SunStar KM-1172BLX, KM-1172BLX-7, KM-1170BLXH, KM-1170BLX, KM-1170BLX-7 User Manual

1) FOR AT MOST USE WITH EASINESS,
PLEASE CERTAINLY READ THIS MANUAL
BEFORE STARTING USE.

2) KEEP THIS MANUAL IN SAFE PLACE
FOR REFERENCE WHEN THE MACHINE
BREAKS DOWN.

MMMMEE--112200220011

USER

’’

S MANUAL

KM-1170 SERIES

1-Needle, Unison Feed
Lock Stitch M/C

KM-1172 SERIES

2-Needle, Unison Feed
Lock Stitch M/C

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Best Quality

Best Price

Best Service

SSUUNNSSTTAARR CCOO..,, LLTTDD..

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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.

4

Contents

1. Machine safety regulations --------------------------------------------------------------------- 6

1-1) Transporting machine --------------------------------------------------------------------------- 6
1-2) Installing machine --------------------------------------------------------------------------------- 6
1-3) Repairing machine -------------------------------------------------------------------------------- 6
1-4) Operating machine ------------------------------------------------------------------------------- 7
1-5) Safety devices ------------------------------------------------------------------------------------- 7
1-6) Caution mark position ---------------------------------------------------------------------------- 8
1-7) Contents of marks -------------------------------------------------------------------------------- 8

2. Names of main parts ------------------------------------------------------------------------------- 9

3. Specifications

--------------------------------------------------------------------------------------- 10

4. Installation

-------------------------------------------------------------------------------------------- 12

4.1) Installation place --------------------------------------------------------------------------------- 12

4.2) Machine delivery --------------------------------------------------------------------------------- 12

4.3) Bending the machine backwards ----------------------------------------------------------- 12

4.4) Table drawing ------------------------------------------------------------------------------------ 13

4.5) Installation of Sewing Machine Body ------------------------------------------------------- 15

4.6) Supplying oil -------------------------------------------------------------------------------------- 21

4.7) Trial run (Pedal operation) -------------------------------------------------------------------- 22

4.8) Machine Stop Position Check ---------------------------------------------------------------- 22

4.9) Back tack button (thread trimming type) -------------------------------------------------- 23

4.10) Functional description of function switches --------------------------------------------- 23

4.11) Adjusting Parameter of Sub Thread Adjusting Device ------------------------------- 24

4.12) How to Use Dual Tension ------------------------------------------------------------------- 24

4.13) Method for Adjustment of a Potentiometer ---------------------------------------------- 26

5. Preparations for sewing ------------------------------------------------------------------------ 27

5.1) Installing needle --------------------------------------------------------------------------------- 27

5.2) Bobbin Insertion and Removal --------------------------------------------------------------- 27

5.3) Winding lower thread --------------------------------------------------------------------------- 28

5.4) Inserting upper thread -------------------------------------------------------------------------- 28

6. Sewing -------------------------------------------------------------------------------------------------- 29

6.1) Sewing --------------------------------------------------------------------------------------------- 29

6.2) Adjusting thread tension ----------------------------------------------------------------------- 29

6.3) Adjusting upper thread length after trimming -------------------------------------------- 31

6.4) Adjustment of the stitch length --------------------------------------------------------------- 32

6.5) Adjustment of Presser Foot Lift -------------------------------------------------------------- 32

5

6.6) Adjustment of Presser Foot Pressure ------------------------------------------------------ 33

7. Inspecting and checking ---------------------------------------------------------------------- 34

7.1) Regular Check Points -------------------------------------------------------------------------- 34

7.2) Cleaning ------------------------------------------------------------------------------------------- 35

7.3) Daily Cleaning ------------------------------------------------------------------------------------ 35

8. Maintenance and repair ------------------------------------------------------------------------- 37

8.1) Adjustment of Thread Take-up Lever Spring -------------------------------------------- 37

8.2) Adjustment of Thread Guide on Thread Adjusting Device --------------------------- 38

8.3) Adjustment of Feed Dog Position ----------------------------------------------------------- 38

8.4) Height adjustment of feed dog --------------------------------------------------------------- 39

8.5) Adjustment of feed lift shaft cam and lower feed cam -------------------------------- 39

8.6) Needle and Hook Timing ---------------------------------------------------------------------- 40

8.7) Clearance adjustment of hook and opener ----------------------------------------------- 41

8.8) Lubrication adjustment of hook -------------------------------------------------------------- 41

8.9) Adjustment of Presser Foot Height --------------------------------------------------------- 41

8.10) Timing adjustment of the main·auxiliary presser foot and needle -------------- 42

8.11) Trimmer ------------------------------------------------------------------------------------------ 43

8.12) Safety Clutch ------------------------------------------------------------------------------------ 45

9. Causes of troubles and troubleshooting ----------------------------------------------- 46

6

11

Machine safety regulations

Safety instructions on this manual are defined as Danger, Warning and Notice.
If you do not follow the instructoins, physical injuries and machine damages might be occurred.

:

This indication should be observed definitely. If not, there will be a danger during the installation,
conveyance and maintenance of the machine.

:

When you follow this indication, injuries from the machine can be prevented.

:

When you follow this indication, error on the machine can be prevented.

Caution

Warning

Danger

1-1) Transporting

machine

Danger

1-2) Installing

machine

Warning

1-3) Repairing

machine

Caution

Those in charge of transporting the machine should have a full understanding of the
machine. 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 compeletely.

The machine may not work properly or breakdown, if installed in certain places, Install
the machine where the following qualifications agree.
ⓐ Remove the package and wrappings 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.

[Refer] Details for machine installation are described in 4. 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 produced by the company should only be used for

replacements.

ⓓ Put all the safety covers back on the machine after the machine has been repaired.

7

KM-1170/KM-1172 Series were designed as industrial sewing machines to perform
sewing on fabric, leather, and other similar materials. Please observe the following
instructions during machine operation.

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

(needle, shuttle, thread take-up lever, pulley, etc.) when the machine is operating.

ⓓ Keep the covers and finger guard on the machine during operation.
ⓔ Be sure to connect the earthing conductor.
ⓕ Turn off the 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.
ⓘ If possible, install the machine away from source of strong electrical noise such as

high frequency welding machines

1-4) Operating

machine

Warning

Caution

[ Warning ]
Keep motor cover in place before operating, turn off power before inspecting or
adjusting.

1-5) Safety

devices

ⓐ Safety label : It describes cautions during the machine operation.
ⓑ Thread take-up cover : It prevents any contact between body and take-up lever.
ⓒ Belt cover : A device intended to avoid potential risks of getting hands, feet or

clothes jammed by the belt

ⓓ Label for specification of power : It describes cautions for safety to protect electric

shock during the motors’ rotation. (Voltage input / use Hz)

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

ⓑ

ⓐ

ⓓ

ⓔ

ⓒ

8

Caution

1)

3)

2)

1-7) Contents of

marks

Warning

Caution mark is attached on the machine for safety.
When you operate the machine, follow the directions on the mark.

1-6) Caution mark

position

CAUTION

주의

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.

WARNING

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

주의

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.

WARNING

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.

