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SunStar SC 7900-02 M6 A, User Manual

The SunStar SC 7900-02 M6 A User Manual is now available for free download on our website. This comprehensive manual provides detailed instructions and guidelines for operating the SunStar SC 7900-02 M6 A, ensuring you get the most out of your product. Visit our website today to download your manual and start enjoying the benefits of the SunStar SC 7900-02 M6 A.

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6

11

SAFETY RULES

The following set of safety rules categorized as Danger, Warning and Caution indicates possibilities of physical or property
damages if not fully observed. 

D A N G E R  :  These safety instructions must be observed to be safe from danger when installing, delivering, or

maintaining the machine. 

WARNING : These safety instructions must be observed to be safe from machine injuries. 
CAUTION : These safety instructions must be observed to prevent machine errors. 

1) Machine Delivery 

DANGER

2) Machine  Installation

Warning

3) Machine Repair

Caution

Only qualified technicians who are familiar with the safety instructions should carry the
machine. Make sure to fully observe the following instructions when carrying the machine. 

ⓐ

The machine should be carried out by two or more people.

ⓑ

Clean oil spots to prevent accidents when delivering.

Installation environment may incur machine malfunction or breakdown. Make sure to meet
the following conditions. 

ⓐ

Undo a package from the top in order. Beware nails in wooden box. 

ⓑ

Dust and humidity can cause pollution and corrosion of the machine. Air conditioner
should be equipped and cleaned regularly.

ⓒ

Do not expose the machine directly to the sun. 

ⓓ

Allow at least 50cm of space on each side of the machine for convenient maintenance. 

ⓔ

Explosion hazard

Do not operate machine in explosive atmospheres, where aerosol spray is used in large
quantity or oxygen is controlled.

ⓕ

The lighting is not offered because of the nature of the machine, the lighting should be
install in the workspace by users. 
[Reference] details of the machine installation are illustrated in 4. INSTALLAION.

Only SUNSTAR MACHINERY Co.,Ltd-trained and selected repair engineers should go
repair work. 

ⓐ

Turn off the power before cleaning or repairing the machine. Wait for 4 minutes so the
machine electricity is completely discharged. 

ⓑ

Do not change the specifications or any parts on the machine without confirmation from
SUNSTAR MACHINERY Co.,Ltd. Such change may cause safety accidents. 

ⓒ

Use only SUNSTAR MACHINERY Co.,Ltd parts when repairing machine. 

ⓓ

Put all safety cover on after repairing. 

Summary of Contents for SC 7900-02 M6 A

Page 1: ... r C CO O L LT TD D D Di ir re ec ct t D Dr ri iv ve e 4 4 N Ne ee ed dl le e F Fl la at t S Se ea am me er r F Fe ee ed d o of ff f t th he e A Ar rm m t ty yp pe e 1 Readallinstructionsbeforeusingthe machinetopreventtrouble 2 Keeptheinstructionsandrefertoitduring machinefailures ...

Page 2: ...dustrial sewing machine with refined design improved durability great power perfect performance variable functions based on skills and experience 2 Please read this manual thoroughly before use 3 This manual can be changed the contents without prior notice to improve the functions 4 This is designed and manufactured as an industrial machine Do not use this machine for other than its intended use ...

Page 3: ...eedle Flat Seamer Cutting Type Code One Side Trimming Both Side Trimming 01 02 Application Light Materials Medium Heavy Materials A B SC 7900 02 M6 A Needle Distance Code 5 2mm 6 0mm M5 M6 SC SunStar Chain Stitch Machine Code ...

Page 4: ...IR COMPRESSED TREAD TRIMMING DEVICE Optional INSTALLATION 17 8 AIR COMPRESSED DEVICE INSTALLATION 18 5 LUBRICATION 20 1 OIL 20 2 LUBRICATING OIL 20 3 OIL GAUGE OIL WINDOW 20 4 LUBRICATING OIL EXCHANGE 21 5 OIL PRIMING 21 6 LUBRICATING OIL REPLENISHMENT 21 7 OIL FILTER CLEANING 22 6 STANDARD ADJUSTMENTS 23 1 NEEDLE 23 2 NEEDLE INSTALLATION 23 3 THREADING 24 4 THREAD TENSION MODIFICATION 25 5 PRESSE...

