Page 1
USER S MANUAL
KM-360J SERIES
R
High Speed 1-Needle,
Needle Feed Bottom
Hemming Sewing
Machine
(Mechanical Part)
Page 2
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.
Page 3
Machine Type
J
General
Attached with near
jean accessories
MODEL KM ‐ 360 J ‐
7
Manual trimming
Automatic trimming
E
M
Mechanical puller &
needle bar oscillating
system
Electronic puller &
needle bar oscillating
system
Page 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. Machine Specifications
---------------------------------------------------------------------------
9
3. Machine Parts
---------------------------------------------------------------------------------------
10
3.1) Parts Name
---------------------------------------------------------------------------------------
10
4. Machine Installation
------------------------------------------------------------------------------
11
4.1) Installation Environment
----------------------------------------------------------------------
11
4.2) Electricity Environment
-------------------------------------------------------------------------
11
4.3) Machine Placement on the Table
-----------------------------------------------------------
12
4.4) Part Assembly
------------------------------------------------------------------------------------
13
5. Preparation Before Use
-------------------------------------------------------------------------
15
5.1) Oil Supply
------------------------------------------------------------------------------------------
15
5.2) Needle Installation
------------------------------------------------------------------------------
15
5.3) Lower Thread Placement
---------------------------------------------------------------------
15
5.4) Bobbin Case Insertion and Disposal
-------------------------------------------------------
16
5.5) Lower Thread Winding
-------------------------------------------------------------------------
16
5.6) Upper Thread Tension Adjustment
---------------------------------------------------------
17
5.7) Remaining Thread Adjustment After Trimming
------------------------------------------
18
5.8) Upper Thread Placement
---------------------------------------------------------------------
18
5.9) Pressured Air Input and Air Pressure Adjustment (KM-360J-7E(M))
--------------
18
6. Maintenance
------------------------------------------------------------------------------------------
20
6.1) Needle Bar Height Adjustment
--------------------------------------------------------------
20
6.2) Needle, Hook Timing Adjustment
-----------------------------------------------------------
20
6.3) Adjustment of Thread Take-up Lever Lubrication
--------------------------------------
20
Page 5
6.4) Hook Lubrication Adjustment
-----------------------------------------------------------------
21
6.5) Puller (upper) Pressure Adjustment
--------------------------------------------------------
21
6.6) Presser Foot Pressure Adjustment
---------------------------------------------------------
21
6.7) Presser Foot Height Adjustment
------------------------------------------------------------
22
6.8) Stitch Length Adjustment
----------------------------------------------------------------------
22
6.9) Pneumatic Wiper Adjustment
----------------------------------------------------------------
23
6.10) Trimmer Cam Adjustment
-------------------------------------------------------------------
23
6.11) Blade Position Adjustment
------------------------------------------------------------------
23
6.12) Thread Take-up Lever Adjustment
--------------------------------------------------------
24
7. Causes of troubles and troubleshooting
-----------------------------------------------
25
8. Table Drawings
-------------------------------------------------------------------------------------
27
8.1) KM-360J-7M (Type A)
-------------------------------------------------------------------------
27
8.2) KM-360J-7M (Type B)
-------------------------------------------------------------------------
28
8.3) KM-360J-7M (Type C)
-------------------------------------------------------------------------
29
9. Pneumatic Circuit Diagram
-------------------------------------------------------------------
30
9.1) KM-360J-7M(E)
----------------------------------------------------------------------------------
30
Page 6
6
Safety instructions on this manual are defined as Danger, Warning and Caution.
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.
ⓕ The machine is not provided with a local lighting due to the feature of machine.
Therefore the illumination of the working area must be fulfilled by end user.
[Refer] Details for machine installation are described in 4. Machine Installation.
When the machine needs to be repaired, only the assigned troubleshooting engineer educated
at the company should take charge.