9

22

Names of main parts

① Presser Foot ② Reverse Button
③ Function Switches ④ Oil Window
⑤ Climb Dial ⑥ Thread Winder
⑦ Thread Stand ⑧ Pulley
⑨ Stitch Length Dial ⑩ OP Unit and Panel
⑪ LED Lamp SMPS ⑫ Control Box
⑬ Oil Fan ⑭ Lap Switch

Safety Devices

⑮ Thread Take-up Lever Cover ⒃ Finger Guard

⒔ Belt Cover

[Fig. 2-1]

⑫

⒔

⑧

⑥

⑦

⑤

⑮

③

①

④

⑨

⒃

②

⑩

⑪

⑭

⑬

10

Machine Type

KM-117 󱅢 BLX 󱅢 - 󱅢

Code

Medium and heavy materials

Super heavy materials

None

H

Sewing materials

Code

1 Needle
2 Needle

0
2

Needle

Code

Non-trimming

Trimming

None

7

Trimming

Usage

Lubrication method

Needle

Thread trimming style

Hook

Max. sewing speed [spm]

Thread take-up lever stroke [mm]

Height of feed dog[mm]

Max. stitch[mm]

Needle bar stroke[mm]

Presser foot lifting

Auto thread trimming device

Needle

Available space for sewing[mm]

Motor

Automatic trimmer

Manual backtack lever

utomatic backtack device

Automatic presser foot lift device

33

Specifications

KM-1170BLX

KM-1170BLX-7

KM-1172BLX

KM-1172BLX-7

KM-1170BLXH

KM-1172BLXH

Model name

Specifications

For medium/heavy materials For super heavy materials

Automatic lubrication type

82.8

1.0
12
40
12
20

Horizontal large hook (2.5x)

335 × 148

Clutch (600W) - Clutch (600W) - - -

- Servo (750W) - Servo (750W) Servo (750W) Servo (750W)

-

Basic specifications

-

Basic specifications

--

Basic specifications Basic specifications Basic specifications Basic specifications Basic specifications Basic specifications

-

Basic specifications

-

Basic specifications Basic specifications Basic specifications

-

Basic specifications

-

Basic specifications Basic specifications Basic specifications

1

Non-trimming Thread trimming

3,200

3,500(P=1~8mm)

2,000(P=9~12mm)

3,000

3,000(P=1~8mm)

2,000(P=9~12mm)

2,800(P=1~8mm)

1,600(P=9~12mm)

2,000(P=1~8mm)

1,600(P=9~12mm)

2

Non-trimming Thread trimming

12

Non-trimming

-

Pneumatic cylinder

-

Pneumatic cylinder

-

DP×35 (#12∼#23)
134-35 (Nm80~160)

DP×35 (#22∼#25)

134-35 (Nm140~200)

Manual[mm]
Automatic[mm]

V-Belt

Semi-Direct

11

KM-1170BLX-7 KM-1172BLX-7 KM-1170BLXH KM-1172BLXH

Max. Sewing speed[RPM]

Sweat width[mm]

Control by intersection of presser foot

2,000

Control by intersection of presser foot

1,600

9.0 under

9.0 above

⊙

Speed

KM-1170BLX-7

For medium/heavy materials

For super heavy materials

KM-1172BLX-7 KM-1170BLXH KM-1172BLXH

Max. Sewing speed[RPM]

Intersection of presser foot

3,500(3,000)

3,200(3,000)

2,900

2,600

2,400

2,200

1,800

3,000

2,800

2,600

2,400

2,200

2,000

1,800

2,800

2,600

2,400

2,200

2,000

1,800

1,600

2,000

1,900

1,800

1,750

1,700

1,650

1,600

3.5 under

3.5~4.0

4.0~4.5

4.5~5.0

5.0~5.5

5.5~6.0

6.0 above

1) Max. RPM priority is limited to low RPM.

2) Figures in parenthesis refer to the normal RPM.

3) No speed control function by intersection of presser foot and stitches in case of non-trimming clutch motor specifications.

Note

12

44

Installation

4.1) Installation place

1) Do not install the machine near television, radio or
telephone; or the operation of machine can be
interfered with by the noise from the appliances.

2) Connect the ground (earth) wire. An unstable
connection may result in malfunction

4.2) Machine delivery

1) There should be two people to move the machine, as
in the Figure.

4.3) Bending the machine backwards

1) Bend the machine backwards with two hands
grabbing upper part of the body. Make sure to press
the lower part of the board leg of the machine, or the
whole body of machine falls backwards, leading to
physical injuries.

[Fig. 4-1]

[Fig. 4-2]

[Fig. 4-3]

•Only trained technicians should install and wire up the machine.

•The machine weighs over 50 kg. More than two persons should install the machine.

•Do not plug in the machine until installation is completed.

•If the operator mistakenly steps down on the pedal with the plug in, the machine will start

automatically and can cause physical injuries.

•Use both hands when bending the machine backwards or returning it to the original position. Using
only one hand can lead to severe hand injuries due to the weight of the machine.

Caution

13

4.4) Table drawing

Please use the table provided by Sunstar. When using self-made table , the thick of table should be more than 40mm. Please use table strong enough to sustain

the weight of the machine.

[Fig. 4-4]

Non-trimming

14

[Fig. 4-5]

Thread trimming

15

4.5) Installation of Sewing Machine Body

4.5.1) Hinge and Bed Supporting Rubber

1) Fix the hinge rubber ① (2EA) and the bed
supporting rubber ② (4EA) at the grooves on the
table using nails ③.

2) Adjust the height of the bed and the table with the
accessories that are hinge rubber spacer and bed­support rubber spacer.

It is recommended for the bed to be positioned
2~3mm over the table.

①③

②

4.5.2) Presser Foot Lift Cylinder Bracket

Fix the presser foot lift cylinder bracket① under the
table② as in the figure using the M8 hexagonal bolt
③.

4.5.3) Oil Fan

Fix the oil pan① inside the accessory box with M4

hexagon socket headless bolt② under the table like
the figure. Attach the remained parts using wood
nuts.

[Fig. 4-6]

[Fig. 4-7]

[Fig. 4-8]

②

①

③

16

4.5.4) Lap Switch

Attach the lap switch ① beneath the table ②
considering the user’s working position with screws.

4.5.5) OP Panel

Fix the operating panel① to the bracket② using a
bolt③ and then fix it to the upper part of the rear arm
using a bolt④.
(Optional：Fix the OP bracket⑤ to the table face
using a tapping screw⑥.)

4.5.6) Control Box and LED Lamp SMPS

Attach the control box① and the LED lamp SMPS②
beneath the right side of the table③ using screws
and fix them at the places as in the figure.

①

①

⑤

①

⑥

(Option Specification)

②

③

④

②

[Fig. 4-9]

[Fig. 4-10]

[Fig. 4-11]

②

③

①

21.5mm

90mm

17

4.5.7) Pedal switch and connecting rod

1) Attach pedal switch ① to pedal switch bracket ②

with four bolts ③.

2) As in the Figure, attach pedal switch bracket ②

to the lower part of table.

3) Connect one end of the connecting rod ④ with

pedal switch and the other end with pedal, and
then adjust length of the rod.

4.5.8) Sewing Machine Body

1) Place the two hinges① on the rear bed of the

sewing machine and tightly fasten them using the
screw⑤.

2) As shown in figure 4-14, put the hinge① into the

hinge rubber② on the table③ laying the and put
down the sewing machine on the bed-support
rubber⑥.

3) Insert the machine body sustaining pole④ into

table③ completely. If the pole is not inserted
completely, that may cause accidents because the
pole cannot sustain the weight of machine body
firmly, when the body bent backwards.

4) Install the sewing machine body on the table and

fix the grounding wire⑦ on the hinge① using a
screw⑧.

①

②

③

④

[Fig. 4-12]

[Fig. 4-13]

⑦

⑧

④

①

③

⑤

②

⑥

⑥

[Fig. 4-14]

18

4.5.9) Adjustment of Belt Tension
(Non-trimming model)

1) Semi-direct Drive Motor Specifications
Tightening the screw in the middle of motor bracket

hole① is the standard. However, the tension is
increasing when the screw is tightened on the left of
the motor bracket hole and the tension is decreasing
when the screw is tightened on the right of the hole.

