SunStar KM-2070P, KM-2070P-7 User Manual

USER S MANUAL

KM-2070P SERIES

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Electronically Controlled
1-Needle ZigZag Lock Stitch
Machine
(Mechanical Part)

Best Quality

Best Price

Best Service

SunStar CO., LTD.

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1.

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.

4.

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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CONTENT

1. Machine Sefety Regulations 5

2. Machine Specifications 8

3. Machine Configuration 9

1) Part Name of Machine 9

2) Internal Structure of Control Box 10

4. Machine Installation 11

1) Environment for Machine Installation 11

2) Electric Installation Environment 11

3) Safe Table Mounting of Machine 11

4) Installation of Presser Foot Lifter Pad 13

5) Adjustment of Presser Foot Lifter (group) Pad 13

6) Belt Cover Installation 14

7) Thread Stand Installation 14

8) Power Voltage and Power Code Connection 15

9) Cable Connection to Control Box 16

10) Exchanging the fuse 17

11) Head Earth Connection 17

5. Preparations to Use the Machine 18

1) How to fill Lubricating Oil 18

2) How to Set a Needle 18

3) How to Remove Bobbin Case 18

4) Bobbin Case Attachment Method 19

5) How to Wind Lower Thread 19

6) Upper Thread Passing Method 20

7) Adjusting of Stitch Number 20

6. Sewing 21

1) Sewing Method 21

7. Machine Repairing Method 22

1) Thread Tension Adjustment 22

2) Presser Foot Pressure Adjustment 23

3) Presser Foot Height Adjustment 23

4) Feed Dog Height Adjustment 24

5) Feed Dog Slope Regulation 24

6) Feed Dog Front and Back Adjustment 25

7) Needle and Transfer Timing 25

8) Needle Bar Height Adjustment 26

9) Needle and Hook Timing 27

10) Location Adjustment of Hook Holder 27

11) Synchronizer Adjustment 28

12) Lubrication Adjustment for Hook 29

13) Adjustment of Upper Thread Remainder after Thread Cutting 29

14) Location Adjustment of Thread Cutting Cam 31

15) Tension Adjustment of Lower Thread Presser 32

16) Exchange of Fixed Mess and Moving Mess 32

17) Gauge Parts 33

18) Adjustment of the Device for Rasing Presser Foot Minutely 33

19) Method of Setting the Starting Point 34

8. Maintenance 35

9. In Case of Using Feed Dog Except Sunstar’s One 36

10. Failure Causes and Countermeasures 37

11. Table Drawing 39

12. Guage Parts 40

1

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Safety instruction on this manual are defined as Danger, Warning and Notice.
If you do not keep the instructoins, physical injury on the human body and machine damage might be occurred.

: This indication should be observed definitely. If not, danger could be happen during the installation,

conveyance and maintenance of machines.
: When you keep this indication, injury from the machine can be prevented.
: When you keep this indication, error on the machine can be prevented.

Danger

Warning

Notice

1-1) Machine Transportation

Danger

1-2) Machine Installation

Notice

1-3) Machine Repair

Danger

Those in charge of transporting the machine should know the safety regulations very
well. The following indications should be followed when the machine is being
transported.

ⓐ More than 2 people must transport the machine.
ⓑ To prevent accidents from occurring during transportation, wipe off the oil on the

machine well.

The machine may not work well or breakdown if installed in certain places, Install the
machine where the following qualifications agree.

ⓐ Remove the package and wrappings starting from the top. Take special notice on the

nails on the wooden boxes.

ⓑ Dust and moisture stains and rusts the machine. Install an airconditioner and clean

the machine regularly.

ⓒ Keep the machine out of the sun.
ⓓ Leave sufficient space of more than 50cm behind, and on the right and left side of

the machine for repairing.

ⓔ EXPLOSION HAZARDS

Do not operate in explosive atmospheres. To avoid explosion, do not operate this
machine in an explosive atomsphere including a place where large quantities of
aerosol spray product are being used or where oxygen is being administered unless
it has been specifically certified for such operation.

ⓕ The machine were not provided with a local lighting due to the feature of machine.

Therefore the illumination of the working area must be fulfilled by end user.

[Refer] Details for machine installation are described in 4. Machine Installation.

When the machine needs to be repaired, only the assigned troubleshooting engineer
educated at the company should take charge.

ⓐ Before cleaning or repairing the machine, turn off the main power and wait 4

minutes till the machine is completely out of power.

ⓑ Not any of the machine specifications or parts should be changed without consulting

the company.
Such changes may make the operation dangerous.

ⓒ Spare parts producted by the company should only be used for replacements.
ⓓ Put all the safety covers back on after the machine has been repaired.

5

KM-2070P Series is made to sew patterns on fabrics and other similar material for
manufacturing.
Follow the following indications when operating the machine.

ⓐ Read through this manual carefully and completely before operating the machine.
ⓑ Wear the proper clothes for work.
ⓒ Keep hands or other parts of the body away from the machine operation parts(needle, shuttle,

thread take-up lever, and pulley etc.) when the machine is being operated.

ⓓ Keep the covers and safety plates on the machine during operation.
ⓔ Be sure to connect the earthing conductor .
ⓕ Turn off the electric main power and check if the switch is turned “off”before opening

electric boxes such as the control box.

ⓖ Stop the machine before threading the needle or checking after work.
ⓗ Do not step on the pedal when turning the power on.
ⓘ Do not operate the machine with any cooling fan blocked.

The air-filter on control box must be cleaned once a week.

ⓙ If possible, install the machine away from source of strong electrical noise such as high

frequency welding machines

1-4) Machine Operation

Warning

[ Warning ]
Belt will crush or amputate finger or hand, keep cover in place before operating, turn off
power before inspecting or adjusting.

