face physical injuries or mechanical damages.

Danger

[The meaning of symbols]

This symbol means a must-not.

This symbol means a must for safety.

This symbol means that an electric shock may be caused if the instruction is not followed properly.

Warning

Caution

Page 5

1-1) Machine

mobilization

Danger

1-2) Machine Installation

Caution

1-3) Troubleshooting

Danger

In need of troubleshooting, it should be done by the trained A/S engineer of our company.

ⓐ Ahead of cleaning and repair, be sure to shut off the power supply. And wait for about 4

minutes till the machine discharges completely.

ⓑ Even a part or all of the machine should not be modified without any consultation with

our company.

company.

ⓓ After repair, please put again the safety cover disjointed while repairing.

Only personnel with a full understanding of the safety rules should move the machines.

The following directions must be observed when delivering the machines.

ⓐ At least two persons should work together. ⓑ In case the machine should be transported, please wipe the oil covered on the machine

to prevent accidents

Because physical damage such as the functional obstacles and breakdowns are likely to

occur according to the environment in which the machine is being installed. Therefore,

the following preconditions should be fulfilled.

ⓐ Please keep the order from top to bottom when unpacking the package. Especially,

mind that the nail on the boxes.

ⓑ Because machines are apt to be contaminated and corroded by dust and moisture, you

should install the climate controller and should clean the machines regularly.

secure enough space to repair.

ⓔ Don’t run the machine near the places with the dangers of explosion. Don’t run the

machine near the places with the dangers of explosion, including the places where the

spraying product like aerosol are used in large quantities or oxygen are dealt with,

unless the exact actions concerning the operation are guaranteed to avoid the

explosion.

ⓕ Because of the peculiarity of the machine, any illuminators are not equipped. So,

users should install the lighting apparatus around the working area.

[Note] The details about the installment of the machine are described in

No. 2 Installations.

Page 6

KM-570/572 series are manufactured for industry use to sew textiles and other similar

material. In case of running the machine, users should observe the following things.

ⓐ Ahead of operating the machine, please read the manual and understand fully the details

on its operation.

ⓑ Don’t forget to put on the garment suited for the safe work. ⓒ Keep your hands or a part of the body away from the running part of the machine like a

needle, hook, thread take-up spring and pulley etc.

ⓓ Don’t remove any kind of cover for safety while running the machine. ⓔ Be sure to connect the earthed line. ⓕ Before opening the electric box such as a control box, be sure to shut off the power

supply and make sure that the power switch should be put on “off.” ⓖ When threading the needle or before checking after sewing, be sure to stop the machine. ⓗ Don’t switch on the power supply with the foot on the pedal. ⓘ Don’t run the machine when the cooling fan are not running. Be sure to clean the air

filter in the control box once a week. ⓙ If possible, keep off from the strong electronic wave like a high frequency welding

machine.

1-4) Machine Operation

Warning

ⓐ Safety Label: Suggestions while running the machine are stated. ⓑ Thread take-up spring cover: the device to prevent the human body from touching the

thread take-up spring. ⓒ Belt cover: the device to prevent hands, feet and clothing from getting jammed by the

belt. ⓓ Finger guard: the device to prevent fingers from contacting the needle.

1-5) Safety Device

Warning

Always start the machine with safety covers in place since fingers

or hands could be injured or cut off by the belt. Turn off the power

switch during check-ups or adjustments.

ⓓ

ⓐ

ⓒ

ⓑ

Page 7

“Caution”is attached to the machine for safety.

In case of starting to run the machine, read the directions of “Cautions”carefully.

1-6) Position of Caution

Mark

1-7) Content of

““

Caution

””

CAUTION

경고

Do not operate without finger guard and safety devices. Before threading, changing bobbin and needle, cleaning etc. switch off main switch.

손가락 보호대와 안전장치 없이 작동하지 마십시오. 실, 보빈, 바늘교환시나 청소전에는 반드시 주 전원의 스위치를 꺼 주십시오.