[Fig. 4-15]

2) V-Belt Drive Motor Specifications
Install the motor and sufficiently loosen the fixing

nuts ①, ②. Then due to the weight of the motor ③,
tension is generated at the belt ④. Fix the fixing nut
① in this position and then tightly fasten the fixing
nut ②.
Adjust the tension of the belt to make the belt
pressed 10mm when the center is pressed by a finger
as in the figure, and tightly fasten the fixing nut ②.

①

④

10mm

③

②

[Fig. 4-16]

4.5.10) Belt Cover Installation

(Non-trimming model)

(1) Semi-direct Drive Motor Specifications

Tighten the screws (5EA) firmly.

[Fig. 4-17]

①

19

(2) V-Belt Drive Motor Specifications

1) Fix the belt cover on the upper right side of the
arm ① and the fixing grooves of the belt cover
② using screws ③.

2) Accurately assemble the belt covers②,④ and
fix the belt cover② using screws following the
same method. When the assembled belt cover is
fixed to the stud bolt⑤ using screws⑥, the belt
cover installation is complete.

4.5.11) Pneumatic Parts Installation and
Function Check

1)

As in the figure, fix the pneumatic unit ① to the
lower part of the table using the wood screw and fix
the regulator to the table T-leg stiffened plate ③.

2) Connect the pneumatic tubes according to label
signs and bind the tubes with other lead lines
using the belt clips ②.

3) Use the regulator ④ to set the default pneumatic
pressure at 0.6Mpa.

4) When applying the seam center guide presser
foot, make sure that the pneumatic pressure of the
regualtor ⑤ is no highr than 0.3Mpa.

4.5.12) Description of label symbols

①

②

⑤

⑥

④

③

Label Sign

Classification Function

S1
S2

S3

S4

S5

S6
S7

S8

Backtack
Trimming

Hem height difference

Stitch length conversion

Thread release(Main)

Thread release(Sub)
Presser foot

Seam Center Guide

Add the initial and last backtack sewing function and perform reverse sewing
Perform trimming
When the cylinder is in motion, sewing is performed using the higher

value of the two climb dials attached to the machine.
When the cylinder is in motion, sewing is performed using the lower

value of the two stitch length dials attached to the machine.
It operates when trimming and presser foot automatic lift are

performed to loosen the tension of the upper thread.
Turn on/off the tension of the upper thread using the function switch.
Lift the presser foot 18mm from the top of the needle plate.
It is used to create sewing lines in parallel along the seam in case of

using two needles.

[Fig. 4-18]

However, when the left/right removable thread adjustment device, an optional device is applied, S6
refers to SubL, and S9 refers to SubR.

Note

②

Ⓐ

S5

S1
S2
S3
S4
S6
S7

Ⓐ

KM-1170

KM-1172

Ⓐ

①

③

[Fig. 4-19]

20

4.5.14) Thread spool stand assembly

Secure the thread spool stand assembly① onto the
table using washer② and nut③ on the right side.

①

②

③

[Fig. 4-21]

4.5.13) Pnematic wiring diagram by model

[Fig. 4-20]

KM-1170BLXH
KM-1172BLXH

KM-1170BLX-7
KM-1172BLX-7

KM-1172BLX-7(Option)

Ⓐ

S5

Terminal S5

S5

Terminal S5

Ⓑ

Ⓐ

Ⓑ

S1
S2
S3
S4
S5
S6
S7

S1

S2

S3

S4

S6

S7

S9

S1
S2
S3
S4
S6
S7

up

S7

down

S9

S1
S2
S3
S4
S5
S6
S7

S6
S9

S8

S1
S2
S3
S4
S6
S7

S1

S2
S3
S4

S6

S7

up

S7

down

Ⓐ

S5

Terminal S5

Ⓑ

S1

S3
S4
S5
S6
S7

S1

S3

S4

S6

S7

S1
S3
S4
S6

S7

up

S7

down

21

High

Low

③

②

①

[Fig. 4-22] [Fig. 4-24]

[Fig. 4-23] [Fig. 4-25]

1) Lubrication to Bed
Loosen the oil tank entrance screw ① and supply oil until the oil gauge ② reaches the “HIGH” mark③. When oil
supply is completed, tightly fasten the screw ①. Upon initial installation, run the machine for 30 minutes and
supply oil until the “HIGH” mark.

2) Lubrication to Face Plate
isassemble the faceplate by loosening two faceplate screws and supply oil to the indicated part as shown in the
figure. After lubrication, reassemble the faceplate.

3) Lubrication to Hook
Open the slide plate③ and supply oil to the indicated part as shown in the figure.

4) Oil Window Check
Turn on the power after lubrication on each sliding part and check the oil flow at the oil window⑤ on the front
part of the arm by rotating the sewing machine at low speed for five minutes. Operate the machine at the rate of
2,000spm during four or five days after starting to use it, then machine performance will continue to be in best
shape.

4.6) Supplying oil

•Operate the machine only after supplying oil when the machine is used for the first time or has been
left unused for a long time.

•Only use genuine lubricant of this company. (Lubricant is in the accessory box.)

Caution

•Plug in only after oil supply is finished. If the operator mistakenly steps on the pedal with the plug in,
the machine will start automatically and can cause severe injuries.

•When handling lubricants, wear protective glasses or gloves to prevent lubricants from contacting
with your eyes or skin. Wash your hands in running water with soap when they are smeared with
lubricant. If lubricant is in the eye, instantly wash it with running water and see a doctor.

•Never drink lubricants since they can cause vomiting or diarrhoea. Go to see a doctor, if you
mistakenly drink lubricant.

•Keep lubricant away from the reach of children and the youth.

Caution

④

⑤

④

①

②

③

⑤

N.U

N.D

22

4.8) Machine Stop Position Check

Press the reverse button① to make the needle to the highest and lowest position, and check the stop position of the
machine. When the stop position is improper, trimming may be faulty. In this case, the position of the magnetic
holder imbedded in the pulley should be corrected.

4.8.1) Check for up-stop position of needle
bar

Upper stop position of the needle bar is that the
thread take-up② is on the top. When the position is
incorrect, adjust the magnetic holder③ position built
in the N.U seal of the pulley left and right.

4.8.2) Needle Bar Lower Stop Position Check

The lower stop position of the needle bar is at the
center of needle groove④crosses the surface of
needle plate. When the position is wrong, adjust the
mounted magnetic holder⑤of the N·D imprinted
poly from side to side.

[Fig. 4-27]

4.7) Trial run (Pedal operation)

1) Press pedal lightly to the position of B to check if the

machine is operating low-speed sewing.

2) Press pedal to the position of C to check if the

machine is operating high-speed sewing.

3) Press pedal backward and forward. And then put the

pedal at neutral position of A to check if needle stops
lower than the upper surface of needle plate.(in case
that needle down stop is set)

4) When pressing pedal to the position of D(or pressing

pedal the position of to D and then replacing pedal
to the position of A), needle will stop higher than the
upper surface of needle plate after trimming.

[Fig. 4-26]

Make sure not to touch or press down parts that are operating or moving during operation. Failure to

follow the safety rules may result in physical injuries or mechanical damages.

Caution

23

4.9)

Back tack button (thread trimming type)

Pressing the back tack button or reverse button① during
forward sewing will start reverse sewing immediately .
When you stop the machine and restart it by stepping
down on the pedal with the reverse button① already
pressed down, you can perform reverse sewing from the
beginning. When the machine is in a “stop”mode, you
can change up-down position of the needle bar by
pressing the reverse button. Lightly pressing the button
once will stop the needle bar in a high position.
Pressing the reverse button① twice within less than a
second will stop the needle bar in a low position. In
short, the button delivers two functions: one for reverse
sewing and the other for converting vertical position of
the needle.

