Sunstar Machinery KM-250BL Series User Manual Download

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Symptom

Checkpoints

Root cause

Corrective action

Trimming miss

Upper thread
falls out when
starting to sew

Replace movable knife or fixed knife

Insert needle in to right place

Respond to the stroke of movable
and fixed knifes

Adjust Tension of the upper thread

Correct the thickness of the needle

Find out needle top stop position

Scratch and abrasion of movable
and fixed knives

Needle is inserted into wrong
direction

Lack of the meeting movable and
fixed knifes

Tension of the upper thread is strong

Needle is too thick for thread

The position of Needle top and lower

Blade side of movable
and fixed knives

Direction of needle

Check trimming cam
and exchange knifes

Check for Needle top
stop position

Summary of Contents for KM-250BL Series

Page 1: ...anual KM 250BL Series High speed one needle sewing machine with automatic thread trimmer 1 For proper use of the machine thoroughly read this manual before use 2 Keep this manual in a safe place for future reference in case the machine breaks down M MM ME E 0 05 50 05 50 09 9 ...

Page 2: ... 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...

Page 3: ...ton function 15 3 Adjustment of the Machine 16 1 Inserting the needle 16 2 Adjusting needle bar 16 3 Adjusting timing of needle and hook 16 4 Adjusting oil flow in thread take up 17 5 Adjusting oil flow of the hook 17 6 Inserting lower thread and adjusting thread tension 18 7 Routing the upper thread 19 8 Adjusting the upper thread 19 9 Adjusting the height and pressure of the presser foot 20 10 A...

Page 4: ...ll be observed strictly Otherwise the user will be killed or suffer severe physical injuries Instructions here must be observed or the user could suffer fatal or severe physical injuries Instructions here should be observed or the user could face physical injuries or mechanical damages Danger The meaning of symbols This symbol means a must not Warning Caution 4 This symbol means that an electric s...

Page 5: ...are likely to occur according to the environment in which the machine is being installed Therefore the following preconditions should be fulfilled ⓐ Please keep the order from top to bottom when unpacking the package Especially mind that the nail on the boxes ⓑ Because machines are apt to be contaminated and corroded by dust and moisture you should install the climate controller and should clean t...

Page 6: ... threading the needle or before checking after sewing be sure to stop the machine ⓗ Don t switch on the power supply with the foot on the pedal ⓘ Don t run the machine when the cooling fan are not running Be sure to clean the air filter in the control box once a week ⓙ If possible keep off from the strong electronic wave like a high frequency welding machine 1 4 Machine Operation Warning Warning ⓐ...

Page 7: ...jury Be sure to wait at least 360 seconds before opening this cover after turn off main switch and unplug a power cord 고압 전류에 의해 감전될 수 있으므로 커버를 열 때는 전원을 내리고 전원 플러그를 뽑고 나서 360초간 기다린 후 여십시오 CAUTION 경 고 Do not operate without finger guard and safety devices Before threading changing bobbin and needle cleaning etc switch off main switch 손가락 보호대와 안전장치 없이 작동하지 마십시오 실 보빈 바늘교환시나 청소전에는 반드시 주전원의 스위치를 꺼 주십시오...

Page 8: ...mm 0 7mm 0 7mm Needle DB 1 20 23 DB 1 20 23 DB 1 20 23 Presser Foot Height Manual 5 5mm Knee 14mm Manual 5 5mm Knee 14mm Manual 5 5mm Knee 14mm 2 Servo motor MODEL SC55 1A SC55 2A SC55 3A VOLT ONE PFAHSE 110V ONE PFAHSE 220V THREE PHASE 220V WATT 550W 550W 550W HERTZ 50 60 Hz 50 60 Hz 50 60 Hz 3 470 motor MODEL PM470 PHASE 1 1 1 1 3 3 3 3 1 1 3 3 HERZ 5 50Hz 6 60Hz 5 50Hz 6 60Hz 5 50Hz 6 60Hz 5 50...

Page 9: ... that senses the edge or thickness of the sewing material to stop the machine without manual pedaling Available in two types SEDG 1 for edge sensing type and SEDG 2 for thickness sensing type An essential device when one person is operating multiple sewing machines Has different pedals for acceleration thread trimming presser foot and ascending pedal Types consist of SPDL 1 EDPL 1 for fixed speed ...

Page 10: ...he machine will start automatically and can cause physical injuries Connect the ground earth wire An unstable connection may result in an electric shock or a malfunction Place the belt cover on top of the machine Use both hands when bending the machine backwards or returning it to the normal position Using only one hand can lead to severe hand injuries the weight of the machine 2 Installation of a...

Page 11: ...in use is down to the LOW mark fill in to HIGH immediately d Once every two weeks is deemed the appropriate interval for oil refills Figure 4 HI G H OIL LOW 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 a...

Page 12: ...htly See Figure 5 Figure 5 5 Installation of the program unit A Installation of Installation of automatic knee lifting solenoid a Fix the bracket on to the program unit using 4 fixing nuts b Use 2 fixing bolts and 3 fixing nuts to fix the bracket tightly Figure 6 B Installation of manual knee lifter a Fix the bracket on to the program unit using 4 fixing nuts b Then use 3 fixing bolts to tightly f...

Page 13: ... table Make sure that the belt properly operates without interference from the belt cover B Figure 9 7 Location detector assembling and its control method A Installation of location detector a Installing on the servo motor in built location detector A sensor of location detector is attached to the back side of the arm The appropriate clearance between the location detector and the pulley is 0 5mm ...