CAUTION

경고

Hazardous voltage will cause injury. Be sure to wait at least 360 seconds before opening this cover after turn off main switch and unplug a power cord.

고압 전류에 의해 감전될 수 있으므로 커버를 열 때는 전원을 내리고 전원 플러그를 뽑고 나 서 360초간 기다린 후 여십시오.

CAUTION

경고

Do not operate without finger guard and safety devices. Before threading, changing bobbin and needle, cleaning etc. switch off main switch.

손가락 보호대와 안전장치 없이 작동하지 마십시오.

실, 보빈, 바늘교환시나 청소전에는 반드시 주전원의 스위치를 꺼주십시오.

CAUTION

경고

Hazardous voltage will cause injury. Be sure to wait at least 360 seconds before opening this cover after turn off main switch and unplug a power cord.

고압 전류에 의해 감전될 수 있으므로 커버를 열 때는 전원을 내리고 전원 플러그를 뽑고 나서 360초간 기다린 후 여십시오.

[Position of Caution Mark]

Caution

Page 8

UsageModelOptional device

1) Sewing machine

Specification

2) Motor

① Servo motor controller

KM-570BL-7 KM-570BL

KM-572BLKM-572BL-7

Purpose

Lubrication Method

Max. Sewing Speed

Max. No. of Stitches

Needle Stroke

Manual

Lap

Automatic

Hook

Needle

Automatic Backtacking Device

Automatic Trimmer

Bed Size

For Heavy Materials (sheet, bags, tents, sofas, etc.)

Automatic Lubrication

2,000spm

9mm

36mm

10.5mm

16mm

2~6mm

Horizontal 2.5x Hook

DP×17 #23 (#14~#25)

568×178mm

② Clutch motor

3) Peripheral automation devices (optional)

AUTO KNEE LIFTING

SYSTEM

PRODUCTION

COUNTER

MATERIAL EDGE

SENSOR

STANDING PEDAL

SCOUN-1

SEDG-1C SEDG-2C

SPDL-1 SPDL-2

A counting device which indicates the completed quantity on the program unit panel, including added, subtracted, corrected or remaining quantity along with other performance rates.

A device that senses the edge or thickness of the sewing material to stop the machine without manual pedaling. Available in two types: SEDG-1C for edge sensing type and SEDG-2C for thickness sensing type.

An essential device when one person is operating multiple sewing machines. Has different pedals for acceleration, thread trimming, presser foot and ascending pedal. Types consist of SPDL-1 for fixed speed and SPDL-2 for variable speed.

When the pedal is placed at reverse step 1, the presser foot is automatically lifted. It is because the machine has employed the pneumatic cylinder structure.

Presser Foot

Lift

Crossing Between Upper Feed Presser

Foot and Supplementary Presser Foot

Power Supply

Category

16mm (optional) 16mm (optional)

－－

Basic Supply

1-phase 110/220V,

3-phase 220V

1-phase 110/220V,

3-phase 220V/380V

1-phase 110/220V,

3-phase 220V

1-phase 110/220V,

3-phase 220V

Basic Supply

－－

MODEL

SC55-1B

SC55-3B

VOLT

1 Phase 110V

1 Phase 220V

3 Phase 220V

WATT

550W

HERTZ

50/60 Hz

MODEL

HEC-1706(1 Phase)

HEC-1705(3 Phase)

VOLT

110/220V

220/380V

WATT

400W

HERTZ

50/60 Hz

Page 9

Installation

1) Installation of machine head

※ Insert hinge rubber① into the table. As described in “Figure 1”, put the oil pan corner in the middle of the head

supporting rubber② and attach the table. After putting the hinge ③ in the bed hole, insert the hinge rubber① and install

the sewing machine in the table corner rubber cushion.

[Figure 1]

2) Installation of power switch box

When attaching the power switch box①, as shown in “Figure 2”,

attach it to lower right corner of the table.