4.10) Functional description of function switches

1) : Stitch length conversion switch
When the switch is turned on, the lower positioned
dial among the two stitch length setting dials
attached to the machine is applied. When the switch
is turned off, the higher located dial among the two
stitch length dials is applied.

2) : Auto backtack select switch
The switch selects the addition or deletion of the
initial and last backtack sewing function.

3) : Presser bar overlapping change switch
When pressing the switch, the lamp is on. Then the
presser bar overlapping volume is changed to the value
set at the top cover dial B. When pressing it again, the
lamp is off. Then the value set at the top cover dial A
becomes the presser bar overlapping volume.

4) : Supplementary thread tension switch
When the switch is not pressed, the tread tension is
low. When the switch is pressed, the dish is closed,
and the thread tension increases.

5) : Needle bar upper stop switch
Regardless of the machine stop position, the switch sends the needle bar to the highest stop position.

6) : Seam Center Guide Operation Switch (KM-1172 Only)
The seam center guide operation switch works at the 2 needles and it is used to stitch symmetry line on the
material with stitching line.

7) : Left auxiliary thread tension switch
When the switch is not in operation, the thread tension is released. When the switch is pressed, the left auxiliary

dish is closed, and the thread tension increases.

8) : Right auxiliary thread tension switch
When the switch is not in operation, the thread tension is released. When the stitch is pressed, the right auxiliary

dish is closed, and the thread tension increases.

①

[Fig. 4-28]

[Fig. 4-29]

KM-1170BLX
KM-1172BLX

KM-1172BLX-7
KM-1172BLXH

KM-1172BLX-7

(Option)

KM-1172BLX-7

(Option)

KM-1170BLX-7
KM-1170BLXH

24

4.11) Adjusting Parameter of Sub Thread Adjusting Device

- The default value of A-95 is “0”.

Parameter No. Set Value

Function Name

A-95

0

Press the sub thread tension operation switch to operate second thread tension
adjusting device② when stitching and using main thread tension adjusting device①
then the plate of the device② is closed and the lamp is on at the same time.
After trimming, the sub thread tension switch is automatically turned off.

In the case where A-95’s parameter is set at “1”, the lamp of the sub thread tension
switch is on, and the sub thread adjusting device ② is running like the main thread
adjusting device①.
In this case, even after trimming, the sub thread tension switch is not automatically
turned off.
In order to release the tension of the sub thread adjusting device②, press the sub
thread tension switch to turn it off.

[Fig. 4-30]

4.12) How to Use Dual Tension

1) Main Thread Adjusting Device

- Adjust tension of the main thread adjusting device① in line with the main sewing material conditions.

- Adjust the main thread adjusting device① and the tension of the lower thread in order to create loops at the
center of the sewing material at even stitch length.

2) Sub Thread Adjusting Device

- The sub thread adjusting device② enables users to easily increase the tension of the upper thread according to
the sewing material height difference and conditions.

For two-needle model, if a dual tension individual operating type (optional) is used, the left and right tension of
the upper thread can be independently adjusted while sewing materials with height difference on the left and
right sides.

- The sub thread adjusting device② should be adjusted in line with the tension of the main thread adjusting
device① and the conditions of sewing materials with height difference.

3) Operating Main·Sub Thread Adjusting Devices

- The main·sub thread adjusting devices①, ② are run by pneumatic pressure. In particular, the sub thread
adjusting device② can be turned on and off easily with functional switches.

- The sub thread adjusting device can be left, right independently run as an optional function. The left, right
function switches can be used to turn on and off the tension.

- During sewing, when the sub thread adjusting device or the left, right sub thread adjusting device in terms of
independently running type is pressed, the lamp is turned on and at the same time the tension of the upper thread
increases. When the button is pressed again, the lamp is turned off, and the tension of the upper thread
decreases.

Sub thread adjusting device②

Main thread adjusting device①

(Thread adjusting device for 1 needle) (Thread adjusting device for 2 needles)

1

25

4) Examples of Dual Tension Application
4-1) Basic Specifications

- For the sewing process of handling significant height difference of sewing material, the presser foot cross
overlap and the tension of the upper thread should be increased to get best sewing quality.

- Turn off the dual tension button C and adjust the tension of the main thread adjusting device according to
the conditions of the main sewing material A.

- Turn on the dual tension button C and adjust the tension of the sub thread adjusting device according to the
conditions of the thick sewing material B.

- Proceed with general sewing work after the dual tension button C is turned off. When the machine reaches
Point B on the sewing material, press the dual tension button C to increase the upper thread tension. When
the sewing for height difference is completed, press the dual tension button C to decrease the upper thread
tension and continue sewing.

4-2) Optional Specifications

- When sewing the materials with different height on left and right sides, the independently
operating (optional) dual tension can be used to get the best sewing quality.

- As in Figure 4-26, when sewing the materials with different height on left and right sides,
upper thread tension should be given differently to the left and right sides to get the best
sewing quality. As such, the sub thread adjusting device should be adjusted as follows:

① Basic specifications: The sub thread adjusting device that supplies upper thread to the thick

part A is reset every time of operation.

② Optional specifications: Turn on the button to operate the sub thread adjusting device that

supplies upper thread to the thick part A between the independently operating function
switch’s dual tension L and R.

- After the sewing with height difference is done, manually adjust the tension of the sub thread
adjusting device to return to default value in case of basic specifications, and press the dual
tension L, R button to reduce the upper thread tension in case of the optional specifications.

[Fig. 4-31]

A

B

C

[Fig. 4-32]

A

26

Press and button to move to parameter number 27

After setting is complete, push button to go back to the
initial screen

Set the the adjustment dial for mutual overlapping portion of
presser foot to 3.5[mm] and press the key then the screen
is automatically changed with the buzzer sound.

•Sewing initial screen

•Initial screen for parameter group A

•P1 setting screen for group A item 27

•P2 setting screen for group A item 27

•P3 setting screen for group A item 27

•Sewing initial screen

4.13) Method for Adjustment of a Potentiometer

■■

How to set

■■

Relation between presser foot lifting amount and maximum speed of the sewing machine
(page 11.

⊙⊙

speed Will have to refe )

▶When setting each step of P1, P2 and P3, be sure to press button to save the set value. Otherwise, the set value will

not be saved.

▶If you turn off the power before completing step 10, you will have to start over again.
▶The set value of the Potentiometer will be erased if you initialize. Initialize only when it is necessary. Remember that you

have to reset the Potentiometer after initialization.

▶If the potentiometer connector is not connected or the cabel is broken, the number in display area remains fixed.

DetailsScreen displayHow to operate

Turn on the power

Press button, then press button while holding down

button to change screen

No

1

2

3

4

5

11

Set the the adjustment dial for mutual overlapping portion of
presser foot to 4[mm] and press the key then the screen is
automatically changed with the buzzer sound.

Set the the adjustment dial for mutual overlapping portion of
presser foot to 4.5[mm] and press the key then the screen
is automatically changed with the buzzer sound.

Set the the adjustment dial for mutual overlapping portion of
presser foot to 5[mm] and press the key then the screen is
automatically changed with the buzzer sound.

Set the the adjustment dial for mutual overlapping portion of
presser foot to 5.5[mm] and press the key then the screen
is automatically changed with the buzzer sound.

Set the the adjustment dial for mutual overlapping portion of
presser foot to 6[mm] and press the key then the screen is
automatically changed with the buzzer sound.

Set the the adjustment dial for mutual overlapping portion of
presser foot to 8[mm] and press the key then the screen is
automatically changed with the buzzer sound.

•P6 setting screen for group A item 27

•P5 setting screen for group A item 27

•P7 setting screen for group A item 27

•Set Completion

7

8

9

10

•P4 setting screen for group A item 27

6

27

55

Preparations for sewing

5.1) Installing needle

5.2.1) Bobbin Removal

• Turn the sewing machine pulley to place the
needle above the needle plate.