6

1-5) Devices for Safety

Warning

ⓐ Safety label : It describes cautions during operationg the machine.
ⓑ Face plate guard : It prevents from any contact between body and take-up lever .
ⓒ Belt cover : It prevents from insertion of hands. feet or clothes by beit.
ⓓ Label for specification of power : It describes caution for safety to protect against electric shock

during rotating the motors.

ⓔ Finger guard : It prevent from contacts between a finger and needle.

ⓒ

ⓑ

ⓔ

ⓓ

ⓐ

Caution mark is attached on the machine for safety.
When you operate the machine, observe the directions on the mark.
Position of Warning Mark
[ View from the right-front ]

1-6) Caution Mark Position

Caution

1)

2)

1-7) Contents of Marks

Warning

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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 마
십시오.
실, 보빈, 바늘교환시나 청소전에는 반드시
주전원의 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 커버
를 열 때는 전원을 내리고 전원 플러그를 뽑
고 나서 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 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.

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MODEL KM-2070P KM-2070P-7

Stitch Type
ZigZag Width
Stitch Length
Sewing Speed

Needle
Hook
Thread Take-up

By Hand
By Knee

Automatic

Height of
Presser
Foot

Presser Foot Pressure
Needle Bar Stroke

Provided Patterns

Basic : 8 Kinds, 16 Patterns

User Input Pattern : Max. 99 Patterns, 256 Stitches per pattern

Pattern Input Function
Automatic Thread Trimmer

Height of Feed Dog
Motor Specification
Power Supply
Power Consumption
Temperature
Humidity
Airborne noise level

Upper Thread Feeding Device
Backtack/Condense Device

★

★

★

★

×

×

★

×

Wiper

1.0mm

550W A/C Servo Motor

Lock Stitch

Max. 8mm/10mm (2 Step, 3 Step)

Max. 2.5mm

Max. 5,000 spm(4,000 spm at the time of shipment)

SY 1965 Nm 70/10 or DP×5 #10

DP Hook (Titanium Coated Inner Hook) : Hook Center is Of fset

Rotary Thread Take-up

6mm

10mm

7mm(Option)

2~6kgf

33.3 mm

1 Phase: 100~240V, 3 Phases: 200~415, 50/60Hz

600VA
5。C~40。C
20%~80%

LAP󳤑79.9dB(A) (at 3500spm)(Noise measurement according to ISO 10821-CA-M1)

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3

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Face Plate Guard

※ Automatic Presser Foot Lifter (Option)

1) Part Name of Machine

Motor

Arm

Thread Stand

Operation Panel

Belt Cover

Power Switch

Control Box

Feed Control Panel

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2) Internal Structure of Control Box

Fan

Digital
Board

Transformer

Power Board

Servo Motor

Drive Board

Step Motor

Drive Board

11

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4

④

④

③

②

①

1) Environment for Machine Installation

A. In order to use safety , use in the environment as follows:

󳦠 Ambient Temperature for machine operation: 5°~40°C(32°~104°F)
󳦠 Ambient Temperature for machine reservation: -10°~60°C(14°~140°F)

B. Humidity: within 45~80% (Relative Humidity)
C. Altitude: Up to 1000m above mean sea level.

2) Electric Installation Environment

A. Power Voltage

·Use the power voltage within 10% of the rated voltage.

·It is desirable to use frequency of power within 1% of the rated frequency (50/60Hz)

B. Electromagnetic wave Noise

·It is desirable to use the power separated from the strong magnetic field and high frequency product and keep
away from them.

C. In case of attaching additional device and accessories to control box, must safe low voltage.
D. Pay attention that water; coffee and other should not enter into control box and motor.
E. Do not drop control box and motor.

3) Safe T able Mounting of Machine

A. Please fix control box ①, power switch ②, motor ③,

and hinge rubber ④ to the table.

[ Fig. 1]

[ Note ]

· Install the machine by trained technician.

· Ask electric wiring to the electric engineer of the purchased selling agent.

· Weight of the sewing machine is over 40kg. Please install it by more than two personnel.

· Do not connect power plug until installation is completed.
Accidentally stepping on the pedal, the sewing machine gets operating and causes injury.

· Execute earth connection. In case that earth connection is no stable, it becomes the cause of electric shock or
wrong operation.

· Put the belt cover on the head and motor of the sewing machine.

B. Insert head support rubber A①, and head support rubber

B② to the corner of oil fan and then mount on the table.
At this time, insert rising stitch support cap ③ on the hole
of oil fan.

C. After attaching hinge① inserted to sewing bed to hinge

rubber②, put down the head of sewing machine on head
support rubber A③ and head support rubber B ④on top
of the oil fan.

[ Fig. 2 ]

[ Fig. 3 ]

②

③

④

①

D. Drive Head Support Pole⑤ into table.

[ Note ]

· Drive head support pole ⑤ through into end of table firmly.

· Unless drive it into the end, when lay the head of sewing
machine, stability is not good and dangerous.

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[ Fig. 4 ]

E. On condition that stood the machine as shown in the

figure, insert V belt between pulley and motor of the
machine.

②

⑤

①

④

③

13

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[ Fig. 5 ]

F. After connecting V belt, fully unfasten the fixing nut ①, ②

to up and down, tension occurs to belt by self weight of
motor ③. On this condition, fasten the fixing nut① first
and the fixing nut ② tightly.

[ Fig. 6 ]

A. Insert the presser foot lifter pad (group) ① packed in the

accessory box into control body shaft ② of oil fan.

B. After unfastening the volt ③ and deciding the location

convenient of operation for presser foot lifter, tightly
fasten again.