①

[Figure 2]

Warning

▶ In case of installing the machine, it should be performed by the trained engineer.

▶ In case of wiring work, be sure to leave the work to an expert or an agent.

▶ The machine weight over 42kg. At least 2 persons should carry out the installing work.

▶ Plug in after finishing the installing work. In case the user press on the step by mistake, the

machine runs automatically. By doing so, it can cause the physical injuries.

▶ Connect the earthed lines.

Imperfection of the connection of the earthed lines gives rise to an electric shock or malfunction.

▶ Set the belt cover on top of the machine.

▶ In case of bending the machine backward or returning to the original condition, be sure to use

both hands. If you use only one hand, it causes physical injuries by slipping.

①

②

③

④

Page 10

[Figure 3]

3) Oil supply

(1) Fitting the magnet to remove chips (iron powder).

Find the magnet for chip removal① in the accessory box and attach it to the oil pan as in “Figure 3.” ※ Do not use the magnet for other purposes. Operating the sewing machine without the magnets may cause malfunction

and adverse effects to its durability.

(2) Filling the oil pan with lubricants

A. Fill the lubricant up to the “H” point. B. You should use the exclusive oil provided by “SUNSTAR” for industrial sewing machines or TELLUS C10” of the

Shell company.

C. If the oil lever drops to the “L” level, replenish it to the “H” point.

D. Change the lubricant once every two weeks.

4) Belt tension adjustment

After installing the motor, if you sufficiently loosen the fixed nuts ① and ②, tension in the belt④ will occur naturally because of the weight of the motor③. At this moment, tighten the fixed nut① and use fixed nut ② to fix

it firmly. (See figure 4)

[Figure 4]

④

③

①

②

Caution

▶ Be sure to plug in after finishing oil supply.

If the user press on the step by mistake, the machine runs automatically. By doing so, it can cause the physical injuries.

▶ In case of treating the lubricant, don't bring the lubricant into contact with eyes or the skin. Its

contact can cause an inflammation. And don't drink the lubricant. It can cause vomiting or diarrhea. And Keep it out of the reach of the children.

▶ Be sure to run the machine after supplying oil in case you should start to run it for the first time,

or in case it has not been used for a long time.

①

Page 11

7) Installation of thread stand

As shown in “Figure 7”, assemble the thread stand①, insert it in the table hole, and use the fixed nut② and washer③ to fix it.

[Figure 7]

6) Installation of belt cover

A. Set the groove at the bottom of belt cover “A”① to be

aligned with the groove of the head of the belt cover supporting screw②, and insert the cover into the groove. Use the belt cover fixing screws ③ (2EA) to fix the

cover to the body of the machine.

B. Insert the belt cover “B”② into the belt cover “A”①

while maintaining the balance. Use the belt cover fixing

screws (3EA) to fix the belt covers to the body of the

machine.

[Figure 6]

5) Installation of program unit (Trimmer Type)

A. Use 4 fixed screws③ to fix the bracket ② on the

program unit①

B. In the program unit①, use two fixed bolts ④ to tightly

fix the assembled brackets②.

[Figure 5]

③

①

②

④

①

②

③

④

①

② ③

Page 12

8) Installation of knee lifting pad

A. Find the lap lifting pad (ass'y) ① in the accessory box

and insert it into the shaft of the oil pan's control body ②.

B. Loosen bolt ③ and maintain knee-lifting pad in vertical

position to tighten it.

[Figure 8]

9) Installation of air pressure related parts and checking their functions (optional)

(1) Installation

As shown in the figure, after fixing the air pressure filter

on the bracket, use the neck screw to fix the bracket on

the lower side of the table.

(2) Air pressure adjustment

a) Adjust the pressure by taking out and lifting the air

pressure filter① knob ② .

b) After adjusting the air pressure to. 0.49㎫(5㎏f/㎠)

turn the knob ② to its original position and the

adjustment is over.