Page 5: ...ND LOOPER TIMING 35 7 STANDARD POSITION OF NEEDLE GUARD 36 8 FEED DOG HEIGHT SETTING 37 9 EXCHANGE OF PRESSER FOOT 38 10 EXCHANGE OF PRESSER FOOT SPRING PLATE A 40 11 BLADE EXCHANGE AND ADJUSTMENT 41 8 AIR COMPRESSED THREAD TRIMMER OPTIONAL MANUAL 43 1 CONSIDERATIONS BEFORE USING 43 2 MODEL NUMBER SETTING 43 3 SENSOR SETTING METHOD 43 4 RELATED PARAMETER 45 5 THREAD TRIMMING MODE SETTING 45 6 THRE...

Page 6: ... Undo a package from the top in order Beware nails in wooden box ⓑ Dust and humidity can cause pollution and corrosion of the machine Air conditioner should be equipped and cleaned regularly ⓒ Do not expose the machine directly to the sun ⓓ Allow at least 50cm of space on each side of the machine for convenient maintenance ⓔ Explosion hazard Do not operate machine in explosive atmospheres where ae...

Page 7: ...ing the cover of any electrical component or control box ⓖ Turn the machine off when threading needles or inspecting the finished sewing ⓗ Do not press the pedals when you turn on the power ⓘ Install the machine away from strong electromagnetic wave such as high frequency welder as far as possible 4 Machine Operation Warning Caution WARNING When you operate machine you should put the cover on to p...

Page 8: ...e without finger guard and safety devices Before threading changing and needle cleaning etc switch off main switch 손가락 보호대와 안전장치 없이 작동하지 마십시오 실 바늘교환시나 청소전에는 반드시 주전원의 스위치를 꺼 주십시오 CAUTION 경 고 CAUTION 경 고 CAUTION 주 의 Do not operate without finger guard and safety devices Before threading changing and needle cleaning etc switch off main switch 손가락 보호대와 안전장치 없이 작동하지 마 십시오 실 바 늘 교 환 시 나 청 소 전 에 는 반 드 시 ...

Page 9: ...9 2 2 ENTIRE STRUCTURES Arm Bed Head Arm support Arm support table Table Motor cover Spool thread stand Pedal Table legs Figure 1 ...

Page 10: ...al sewing knitwear For thin materials For medium heavy materials Max 4 200 s p m in case of intermittent operations 1 6mm 2 5mm Stitches per 25 4mm 10 16 stitches per 30mm 12 19 Sewing machine needles Groz Beckert UY118GKS 4EA Retainer needles Groz Beckert UY36211 1EA M5 5 2mm M6 6 0mm 30mm Max 6mm Adjustment link Max Forward differential feed ratio 1 0 1 5 Max Reverse differential feed ratio 1 0 ...

Page 11: ...11 4 4 INSTALLATIONS Figure 2 1 TABLE INSTALLATION 1 Table type A Table Figure 3 B Arm support table ...

Page 12: ...12 Figure 4 2 Table installation Fix a dust bag with the screw like the figure 4 Assemble a control box like the figure 4 Dust bag Screw Control box ...

Page 13: ... connection then lift a arm support up Combine a clamp screw for the arm support putting cap nut and a nut with the arm support Combine the arm support table with the table using joint bots and nuts Combine the M C body with the arm support using the clamp screw Figure 5 table table legs nut flat washer Yielding rubber arm support table joint bolt clamp screw arm support Cap nut clamp screw Yieldi...

Page 14: ...he thread guide for stand supportⓐ and then fix it with the screwⓓ Assemble the thread guide pipeⓔ 4 GROUND WIRE CONNECTION Connect a ground wire to the base cover and the control box Clamp a ground wireⓐ to the base cover using a screwⓑ Penetrate the ground wireⓐ the hole A on the table Connect the ground wireⓐ to the control box Figure 6 Figure 7 ⓐ ⓑ ⓕ ⓒ ⓓ ⓔ ⓐ ⓑ A ...

Page 15: ... to the cylinder linking plate Assemble the cylinder linking plate with the arm support Adjust the cylinder knuckle to make the distance of 1mm between the cylinder knuckle short screw and the knee lifter connection lever Refer to the figure 9 1 Knee lifter connection leve Assemble the knee lifter connection leverⓐ with the screwⓑ Figure 8 Figure 9 Figure 10 Arm support cylinder linking plate 1mm ...

