SunStar KM-1070 SERIES User manual

USER S MANUAL
KM-1070 SERIES
1-Needle, Unison Feed
Lock Stitch M/C
KM-1072 SERIES
2-Needle, Unison Feed
Lock Stitch M/C
R

Best Quality
Best Price
Best Service
SunStar CO., LTD.
R
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 --------------------------------------------------------------------------------------------- 11
4.1) Installation place --------------------------------------------------------------------------------- 11
4.2) Machine delivery --------------------------------------------------------------------------------- 11
4.3) Bending the machine backwards ----------------------------------------------------------- 11
4.4) Table drawing ------------------------------------------------------------------------------------ 12
4.5) Installation of Sewing Machine Body ------------------------------------------------------- 13
4.6) Supplying oil -------------------------------------------------------------------------------------- 18
4.7) Trial run (Pedal operation) -------------------------------------------------------------------- 19
4.8) Machine Stop Position Check ---------------------------------------------------------------- 19
4.9) Back tack button (thread trimming type) -------------------------------------------------- 20
4.10) Functional description of function switches --------------------------------------------- 20
4.11) Adjusting Parameter of Sub Thread Adjusting Device ------------------------------- 21
4.12) How to Use Dual Tension ------------------------------------------------------------------- 21
5. Preparations for sewing ------------------------------------------------------------------------ 23
5.1) Installing needle --------------------------------------------------------------------------------- 23
5.2) Bobbin Insertion and Removal --------------------------------------------------------------- 23
5.3) Winding lower thread --------------------------------------------------------------------------- 24
5.4) Inserting upper thread -------------------------------------------------------------------------- 24
6. Sewing -------------------------------------------------------------------------------------------------- 25
6.1) Sewing --------------------------------------------------------------------------------------------- 25
6.2) Adjusting thread tension ----------------------------------------------------------------------- 25
6.3) Adjusting upper thread length after trimming -------------------------------------------- 27
6.4) Adjustment of the stitch length --------------------------------------------------------------- 28
6.5) Adjustment of Presser Foot Lift -------------------------------------------------------------- 28

5
6.6) Adjustment of Presser Foot Pressure ------------------------------------------------------ 29
7. Inspecting and checking ---------------------------------------------------------------------- 30
7.1) Daily Cleaning ------------------------------------------------------------------------------------ 30
8. Maintenance and repair ------------------------------------------------------------------------- 32
8.1) Adjustment of Thread Take-up Lever Spring -------------------------------------------- 32
8.2) Adjustment of Thread Guide on Thread Adjusting Device --------------------------- 33
8.3) Adjustment of Feed Dog Position ----------------------------------------------------------- 33
8.4) Height adjustment of feed dog --------------------------------------------------------------- 34
8.5) Adjustment of feed lift shaft cam and lower feed cam -------------------------------- 34
8.6) Needle and Hook Timing ---------------------------------------------------------------------- 35
8.7) Clearance adjustment of hook and opener ----------------------------------------------- 36
8.8) Lubrication adjustment of hook -------------------------------------------------------------- 36
8.9) Adjustment of Presser Foot Height --------------------------------------------------------- 36
8.10) Timing adjustment of the main auxiliary presser foot and needle -------------- 37
8.11) Trimmer ------------------------------------------------------------------------------------------ 38
8.12) Safety Clutch ------------------------------------------------------------------------------------ 40
9. Causes of troubles and troubleshooting ----------------------------------------------- 41

6
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-1070/KM-1072 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

9
Names of main parts
①Presser Foot ②Reverse Button
③Function Switches ④Oil Window
⑤Climb Dial ⑥Thread Winder
⑦Thread Stand ⑧Pulley
⑨Stitch Length Dial ⑩OP Unit and Panel
⑪LED Lamp SMPS ⑫Control Box
⑬Oil Fan ⑭Lap Switch
⑮LED Lamp
Safety Devices
⒃Thread Take-up Lever Cover ⒔Finger Guard
Belt Cover
[Fig. 2-1]