[Figure 9]

①

②

Caution

▶In need of regulating the machine with the switch on or with the air injected, please pay special

attention to your safety.

▶Please adjust air pressure to 0.5Mpa.

①

②

③

Page 13

1) Inserting the needle

As in Figure 10, while the needle groove① is headed inward, place the upper end of the needle to closely contact the upper stopper hole②, and then fix the needle by using the fixing screw③.

2) Removing bobbin

Place the needle ① in the highest position. As in Figure 11, open the sliding plate② and erect the hook③ and the bobbin holder④ to separate the bobbin⑤ (see Figure

11).

Adjustment of the Machine

[Figure 11]

[Figure 10]

Caution

▶In case of setting the needle, be sure to switch off the power supply. In case the user press on the

step by mistake, the machine runs automatically. By doing so, it can cause the physical injuries.

▶In case of using the clutch motor, the motor revolves because of inertia for a while even after switching

off the power supply. Be sure to start to work only after the motor comes to a complete stop.

[ KM-570 BL ][ KM-572 BL ]

②

③

①

③

④

③

①

②

⑤

Page 14

3) Winding the lower thread

Insert the bobbin ② into the hook ①. As seen in Figure 12, insert the thread through 󳟆 part of the hook and pull it out

from the end of the lower thread tension adjustment plate ③. And then pull the thread through the clearance ⑤ between the hook ① and opener ④. The adequate length of

the pulled-out lower thread on the slide plate is 50 mm.

[Figure 12]

Lower thread

About 50 mm

④

⑤

󳟆

③

②

①

4) Routing the upper thread

Place the thread take-up lever to the highest position and

hang the upper thread as in Figure 13. ※ The adequate length of upper thread extending from the

needle hole is 50 mm for initial sewing.

[Figure 13]

Caution

▶In case of adjusting the tension of the lower thread, be sure to switch off the power supply.

If the users press on the step by mistake, the machine runs automatically. By doing so, it can cause the physical injuries.

▶In case of using the clutch motor, the motor revolves because of inertia for a while even after

switching off the power supply.

Caution

▶In case of taking up the upper thread, be sure to switch off the power supply.

If the users press on the step by mistake, the machine runs automatically. By doing so, it can cause the physical injuries.

▶In case of using the clutch motor, the motor revolves because of inertia for a while.

Be sure to start to work only after the motor comes to a complete stop.

50mm

Page 15

5) Adjusting the thread tension

(1) Adjusting the thread tension

As in Figure 14, turning clockwise the tension adjustment nut ① of the thread tension control

assembly makes the upper thread tension stronger and

counter clockwise makes it weaker.

(2) Adjusting the lower thread tension

As in Figure 15, turning the tension adjustment screw ① of the hook clockwise makes the lower thread

tension stronger and counterclockwise makes it weaker.

[Figure 14]

[Figure 15]

(3) Adjusting the tension of thread take up lever spring

A) Adjusting the thread take up stroke

As in figure 16, loosen the stopper clamp screw ③, and turn the thread take up lever’s spring stopper ① clockwise to

make the stroke smaller and counter clockwise to make it bigger. ※ The thread take up stroke is normally 10~14 mm.

[Figure 16]

Upper thread tension is weak

Upper thread tension is strong

Good sewing

①

Smaller

②

③

Bigger

Page 16

B) Adjusting the thread take up tension

As in figure 17, loosen the screw ② of the thread

tension control assembly, and insert the driver into the groove of the thread tension control assembly ③. Turn clockwise to make the spring ① tension

stronger and counter clockwise to make it weaker.

(See Figure 17)

C) Adjusting the timing of the thread take up spring

tension As in Figure 18, loosen the stopper screw ①, and turn clockwise the guide plate ③ for the thread take up spring to make the timing of the spring ② faster

and counter clockwise to make it slower. ※ The timing of the thread take up spring tension is

normal, when the guide plate is located in the

middle as can be seen in figure.