• Open the sliding plate ① and vertically erect the
flaps holding the bobbin.

• Remove the bobbin from the bobbin case using
tweezers.

5.2.2) Bobbin Insertion

Take out the lower thread from the bobbin through
the thread passage② and below the tension spring
plate③, and make the loose lower thread length
50mm.
Bobbin can be inserted in the reverse order of the
bobbin removal.

[Fig. 5-2]

1) Turn the pulley of machine to raise needle bar to its
highest position.

2) Unfasten the fixing screw③.

3) Place the long groove of the needle① to the opposite
direction of fixation screw③ and push it into the end
of inside as shown in the figure② then tighten the
screw③.

5.2) Bobbin Insertion and Removal

③

②

①

[Fig. 5-1]

Always turn off the power when mounting a needle.
If the pedal is accidentally stepped, the machine might unexpectedly operate, causing injury.

Caution

Make sure to turn off the power switch when removing the bobbin case.
If the pedal is accidentally stepped, the machine might unexpectedly operate, causing injury.

Caution

①

50mm

③

②

②

28

5.4) Inserting upper thread

1) Place the thread take-up ① at its the highest position
by turning pulley before inserting the upper thread.

2) The adequate length of upper thread extending from
the needle hole is 50mm.

[Fig. 5-4]

5.3) Winding lower thread

1) Turn on the power switch.

2) Insert bobbin① into bobbin winder shaft②.

3) Wind thread on bobbin① several times in the arrow
direction.

4) Push bobbin operating plate③ in the direction of
bobbin.

5) Raise presser bar with presser bar lifter.

6) When pressing pedal, the machine starts to operate
and thread winds on bobbin.

7) When thread winding is done, bobbin operating plate
③ returns automatically.

8) Remove bobbin and cut thread with bobbin winder
knife④.

※ To adjust the amount of bobbin winding, loosen

screw⑤ and adjust bobbin winder adjusting plate
③.

①

③

⑤

④

②

90%

[Fig. 5-3]

Make sure not to touch or press down parts that are operating or moving during thread winding.

Failure to follow the safety rules may result in physical injuries or mechanical damages.

Caution

Make sure that thread should be regulated to wind 90% of bobbin capacity.

Caution

Always turn off the power when inserting upper thread.
If the pedal is accidentally stepped, the machine might unexpectedly operate, causing injury.

Caution

①

50mm

29

66

Sewing

6.1) Sewing

1) Press ON button of power switch ①.

2) Lamp on the control panel ② turns on and machine
is ready to operate.

3) Control sewing conditions by using control panel ②.
(See user’s manual of Fortuna IV.)

4) When the button ③ is pressed to LED On, LED
lamp blinks.

5) Step on the pedal to operate.

[Fig. 6-1]

•Wear protective gears for safety. Operation without them may lead to physical injuries.

•Turn off the machine in the following situations.

If the operator mistakenly steps on the pedal with the plug in, the machine will start automatically
and can cause severe injuries.

- When inserting upper thread

- When replacing bobbin or needle

- When the machine not in use or the operator leaving the work place.

Caution

6.2) Adjusting thread tension

Sewing Type

Cause Troubleshooting

Good sewing in balance

Upper thread tension is too weak
Lower thread tension is too strong

Upper thread tension is too strong
Lower thread tension is too weak

Make upper thread tension strong or make
lower thread tension weak

Make upper thread tension weak or make
lower thread tension strong

When inserting and removing bobbin case, make sure to turn off the power switch.
If the pedal is accidentally stepped, the machine might unexpectedly operate, causing injury.

Caution

①

③

②

30

6.2.1) Tension adjustment of the lower thread

If you turn screw② on the spring plate① mounted
in hook in a clockwise direction, the lower thread
tension will become stronger and when turned in a
counterclockwise direction, weaker.

①

②

[Fig. 6-2]

6.2.2) Thread Trimming Sub Thread Tension
Adjusting Device

The tension of thread trimming sub thread tension
adjusting device① should be set lower than the
tension of main thread tension adjusting device②.
Turn the nut③ in a clockwise direction to increase
the tension and turn it counter-clockwise to decrease
the tension.

[Fig. 6-3]

6.2.3) Main thread adjusting device

1) The tension of the main thread adjusting devices
① should be set at the minimum as possible.

2) Loops should be created at the center of the
sewing material. Make sure that thread break
does not occur on the ultra light material due to
strong thread tension.

3) Adjust the main thread adjusting devices① to
create stitches at regular length. When the nut is
turned clockwise, the tension increases. When the
nut is turned counter-clockwise, the tension
weakens.

[Fig. 6-4]

Readjust the tension of main thread tension adjusting device② after adjusting thread trimming sub
thread tension adjusting device.

Caution

①

②

③

①

31

6.2.4) Supplementary thread adjusting device

1) The supplementary thread adjusting devices①
play a supplementary role in strengthening thread
tension in a prompt manner.

2) The tension of the supplementary thread adjusting
devices① should be set lower than that of the
main thread adjusting devices②. The tension can
be turned on/off with the functional switch.

3) The tension of the supplementary thread adjusting
device gets stronger when it is turned clockwise.
It gets weaker when the device is turned counter­clockwise.

[Fig. 6-5]

6.2.5) Operation of thread adjusting device

The main and supplementary thread adjusting
devices①,② are automatically in operation.
※ When trimming or auto presser bar lift③ is

activated, the tension of the main and
supplementary thread adjusting devices is
released. The supplementary thread adjusting
devices② can be turned on/off with the
functional switch④.

[Fig. 6-6]

[Fig. 6-7]

6.3) Adjusting upper thread length after
trimming

1) During thread trimming, only the tension of sub
thread tension adjusting device① works not the
tension of main device.

2) The adequate length of upper thread after trimming
is 50 ~ 60mm.

3) Strengthen the tension of thread trimming sub thread
tension adjusting device① to shorten the upper
thread of the needle after trimming and vice versa.

①

②

④

③

①

②

①

32

6.4) Adjustment of the stitch length

Adjusting dial① and ② designed to control the stitch
length can be set up with two different lengths, and
change the stitch length whenever switch③ is pressed
down. After pressing down switch ③ to turn the switch
on, the sewing machine will carry out sewing at the
stitch length as set on dial②. When pressing down
switch③ again to turn the switch off, the machine will
start sewing at the stitch length as set on dial①.

6.5) Adjustment of Presser Foot Lift

The overlap between the main presser foot① and the
sub presser foot② could be set at 1~8mm using the
climb dials③, ④ which adjust the presser foot lift. Place
the desired numbers of the climb dials③, ④ at the
punched mark⑤, and the main presser foot① and the
sub presser foot② overlap according to the set value. In
addition, during the sewing process when the hem
height difference is high, the lap switch⑥ can be used.
When the lap switch is pressed, the set value at the dial
④ becomes the overlap value of the presser feet. When
the lap switch is pressed once again, the overlap value is
converted back into the value of the dial③.

①

①

②

⑥

⑤

④

③

③

②

[Fig. 6-8]

[Fig. 6-9]

•The set value of the stitch length dial② should be always lower than the set value of the dial①.
Please beware of damage on the parts when turning the dial by force to set the value of the dial② at
the higher level of the dial①.

•The function of the stitch length dial② is available only for trimming type machines. Stitch length dial
① is installed for non-trimming types.

Caution

The set value of the stepped pulley control dial④ should be always higher than the set value of the dial
③. Please beware of damage on the parts when turning the dial by force to set the value of the dial④
at the higher level of the dial③.

Caution

④

33

[Fig. 6-10]

6.6) Adjustment of Presser Foot Pressure

6.6.1) Presser Foot Pressure

1) Adjust the presser foot pressure to remain weak if
possible (to the extent that the sewing fabric is
slipped away)

2) Turn the pressure adjusting dial① to adjust the
presser foot pressure.