ⓐ Before cleaning or repairing the machine, turn off the main power and wait 4 minutes till
the machine is completely out of power.
ⓑ Not any of the machine specifications or parts should be changed without consulting the
company. Such changes may make the operation dangerous.
ⓒ Spare parts 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.
11
Machine safety regulations
Page 7
7
KM-360J series were designed as industrial sewing machines to conduct bottom hemming on
fabric and similar materials. 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.
ⓒ Motor cover : A device to prevent hands, feet and clothing from getting jammed by the
motor.
ⓓ 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.
ⓕ, ⓖ Gear covers (left), (right) : They prevent fingers from contacting the conversion gear.
ⓒ
ⓐ
ⓑ
ⓕ
ⓖ
ⓓ
ⓔ
Page 8
8
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.
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.
Caution
1)
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
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.
3)
Page 9
9
22
Machine Specifications
Jeans bottom hemming (for heavy materials)
Automatic lubrication
Up to 4,000 spm
2~5mm
34.6mm
70.8mm
DP×5 SERV 7 110
Rotary large hook (2x)
8~35mm
14mm 14mm 14mm (foot pedal)
4mm 4mm 4mm
○○ ×
○○ ×
0.5MPa
Model Name
KM-360J-7E KM-360J-7M KM-360J-M
Auto (Pneumatic)
Manual
Driven by the stepping pulse
motor
Driven by the stepping pulse
motor
500W direct drive
AC servo motor
500W direct drive
AC servo motor
Clutch motor
Mechanical Mechanical
Mechanical Mechanical
2~4.2mm
Presser Foot Lift
Use
Lubrication
Sewing Speed
Stitch Length
Needle Bar Stroke
Thread Take-up Lever Stroke
Needle
Hook
Pants Hem Size
Automatic Trimmer
Wiper Device
Puller Driving System
Needle Bar Oscillating System
Pneumatic Pressure
Main Shaft Motor
Page 10
10
33
Machine Parts
3.1) Parts Name
① Thread winder
② Pneumatic wiper
③ Presser bar lifter
④ Pneumatic auto presser bar lifter
⑤ Presser foot
⑥ Control box
⑦ Lap switch
⑧ Power switch
⑨ Oil window
⑩ Hammer
⑪ Pneumatic auto presser foot lifter
⑫ Sewing machine pulley
⑬ Program unit
⑭ Thread stand
Safety Gears
⑮ Thread Take-up Cover
⒃ Finger Guard
⒔ Motor Cover
⒕ Gear Cover (left)
⒖ Gear Cover (right)
⑭
⑬
⑫
⒔
⑧
⑥
⑦
⑤
⒃
⑪
③
⒕
①
④
⑨
⑮
②
⒖
⑩
Page 11
11
44
Machine Installation
4.1) Installation Environment
A. Do not use the machine if the voltage is below or above 10% of the rated voltage to prevent error-driven accidents.
B. Check the required air pressure for the devices using air pressure such as air cylinder to prevent error-driven accidents.
C. Use the machine in the following environment to ensure safe operation.
→ Operating temperature : 5°~ 40°C
→ Storage temperature : - 10°~ 60°C
D. Humidity : 20~80% (relative humidity)
4.2) Electricity Environment
A. Power Voltage
The power voltage fluctuation should be maintained within 10% of the rated voltage.
The power frequency is recommended to remain within 1% of the rated frequency (50/60Hz).
B. Electromagnetic Wave Noise
Use a different power supply from a strong magnetic field and high-frequency product, and keep the sewing machine
away from them.
C. Use a safe low voltage when auxiliary devices and accessories are attached to the control box.
D. Take caution not to spill water or coffee into the control box or the motor.
E. Do not drop the control box and the motor.
Sewing machine must be installed by properly trained engineers.
Contact the sales agency or electricity engineer for wiring-related inquiry.
Considering that machine weighs 40Kg or above, two people are needed for machine installation.