4) Installation of Presser Foot Lifter Pad

③②

①

[ Fig. 7 ]

A. Put down the feed dog lower than top of the needle plate

by turning the pulley .
B. Put down the presser foot②to presser bar lifter①.
C. Unfasten nut③.
D. Adjust by turning the joint screw ⑥that operation olume

(space) of control body ⑤ should become about 2mm

when lightly press the presser foot lifter pad (group)④ by

hands.
E. After adjustment, joint the nut③tightly .
F. Unfasten the nut⑦.
G. Adjust by rotating joint screw⑧ that joint screw⑧

becomes about 7mm higher than control body⑤.
H. Adjust by turning joint screw⑧ that presser foot②

becomes within 10mm than needle plate when hardly

pressed the presser foot lifter pad (group) ④.
I. After adjustment, joint the nut⑦tightly .

①

②

④

③

⑥

⑤

⑧

⑦

5) Adjustment of Presser Foot Lifter (group) Pad

①

②

④

③

[ Fig. 8 ]

A. After inserting belt cover A① into sewing machine pulley

and attach with joint screw③ (three screws).

6) Belt Cover Installation

[ Fig. 9 ]

B. Fasten the tapping screw⑤ (two) keeping belt cover

C④ not to contact to belt cover A①.

7) Thread Stand Installation

Install the thread stand on the table.

[ Fig. 10 ]

14

②

①

④

⑤

15

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8) Power Voltage and Pow er Code Connection

A. Voltage Specification

· Match the indication of voltage to specification of power code and connect the cable.

1. Must not use on condition that voltage specification is different.

2. In case of change the using voltage, refer to article [Power Voltage Changing Method].

· Single-phase connection (100V, 110V, 120V, 200V, 220V, 240V)

· Three-phase connection (200V, 220V, 240V, 380V, 440V)

B. Power Voltage Changing Method

· In voltage of 110V series, 220V series and 380~440V specification, you can change into the voltages as follows
by just changing the location of power voltage switching connector.

■ Voltage change of 100~220V specification
Trans former Model: KM-2070P-110

■ Voltage change of 220V specification
Trans former Model: KM-2070P-220

If power voltage switching connector is wrongfully set, control box can be damaged.
In case that changes voltages between the phases 110V series and 220V series and 380V~440V
series transformer should replace.

Input Voltage

95V~105V
106V~115V
116V~125V

JP3
JP4
JP5

Location of Power Voltage

Switching Connector

Input Voltage

190V~210V

211V~230V

231V~250V

JP1
JP2
JP3

Location of Power Voltage

Switching Connector

■ Voltage change of 380~440V specification
Trans former Model: KM-2070P-440

Input Voltage

345V~415V
416V~480V

JP4
JP5

Location of Power Voltage

Switching Connector

Note

[ Power Voltage Switching Connector Setting ]

[ Fig. 11 ]

In case that input
power is over 220V

In case that input
power is 110V series

Power Voltage

Switching Connector

Step Motor Driving Board

KM-2070P Machine Control Box

Cooling Fan

Digital Board

Power Board

Transformer

Servo Motor Driving
Board

200V 220V 240V 380V 440V

100V 110V 120V

▼JP1 ▼JP2P4▼JP3 ▼JP4 ▼JP5

A. Internal Wiring of Control Box (Common in all types)

9) Cable Connection to Control Box

See “Block Wiring Diagram”.

·[Fig. 20] is wiring diagram based on KM-2070-7L and KM-2070-7M model and the wiring in case that
selected knee lifter switch (including presser foot solenoid) for option.

·As KM-2070-L and KM-2-70M model are none-thread cutting type, it does not need to connect cable
for thread cutting, wiper, tension release solenoid.

·Switch cable consists of two; white and blue connector(knee-lifter switch is option)
White connector: Connect reverse button (A button)
Blue connector: Connect presser foot lifter switch (connect presser foot solenoid cable as well.)
In case of power cable connection, pay attention to fix to table that interference does not occur with
belt.

Note

[ Fig. 12 ]

B. External Wiring of Control Box

[ Fig. 13 ]

Cooling Fan

Control Box

Digital
Board

14. Step Motor Driving Signal Cable

15. Servo Motor Driving Signal Cable

16. Servo Motor Auxiliay Signal Cable

21. Cooling Fan Cable

18. Servo Motor Power Cable

20. Solenoid Power Cable

6. Encoder Cable (Green)

5. Synchro Cable (Black)

3. Pedal Cable (Yellow)

4. Sensor Cable

26. Main Motor Cable

24. Reverse Switch Cable

25. Auto Presser Foot Lifter Switch Cable
※ B/T Step Motor Origin Seneor Cable

1. Operation Panel Cable

11. Back Tag Solenoid Cable (White)

9. Wiper Solenoid Cable (Blue)

8. Thread Cutting Solenoid Cable (Red)

7. Presser Foot Solenoid Cable (Yellow)

10. Tension Release Solenoid Cable (Green)

27. Step Motor Cable

17. Power Switch Cable

Trans

Trans

Power Board

Power Board

J1

J1

Digital Board

J3

J2

J10

J9

J15

J8 J4

J5 J6 J7

J13

J2

J18

Step Motor Driving Board

Servo Motor
Driving
Board

Main Motor

Driving Board

Step Motor

Driving Board

J3

J16
J17

J5
J6

J6
J7

J5

J14

J4

29. Dial OP Connect Cable

28. B/T Step Motor

16

Control Box

10) Exchanging the Fuse

(1) Power board

·connection part of fure for shade part (total 6)

(2)Main motor driving board

15A : For the protection of main motor driving board power.

0.5A: For the protection of main motor driving board control power.

·Fuses are used

·To prevent from electric shade, trun off the power and wait 5 minutes, then open the cover.

·Be sure to turn off power and exchange into the fuse of the designated quantity after opening
the cover of control box.

Danger

No.