3) When the dial is turned clockwise, the pressure
gets stronger. Otherwise, the pressure gets
weaker.

Stitch Type

Cause Solution

Balanced good stitch

Stitch skipped, inconsistent stitch length

Puckering

Increase pressure

Decrease pressure

①

34

77

Inspecting and checking

•Turn off the power switch before operation.

•Pressing pedal by mistake may operate machine and result in injuries.

•When handling lubricants, wear protective glasses or gloves to prevent lubricant from contacting

with your eyes or skin. Wash your hands in running water with soap when they are smeared with
lubricant. If lubricant is in the eye, instantly wash it with running water and see a doctor.

•Never drink lubricants since they can cause vomiting or diarrhea. Go to see a doctor, if you
mistakenly drink lubricant.

•Keep the oil out of the reach of children. Keep the oil away from heat.

•Use both hands when bending the machine backwards or returning it to the original position. Using

only one hand can lead to severe hand injuries due to the weight of the machine.

Caution

To maintain proper performance of machine and use it for a long time, clean machine regularly
according to the following way. Evan when machine is not in use for a long time, clean according to the
following way before using the sewing machine.

Caution

7.1) Regular Check Points

1) Cleaning, lubrication, and grease supply for particular areas should take place on a regular basis to keep the machine at
the best conditions.

2) Check the tension of each driving belt.

3) When the regular checks are not properly performed, the following problems might result.

－ Abnormal abrasion of the oiled parts due to the lacking supply of lubricant and grease
－ Abnormal operation due to the dust and foreign materials stuck around the driving parts

4) If the machine was left unused for a long time, resume its operation after cleaning and maintenance activities.

NO

Checklist Interval of inspection

Around the Hook, Thread trimming, Needle plate, Feed dog

cleaning(fluff, thread, a piece of cloth)

Check the oil amount(changer box, oil pan)

Check the oil flow at the front side of arm

Check hook lubrication

Check V-belt (Non-trimming model) tension

Check the air-pressure regulator Level(water level)

Check oil leak of the machine

Everyday

Everyday

Everyday

One/week
One/week

Everyday

One/month

1

2

3

4

5

6

7

①

②

③

35

7.3) Daily Cleaning

7.3.1) Cleaning

1)Set the needle at the top.

2)Open the slide plate① and separate the bobbin②
from the hook③.

3)Remove dust from the hook③ with soft cloth or
brush and check the damage at the hook.

4)After cleaning install the bobbin② to hook③.

[Fig. 7-1]

7.2) Cleaning

7.2.1) Cleaning Frequency and Method

NO. Required Parts for Cleaning

Around Hook
Thread take-up lever / thread tension adjusting device

Treatment of Waste Oil

Around of moving blade and fixed blade
(Please remove dust on the moving and fixed blade under the needle
plate with air.)

Daily

Once a week

Once a month

Three times a week

1
2

4

3

Cleaning Frequency

1) Make sure to turn off the power of the machine before cleaning.

2) The parts disassembled for cleaning should be assembled in the reverse order of disassembly.

Caution

36

7.3.2) Oil Supply

1) Oil Volume Check

• Look at the oil window② on the bed cover.
When the oil is at the “HIGH” mark③, it
means oil is sufficient.

• If oil is below the “LOW” line ④, supply
more lubricant following the order below.

2) Oil Supply

• Use the authentic SunStar lubricant.
(Lubricant can be found in the accessory box).

• Loosen the oil supply entrance screw ①.

• Supply lubricant until the oil reaches the

“HIGH” line ③ on the oil window of the bed
cover. Make sure that lubricant does not
overflow.

High ③

Low ④

①

②

⑤

⑥

[Fig. 7-2]

7.3.3) Checking

1) If the needle is deformed or the edge is damaged,
replace the needle with new one. (See 5-1 Needle
Installation)

2) Check if upper thread is inserted correctly. (Refer
to 5.4 Inserting upper thread)

3) Run trial sewing.

[Fig. 7-3]

1) Make sure that lubricant does not move above the “HIGH” line ③. If not, lubricant might leak.
When oil supply is completed, tightly fasten the oil tank entrance screw ①.

2) When the sewing machine sits on the table safely, please pay attention to make the oil tank⑤ is
perpendicular. If it leans to one side, oil might leak out.

3) Please make sure that the reflux filter⑥ is on the groove of the oil pan.
Otherwise, oil cannot be properly inhaled.

Caution

37

88

Maintenance and repair

8.1) Adjustment of Thread Take-up Lever
Spring

1) Loosen the stopper tightening screw① as in the
figure and turn the thread take-up spring stopper②
counterclockwise. Then the operating scope of the
thread take-up lever spring③ becomes narrower.
Otherwise, the operating scope becomes wider.
※ The standard operating scope of the thread take-

up lever is 5~10mm.

2) Adjusting Tension of Thread Take-up Spring A
Loosen the thread tension adjusting device shaft nut① and fixation screw⑤, turn the groove of thread tension
adjusting device shaft② with driver in a clockwise direction to decrease the tension of thread take-up spring③
and turn it counter-clockwise to increase the tension.

3) Adjusting Tension of Thread Take-up Spring B
Loosen the fixation screw⑥ and turn the adjusting collar⑦ in a clockwise direction to decrease the tension of
spring④ and turn it counter-clockwise to increase the tension.

[Fig. 8-1]

•For machine maintenance and repair, consult with qualified technicians.

•For electrical maintenance and repair, consult with qualified technicians or agencies.

•When safety devices are disassembled, make sure to return them to original positions.

•Use both hands when bending the machine backwards or returning it to the original position. Using

only one hand can lead to severe hand injuries due to the weight of the machine.

•Turn off the switch and pull the plug. Pressing pedal by mistake may result in physical injuries.

- Inspection, maintenance, repair

- Exchanging expendable parts such as needle, hook, knife.

- Adjusting hook oil flow

•In case you operate the machine when the power is on, please take special precaution.

Caution

①

③

②

①

②

③

[Fig. 8-2]

⑤

④

⑥

⑦

38

8.2) Adjustment of Thread Guide on
Thread Adjusting Device

When the two tightening screws ② are at the center of the
thread guide ① on the thread adjusting device, this is a
standard position.

1) Loosen the tightening screw ② and move the thread
guide ① on the thread adjusting device left or right.

2)

During stitching thin materials, move the thread tension
adjusting device thread guide① to the left side. (The
amount of thread at the thread take-up lever increases.)

3) During stitching heavy materials, move the thread
tension adjusting device thread guide① to the right
side. (The amount of thread at the thread take-up lever
decreases.)

8.3) Adjustment of Feed Dog Position.

8.3.1) Feed Dog Position When Stitch Length is 0

When stitch length is 0, the feed dog's feed is 0. In
this case, if the feed dog's feed is not 0, please
perform the follow setting.

1) Open the bed cover.

2) Loosen the horizontal crank fixing screw① and

turn the upper shaft pulley. Check if the switch
connection rod② moves, when the upper shaft
pulley is turned.

3) When the switch connection rod② moves, loosen

the switch connection crank fixing screw③ and
adjust the angle of the switch by using the angle
adjusting hole of the switch④.

4) When the upper shaft pulley is turned and the

switch connection rod does not move, completely
fix all fixing screws.

8.3.2) Feed Dog Position on Needle Plate

When the stitch length is maximum, the feed dog
position② in the needle plate hole① should be
identical from the front (A) and back (B) on the
needle plate. The minimum figure is 0.7mm. If they
are not identical, please perform the follow setting.

1) Loosen the fixing screw③ for the feed dog

supporting crank④.