[Figure 17]

[Figure 18]

③

①

②

Strong

Weak

D) Adjusting the auxiliary thread tension control

assembly (for automatic trimming type)

As in Figure 19, when the auxiliary thread tension adjustment nut ① is turned clockwise, the length of

the thread after trimming is short. The other way

makes the thread long. ※ The appropriate length of the upper thread on the

needle after trimming is 35~45 mm.

[Figure 19]

②

①

③

①

35~45mm

Page 17

6) Adjusting the tension of the presser foot

As in Figure 20, turning the pressure adjustment screw ①

clockwise makes the presser foot tension stronger, and

turning counter clockwise makes it weaker. After adjusting, make sure to tighten the fixing nut ②.

[Figure 20]

[Figure 21]

7) Stitch length adjustment

As shown in “Figure 21”, the numbers that are shown in the stitch length adjusting dial① are the stitch length represented in “mm”. Find the stitch length you want by

adjusting it from left to right.

8) Adjusting timing of needle and hook

(1) Fixing the height of the needle bar

※ Turn the pulley to make the needle bar be placed in its lowest position. Loosen the needle bar holding screw① in

Figure 23 to make sure that the needle bar carved sign ⓐ meets the end ⓑ of the frame, then tighten the screw.

[Figure 22] [Figure 23]

Caution

▶After finishing dismantling or adjusting the safety devices, be sure to install it in the original

position properly and check whether it functions as desired or not.

▶In case of bending the machine backward or returning to the original condition, be sure to use

both hands. If you use only one hand, it can cause the physical injuries by slipping.

▶In case of adjusting the machine with the switch on, be sure to see that all is right.

▶In case of troubleshooting or checking the machine, it should be performed by the trained engineer.

▶In case of repair and checking related to electricity, be sure to leave the work to an expert or an agent.

①

②

Weaker

Stronger

①

ⓑ

ⓐ

The needle bar in the lowest position

①

Page 18

(2) Adjusting the timing of hook edge and needle center crossing

First, set the stitch length at “0”. Adjust the hook gear clamp screw ① in Figure 25 so that the hook edge fall exactly at

the center of the needle center when the needle bar is raised 2.4 mm from its lowest position as in Figure 24. When this is

done, the hook edge will be placed at about 1.5 mm above from the front of the needle thread hole.

[Figure 24]

[Figure 25]

①

9) Clearance adjustment between hook and opener

Loosen the opener clamp screw ③ and turn the opener ② to the right and left so that the distance between the hook ① and the opener ② is about 0.2mm as in Figure 28 when the opener ② is pulled to its max towards the arrowed direction.

[Figure 28]

(3) Adjusting the distance between the needle and the hook edge

Raise the needle from its lowest point so that the hook edge meets the needle center. As in Figure 26, when the lower part of the needle meets the balance point of the hook’s needle guide plate ① (adjust the needle guide form), adjust the distance between the hook edge and the inner side of the needle groove to 0.05~0.1 mm. Loosen ①, ② and ③ in Figure 27 and move the hook base ④ to the left and right for adjustment. (After adjustment, fasten ①, ② and ③ firmly.)

[Figure 26] [Figure 27]

0.05~0.1mm

Adhering part

Needle

①

Hook edge

①

②

③

①

②

③

④

①

②

0.2mm

③

Page 19

10) Adjusting feed dog height

Turn the pulley so that the feed dog ① is positioned at its hight to adjust the feed dog ①. Loosen the fork clamp screw ④ of

the feed dog base as in Figure 29 and move the feed dog base up and down so that the feed dog protrudes about 1 mm from the needle plate top. After adjustment, fasten the clamp screw ④ firmly.

11) Adjusting the auxiliary presser foot and the upper feed presser foot

※ Both the auxiliary presser foot and the upper feed presser foot move up and down. ※ It is normal that both of them move up and down to the same height. ※ Take the following steps either to adjust the stroke of both to be the same or to make one of the two adjusted lower or

higher, depending on sewing materials.