Page 16: ... partⓐ with the arm Refer to the figure 11 Figure 11 ⓐ ⓑ ⓒ The coupling A ⓑ should be assembled as follows 1 Put the needle bar to the highest point 2 When the needle bar is on the highest point the main crank shaft of M C and the motor shaft will become like the Figure 13 Caution Figure 13 SectionⅠ SectionⅡ Motor shaf Main crank shaft of the M C Section I and Section II is the view from the motor...

Page 17: ... thread cutting base at the center of the front and the side Refer to the figure 15 You should be careful no to intrude into the sensor part when setting the suction pipe Figure 15 Front view Side view Thread cutting block thread cutting base Cutter Cylinder Unit Suction Unit Thread Chain Guide Sensor Unit Sensing Area Suction Pipe Thread Cuting Base Thread Cutting Block Needle Plate Reflective ...

Page 18: ...compressed cylinder and the right side of the upper solenoid valve Connect the air hoseⓓ to the suction pipe and the lower solenoid valve Connect the cableⓕ which is written in PF linking to the control box to the upper solenoid valve Connect the cableⓔ which is written in CL linking to the control box to the lower solenoid valve After installing to the table open the air compressed regulatorⓖ of ...

Page 19: ...nect the air hoseⓓ to the suction pipe and the solenoid valve B Connect the air hoseⓔ to the cutter cylinder and the solenoid valve C Connect the cableⓕ which is written in PF linking to the control box to the solenoid valve A Connect the cableⓖ which is written in CL linking to the control box to the solenoid valve B Connect the cableⓗ which is written in TT linking to the control box to the sole...

Page 20: ...ut breakdown remove the oil cap screwⓐ ⓑ and then lubricate oil to the top limit of the oil gaugeⓒ ⓓ Small quantity of lubricating oil cause the machine breakdown and large quantity of lubricating oil cause the quality deterioration because of the spattering of the oil Caution 3 OIL GAUGE OIL WINDOW Check the oil gaugeⓒ ⓓ before operating the sewing machine Lubricate oil when the oil indicator or ...

Page 21: ...to the 2 LUBICATING OIL for lubricating ⓐ ⓑ 5 OIL PRIMING Prime the oil before operating new machine or the machine not to use for a long time After remove the upper screwⓒ of oil pump housing and oil priming then fix it again with the screwⓒ Refer to the figure 22 6 LUBRICATING OIL REPLENISHMENT Lubricate about 3 4 drops of oil into the oil hole Figure 23 every one time a month If the oil leaks o...

Page 22: ...oil outlet screwⓐ firmly Separate the oil pan from the bed by loosening the oil pan clamp screwⓑ Remove the foreign substances by pulling out a oil filterⓒ Assemble it again in reverse order Refuel referring to the 2 LUBICATING OIL Suction filter cleaning Separate the oil pumpⓔ by loosening the oil pump fixation screwⓓ Remove the foreign substances of the suction filterⓕ Assemble it again in rever...

Page 23: ... table check the catalogue Caution There may not be the retainer needles at the table check the catalogue Caution The sewing needle and the retainer needle has the cutting part on their upper part Insert the needle to tighten the clamp screw Caution Japanese Standard 8 9 10 11 12 14 Metric Standard 60 65 70 75 80 90 Japanese Standard 8 9 10 11 12 Metric Standard 60 65 70 75 80 2 NEEDLE INSTALLATIO...

Page 24: ...hread After threading cut off the remaining thread looper and upper thread out of the hole of the upper thread holder and the looper before sewing Tip The thread tension is loosened when lifting the presser foot then you can draw the thread Figure 27 Check the OFF status condition of a power switch before threading a needle Or you may get injured by the malfunction of the pedal Warning A B C D F E...

Page 25: ...e needle plate Refer to the 6 7 VERTICAL ADJUSTMENT OF PRESSER FOOT This is the standard Adjustment order a Remove the rubber cap ⓒ ⓓ b Undo the screwⓕ in the presser bar lifting lever link large size ⓔ c Adjust the distance by moving the presser bar lifting lever link small size ⓖ to left or right then fix it by tightening the screwⓕ 5 PRESSER FOOT ADJUSTMENT Figure 28 Figure 29 Figure 30 Check t...