2) Adjust the feed dog base④ to set the distances of

(A) and (B). Completely fix the fixing screw④
for the feed dog supporting crank.

①

②

③

Ⓐ

Ⓑ

④

0.7mm

[Fig. 8-3]

[Fig. 8-5]

1) In the case of wrong feed adjustment, stitch length could be different when moving forward and
backward.

2) Feed regulator should be fixed with feed regulator guide screw⑤ not to move it in a direction of
arrow (X) because tight fixation can interfere with feed regulator’s operation.

Caution

①

②

④

[Fig. 8-4]

①

②

39

8.4) Height adjustment of feed dog

Set the stitch count at the minimum and place the feed
dog① at the maximum height. The normal condition is
that the feed dog① is located 1mm above the needle
plate②. If it is not in the normal condition, take actions
as below to adjust the feed dog height.

1) Turn the upper shaft pulley of the sewing machine to
place the feed dog at the highest position.

2) Lean the sewing machine backward.

3) Slightly loosen the fixing screw for the feed lift shaft
crank③.

4) Turn the feed lift shaft crank④ to adjust the feed dog
height to be 1mm.

5) When adjustment is completed, tightly fasten the
fixing screw③.

8.5) Adjustment of feed lift shaft cam and
lower feed cam

1) After setting up the stitches at the minimum, put the
needle bar at the lowest position.

2) Adjust the direction of the second screw② on the
feed lifting cam① to the vertical upward and tighten
it firmly.

3) Lift the needle bar to the highest point.

4) Adjust the direction of the first screw④ on the lower
feed cam⑤ to the vertical upward and tighten it
firmly.

5) When the adjustment is made as above, the tips of
the needle③ and the feed dog⑥ contact the face of
the needle plate⑦.
Otherwise, make adjustment as above following the
above methods.

6) After setting up, tighten all the screws firmly.

[Fig. 8-6]

[Fig. 8-7]

When the feed lift shaft crank ④ is turned, make sure that it does not move toward the shaft.

Caution

①

②

①

③

④

1mm

②

⑦

③

④
⑤

①

⑥

40

8.6) Needle and Hook Timing

Set up the stitches at the minimum and put the needle①
2mm above the lowest position, then the blade of hook
② is in the middle of the needle(or 2/3 position
downward). The appropriate distance between the
needle groove and the hook edge② is 0.1mm. At this
time, the hook edge② should not contact the needle ①.
If the above conditions are not met, perform the
following adjustments.

8.6.1) Adjustment of Needle and Hook Timing

1) Disassemble the needle plate.

2) Lean the machine backward. Loosen the lower
shaft collar fixing screw ① and set the needle
position 2mm above the lowest position.

3) Turn the hook shaft to place the hook edge at the
center of the needle and tightly fasten the fixing
screw ① for the lower shaft collar.

8.6.2) Clearance adjustment between needle
and hook

1) Loosen two hook base screws④ and lower shaft

collar screw and adjust the space between the needle
① and the hook blade③ to 0.1mm by adjusting the
position of the hook base.

2) Adjust the position and tighten firmly each fixed
screw.

8.6.3) Adjustment of Hook Needle Guide
Position

The normal condition is that the distance between the
needle① and the needle guide② of the hook is 0.1
when the needle bar is lifted 2mm from the lowest
point. (When the Needle Guide fixing screw ⑥ is
turned clockwise, the needle ① gets away from the
needle guide②. Otherwise, the needle gets closer to
the needle guide).

2mm

①

0.1mm

①

②

[Fig. 8-8]

[Fig. 8-9]

[Fig. 8-10]

When needles are replaced. Check the distance between the needle and the hook.

Caution

①

③

④

⑥

0.1mm

②

41

8.7) Clearance adjustment of hook and
opener

Bring the opener① to the hook② as close as possible
and loosen the fixing screw③ of the opener. Adjust the
open space between hook stopper④ and the groove⑤ of
the needle plate to 1.2~1.3mm then tighten the opener
screw③ firmly.

8.9) Adjustment of Presser Foot Height

1) The lifting of the presser foot is 12mm(manually) and
20mm(automatically). This is the standard. How to
adjust is below.

2) Adhere the pin⑥ inserted into the press bar lifting
shaft⑤ to the presser bar lifting bracket⑦. After
facing presser foot lifting lever① and the presser
foot lifting block② closely, tighten the screw③
firmly.

8.8) Lubrication adjustment of hook

8.8.1) Checking the oil supply level of hook

After racing the sewing machine for three minutes,
secure the oil flow checking paper on the right side
of the hook and run the machine at a maximum
speed for ten seconds. (You may use any type of
paper) As shown in the figure, check the oil tape
marked on the paper.

8.8.2) Adjustment of the oil supply level

Make the adjustment when the quantity of oil supply
is not adequate.
a) Take off the sliding plate (left).
b) Turn the machine manually until you see the

adjusting screw① for the oil supply level of the
hook.

c) The amount of the oil supply will decrease when

the adjusting screw① is turned in a clockwise
direction, and increase when turned in a
counterclockwise direction. Check the level of
the oil supply after adjustment.

①

[Fig. 8-11]

[Fig. 8-12]

Please be noted that the presser bar lifting spring could be separated when the presser foot pressure
adjusting dial⑧is fully released.

Caution

[Fig. 8-13]

⑤

1.2~1.3 3.5 0.2~0.3

①

③

②

④

⑧

③

3

①

②

21

⑦

⑥

⑤

42

8.10) Timing adjustment of the main·
auxiliary presser foot and needle

8.10.1) Adjustment of maximum ascending
amount of the main·auxiliary presser
foot

The maximum overlapping portion of main and sub
presser foot is 8mm. First of all, set the upper cap
dial to “1” and get rid of the upper cap then move the
climb device body① until it gets to the stopper plate
② in the direction of the arrow.

Lift the cylinder knuckle⑤ of the climb shaft 1mm

then tighten the screw③.
When the regulation ends reassembles the upper cap
lid.

8.10.2) Adjustment of lifting amount of the
main·auxiliary presser foot

The height of lifting amount of the main·auxiliary
presser foot must be equal. Make the adjustment as
indicated below.

1) Set the presser foot overlap at the maximum.

2) Take out the rubber cap from the upper lid.

3) Loosen the clamp screw① and turn the machine
until the needle tip and the upper part of the feed
dog come to meet on the surface of the needle
plate.

4) As in 󱂀 above, make the main and subordinate
presser feet contact the needle plate at the same
time and after that, tightly fasten the tightening
screw① to finish the adjustment.

5) After adjustment, place back the rubber cap on
the upper lid.

8.10.3) Timing adjustment of the main·
auxiliary presser foot and needle

As a standard, the needle tip enters the needle hole of
the feed dog immediately after the main presser foot
① touches the feed dog. Likewise, the main presser
foot① comes apart from the feed dog right after the
needle tip comes out of the feed dog. Refer to the
following for adjustments.

1) Disassemble the upper lid with the dial set at “1”.

2) Loosen two fixing screws of vertical movement
cam② of the presser foot.

3) Fit the Num. 1 screw③ of the cam② to the
carving hole of the upper shaft and tighten two
cam fixation screws firmly.

4) Place back the upper lid after adjustment.

①

②

③

[Fig. 8-14]

[Fig. 8-15]

[Fig. 8-16]

④

①

③

③

⑤

①

②

8mm

43

8.11) Trimmer

8.11.1) Trimming Order

When the pedal is stepped backward during sewing, trimming is conducted. The following is the trimming order.

1) When a trimming signal is entered, as in Figure (A), the trimming roller lever ① is located at the lowest part
of the curved line of the trimmer cam. In this case, the moving blade ④ is parted from the fixed blade ③ as in
Figure (B) and conducts a rotary movement toward the opener after passing above the bobbin.