Caution
Until the installation is complete, do not connect the power plug. If the foot step is mistakenly
stepped, it may operate the machine, causing injury to user.
Connect the earth wire. If the earth wire connection is incomplete, it may cause electric shock or
wrong operation.
Place motor covers on the head of the sewing machine and the motor.
Caution
Page 12
C. Place the sewing machine bed① on the top of the oil fan
② and make adjustment to align them. Then fix them
with a fixing bolt.
D. Assemble the bed hinge support③ and the bed hinge
bracket④ using the bed hinge shaft⑤, and fix them with
the bed hinge shaft tightening screw⑥.
E. Use the fixing bolt to fix the bed hinge support③ to the
bed. (Adjust the height using the bed hinge support
assembly part.)
F. Completely fasten the fixing bolt for the bed hinge
bracket⑦ and tightly fasten the bed hinge bracket④ to
the table.
12
4.3) Machine Placement on the Table
A. Fix the control box ① to the table.
B. Put the oil fan ① on the marked place and fix the bed
hinge bracket② to the holes.
①
①
①
②
⑥
⑦
⑤
③
④
②
②
[Fig. 1]
[Fig. 2]
[Fig. 3]
Loosely fasten the bed hinge bracket fixing bolts and tightly fasten them after the bed hinge shaft is
assembled.
Caution
To prevent safety accidents, the sewing machine must be delivered by at least two people.
Danger
Page 13
13
E. Install the motor and fully loosen the fixing nuts ①, ②.
Then, tension is generated around the belt ④ due to the
weight of the motor ③. Fasten the fixing nut ① first and
tightly fasten the fixing nut ② (KM-360-M).
②
①
②
③
②
①
①
④
③
4.4) Part Assembly
A. Attach the motor cover ① to the rear side of the machine using the fixing screw ② (However, in case of manual
trimming type, attach the belt cover (A)①, (B)② to the rear side of the machine using the fixing screw③).
B. Assemble the operating panel ① to the bracket ②, and
attach them to the rear side of the machine (KM-360J-
7M).
②
①
KM-360J-7E
KM-360J-7M
KM-360J-M
[Fig. 4]
[Fig. 5] [Fig. 6]
[Fig. 7]
Page 14
14
C. Install the thread stand ② on the table ①.
D. Hammer the head supporting stick ③ into the table.
②
①
E. Install the lap switch ① beneath the table, and fix it with
a nail ② (KM-360J-7E(M)).
②
①
F. Fix the manifolder bracket ① beneath the table and fix it
using a screw ② (KM-360J-7E(M)).
②
①
③
[Fig. 8]
[Fig. 9]
[Fig. 10]
Make sure the head supporting stick completely inserted into the table.
Otherwise, when the sewing machine head is pushed backward, it is not stable and dangerous.
Caution
Page 15
15
55
Preparation Before Use
5.1) Oil Supply
A. Remove the rubber cap ① on the arm face and supply
oil through a funnel ②.
B. Oil should be supplied until the scale is located between
the upper and lower limit of the oil gauge ③.
③
①
5.2) Needle Installation
A. Turn the sewing pulley and place the needle bar ① at the
highest position.
B. Loosen the fixing screw.
C. Make the long groove of the needle ② headed toward
the left, and fully insert the needle into the hole as in the
figure. And fix the needle with a fixing screw.
5.3) Lower Thread Placement
A. Insert the bobbin into the bobbin case as in the figure.
B. Pass the lower thread through the slot ① of the bobbin
case and the lower part of the tension spring ②.
③
User’s
work
direction
Needle
direction
①
①
②
②
[Fig. 11]
[Fig. 12]
[Fig. 13]
The power switch must be turned off for needle installation.
If the pedal is accidentally pressed, it may operate the sewing machine, causing injury to user.
Caution
Looking from the back of the bobbin case, the bobbin inserted should be spun counter-clockwise.