F6

F5

F4

F3

F2

F1

Quantity

5A

7A

0.5A

0.5A

0.5A

5A

Use

For the protection of main power

For the protection of solenoid

For the protection of air valve

For the protection of cooling fan

For the protection of step motor

For the protection of step motor
driving board control power

11) Head Earth Connection

Please connect the header earth connection of KM-2070P as the following pictures.

Header earth

connection

Servo motor earth

connection

Servo motor

Control Box

The back of KM-2070

Earth connection

inside control box

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17

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5

1) How to Fill Iubricating Oil

2) How to Set a Needle

A. Push the head backward.
B. Fill lubricating oil up to the line marked “HIGH”.

A. Place the needle bar① to the highest location by turning

the sewing machine pulley .
B. Unscrew the needle fixing screw②.
C. The long groove of needle③ turning to the front, insert it

until the top end of needle reaches to end of the insertion

hole of the needle bar and fasten the needle fixing screw

②tightly.

[ Note ]

Supply the oil immediately when it gets lower to the line
marked “LOW”.

[ Fig. 15 ]

3) How to Remove Bobbin Case

A. Raise the needle higher than needle plate by turning the

sewing machine pulley .
B. Remove the bobbin case by pulling out the guip ① of

case.
C. Detaching the handle①, bobbin② is detached.

[ Note ]

In case of thread trimming type, no-load operation
prevention spring②is attached in bobbin case in order
to prevent no-load operation of bobbin.

[ Fig. 16 ]

①

①

②

②

③

③

HIGH LOW

[ Fig. 14 ]

19

5) How to Wind lower Thread

[ Fig. 18 ]

4) Bobbin Case Attachment Method

A. Adjust base line of thread take-up lever to meet with U

mark of faceplate by turning sewing machine pulley.

B. Make the thread wornd to left and raise the bobbin and

put into the bobbin case.

C. Make the thread go through thread groove① and pass

through bottom of spring②.

D. Make the thread go through thread groove③once again

and pull it from thread guide part④.

· Properly select and use the thread guide part as
shown in the figure according to the machine type.

E. Confirm whether the bobbin rotate to the left upon taking

out the thread.

F. Raise the grip⑤of bobbin case and put the bobbin case

into hook.

[ Fig. 17 ]

[ Note ]

Please make the amount of thread being wound to be 80%
to the maximum.

①

②

③

④

⑤

④

③

②

①

KM-2070-L

KM-2070-L

KM-2070-7M

KM-2070-M

⑤

⑦

⑥

⑧

A. Lower Thread Winding

a. After passing the thread through hole①, turn it from the

behind of tension adjustment dish②to the front.

b. Bring the thread to bobbin ③ and wind 5~6 times to

clockwise direction from the bottom.

c. Making pulley⑤to reach to V-belt by pushing lever ④

and then operate the machine.

d. Upon the lower thread is wound all to bobbin, the

pulley automatically detaches from V-belt.

e. Proper amount of thread wound to bobbin is about

80%.

B. Adjustment of Lower Thread Winding

a. In case that the lower thread is irregularly wound, adjust by unscrewing and moving the screw⑥ to the left and

right and then fasten it again.

b. Winding amount of the lower thread increases turning the adjustment screw⑦ to clockwise direction and

decreases turning to the opposite direction.

c. Tension adjustment of lower thread being wound to bobbin gets strong turning the nut⑧to clockwise direction

and gets weak turning to opposite direction.

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6) Upper Thread Passing Method

After making base line of thread take-up lever to match with
U mark on the face plate by turning the sewing machine
pulley (Up stop location of need), hang the upper thread as
shown in the figure.

[ Fig. 19 ]

7) Adjusting of Stitch Number

※ Regular Sewing (Forward Sewing)

When the feed adjustment dial ① is turned right and left,
the number displayed in ② is changed. As the number
displayed in ② gets bigger, the stitches will be longer in
the case of regular sewing.

※ Condense Sewing (Backward Sewing)

When the condense adjustment dial ③ is turned right
and left, the number displayed in ④ is changed. As the
number displayed in ④ gets bigger the stitches will be
longer in the case of condense sewing. When the LED
above FWD turns on, the machine works in the regular
sewing (forward sewing) direction. And when the LED
below BWD turns on, the machine works in the backward
sewing direction.

[ Fig. 20 ]

①

②

⑤

③

④

⑥

20

1) Sewing Method

A. Turn on the power switch.
B. Execute required settings such as [sewing pattern] or

[width] on the operation panel.
C. Set the stitch width with feed adjustment dial.
D. Step the pedal and start sewing.

[ Fig. 21 ]

Width

Stitch width

↓

↑

6

21

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[ Note ]

· Please attach protection device for safety.
Using without attaching this device, it becomes cause of injury.

· Please turn off the power in the following cases.
Pedaling by mistake, the sewing machine operates and it becomes cause of injury.

- Upper Thread passing

- Exchange of bobbin or needle

- When not using the sewing machine, or in case of being away from the sewing machine

· Please do not touch or press the operating part while sewing.
It becomes cause of injury or breakage of sewing machine.

· Do not touch the solenoid part in case of the sewing machine with automatic presser foot lifter. You can get burns
upon touching it.

Warning

As the machine was set to the optimal status at the moment of factory shipping, do not adjust the machine
status optionally and when exchanging the parts, please change with the genuine parts that the company
authorizes.

1) Thread T ension Adjustment

A. Lower Thread T ension

Adjust tension of lower thread by turning the thread
tension adjusting screw① of bobbin case. Turning to the
clockwise direction, tension gets strong and turning to the
opposite direction, it gets weak.

[ Fig. 22 ]

[ Fig. 23 ]

Adjust tension of upper thread after adjusting the tension
of lower thread.