2) As in Figure (C), the trimmer cam conducts the rotary movement and the trimmer roller lever ① contacts the
cam. At this moment, the moving blade ④ holds the lower and upper threads as in Figure (D), and performs
rotary movement toward the fixed blade ③.

3) When the trimmer roller lever ① and the trimmer cam②'s hole ⑤ are in a line as in Figure (E), the moving
blade ④ trims the thread by contacting with the fixed blade ③ as in Figure (F).

[Fig. 8-17]

Trimmer Type-A Trimmer Type-B

②

①

①

①

②

②

⑤

③

③

③

④

④

④

<A> <B>

<C>

<E> <F>

<E> <F>

<D>

<C> <D>

<A> <B>

①

④

①
②

②

③
④

①

②
③

④

⑤

44

8.11.3) Fixing Screw and Lower Thread Holder

When the fixed blade ① is half entered into the
moving blade, trimming is conducted safely at the
lowest possible pressure. At the time of trimming,
the lower thread holder③ contacts the moving blade
② stably holding the lower thread. Adjustment can
be conducted as follows.

1) Loosen the tightening screw④, and place the
hook base⑦ and the fixing blade base⑧ closely.
Fasten the tightening screw④ at the hole center.
Loosen the fixing screw⑨ and adjust the distance
between the slide plate guide⑤ and the fixing
blade tip① at some 24mm. After that, tightly
fasten the fixing screw⑨.

2) In case of the lower thread holder③, loosen the
lower thread holder screw⑥ and adhere the lower
thread to the inside⑩ of the blade② with small
pressure not to hold lower thread too strong or
too weak, then tighten the screw⑥ firmly.

[Fig. 8-19]

⑤

①

⑨

24mm

③

⑥

④

②

⑧

⑦

8.11.2) Adjustment of Moving Blade

The moving blade① moves the upper and lower
threads to the point of the fixed blade⑥. At this
time, the moving blade① rotates while it does not
touch the bobbin case, and trimming occurs through
its contact with the fixed blade. Blades can be
adjusted as follows:

1) Loosen the moving blade fixing screw② to the
extent that the moving blade① has the space to
move around.

2) Place the moving blade at the center of the fixed
blade⑥ and the contact area with the moving
blade⑦, and then tightly fasten the fixing screw
②.

3) Loosen the collar fixation screw④, ⑧ and
loosen the screw of the thread trimming lever①
in the [Figure 8-17].

4) Place the hole of the moving blade contact part⑦
at the center of the fixed blade⑥ and fix the
collar with screw⑧ to the upper face, fix the
collar with screw④ to the lower face then tighten
screws firmly. As shown in the figure<E> of the
[Figure 8-17], tighten the screw of the thread
trimming lever①.

[Fig. 8-18]

②

①

⑥

②

④

⑤

⑧

③

⑦

⑩

45

8.12) Safety Clutch

The safety device for the lower shaft timing pulley ② is
to prevent hook damage caused by thread winding
around the hook or the setting disruption.

1) Slightly loosen two piston stopper screw nuts③.

2) When the two piston stopper screws① are turned
clockwise, it increases torque, and vice versa. After
torque adjustment, tightly fasten the nut③.

8.11.4) Adjustment of Trimmer Cam and Lever

The location of the trimmer cam① is determined by
the movement of the moving blade②. Upon
trimming, the trimming lever roller③ contacts the
lowest curved line of the trimmer cam. However,
during sewing, the trimmer lever roller③ and the
trimmer cam① do not contact each other. To make it
sure, adjustment can be conducted as follows.

1) Loosen three trimmer cam fixing screws④ and

the trimmer lever tightening screw⑨.

2) At the top of the thread take-up lever, adjust the

cam to make the opener shaft center⑤, the
setting hole⑥ of the thread trimming cam and the
thread trimming lever roller center③ located on
the same line as shown in the figure A.
(At this moment, the position of moving blade②
is on the thread trimming complete position as
shown in the figure <F> of the [Figure 8-17].)

3) Tightly fasten three fixing screws④ and the

trimmer lever tightening screw⑨.

4) Loosen the trimmer clamp fixing screw⑦

5) Adjust the trimmer cylinder shaft⑧ to make the

moving blade② contact the fixed blade⑩ for
trimming when the trimmer cylinder stroke is
maximum.

6) Tightly fasten the fixing screw⑦.

[Fig. 8-20]

③

A

0.1mm

④

⑤

⑨

①

⑦

⑧

②

⑩

⑥

[Fig. 8-21]

⑤

②

③

④

⑥

⑦

①

46

99

Causes of troubles and troubleshooting

Direction and height of
needle

Needle

Ascending level of needle
bar

Height of needle

Gap between needle and
hook

Threading method
Needle
Direction and height of

needle
Upper thread tension
Lower thread tension
Working capacity of take-up

lever spring
Direction and height of

needle
Needle
Threading
Ascending level of needle

bar
Height of needle bar

Gap between needle and
hook

Racing-proof spring of
bobbin case

Take-up lever spring

Needle breaks

Thread breaks

Stitch skips

1

2

3

Needle is inserted into wrong
direction.

Needle is bent.
Bad timing of feed dog.
Bad timing of needle and hook.

Bad timing of needle and hook.

Bad timing of needle and hook.

Wrong threading.
Bent needle or broken needle tip.
Needle inserted in the wrong

position.
Too tight upper thread tension.
Too tight lower thread tension.
Loose upper thread.

Needle inserted in the wrong
position.

Bent needle or broken needle tip.
Thread passing at wrong position.
Wrong timing of needle and hook.

Wrong timing of needle and hook.

Wrong timing of needle and hook.

Remaining length of upper thread
is short .

Due to bobbin racing during
trimming, lower thread dropping
from bobbin case becomes too
short to go up.

Unable to lift lower thread due to
weak take-up lever spring.

Reinsert the needle correctly.

Replace the needle.
Adjust the timing of feed dog.
Adjust the timing of needle and

hook.
Adjust the timing of needle and

hook.
Adjust the timing of needle and

hook.
Thread the needle correctly.
Replace the needle.
Insert the needle correctly.

Reduce tension of upper thread.
Reduce tension of lower thread.
Adjust take-up lever spring.

Reinsert the needle in the right
direction.

Replace the needle.
Replace the needle.
Adjust the timing of needle and

hook.
Adjust the timing of needle and

hook.
Adjust the timing of needle and

hook.
Adjust the thread adjusting

device.
Replace the racing protection

spring.

Adjust the working capacity of
take-up lever spring.

No Symptom Checkpoints Root cause Corrective action

47

Tension of fixed blade

Edge of movable and fixed
blades

Direction of needle
Check the crossing of

trimmer cam notch mark
and blade

Check the Up-stop position
of needle

Upper thread
does not sink.

Lower thread
does not sink.

Trimming errors

Upper thread is
pulled out when
sewing
commences.

4

5

7

6

Too tight upper thread tension.
Too loose lower thread tension.
Too weak upper thread tension.
Too strong lower thread tension.
Tension not aligned between

movable and fixed blades.
Abrasion in blade groove of

movable and fixed blades.
Wrong needle insertion.
Insufficient crossing quantity of

movable and fixed blade.

Too strong upper thread tension.
Too thick a needle for thread.
Take-up lever pulls out the upper

thread because the needle up
and down position is too high.

Reduce tension of upper thread.
Increase tension of lower thread.
Increase upper thread tension.
Decrease tension of lower thread.
Adjust tension of movable and

fixed blade.
Replace movable and fixed

blades.
Reinsert the needle correctly.
Adjust the strokes of movable

and fixed blades.

Adjust tension of upper thread.
Check thickness of needle.
Adjust the up-stop position of

needle.

No Symptom Checkpoints Root cause Corrective action