(1) Adjusting the strokes of both to be the same

A) The vertical motion range of the supplementary presser foot① and the upper feed presser foot② is 2~6mm. B) Loosen the adjusting hinge screw ③. C) Vertically adjust the hinge screw③ depending on sewing fabric. When the motion range is set large, move the

adjusting hinge screw③ upward. Otherwise, move the adjusting hinge screw downward.

[Figure 29]

①②

About 1 mm

③

④

[Figure 30]

①

②

③

6mm

Increase

Decrease

Page 20

󳡒 Adjusting the auxiliary presser foot

※ Loosen the pressure-adjusting screw ④ and the bracket-fastening screw ⑤. ※ Adjust the bracket-fastening screw ⑤ so that the auxiliary presser foot① rise about 10.5 mm from the needle plate

top when the pressure lifter ③ is raised. (After adjustment, be sure to fasten the bracket-fastening screw ⑤ first, and then adjust the pressure-adjusting screw ④.)

※ Affter the adjustment of the height of the auxiliary presser foot①, adjust the upper feed presser foot②.

󳡓 Adjusting the upper feed presser foot

※ Loosen up and down crank clamp screw ⑥ when the pressure lifter ③ is down. ※ Move the needle bar close to its highest position. ※ Adjust the height of the upper feed presser foot② to the sewing materials.

(2) Adjusting the height of the strokes of both different

[Figure 31]

②

①

⑥

④

⑤

③

10.5mm

Page 21

12) Adjusting timing of the auxiliary presser foot, the upper feed foot and the needle

When the needle ① goes down, the upper feed presser foot ③ should adhere to the feed dog ② before the needle edge adheres to the upper part of the feed dog ②. The upper feed presser foot ③ should continue to adhere to the feed dog ② even when the needle ① edge, going up, and the upper part of the feed dog ② are detached with each other. If not, loosen the two up-and-down cam ⑤ clamp screws ④ to adjust right and left the fixed position of the up-and-down cam ⑤ of the presser

foot. (See Figure 32)

[Figure 32]

13) Adjusting stroke of upper feed presser foot

(1) As in Figure 33, the machine is adjusted to have the same amount of upper feed presser foot stroke ④ as the feed dog

stroke ⑤. (The baseline ⑥ of the shake crank ③ is aligned with the baseline ⑦ of the collar.)

(2) Take the followings steps, if the two base lines are not aligned or if it is necessary to adjust the stroke ④ of the upper feed

presser foot to increase or decrease.

󳡒 Loosen nut ①. 󳡓 Move nut ① to the back ② of the horizontal roller to increase the stroke ④ of the upper feed presser foot. Move nut

① to the front ③ of the shake crank to decrease it.

󳡔 After adjustment, be sure to fasten nut ①.

[Figure 33]

①

③

②

④

When the needle goes down When the needle goes up

⑤

⑦

③

②

①

④

⑤

Lower feed

Upper feed

⑥

Page 22

14) Adjusting safety device

If the load occurs by foreign substances on thread, needle, etc, during the sewing operation, the driving ball ① of safety assembly in Figure 34 is removed to prevent damage of the hook and other major parts from the lood, and the pulley ② and the clutch plate ③ on the safety assembly are removed. Then, the driving force of timming belt on the upper shaft does not delivered to the lower shaft, so only the pulley ② of safety assembly rotates idly. In case that the safety assembly starts operating during the work, turn power switch off and remove causing factors of load. Later, with safety button ④ pressed, turn the pulley to place the driving ball① of safety assembly to its original position. ※ Adjust the intensity of the safety assembly spring ⑤ by rotating safety assembly adjustment screws ⑥ from side to side

in accordance with working conditions. (Turning the screw to left makes the intensity stronger, and right to make it

weaker. Make sure to give same pressure on the three screws.)

