SunStar KM-235A Скачать руководство пользователя страница 24

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Symptom

Checkpoints

Root cause

Corrective action

Wrong needle insertion

Tension not aligned between
movable and fixed blade

Abrasion in blade groove of
movable and fixed blade

Insufficient crossing between the
fixed and movable blades

Too tight upper thread tension

Needle is too thick for the thread

The thread take-up lever pulls out
the thread due to too high needle
up/down position

Check crossing between
trimming cam scales and
blades

Check the needle up-
stop position

Tension of fixed blade

Direction of needle

Edge of movable and
fixed blades

T r i m m i n g
errors

Adjust tension of movable and fixed
blade

Replace movable and fixed blade

Reinsert the needle correctly

Set the stroke of the movable and
the fixed blades

Adjust upper thread tension

Check the needle thickness

Set the needle up-stop position

Upper thread
comes off when
sewing starts

Too tight upper thread tension

Too loose lower thread tension

Too weak upper thread tension

Too strong lower thread tension

Reduce tension of upper thread

Increase tension of lower thread

Increase tension of upper thread

Decrease tension of lower thread

Upper thread
does not sink

Stitch skips

Lower thread
does not sink

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

Racing-proof spring
of bobbin case

Remaining length of upper thread
is short

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

Take-up lever spring

Change the racing protection
spring

Adjust the working capacity of take-
up lever spring

Adjust the thread adjusting device

Содержание KM-235A

Страница 1: ...USE 2 KEEP THIS MANUAL IN SAFE PLACE FOR REFERENCE WHEN THE MACHINE BREAKS DOWN M MM ME E 0 09 90 09 92 29 9 USER S MANUAL R S Su un nS St ta ar r C CO O L LT TD D KM 235A B High speed single needle lockstitch sewing machine with automatic trimming devices With FORTUNA AC SERVO MOTOR ...

Страница 2: ...e 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...

Страница 3: ...ting a needle 14 2 Adjusting a needle bar 14 3 Timing adjustment of the needle and hook 14 4 Adjusting the oil supply of thread take up unit 15 5 Adjusting the oil supply of the hook 15 6 Placing lower thread and adjusting tension 15 7 Routing upper thread 16 8 Adjusting upper thread 16 9 Adjusting presser foot height and pressure 17 10 Adjusting stitch length 18 11 Adjusting feed dog height and i...

Страница 4: ...ere shall 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 mark means a must not This mark means a must for safety This mark means...

Страница 5: ...al damages such as functional difficulties or breakdowns may occur depending on installation conditions of the machines Be sure to heed the following conditions ⓐ Remove the packing from top to bottom Watch out for nails on the wooden box ⓑ Install a climate controller and clean it regularly to prevent dust and moisture build up from contaminating and corroding the machines ⓒ Keep the machines awa...

Страница 6: ...checking after sewing work is finished ⓗ Never turn the power switch on with the pedal down ⓘ Do not use the machine if the cooling fan is clogged Clean the air filter embedded in the control box at least once a week ⓙ Keep the machine away from strong electromagnetic fields such as high frequency welding machines 1 4 Machine operation Caution Caution ⓐ Safety label Safety instructions for machine...

Страница 7: ...re 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 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 마 십시오 실 보빈 바늘교환시나 청소전에는 반드시 주전원의 스위치를 꺼 주십시오 CAUTION...

Страница 8: ...duction counter Material edge sensor SCOUN 1 SEDG 1A SEDG 2A A counting device which indicates the completed quantity on the program unit panel including added subtracted corrected or remaining quantity along with other performance rates A device 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 ...

Страница 9: ...injuries due to the weight of the machine 1 Installation of the machine head Insert the head hinge into the bed hole and press it well with the rubber hinge Place it in an upright position on the rubber cushion at the corner as shown in the figure Refer to Figure 1 2 Installation of the knee lifting solenoid and the power switch box Refer to the assembly position map in the knee lifting solenoid b...

Страница 10: ...machine has been left unused for a long time 3 Lubrication A Installing a magnet for removing metal chips Place the chip removing magnet from the accessory box onto the oil pump inside the bed Refer to Figure 3 Do not use the magnet for other purposes Operating the machine without the magnet can cause malfunctions Use the magnet to ensure durability of the machine B Feeding oil to the oil pan a Fe...

Страница 11: ...ted by the weight of the motor At this point fasten the fixing nut and fixing nut consecutively Refer to Figure 5 Figure 5 5 Installation of the program unit A Fix the attachment plate on the program unit with three fixing nuts B Mount the unit firmly onto the machine head with two fixing bolts Refer to Figure 6 Figure 6 ...