Page 26: ...ead adjusting device plate ⓑ Adjustment order a Loosen the clamp screwⓓ in the presser bar lifting lever large size b Adjust the thread release shaftⓒ by rotating with a driver Tip The distance becomes narrow when rotating clockwise the thread release shaft the distance becomes wide when rotating counterclockwise it 6 PRESSER FOOT PRESSURE MODIFICATION To make the presser foot pressure lower is be...

Page 27: ...nutⓐ firmly ⓐ ⓑ ⓒ ⓓ 0 3mm 0 5mm 8 MAIN FEED MODIFICATION Check the OFF status condition of a power switch before modifying the main feed adjustment Warning The stitch length can be modified from 1 6mm to 2 5mm basically regardless of phases and it is able to be modified more or less than the value The following table indicates the stitches per 25 4mm and the stitches per 30mm Loosen the needle gua...

Page 28: ...ust the differential feed dog rotate the differential feed operating leverⓐ to the left or the right If the differential feed operating leverⓐ is between the 4 and 5 the momentums of the main feed dog and the differential feed dog will be the same For the forward differential turn the differential feed operating leverⓐ to the scale of 9 For the reverse differential turn the differential feed opera...

Page 29: ...t the silicone oil after lubricating Caution Ethane silicone oil should be used and check the amount of oil on occasion opening the silicone oil cap 11 OVERLAP WIDTH ADJUSTMENT OF UPPER SEWING MACHINE 1 Standard position of the lower knife Set the distance between the lower knifeⓐ and the lower knife holderⓑ to 0 0 5mm Refer to the Figure 41 2 Standard position of the upper blade Set the distance ...

Page 30: ...adjust the position of the lap formerⓐ according to the edge of the overlapping sewing materials or the feed direction of the fabric 2 Front Rear standard position Set the lap formerⓐ at the position which the lap former slide blockⓑ and the needle plateⓒ are attached Adjust the lap formerⓐ front and rear depends on the thickness of the cloth Figure 42 ⓐ ⓑ ⓓ ⓒ A ...

Page 31: ...ving the needle thread pinⓕ upward and the loop is decreasing when moving the needle thread pinⓕ downward Therefore use it by adjusting properly according to the working conditions 2 Thread guide adjustment Make the thread guide hole height of the needle thread guideⓑ and the thread guide hole height of the fixation block holderⓐ equally Set the needle thread guideⓒ 5mm below the needle thread gui...

Page 32: ...e timing of the looper thread take up lever faster to increase the amount of the looper thread take up lever make the timing slower to decrease the amount of the looper thread take up lever 1 When setting the timing of the looper thread take up lever over the adjustment range it causes the skipped stitches 2 Adjust the thread take up lever back and forth not to approach to the guide support plateⓐ...

Page 33: ...e thread take up lever fixation screwⓔ and set it in order TIP Move the hole of the thread take up leverⓒ downward to increase the amount of the thread take up of the upper thread take up lever and move the hole upward to decrease the amount of the thread take up of the upper thread take up lever 2 Upper thread take up lever timing modification When the upper thread is seized by the upper thread h...

Page 34: ... to the fixation by tightening the upper thread retainer clamp screwⓓ 2 Upper thread holder standard position When the upper thread holderⓑ is at the closest to the upper thread retainerⓐ set the distance between them to 0 4 0 7mm When the upper thread holderⓑ is at the end of the right direction set the distance between the upper thread holderⓑ and the retainer needleⓒ to 0 5mm Set the upper thre...

Page 35: ...tening the clamp screw firmly Refer to the Figure 54 3 Front back position of the looper and the needle When the looperⓐ moves from the left to the right the looper ⓐ should pass through behind the needle Refer to the Figure 55 Set the distance the looperⓐ and the needle to 0 0 05mm to make the looperⓐ is at the closest to the needle Set the looper not to attach to the needle Refer to the Figure 5...

Page 36: ...he looperⓐ and the needle to 0mm when the end of the looperⓐ meets the center of the first needle on the left Then fix it by tightening the needle guard front fixation screwⓒ Figure 57 Figure 58 Figure 59 2 Standard position of the needle guard rear Open the looper cover and loosen the needle guard rear fixation screwⓒ When the needle guard rear ⓑ is at the closest to the needle adjust the distanc...