[Figure 34]

15) Adjusting the trimming device

(1) Adjustment of Initial Position of Moving Blade

Loosen the tightening screws ①,② for trimmer crank, and set the slant end of the moving blade③ to protrude 0~0.5mm from the fixed blade④. Then fasten the tightening screws①,② for trimmer crank.

[Figure 35]

①

③

⑤

⑥

②

⑥

④

①

②

③

④

0~0.5mm

Page 23

(2) Distance Adjustment Between Moving Blade and Hook Stopper

A) Turn the pulley by hand to place the needle bar at the lowest position. B) Press the trimmer driving link① with the needle at the lowest position. Turn the pulley until the moving blade②

reaches to the end.

C) Loosen the screws ③, ④ to set the distance between the moving blade and the hook stopper at 0.5mm.

[Figure 36]

(3) Adjustment of Trimmer Cam

A) Set the distance between the oil pump① and the trimmer cam bushing② at 34mm, and then fasten the tightening

screw③.

B) Place the trimmer cam④ to closely contact the end of the bushing. Place the thread release cam⑤ to closely contact

the end of the trimmer cam, and then fasten the screw.

[Figure 37]

①

③ ② ④

0.5mm

①

34mm

②⑤

④

③

Page 24

C) Turn the pulley by hand to place the needle bar at the lowest position. D) Press the trimmer driving link⑥ to insert the trimmer cam roller⑦ into the groove of the trimmer cam④.

E) Turn the pulley by hand to make the needle ascend 5mm from the lowest position. Then loosen the trimmer cam

screw⑧ to enable the adjustment of the moving blade. When adjustment completes, fasten the screw.

(5) Maintenance of Fixed Blade

If the thread cutting fails often or if the cut section of the

thread is not smooth, check the fixed blade status.

If the blade is blunt, use a find sandpaper or greased

whetstone to sharpen the blade (see Figure 40).

[Figure 40]

(4) Adjustment of Moving and Fixed Blade Pressure

A) Loosen the fixing screw② for the fixed blade base

①.

B) Turn the eccentric screw③ to adjust the blade

pressure and then fasten the tightening screw for the fixed blade base②.

C) Test the moving blade to check whether it is sharp

enough to cut the thread.

[Figure 39]

⑥

⑦

④

[Figure 38]

고정메스

기름숫돌

Page 25

16) Adjustment of Thread Release

(1) Turn the pulley by hand to place the needle bar at the lowest position. (2) Press the trimmer driving link① to insert the trimmer cam roller② into the groove of the trimmer cam③. (3) Turn the pulley by hand to place the thread take-up lever at the highest position. Loosen the tightening screw④ and adjust

the thread release collar⑤ to make the thread tension dish closed when the thread take-up lever is located at the highest

position. When adjustment completes, fasten the screw.

(4) The tension thread opening is adjusted by the thread release roller⑥, which is installed at the protruded part of the thread

release collar⑤. Loosen the screw⑦. Fasten the screw after tightening the thread release cable⑧.

(5) Loosen the nut⑨ to make the fine adjustment. When the cable cap⑩ is moved to the right side, the opening will become

bigger.

[Figure 41]

17) Installation of Automatic Lap Lifting Device (optional)

(1) First of all, remove the manual lap lifting device before installing the automatic lap lifting device (see figure).

Loosen the screw to remove the installed parts. Then install the automatic lap lifting device as in Figure 42.

Connect the two pneumatic tubes in order as in the figure, and tie the tubes with other lead lines with band clips.

[Figure 42]

①

②

④

⑩

⑨

⑧

⑦

⑥

⑤

③

Page 26

(2) Connect the pneumatic unit and the cylinder as in Figure

42 and 43 by using the pneumatic hoses 󳟆, 󳟇.