1. Put down the presser foot.

2. Adjust by turning tension adjusting nut②.

3. After adjusting tension of upper thread, check whether
rotary dish③ rotates with the upper thread by pulling
the upper thread to the arrowed direction.

·In case that it does not rotate, tighten the auxiliary

thread tension adjusting stud④.

B. Upper Thread T ension

[ Note ]

If tension of auxiliary thread adjusting device stud④ is too
weak, thread slides and so rotary dish③ becomes not to
rotate.
Auxiliary thread adjusting device stud should be adjust as
weak as possible that rotary dish③ rotates smoothly.
Use thread tension adjusting spring in accessory box in
case use thick thread or adjust upper thread tension
(Recommend three ply or thicker thread)

Strong

①

②

③

④

Weak

Strong

Strong

Weak

Weak

22

7

23

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2) Presser Foot Pressure Adjustment

Adjust pressing pressure as weak as possible in order not to
be slid the cloth.

A. Unfasten the pressure adjusting screw nut①.
B. Adjust pressing pressure by turning pressure adjusting

screw②.

C. Fasten the pressure adjusting screw nut①.

[ Fig. 25 ]

C. Adjustment of Thread Take-Up Spring

Standard location of thread take-up spring is 6-8mm of
distance to face of thread guide③ on condition that put
down the presser foot②.

1. Put down presser foot②.

2. Unfasten the fixing screw④.

3. Adjust location by turning main thread tension
adjusting device⑤.

4 Unfasten the fixing screw④ firmly.

[ Fig. 24 ]

3) Presser Foot Height Adjustment

When put up the presser foot① by presser bar raiser ②,
standard rising amount of presser bar is 6mm.

A. Unscrew the joint screw③ (2 pieces) and remove

faceplate guard④.

B. Unfasten nut⑤, and pressure adjustment screw⑥

inorder not to be given pressing pressure.
C. Put up the presser foot① by presser bar lifter⑨.
D. Unscrew joint screw⑦, move up and down the presser

bar⑧ to adjust height of presser foot① to 6mm.
E. Fasten the adjustment screw⑦.
F. Adjust pressing pressure by pressure adjustment screw

⑥ and tighten nut⑤.
G. Attach the face plate guard④ with joint screw③

(2 pieces).

[ Fig. 26 ]

①

⑥

④

③

⑦

⑨

①

⑧

6mm

⑤

②

②

⑤

③

①

④

↓

↑

4) Feed Dog Height Adjustment

Standard height is 1mm when the feed dog① went up the
most from needle plate upper face.

A. Make the transfer value① to stop at the highest location

by turning the sewing machine pulley.
B. Lay down the sewing machine.
C. Unscrew the fixing screw②.
D. Adjust feed dog support④ making to move up and down

by turning the eccentric axis③ of feed dog support.
E. Fasten fixing screw② tightly.

[ Fig. 27 ]

The highest location

Standard

the Lowest lacatiobn

5) Feed Dog Slope Regulation

When the feed dog① went up to the maximum from
upper face of needle plate, standard slope is made
that upper face of needle plate and upper face of feed
dog should be parallel.
(0 mark on eccentric axis ② of feed rolling bracket
matches with the mark on feed rolling bracket③.)

A. Make the feed dog① to stop at the highest location by

turning the sewing machine pulley.
B. Lay down the sewing machine.
C. Unscrew 2 pieces of stop screw④.
D. Adjust eccentric axis②of feed rolling bracket by turning

within 90°to arrowed direction against standard location.

· Place the slope of upper face of feed dog① downward
direction to the user's side in order to prevent
puckering. (Figure A)
Place the slope of upper face of feed dog① upward to
the user's side to prevent the cloth to go crisscross.
(Figure B)

E. Fasten fixing screw④ (2 pieces) tightly.

Adjusting the slope of feed dog①, height of feed dog①
and location front and back changes. Hence, please
adjust again.

[ Fig. 28 ]

User’s side

24

①

④

③

②

①

②

④

(A Fig.)

(B Fig.)

③

25

R

6) Feed Dog Front and Back Adjustment

Gap front and back to the needle plate when the feed dog①
moved closest to the user's side and when it moved to the
most backward by turning the sewing machine pulley
becomes regular.

A. Lay down the sewing machine.
B. Unscrew the fixing screw② (2 pieces).
C. Adjust by turning the feed rolling bracket③ and then

moving the feed dog①.

D. Fasten fixing screw② tightly.

[ Fig. 29 ]

7) Needle and Transfer T iming

Make 0 mark of feed cam bearing cover② and 0 mark of
feed cam connection rod③ to match each other when
matched base line of thread take-up① to C mark of face
plate.

A. Lay down the sewing machine.
B. Match the base line of thread take-up① to B mark of face

plate.

C. Unscrew the fixing screw (4 pieces) of lower shaft timing

pulley .

D. Turn the feed cam bearing cover② and match 0 mark to

the 0 mark of feed cam connection lot③.

E. Fasten fixing tightly (4 pieces) of lower shaft timing pulley.

[ Fig. 30 ]

be fixed

be fixed

①

②

③

②

①

③

↓

↑

↓
↑

8) Needle Bar Height Adjustment

When the needle bar① came to the lowest point, height
is from upper face of auxiliary needle plate② to the bottom of
needle bar①, match to the height of timing gauge A③ of the
parts.

A. In case of thread cutting type, take off presser foot④,

needle plate⑤, auxiliary needle plate②, and needle plate
spacer⑦.

B. Place auxiliary needle plate② to the needle plate

attachment face on sewing machine bed.

C. Put the needle bar① to the lowest point by turning the

sewing machine pulley .

D. Attach needle plate spacer⑦(in case of thread cutting

type) that from upper face of auxiliary needle plate ② to
the bottom of needle bar① should be height of timing
gauge A③.