Usage
Lubrication method
Max. sewing speed [spm]
Needle in use
Gauge [mm]
Max. stitch length [mm]
Needle bar stroke [mm]
Thread take-up lever stroke [mm]
Manual [mm]
Automatic [mm]
Hook
Sewing space [mm]
Bed size [mm]
Main motor
Manual backtack lever
Automatic backtack device
Automatic trimmer
Automatic presser foot lift device
10
Specifications
Machine Type
Code Medium and heavy materials
Super heavy materials
None
H
Sewing materials
KM-1070BLX KM-1070BLX-7 KM-1072BLX
KM-1072BLX-7 KM-1070BLXH(-7)
KM-1072BLXH
Model name
Specifications
For medium/heavy materials For super heavy materials
3.2~12 - 6~12 -
Automatic lubrication type
12
34
82.8
10
16
Horizontal large hook (2.5x)
335
603 ×178
Servo motor (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 Basic specifications Basic specifications Basic specifications
3,500(P=1~7mm)
2,000(P=8~12mm)
DP×35 (#12∼#23)
134~35 (Nm80~160) DP×35 (#22∼#25) 134~35 (Nm140~200)
2,800(P=1~7mm)
1,600(P=8~12mm) 2,000(P=1~7mm)
1,600(P=8~12mm)
Presser Foot life
※The speed is varied depending on stitch length. ※Equal to commercial rpm.
Code 1 Needle
2 Needle
0
2
Needle Code Non-trimming
Trimming
None
7
Trimming
KM-1070BLX/KM-1070BLX-7 KM-1072BLX/KM-1072BLX-7 KM-1070BLXH/KM-1072BLXH-7 KM-1072BLXH
Max. sewing speed [SPM]
Presser foot overlap
3,500(3,000)
3,200 3,000
2,900 2,800
2,600
2,400
2,200
2,000
2,800 2,000
2,600 1,900
2,400 1,800
2,20 1,750
2,000 1,700
1,800 1,650
1,600 1,600
2.5 or below
2.5~3.0
3.0~3.5
3.5~4.0
4.0~4.5
4.5~5.0
5.0 or above
KM-1070BLX/KM-1070BLX-7 KM-1072BLX/KM-1072BLX-7
Max. sewing speed [SPM]
KM-1070BLXH/KM-1072BLXH-7 KM-1072BLXH
Stitch length [mm]
Presser foot overlap-based control
2,000 1,600
7.0 or below
8.0 or above

11
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

12
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]

13
4.5) Installation of Sewing Machine Body
4.5.1) Hinge and Bed Supporting Rubber
Fix the hinge rubber ①(2EA) and the bed
supporting rubber ②(4EA) at the grooves on the
table using nails ③.
4.5.2) Presser Foot Lift Cylinder Bracket
Fix the presser foot lift cylinder bracket①under the
table②as in the figure using the M8 hexagonal bolt
③.
4.5.3) Oil Fan
Find the oil fan ①in the accessory box and attach it
aligned with the presser foot lift cylinder bracket ②
using screws.
[Fig. 4-5]
[Fig. 4-6]
[Fig. 4-7]

14
4.5.4) Lap Switch
Attach the lap switch ①beneath the table ②
considering the user’s working position with screws.
4.5.5) OP Panel
Fix the operating panel①to the bracket②using a
bolt③and then fix it to the upper part of the rear arm
using a bolt④.
(Optional：Fix the OP bracket⑤to the table face
using a tapping screw⑥.)
4.5.6) Control Box and LED Lamp SMPS
Attach the control box①and the LED lamp SMPS②
beneath the right side of the table③using screws
and fix them at the places as in the figure.
[Fig. 4-8]
[Fig. 4-9]
[Fig. 4-10]