Страница 12: ...pped in the air That adjustment can be made by loosening the pulley s clamp screw Á on the side with N U carved signs and moving it sideways Adjust the down stop position of the needle such that the needle is on the point of moving up when the needle bar is at the lowest point This adjustment can be made by loosening the pulley s clamp screw Ë on the side with N D carved signs and moving it sidewa...

Страница 13: ...ar by touching the button ⓐ while the machine is in the stop mode When the needle bar is in its down stop position touch the button once lightly to change to up stop position When the needle bar is in its up stop position press the button twice within a second to change to down stop position The button ⓐ can perform both reverse sewing and changing needle up down Refer to Figure 14 9 Functions of ...

Страница 14: ...rubber cap of the needle bar adjusting hole in the faceplate Turn the pulley to bring the needle bar to its lowest point and loosen the screw of the needle bar holder Adjust the needle bar to bring the lower side of the needle bar rear bushing to align at a carved mark where the lowest point of the needle bar comes to Then fix firmly with the screw and cover with the rubber cap 2 Adjusting a needl...

Страница 15: ... pin aligns with the center hole of the thread take up lever crank shaft When you adjust the dot closer to a carved dot in the link cam the level of oil supply will decrease Also no oil will come out when you adjust the carved dot to move pass the carved dot The left right adjustment range of the lubrication adjusting pin is 90 Figure 15 Figure 17 6 Placing lower thread and adjusting tension Cauti...

Страница 16: ...e power switch off Be sure to work with the sewing machine after the motor comes to a complete stop 7 Routing upper thread With the thread take up lever at its highest position route upper thread in sequence as shown in Figure 18 The appropriate length of upper thread dropping from the needle hole during initial sewing is 50mm Refer to Figure 18 Figure 18 8 Adjusting upper thread A Main thread adj...

Страница 17: ...h of the thread adjusting device opens 0 5 1mm Make sure that the thread guide dishes coincide with each other after operation The stroke of thread release lever is 5mm Adjust so that when the cable wire is pulled 0 2mm the thread guide dish does not open and opens only when the cable wire is pulled 2 5mm Refer to Figure 21 Figure 21 More Less Opening amount 0 5 1mm Figure 22 Weak Strong Needle pl...

Страница 18: ...cians or agent A To adjust the height of the feed dog unfasten the screw of the holder crank unit and move the holder crank unit To adjust the height set the stitch length at a maximum and lift the feed dog to the highest position At this point the standard height from the faceplate of the needle plate and the end of the feed dog should be 0 8mm for light sewing materials 1mm for medium heavy and ...

Страница 19: ...e of sewing materials however the center of no 2 screw and that of no 1 screw could be slightly off from a straight line Figure 26 Figure 27 13 Timing adjustment of trimming devices A Turn the pulley by hand to bring the needle bar accurately to its lowest point Bring the carved dot of the lower shaft middle bushing in the bed with the location dot of the trimming cam Tighten with two fixing screw...

Страница 20: ...y forward press the solenoid shaft With the shaft pressed in turn the pulley to bring the trimming drive gear B against the trimming cam gear When two points on the trimming cam come to align with the carved point of the lower shaft middle bushing as shown in Figure stop the rotation of the pulley immediately The trimming lever screw should be unfastened as shown in Figure 31 b At this point press...

Страница 21: ... difficulties After adjustments be sure to use the wrench box from the accessory box to fasten the tension nut Figure 34 15 Replacing the movable blade Turn the pulley manually to bring the needle up to its highest position Take out the needle plate first and unfasten two fixed blade screws to remove the movable blade as shown in Figure 34 When assembling the replacement parts follow this instruct...

Страница 22: ... with the middle of the projecting part of the bobbin See if the bobbin catcher returns smoothly after trimming Figure 39 Presser bar Presser foot Wiper 2mm Figure 40 Wiper holder 1mm 13 5mm 18 Adjusting the wiper As shown in Figure 39 loosen the wiper holder screw to bring ⓐ in parallel with the left surface of the presser foot Assemble so that the lower side of the presser bar bushing is 13 5mm ...

Страница 23: ...d hook Wrong timing of needle and hook Loose upper thread Bad timing of needle and hook Direction and height of needle Operating capacity of take up lever spring Direction and height of needle Ascending level of needle bar Gap between needle and hook Ascending level of needle bar Gap between needle and hook Direction and height of needle Change the needle Adjust the timing of feed dog Adjust the t...

Страница 24: ... the stroke of the movable and the fixed blades Adjust upper thread tension Check the needle thickness Set the needle up stop position 7 Upper thread comes off when sewing starts Too tight upper thread tension Too loose lower thread tension Too weak upper thread tension Too strong lower thread tension Reduce tension of upper thread Increase tension of lower thread Increase tension of upper thread ...

Страница 25: ...25 5 TABLE DRAWING ...

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