※ When adjusted needle bar height, adjust timing of

needle and hook as well.

[ Fig. 31 ]

26

⑦

②

①

③

②

⑤

④

⑥

R

27

9) Needle and Hook Timing

A. Turn on the power switch.
B. Press N1 and N2 key on the operation panel at the same time.

(Refer to hook test function in 14-3)

C. Take off presser foot, needle plate, auxiliary needle plate, feed dog, and

needle plate spacer.

D. Place auxiliary needle plate① to needle plate attachment part of sewing

machine bed.

E. When matched from the upper face of auxiliary needle plate ① to the

bottom of needle bar② with height of timing gauge B ③ by turning
sewing machine pulley and raising the needle bar② higher than the
lowest point, check the followings:

· Match the sharp end④ of hook with center of needle.

· Interval of sharp end④ of hook and needle is 0~0.05mm.

F. If the above status is not made, adjust location of hook⑤ by unscrewing

the hook fixing screw.
After adjusting, fasten the fixing screw.

G. When the needle is at the closest location to the left, if point ④ of hook

matched to the center of needle by turning the sewing machine pulley,
check whether size of point④ of hook is 0.2~0.5mm from the upper end.
※ If the size does not meet, adjust height of needle bar.

H. In case that over-lapped section sewing causes needle flow, make

needle support to contact to needle by bending needle support⑥ as
shown in the figure (a).
※ Since then, check whether interval of point④ of hook and needle is

0~0.05 mm.

I. Pressing PARA/SET key on operation panel, it is converted to

embroidery available status.

■ In case of using 10mm

1) Move the location of needle to the leftest place.

2) When point④ of hook matched to the center of needle by turning the
sewing machine pulley, adjust needle position whether distance is

0.2~0.5mm to point④ of hook from the upper end of needle hole.

3) In case of using ZigZag width 10mm, change needle plate, feed dog,
needle bar stopper for 10mm.

[ Fig. 33 ]

10) Location Adjustment of Hook Holder

Adjust that end of hook holder① should come to the location
0~0.05 away from end of A part of internal hook②.

※ Keep end of hook holder① never comes out to the right

than end of A part of internal hook②.
A. Unscrew the fixing screw③ and adjust location of

hook fixing ①.

B. Fasten fixing screw③ tightly.

[ Note ]
As thickness of needle plate and auxiliary needle plate① is

different, must use auxiliary needle plate② for sure.

[ Fig. 32 ]

ZigZag Width 0mm

ZigZag Width Max.

④

→←

←→

←→

④

0~0.05mm

←

0~0.05mm

←

→

0~0.05mm

0~0.5mm

0.2~0.5mm

④

⑤

⑥

(가)

①

①

③

󳟆

②

③

①

②

③

[ Fig. 34 ]

[ Fig. 35 ]

11) Synchronizer Adjustment

A. Mounting of synchronizer

ⓐ Fix the synchronizer to back side of arm.
ⓑ After setting the location of pulley that interval

between synchronizer and pulley becomes 1mm,
fasten pulley joint screw.

B. Needle Up Stop

ⓐ Turn off the power switch.
ⓑ Unfasten fixing screw①(2 pieces).
ⓒ Moving the fixing screw① to rotating direction of sewing machine pulley, needle bar② stops at high position.
ⓓ Fasten the fixing screw①.

C. Adjustment of needle down stop location

Do not adjust needle down stop location.

When turn the power switch on and stop the sewing machine at the location of needle up stop, base line of thread
take-up stops at around U mark on face plate (+-3mm). When stop the sewing machine at location of needle down
stop, base line of thread take-up stops at around D mark on face plate (+-4mm).

[ Note ]

·Attachment location of synchronizer was set at the moment of shipping. When taking off the pulley, do not take off
the synchronizer. Also, attach the fixing screw(2 pieces) of pulley to around of the screw of upper shaft against the
pulley rotating direction.

Needle
up stop

Rotating direction

Needle down stop

28

Upper
shaft

Magnetic Holder

Pulley joint screw

Pulley

Synchronizer

1mm

←→

←→

←→

29

12) Lubrication Adjustment for Hook

When you replace the hook or change sewing speed, adjust lubrication amount of hook as the following order.

13) Adjustment of Upper Thread Remainder after Thread Cutting

Standard remainder of upper thread after thread cutting is as shown in the following table according to thread type.

[ Fig. 36 ]

■ Confirmation of lubrication amount
A. Perform no load operation over 1 minute at rotation

number of sewing machine that actually sews.

B. After inserting the lubrication check list① to the left of

hook, operate the sewing machine for about 10
seconds at the speed number of sewing machine that
actually sews. (Quality of lubrication check paper①
does not matter.)

C Confirm the oil quantity spread on the paper.

※ You must check the average lubrication amount

by repeating 3~4 times.

[ Fig. 37 ]

■ Lubrication Adjustment
A. Lay down the sewing machine.
B. Adjust lubrication amount by turning oil adjusting

screw③.

C. Confirm the lubrication amount by referring to

[Confirmation of lubrication amount] above.
※ Repeat adjustment of oil adjusting screw③ and

confirmation of lubrication amount until it becomes
proper amount.

D. After sewing for about 2 hour, confirm the lubrication

amount again.

<Over Lubricated> <Properly Lubricated> <Less Lubricated>

→

←

→

←

←→

25mm

50mm

5~15mm

②

①

①

③

Upper Thread

Filament #60

Span(dex) #60

Upper Thread Remainder

50~60mm
40~50mm

R

[ Fig. 38 ]

■ Adjusting Upper Thread Feeding Wire
After unfasten the fixing screw①, adjust remainder of

upper thread by moving upper thread feeding wire②.
In order to make the remainder short, move to arrow
A direction and to make the remainder long, move to
arrow B direction.