Caution
Page 16
16
5.4) Bobbin Case Insertion and Removal
Open the hook cover and push the bobbin into the hook with
the bobbin case handle held until the click sound is heard.
②
①
5.5) Lower Thread Winding
A. Turn on the power switch.
B. Insert the bobbin ① into the thread winder shaft ②.
C. Wind the thread around the bobbin ① several times in
the arrow direction.
D. Push the thread winder lever ③ into the bobbin
direction.
E. Lift the presser bar with the presser bar lifter.
F. When the pedal is stepped, the sewing machine starts
operating, and the thread is wound around the bobbin.
G. When thread winding is complete, the thread winder
lever ③ is automatically returned.
H. Separate the bobbin and cut the thread with the thread
winder blade ④.
※ Loosen the adjusting screw ⑤ and adjust the thread
winder adjusting plate ⑥ to adjust the thread volume
on the bobbin.
①
②
③
④
⑤
⑥
[Fig. 14]
[Fig. 15]
If the bobbin case is not properly placed, thread entanglement or bobbin ejection might result during
machine operation.
Caution
Bobbin thread volume should be up to 80% of the maximum volume.
Caution
Page 17
17
5.6) Upper Thread Tension Adjustment
Sewing Type
Cause Corrective Action
Evenly created good stitch
If the upper thread tension is too weak or the
lower thread tension is too strong
If the upper thread tension is too strong or the
lower thread tension is too weak
Strengthen the upper thread tension or weaken
the lower thread tension.
Weaken the upper thread tension or strengthen
the lower thread tension.
5.6.1) Lower Thread Tension
Adjust the lower thread tension by adjusting the tension
adjusting screw ① to the extent that the bobbin case
slowly drops due to its own weight when the thread tip is
held as in the figure.
①
5.6.2) Upper Thread Tension
A. Adjust the lower thread tension and then the upper
thread tension to produce evenly created good
stitches.
B. Pull down the presser bar.
C. Turn the tension adjusting nut ② of the main thread
adjusting device for adjustment.
②
Stronger
Weaker
[Fig. 16]
[Fig. 17]
Stronger
Weaker
Turn off the power switch when inserting or removing the bobbin case. If the pedal is mistakenly
stepped, it may operate the sewing machine, causing injury to user.
Caution
Page 18
18
5.7) Remaining Thread Adjustment After
Trimming
A. During trimming, the tension of the main thread adjuster
is not involved, while the tension of the auxiliary thread
adjusting device ① plays a role.
B. The standard remaining thread length after trimming is
35~40mm.
C. If the tension of the auxiliary thread adjuster ① is
adjusted stronger, the remaining thread after trimming
gets shorter. If the tension is adjusted weaker, the
remaining thread gets longer.
①
Stronger
5.8) Upper Thread Placement
A. Turn the pulley of the sewing machine to locate the
thread take-up lever ① at the highest position and pass
the thread through the thread take-up lever. This makes
threading easier and prevents thread escape when sewing
starts.
B. Make the remaining thread as long as 35~40mm from
the needle eye.
5.9) Pressured Air Input and Air Pressure
Adjustment (KM-360J-7E(M))
A. Connect the quick joint plug ② attached to the table to
the quick joint socket ① through which pressured air
flows in.
B. Open the finger valve ③ to make the pressured air flow
into the machine.
①
②
③
[Fig. 18]
[Fig. 19]
[Fig. 20]
Weaker
When the finger valve is closed after operation, the remaining air is automatically released, and the
remaining pressure is marked at 0MPa (0Kgf/cm
2
).
Caution
Page 19
19
C. Pull up the adjusting handle at the upper part of the filter
regulator and turn it clockwise as in the figure. This
increases pressure. If it is turned counter-clockwise,
pressure decreases. Adjust the pressure to the
appropriate level of 0.49~0.54MPa (5~5.5Kgf/cm
2
) as
marked on the pressure gauge and then return and settle
the adjusting handle.