Page 14: ...shing Fixing nuts Pulley L wrench Fixing nuts 2 of synchro shaft Synchro shaft Photo flim Photo interrupt COVER PCB holder 8 Adjustment of location detector A For in built location detector Adjust the up stop position of the needle such that the white carved sign on the pulley is in a straight line with the carved sign on the arm when the needle has stopped in the air That adjustment can be made b...

Page 15: ...s in an up position If not adjustment to the photo film of the location detector or to the location of the magnetic holder will be necessary since there may be problems with the trimming In other words the needle s up stop position should be identical with the stop position of the needle bar after the trimming operation which would signify that there is nothing wrong with the operation timing of t...

Page 16: ...igure 19 Figure 19 Figure 20 HOOK 0 05 0 1mm 0 5mm 2 Adjusting needle bar As can be seen in figure 20 pull out the rubber cover of needle bar adjusting hole and turn the pulley to place the bar at the lowest part Then loosen the needle bar clamp screw and make the carved sign of the lowest bar meet the lower part of needle bar down bushing by moving the bar When is done fix the clamp screw and clo...

Page 17: ...e put the paper at the place as in figure 22 And rotate the machine for a 5 second The amount of oil can be checked by the oil sprayed on the paper b Implement the test three times to find out whether it is short or abundant The appropriate flow is one that does not exceed or lack based on the flow in the picture If oil flow is not enough the hook will not operate properly If oil flow is too much ...

Page 18: ... A Put the bobbin into the bobbin case And insert the thread into the thread groove and then wind it from the back to the front of the tension adjusting plate spring Turning the tension adjustment nut of the hook clockwise makes the lower thread tension stronger and counterclockwise makes it weaker When hold the end of thread make sure that the bobbin case should drop by gravity in order to adjust...

Page 19: ...t of the thread adjusting device clockwise makes the lower thread tension stronger and counterclockwise makes it weaker Adjust the thread tension responding to the situation because adjustment of the thread tension changes according to sewing conditions such as the sewing material used thread and stitch length B Adjusting the tension of the thread take up spring As can be seen in figure 25 insert ...

Page 20: ...if you should slip When adjusting the machine with the switch on be sure to pay extreme caution Only trained engineers must perform troubleshooting or inspection of the machine For electrical repair or inspection consult with qualified technicians or agent 9 Adjusting the height and pressure of the presser foot A As can be seen in figure 28 lift the rubber cover drop the presser foot on the needle...

Page 21: ...he shipment of machine the ascending amount of the presser foot is fixed at 13mm when automatic knee lifter works Figure 29 12 Adjusting the height and slope of feed dog A Adjusting feed dog height Loosen the crank clamp screw and move the crank to adjust the height of feed dog To adjust feed dog height set the dial at the highest number And when feed dog goes to the highest point be aware that th...

Page 22: ...ection as in picture of figure 32 c Check the height of feed dog because the height of it changes after the adjustment of feed dog Figure 32 Feed dog Front is up Adjusted Front is down Front Back 13 Adjusting the trimming device A Adjusting the trimmer driving part The part of trimmer cam is seen in figure 33 Figure 33 Fixed knife Thread cover Trimming solenoid Trimming solenoid base Movable knife...

Page 23: ... trimmer driving part a It is normal to assemble as in figure 35 b Fix the trimming cam final crank to the trimming shaft as in the picture c Attach the stopper lever closely to bed in order to run trimming shaft smoothly enough not to let friction happen Figure 35 Movable knife Fixed knife 91mm Trimming cam final crank Stopper lever D Adjusting trimming solenoid a Trimming solenoid stroke The nor...

Page 24: ... slide arm is 0 5mm as in figure 37 which is normal Figure 37 Solenoid base Clamp screw of solenoid base Clamp screw Trimming solenoid link solenoid arm Trimming crant 0 5mm E Adjusting trimming cam a Manually turn pulley to align with red carved sign and arm carved sign Figure 38 White point The highest point of synchro b With the trimming solenoid running on turn the trimming cam clockwise And f...

Page 25: ...ively Figure 41 5mm 7 5mm b Adjusting the stroke of movable knife With the solenoid running on operate the machine And then movable knife rotate by the trimming cam When stroke of the knife reaches the highest it is normal the blade of movable knife moves 1 5 2mm from the edge of fixed knife Adjust with moving the trimming lever Figure 42 1 1 5mm 14 Adjusting knife tension A As can be seen in figu...

Page 26: ...ews of the knife To assemble follow the reverse order of disassembling Figure 45 16 Exchanging fixed knife A As can be seen in figure 46 loosen hook holder clamp screw and then pull out washer and hook holder When is done disassemble fixed knife clamp screw To assemble follow the reverse order of disassembling Figure 46 B When the thread does not get trimmed or if the trimmed section of the thread...

Page 27: ...ure 49 18 Adjusting feed cam A To adjust the timing of feed dog and needle move the feed cam up and down It is normal that when manual turn of pulley drops feed dog and the upper feed dog adhere to the upper needle plate attach the lower hole of needle to the upper feed dog a To enhance the needle tightening move feed dog slightly slower than needle To that end loosen feed cam clamp screw turn the...

Page 28: ...ed into wrong position 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 loose lower thread tension Loose upper thread Needle is inserted into wrong direction Needle is bent Wrong direction The timing...

Page 29: ...e upper thread Correct the thickness of the needle Find out needle top stop position Scratch and abrasion of movable and fixed knives Needle is inserted into wrong direction Lack of the meeting movable and fixed knifes Tension of the upper thread is strong Needle is too thick for thread The position of Needle top and lower Blade side of movable and fixed knives Direction of needle Check trimming c...

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