[ Note ]
If tension of auxiliary thread tension adjusting device
stud③ is too strong, it becomes difficult to adjust
remainder of upper thread.
Adjust auxiliary thread tension adjusting device stud③ as
weak as possible that thread adjusting device dish④
rotates gently.
※ At this time, upper thread tension changes and so

adjust upper thread tension.

[ Fig. 39 ]

30

③

④

①

AB

②

→←

31

14) Location Adjustment of Thread Cutting Cam

Adjust as shown in the figure on condition that mess unit① is properly attached.

[ Fig. 40 ]

■ Left/Right Location Adjustment
A. Lay down the sewing machine.
B. Unscrew the fixing screw②.
C. Adjust by operating thread cutting operation crank

stopper④ that section of mobile mess③ enters

about 0.5mm more than section of mess bracket①.
D. Fasten fixing screw② tightly.
E. Unscrew the stop screw⑤ and⑥.
F. While pressing thread cutting roller arm⑦ by hand,

adjust left/right location of thread cutting cam that

thread cutting roller comes in and out of groove

straight line partⓐ of thread cutting cam⑨ easily.
G. Fasten the stop screw⑤.
H. Fasten stop screw⑥ tightly by closing thread cutting

cam collar⑩ to thread cutting cam⑨.

[ Fig. 41 ]

■ Adjustment of Rotating Direction
A While pressing thread cutting roller arm⑦ by hands,

turn the sewing machine pulley toward oneself slowly
and when base line of thread take-up⑪ matches with
T mark of face plate, adjust rotating location of thread

cutting cam⑨that mess starts to move.
B. Fasten stop screw⑤ tightly.
C. While pressing thread cutting roller arm⑦ by hands,

turn the sewing machine pulley toward oneself and

check whether mess starts to operate when base line

of thread take-up ⑪ matches with T mark of face

plate and mess returns to the original status until it
matches with U mark.

R

②

①

0.05mm

④

③

⑨

⑧

ⓐ

⑦

⑥

⑤

⑩

←

←

⑨

⑧

⑦

⑥

⑪

⑤

⑩

15) T ension Adjustment of Lower Thread Presser

After cutting thread, adjust tension when pulling out the thread holding by lower thread presser① to 0.03~0.08N(3~8gf)
in case of filament thread (#60).

[ Fig. 42 ]

A. T ake of f mess unit②.
B. Draw out the mobile mess④ by moving handle③ and

hang the thread on the groove as shown in the figure.

C. Cut the thread by turning the mobile mess④ to original

status. Then, measure the tension when pulling out the
thread holding by lower thread presser①.

D. Adjust tension of lower thread presser① to 0.03~0.08N

(3~8gf) by turning screw⑤.

16) Exchange of Fixed Mess and Moving Mess

[ Fig. 43 ]

■ Removing method
A. Remove joint screw① and ②, and remove mess

unit③.
B. Remove joint screw④ and remove mess presser ⑤.
C. Remove fixed mess⑥ and mobile mess⑦.

[ Fig. 44 ]

■ Attachment Method
A. Attach fixed mess⑥ and mobile mess⑦ to mess

bracket⑧.
B. Attach mess presser⑤ with joint screw④.
C. Put mess unit③ close to section of needle plate ⑨

and attach with joint screw① and ②.

32

③

⑤

④

②

①

①

③

②

⑨

④

⑤

⑦

⑥

⑧

33

17) Gauge Parts

18) Adjustment of the Device for Rasing Presser
Foot Minutely .

In case of using presser foot, needle plate, and feed dog for other except 8mm of width, when operating the sewing
machine, needle can contact to needle plate or needle can be broken. Hence, limit width as follows and exchange
needle bar stopper.

※ Needle bar stopper for other 8mm can be mounted as standard parts according to specification. In such case,

check the parts by L size.

[ Fig. 45 ]

■ Replacing Method of Needle Bar Stopper

· In case of using presser foot and needle plate (option

parts) for 10, 8,5, and 3mm of width, exchange the
needle bar stopper for 10,8,5 and 3mm.

A. Remove needle bar stopper② by unscrewing the

fixing screw① (2 pieces).

B. Attach needle bar stopper③ inserted into needle bar

stopper plate②.

C. Attach needle bar stopper plate② to head part of

sewing machine and fasten fixing screw① tightly.
D. T urn on the power.
E. Set the width to the maximum width of gauge.
F. Confirm that needle hole of needle and each gauge

part, and needle bar and needle bar stopper③ do not

contact by turning the sewing machine pulley by

hands.

A. T ake down the presser foot.
B. Unfasten the nut① in back side of sewing machine.
C. Adjust the proper presser of wroking fabric and presse

foot by twiming the screw②.

D. Fasten the nut① tightly.

R

Classification

A
B
C
D

L(mm)

16.4

18.4

13.4

11.4

Remarks

For 8mm, basic specification

For 10mm

For 5mm
For 3mm

L

①

②

③

①

②

[ Fig. 46 ]

19) Method of Setting the Starting Point

1) Select No.1 straight line pattern.

2) Set the forward and reverse stitch length of the Dial O/P at “0”.

3) Insert a piece of paper and check to see if the paper is being
pushed back and forth when manually turning the pulley.

KM-2070P B/T

Starting Point

Setting Flow

The setup of the

KM-2070P B/T starting

point is completed.

As in the existing KM-2070P model, perform the setting of machine

and install the control box.

1) Install the B/T motor and starting point sensor.

2) Connect the B/T motor and the starting point sensor cable.

3) Install the Dial O/P and connect the cable to the digital B/D.

4) Adjust to make the starting point sensor film positioned at
the center of the sensor with the value of motion reading “0”.

Turn the power on. Check the right and left starting points of

the needle bar, and the front and back starting points of the B/T.