[Fig. 21]
Page 20
20
66
Maintenance
6.1) Needle Bar Height Adjustment
When the needle bar ① is at the lowest position, set the
carved line ⓐ of the needle bar ① to meet the bottom of the
oil rejecter cover ②.
A. Turn the pulley and place the needle bar ① at the lowest
position.
B. Remove the rubber cap ③.
C. Slightly loosen the screw ④ and adjust the position of
the needle bar ①.
D. Completely fasten the screw ④.
E. Place back the rubber cap ③.
6.2) Needle, Hook Timing Adjustment
A. Turn the pulley and lift the needle bar from the lowest
position. As in the figure, set the carved line ⓐ in line
with the bottom of the oil rejecter cover ②. Make sure to
set the distance between the needle eye and the tip of the
hook at 0~0.5mm.
B. Loosen the three screws ⑤ and set the tip of the hook ③
in line with the center of the needle ④. Adjust the
distance between the tip of the hook ③ and the needle
④ at 0.05~0.1mm.
C. Tightly fasten the three screws ⑤.
6.3) Adjustment of Thread Take-up Lever
Lubrication
As in the figure, when the mark ② on the lubrication
adjusting pin ① head is in line with the center of the thread
take-up lever crank shaft hole ③, lubrication volume is
maximum. When the pin is turned left or right and the mark
is adjusted toward the edge ⑤ of the link cam washer ④,
lubrication volume gets smaller.
If the edge of the link cam washer is passed, no lubricant is
supplied.
①
①
①
④
③
⑤
④
⑤
③
②
①
②
ⓐ
④
②
③
ⓐ
[Fig. 22]
[Fig. 23]
[Fig. 24]
Page 21
21
6.4) Hook Lubrication Adjustment
A. Lubrication Volume Check
a. Conduct idle operation for some 3 minutes (at an
appropriate speed). Place the lubrication test sheet as
in the figure and operate the machine for 5 seconds
to check lubrication. Check oil volume sprayed to the
sheet.
b. Conduct the lubrication testing three times. If the oil
strip remains within the maximum and minimum
range, the lubrication is deemed proper (If
lubrication is too small, hook operation might not be
smooth, If lubrication is too much, the oil may stain
the fabric.)
B. Lubrication Volume Adjustment
Turn the lubrication volume adjusting screw ① on the
lower shaft front bushing clockwise (+ direction), and
then lubrication volume increases. If it is turned counter-
clockwise (- direction), lubrication volume decreases.
Hook
Lubrication test sheet
Oil strip
Oil strip
Max. limit
Decrease Increase
①
①
①
①
Weaker
Stronger
Stronger
Weaker
Min. limit
6.5) Puller (upper) Pressure Adjustment
If the pressure adjusting screw ① is turned clockwise,
pressure gets stronger, and vice versa.
After adjustment is complete, the fixing nut ② must be
fastened.
6.6) Presser Foot Pressure Adjustment
Turn the pressure adjusting nut ① clockwise to increase the
pressure, and turn it counter-clockwise to decrease the
pressure.
[Fig. 25]
[Fig. 26]
[Fig. 27]
Page 22
22
6.7) Presser Foot Height Adjustment
When the presser bar lifter ② is lifted, the presser foot ① is
normally lifted 4mm. At this time, the distance between the
rollers (up) ⑥ and (down) ⑦ is 5mm.
A. Loosen the nut ③ and unfasten the pressure adjusting
screw ④.
B. Lift the roller (up) ⑥ with the presser bar lifter ②.
C. Remove the rubber cap ⑤ from the face plate.
D. Slightly loosen the tightening screw ⑧ and adjust the
position of the presser bar ⑨ to set the distance between
the roller (up) ⑥ and the roller (down) ⑦ at 5mm.
E. Fasten the tightening screw ⑧.
F. Put back the rubber cap ⑤.
G. Adjust the puller (up) pressure with the pressure
adjusting screw ④ and fasten the nut ③.