15
4.5.7) Pedal switch and connecting rod
1) Attach pedal switch to pedal switch bracket
with four bolts .
2) As in the Figure, attach pedal switch bracket
to the lower part of table.
3) Connect one end of the connecting rod with
pedal switch and the other end with pedal, and
then adjust length of the rod.
4.5.9) Adjustment of Belt Tension
Install the motor and sufficiently loosen the fixing
nuts , . Then due to the weight of the motor ,
tension is generated at the belt . Fix the fixing nut
in this position and then tightly fasten the fixing
nut .
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 .
4.5.8) Sewing Machine Body
1) Place the two hinges on the rear bed of the
sewing machine and tightly fasten them using the
screw .
2) Settle the hinge①on the hinge rubber②of the
table③and place the sewing machine body on
the bed base rubber⑥.
3) Insert the machine body sustaining pole into
table 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 wire on the hinge using a
screw .
[Fig. 4-11]
[Fig. 4-12]
[Fig. 4-13]

16
4.5.10) Belt Cover Installation
1) Fix the belt cover on the upper right side of the
arm and the fixing grooves of the belt cover
using screws .
2) Accurately assemble the belt covers , and fix
the belt cover using screws following the same
method. When the assembled belt cover is fixed
to the stud bolt using screws , the belt cover
installation is complete.
4.5.11) Pneumatic Parts Installation and
Function Check
1)
As in the figure, fix the pneumatic unit to the
lower part of the table using the wood screw and fix
the regulator to the table T-leg stiffened plate .
2) Connect the pneumatic tubes according to label
signs and bind the tubes with other lead lines
using the belt clips .
3) Use the regulator to set the default pneumatic
pressure at 0.5Mpa.
4) When applying the seam center guide presser
foot, make sure that the pneumatic pressure of the
regualtor is no highr than 0.3Mpa.
4.5.12) Description of label symbols
Label Sign Cylinder 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 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 needle plate face.
It is used to create sewing lines in parallel along the seam in case of
using two needles.
[Fig. 4-14]
[Fig. 4-15]
However, when the left/right removable thread adjustment device, an optional device is applied, S6
refers to SubL, and S9 refers to SubR.
Note

17
4.5.14) Thread spool stand assembly
Secure the thread spool stand assembly onto the
table using washer and nut on the right side.
[Fig. 4-16]
4.5.13) Pnematic wiring diagram by model
KM-1070BLX
KM-1072BLX
KM-1072BLXH KM-1072BLX-7(Option)
Button switch
cable
KM-1070BLX-7
KM-1070BLXH-7
KM-1070BLXH

18
[Fig. 4-17] [Fig. 4-19]
[Fig. 4-18] [Fig. 4-20]
1) Lubrication to Bed
Loosen the oil tank entrance screw and supply oil until the oil gauge reaches the “HIGH” mark . When oil
supply is completed, tightly fasten the screw . Upon initial installation, run the machine for 30 minutes and
supply oil until the “HIGH” mark.
2) Lubrication to Face Plate
Loosen the two fixing screws for the face plate for disassembly. Supply lubricant through the entrance marked
with an arrow. When oil supply is completed, reassemble the face plate.
3) Lubrication to Hook
Open the sliding plate and supply oil through the entrance marked with an arrow.
4) Oil Window Check
When oil supply to oiled parts is completed, turn on the power. Operate the sewing machine for five minutes at a
low speed and check for any oil flow in the oil hose which runs through the oil window on the front part of the
arm. Operate the sewing machine at the speed of 2,000 spm per minute for the first four to five days of operation,
and use the machine at the normal speed afterwards. Then it is able to keep the machine at the best conditions.
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

19
4.8) Machine Stop Position Check
Press the reverse button 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
The up-stop position of needle bar is where the take-
up lever stops 2mm off of its highest position. For
adjustment, move the magnetic holder built in a
carved N.U. sign of the pulley to the left and right.
4.8.2) Needle Bar Lower Stop Position Check
The lower stop position of the needle bar is the
position where the punched mark of the needle
bar meets the end of the needle bar frame . When
the position is not correct, the position of the
magnetic holders embedded in the N, D punched
marks of the pulley should be moved left or right for
readjustment.
[Fig. 4-22]
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. 4-21]
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

20
4.9)
Back tack button (thread trimming type)
Pressing the back tack button or reverse button 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 button 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 button 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 guide operation switch (Exclusive for KM-1072)
The switch is used in case of using two needles. It creates sewing lines in parallel along the seam of the sewing
fabric.
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.
[Fig. 4-23]
[Fig. 4-24]