[Figure 43]

󳟇

󳟆

Page 27

Causes of Troubles and Troubleshooting

1) Sewing machine troubleshooting

No Symptom Checkpoints Root cause Corrective action

Needle breaks

Thread breaks

Poor thread

adjustment

Upper thread

falls out when

starting to sew

or sewing is

skipped

Reinsert the needle correctly and push in to its highest level.

Change the needle.

Adjust the timing of feed dog.

Adjust the timing of needle and hook.

Adjust the location of the hook.

Thread the needle correctly.

Change the needle.

Insert the needle correctly.

Reduce the tension of upper thread.

Reduce the tension of lower thread.

Adjust the stroke level.

Remove the scratch on the hook edge.

Remove the scratch on the feed dog.

Remove the scratch on the needle plate.

Adjust the upper and lower thread tension.

Adjust the thread take up spring tension.

Adjust the gap between the opener and hook.

Reinsert the needle correctly and push in to its highest level.

Change the needle.

Insert the thread in the right way.

Adjust the timing between the needle and hook.

Adjust the position of the hook.

Increase the adjustment volume of the upper thread on the control box.

Adjust the location and tension of the lower thread holder.

Readjust the needle’s up-stop film position.

Adjust the felt tension.

Needle is inserted into wrong position.

Needle is bent

Bad timing of feed dog

Bad timing of needle and hook

The heads of the needle and the hook interfere each other.

Wrong threading

Bent needle

The direction and height of the needle inserted is wrong.

Too tight upper thread tension

Too tight lower thread tension

Too much working capacity

There is a scratch on the hook edge

There is a scratch on the needle hole of the feed dog

There is a scratch on the thread case and around the needle plate.

Upper and lower thread tensions are bad.

Thread take up spring tension is inadequate.

The gap between the opener and hook is inadequate.

Needle is inserted into wrong direction.

Needle is bent

Wrong direction

The timing between the needle and hook is bad.

Needle and hook head are too far apart.

The length of the remaining upper thread is too short.

After trimming, lower thread holder does not hold the lower thread.

Due to problems in the up-stop position of the needle, the thread take up lever pulls the upper thread out of the needle when the sewing starts.

The upper thread oil felt is pressing the thread too strongly.

Direction and height of needle

Needle

Timing of the feed dog

Gap between needle and hook

Threading method

Needle

Direction and height of needle

Upper thread tension

Lower thread tension

Working capacity of takeup lever spring

Hook

Feed dog

Needle plate

Thread tension

Thread take up spring tension

Gap between opener and hook

Direction and height of needle

Needle

Threading

Hook timing

Gap between the needle and the hook

Remaining upper thread length after trimming

Lower thread holder

Check the up-stop position of the needle

Check the oil felt tension of upper thread

Page 28

No Symptom Checkpoints Root cause Corrective action

5 Trimming miss

Too short thread

length after

trimming

Readjust the movable knife setting position.

Correct the tension adjustment and surface contact of movable and fixed knives.

Insert the needle correctly.

Replace movable knife or fixed knife.

Adjust trimming cam timing.

Adjust the thread release stroke.

Adjust the trimming timing.

Adjust the thread release stroke.

Adjust the tension of the auxiliary thread tension control assembly.

Adjust the working capacity.

Increase the volume adjustment.

The height and distance between the movable knife and the hook do not match.

Tension and contact of movable and fixed knives are bad.

Needle is not inserted correctly.

Scratch and abrasion of movable and fixed knives.

Trimming cam timing is bad.

Stroke of thread release is too small.

Wrong trimming timing

The opening on the thread tension control plate is too small.

Too strong tension on the auxiliary thread tension control assembly.

Too much working capacity

Volume is adjusted to too low.

The gap between the movable knife and the hook

Check the tension of fixed knife

Direction of the needle

Blade side of movable and fixed knives

Trimming cam timing

Stroke of thread release

Trimming timing

Opening of the thread tension adjusting plate

Tension of auxiliary thread tension adjustment assembly

Working capacity of takeup lever spring

Thread release adjustment volume on the control box

Page 29

Table Drawing