H. Loosen the tightening screw and move the presser bar
lifter arm to adjust the presser bar height at 4mm.
④
③
⑧
②
⑤
①
⑥
⑦
⑪
⑩
5mm
4mm
①
③
④
②
①
③
⑤
⑥
6.8) Stitch Length Adjustment
The default stitch length is 2.9mm.
A. Loosen the tightening screw ① and remove the puller
gear cover (right) ②.
B. Set the desired stitch length using the stitch length table
and make a new conversion gear ready.
C. Loosen the tightening screw ③ and remove the present
conversion gear ④.
D. Replace it with a new conversion gear and fasten the
tightening screw ③.
E. After the conversion gear replacement, adjust the needle
feed volume.
F. Press the feed adjustment button ⑤ on the arm face.
G. Turn the pulley ⑥ until the feed adjusting button ⑤ is
inserted into the groove of the stitch length conversion
cam and a click sound is heard.
H. Turn the pulley to make the stitch length marked on the
pulley in line with the punched mark.
I. Release the feed adjusting button ⑤ and check if the
pulley ⑥ is smoothly operating.
※ See the program unit operating method for step motor's stitch length adjustment (KM-360J-7E).
[Fig. 28]
[Fig. 29]
U
26
28
30
32
34
36
38
D
38
36
34
32
30
28
26
STITCH LENGTH
2.0
2.3
2.6
2.9
3.3
3.7
4.2
The stitch length may change depending on fabric type and thickness. Readjust the stitch length after
checking the sewing condition.
Caution
Page 23
23
6.9) Pneumatic Wiper Adjustment
A. Release air pressure.
B. Turn the pulley to place the thread take-up lever at the
highest position.
C. Pull the wiper ① and loosen the nut ②. Adjust the wiper
position as in the figure and fasten the nut ②.
D. Loosen the nut ③ and set the distance between the
needle tip and the wiper at some 1~2mm.
E. Return the wiper ① back to the original place.
6.10) Trimmer Cam Adjustment
A. Turn the pulley and set the thread take-up lever at the
highest position.
B. Press the solenoid lever ③ to make the trimmer cam
roller ① inserted into the trimmer cam ②.
C. Turn the pulley to make the needle bar's carved line meet
the bottom of the oil reject cover ④. Then adjust the
trimmer cam to make the trimmer main lever ⑤ move to
the left.
D. Loose the trimmer cam tightening screw ⑥ for
adjustment. When adjustment is complete, tightly fasten
the screw.
6.11) Blade Position Adjustment
A. Remove the rubber cap ①.
B. Turn the pulley to place the thread take-up lever at the
highest position.
C. Push the trimmer cam roller ② into the trimmer cam ③
and turn the pulley until the moving blade ④ can move
in full.
D. Loosen the trimmer lever screw ⑥ to set the distance
between the moving blade ④ and the roller (down) ⑤ at
0.5mm. When adjustment is complete, fasten the screw.
E. Reassemble the rubber cap ①.
①
③
②
[Fig. 30]
[Fig. 31]
[Fig. 32]
④
⑤
①
⑥
②
③
⑥
①
②
③
④
⑤
Page 24
24
6.12) Thread Take-up Lever Adjustment
A. Loosen the nut ①.
B. Turn the adjusting screw ② to set the distance between
the thread release lever roller ③ and the trimmer cam at
0.5mm.
C. Fasten the nut ①.
①
②
③
[Fig. 33]
Page 25
25
77
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
Page 26
26
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
Page 27
27
88
Table Drawings
8.1) KM-360J-7M (Type A)
Page 28
28
8.2) KM-360J-7M (Type B)
Page 29
29
8.3) KM-360J-7M (Type C)
Page 30
30
99
Pneumatic Circuit Diagram
9.1) KM-360J-7M(E)
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