< To set at name stitch >
Value of the E-side : 99stitch
Value of the F-side : 0 stitch

Auto function is on

1) Insert the paper and press the pedal to start sewing (99 stitches
will be sewn).

2) Readjust the starting point sensor film position according to the
degree of paper being pushed.

Adjustment of the starting point

of the needle bar

YES

YES

YES

YES

NO

NO

NO

NO

1) Perform the basic adjustment by adjusting the starting point
sensor film position.

2) Set the starting point again by repressing No.1 pattern key.

1) Perform the minute adjustment by adjusting the eccentric pin
of the feed regulator.

2) Reset the starting point by pressing N0.1 pattern key.

3) Perform the sewing again.

1) Perform the minute adjustment by adjusting the eccentric pin
of the feed regulator.

2) Reset the starting point by pressing No.1 pattern key.

3) Perform the sewing again.

1) Select No.7 L-stitch pattern (set the vertical stitch at 4 and the horizontal stitch at 2)

2) Conduct the sewing test against the 10 basic expanded patterns.

Starting point

of the needle bar

(OK?)

Is the paper

being pushed back

and forth?

Is the paper

being pshed back

and forth?

Is the

sewing status

is good?

34

Please execute trimming every day in order to maintain function of the sewing machine and use for long. Also in case that
it was not used for long, use the sewing machine after trimming as followings.

NNoottee

·Turn off the power switch before work.
Stepping on the pedal by mistake, it becomes cause of injury as the sewing machine starts operation.

·When handling lubricant, use protection glasses or protection gloves that it does not contact to eyes or skin.
It becomes cause of inflammation. Also do not drink lubricant. It can cause vomiting.
Place it where children cannot reach.

A. Put up the presser foot.
B. Remove the joint screw① (2 pieces) and remove needle

plate②.
C. Remove dust on the feed dog② by using smooth brush.
D. Attach needle plate② with joint screw① (2 pieces).
E. Remove bobbin④ case.
F. Remove dust on hook⑤ with smooth cloth and if there is a

scratch or not clean or remove.
G. Take of f bobbin from bobbin case④ and wash out the foreign

substances from bobbin case④ with cloth.
H. Put bobbin into bobbin case④ and set bobbin case④ to

sewing machine.
I. Lay down head part of sewing machine.
J. Wash foreign substances on remove, clean⑥ with cloth.
K. If oil is lower than arrow of <LOW>, supply lubricant.

※ Use the designated oil for lubricant.

※ When lubricant gets dirty, remove oil fan cork screw and

replace lubricant.

※ Wash foreign substances stuck on magnet⑦ and oil fan.

※ Dispose waste oil properly pursuant to regulations.

L. Return the head part of sewing machine to original status.
M. Check if lubrication amount of hook is proper.

If it is not proper, handle it by adjusting.
N. If needle is bent or gets stumpy, replace the needle.
O. Check if upper thread passes properly.
P. Execute test sewing.

[ Fig. 47 ]

[ Fig. 48 ]

[ Fig. 49 ]

35

8

①

②

③

⑤

④

④

⑥

⑦

R

36

In case of using feed dog on the market, process the feed dog as shown in the figure.
※ If you use the feed dog without processing, rotary mess and fixed mess are damaged.

9

←

←

←

←

←

←

←

→

4

0.5

1

15

15

R5.5

←

→

Order

1

2

3

Failure Status

Problem in machine
driving and operation

Failure Cause

Excessive relaxation of belt tension or
belt breakage

Short of fuse for power supply or circuit

Actions

Belt tension adjustment and belt replacement

After checking short of main motor drive fuse
in control box and replace

Defect of Stop Location

Relaxation of main driving belt

Defect of synchro location

Belt tension adjustment

Readjustment of synchro location

Needle broken

4

Cutting phenomenon of
thread

Damage to needle (bending of needle
or abrasion and deformation of needle
hole or groove in groove part and
needle string)

Needle replacement

Mounting of wrong needle Proper mounting of needle
Contact of needle and shuttle Interval adjustment of needle and shuttle
Thread inserting is not correct

Strong tension of upper thread and
lower thread

Proper insertion of needle

Defective mounting of needle (height,
direction and etc.)

Needle remounting

Needle damage (bending or abrasion
and deformation of needle hole or
groove in groove part and needle string)

Needle replacement

Tension adjustment

Excessive spring tension and operation
of thread take-up spring

Adjustment of thread take-up spring tension
and operation

·Check the below points before you request the repair service.

·If the below process does not improve the status, turn off the power switch and ask to the purchase sales agent.

Danger

·Turn off the power switch before work and pull of the plug.
If you step on the pedal by mistake, the sewing machine starts operating and it becomes cause of injury.

10

37

R

38

Order

5

6

7

Failure Status

Skip of sewing point

Failure Cause

Using bent needle
Using improper needle comparing to

using thread
Defective needle mounting
Improper needle and hook timing

Weak upper thread tension
Weak lower thread tension
Improper needle and hook timing

Defective location of thread cutting cam

Interval of groove on needle and hook
point is too large.

Excessive spring tension and operation
of thread take-up spring

Exchange tension of mobile mess and
fixed mess is relaxed.

Abrasion of groove on knife part of
mobile mess and fixed mess.

Needle replacement

Needle replacement
Needle remounting

Readjustment of needle and hook timing

Upper thread tension adjustment
Lower thread tension adjustment
Readjustment of needle and hook timing

Readjustment of thread cutting cam location

Readjustment of needle bottom dead point

Adjustment of thread take-up spring tension
and operation

Tension adjustment of fixed mess

Replacement of mobile mess and fixed
mess

Actions

Defective Thread Jointing
Status

Occurrence of thread
Cutting mistake

11

39

R

12

40

41