Page 37: ...dogⓐ by tightening the differential feed dog clamp screwⓔ after loosening the differential feed dog clamp screwⓔ and adjusting the height of the main feed dog ⓑ and feed dog horizontally Refer to the Figure 60 61 2 Fine tuning of the feed dog After fine tuning the feed dog height with the feed bar eccentric pinⓗ by loosening the feed bar eccentric pin clamp screwⓖ which is at the center of the bed...

Page 38: ...pⓐ Refer to the Figure 63 Loosen the presser bar adjusting screwⓑ and the presser bar connection bracket clamp screwⓒ Refer to the Figure 63 Loosen the knife holder guide clamp screwⓓ Refer to the Figure 64 Loosen the knife holder shaft support bar clamp screwⓔ and remove the knife holder shaft support bar A Refer to the Figure 65 Figure 63 Figure 64 Figure 65 ⓓ ⓚ ⓔ ⓕ ⓗ A ⓐ ⓒ ⓑ ⓝ ...

Page 39: ...ure 67 Remove the thread holder crankⓙ from the hook drive sleeveⓘ Refer to the Figure 68 Remove the presser foot among the presser foot guide left right by turning the presser foot to the left Refer to the Figure 68 Insert the replacement presser foot in the presser foot guide left right by turning to the right Refer to the Figure 68 Insert the thread holder crankⓙ into the hook drive sleeve ⓘ Re...

Page 40: ...t is closest to the needle plate modify the presser bar pressure with the presser bar adjusting screwⓑ by referring to the 6 6 PRESSER FOOT PRESSURE ADJUSTMENT Then tighten the presser bar connection bracket ⓝclamp screw ⓒ by pressing the presser bar connection bracket slightly and fix it Close the rubber capⓐ Insert the needle into the needle holder Figure 69 Loosen the presser foot spring plate ...

Page 41: ... guide ⓓ The spring pressure is decreasing when descending the knife holder guide Figure 71 2 Knife removal Remove the knife upper ⓐ by loosening the knife holder guide clamp screwⓔ and the knife clamp screwⓕ Remove the lower bladeⓑ by loosening the lower blade holder clamp screwⓖ 3 Knife reinstallation Fix the replacement lower bladeⓑ with the lower blade holder clamp screwⓖ and fix the knife upp...

Page 42: ...le ⓐ ⓔ parts in order then adjust them by turning the setting screw Bⓕ Refer to the Figure 74 Figure 74 Check that the setting screw Aⓖ is sticking out of the knife support bar base when reassembling and insert into the hole of the knife holder shaftⓗ Caution ⓗ ⓖ ⓑ ⓐ ⓒ ⓓ ⓔ ⓕ ...

Page 43: ...he initial thread trimming operation will not happen 2 MODEL NUMBER SETTING 3 SENSOR SETTING METHOD 1 Sensor setting Sensor position Make a sensor lamp and a needle bar in a straight line Check the normal operation of a sensor Turn the power on without sewing materials When the sensor lamp comes on it means that the sensor operates normally Parameter B Group No 56 Value 102 Remark Use the exclusiv...

Page 44: ...st the detection switch by turning left or right counterclockwise or clockwise You must be well acquainted with the sensor detection adjustment method when adjusting the sensor detection Caution Check the OFF status condition of a power switch before adjusting Warning 2 Clearance between the sensor and the thread trimming device The clearance between the sensor and the thread trimming device is ab...

Page 45: ...switch Pedals in the neutral position before sewing Pedals in the neutral position during sewing Pedals in the neutral position after sewing Function Default value Extent Unit No Parameter Group A Cutting Device Motion Time Setting Cutting Mode Setting Cutting Range Initial Cutting Stitch No Initial Cutting Speed Final Cutting Stitch No Initial Cutting Speed 48 ms 3 0 10 stitch 1000 spm 20 stitch ...

Page 46: ...or the initial end part of the sewing machine Detect the sensor the initial end part of the sewing machine Initial cutting Stitch count setting stitch count refer to the parameter A 41 Speed user pedal speed Final cutting Stitch count setting stitch count refer to the parameter A 48 Speed user pedal speed Finish stitching Start stitching Stitching Detect the sensor the initial end part of the sewi...

Page 47: ...itial cutting impossible final cutting possible Initial cutting possible final cutting impossible Parameter value function remark You must be well acquainted with the main consideration not to be injured by the machine Warning 6 THREAD TRIMMING RANGE SETTING ...

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