SunStar SF 7400 Series User Manual Download

Page: 1 / 50

SSUUNNSSTTAARR M

MAACCHHIINNEERRYY CCOO..,, LLTTDD..

User’s
Manual

SF 7400 Series
SF 7500 Series

High-speed Flat Bed
Interlock Sewing
Machine

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.

E--0

Summary of Contents for SF 7400 Series

Page 1: ...r s Manual SF 7400 Series SF 7500 Series High speed Flat Bed Interlock Sewing Machine 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 51 11 11 10 0 ...

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: ...r Thread G L S Standard For long stitch longer than 2 5mm For short stitch shorter than 1 8mm Shape of Stitch Plate 32 40 48 56 64 Needle Distance 3 2mm 4 0mm 4 8mm 5 6mm 6 4mm UT A UT B Under Thread Trimmer 2 Solenoid Valve Type Under Thread Trimmer 3 Solenoid Valve Type Device ST F CO HE WF ATF TL SL TC BN Top Cover Thread Trimmer Flat Bed Covering Guide Hemming Guide Walking Foot Auto Tape Feed...

Page 4: ...able 11 2 Installation of motor and belt 13 3 Adjustment of belt tension 13 4 Attachment of Belt Cover 13 5 Installing cover for needle bar thread guide 14 6 Installation of thread guide plate 14 5 Sewing speed and rotating direction of pulley 14 6 Lubrication 15 1 Lubricating oil 15 2 Supplying oil 15 3 Oil Gauge and Oil Window 15 4 Oil change 16 5 Cleaning the oil filter 16 7 Standard adjustment...

Page 5: ... Presser Foot Lift 25 6 Relation between Needle and Needle Plate 26 7 Fixing Angle and Height of Looper 26 8 Movement of Looper to the Right 26 9 How to Use Timing Gauge 27 10 Height of Needle Bar 27 11 Longitudinal Position of Needle and Looper 27 12 Needle and Needle Guard Rear 28 13 Needle and Needle Guard Front 29 14 Height of Feed Dogs 29 15 Adjustment of needle and spreader 29 9 Automatic Th...

Page 6: ...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 The machine may not work properly or b...

Page 7: ...ore threading the needle or checking after work ⓗ Do not step on the pedal when turning the power on ⓘ Do not operate the machine with any cooling fan blocked The air filter on control box must be cleaned once a week ⓙ If possible install the machine away from source of strong electrical noise such as high frequency welding machines 4 Operating machine Warning Caution Warning Keep cover in place b...

Page 8: ...ger 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 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 주전원의 스위치를 꺼 주십시오 CAUTION 경 고 CAUTION ...

Page 9: ...ifting cylinder Upper shaft pulley Thread adjusting device Oil gauge Presser foot Main feed regulating button Air wiper Power switch Bobbin stand Safety devices Thread guide cover for needle thread Thread take up lever cover for needle thread Finger guard Safety plate Figure 2 ...

Page 10: ... 407 602 605 General seaming of knitted materials Max 6000 s p m In the case of on and off operation 1 4 3 6mm Stitches per inch 7 18 The number of stitches per 30mm 8 21 UY 128GAS No 65 No 90 Standard No 70 2 needle 3 2 4 0 4 8 5 6 6 mm 3 needle 5 6 6 4 mm 31mm Max 8 0 mm 7 mm if equipped with a spreader Push Button type Max Normal Differential Ratio 1 2 Max Reverse Differential Ratio 1 0 7 Adjus...

Page 11: ...11 4 4 Installation Figure 3 1 Installation of table Types of table A Supporting Board Type ...

Page 12: ... Fig 4 Insert screws into the bed supporting board to fix the bed on the table Place rubber cushions on top of screws for safety Then install the sewing machine Required Number of Spacer A Figure 4 Thickness of Table Number of A 40mm 3 4 12 45mm 2 4 8 50mm 1 4 4 SF 7500 Series ...

Page 13: ...30 s p m of machine 50Hz 60Hz 3 200 3 900 3 400 4 100 3 600 4 400 3 900 4 700 4 300 5 200 4 700 5 700 5 100 6 200 5 500 6 700 Figure 5 5 5mm 61mm 10mm 40 Diameter of Motor Pulley mm 3 Adjustment of belt tension Warning Be sure to turn the power switch off before adjusting belt tension Turn the screw of the motor around Adjust the belt to go in approximately 10 20mm when its center portion is pushe...

Page 14: ...nto the arm as described below in the figure Figure 9 The maximum speed of the sewing machine is 6 000 s p m and 4 000 s p m for commercial use To ensure durability run the sewing machine at 4 000 s p m for 200 hours of operation or 1 month when using the machine for the first time As shown in figure 10 the rotating direction of the lower shaft pulley and upper shaft pulley is clockwise Sewing spe...

Page 15: ...echanical breakdowns and too much may degrade the quality of sewing materials Be sure to adjust the amount of oil appropriately 2 Supplying oil The sewing machine is not oiled when shipped out from the factory To ensure trouble free use of the sewing machine open the upper rubber lid and supply oil to the upper line of the oil gauge Figure 12 Figure 11 3 Oil Gauge and Oil Window Always check the o...

Page 16: ...ightly fasten the oil release screw See 2 Supplying oil to supply new oil Figure 13 5 Cleaning the oil filter Oil will not supply smoothly if dust gets built up in oil filter Check the oil filter once every six months Check the oil filter through the oil window if there is no or only little amount of oil being supplied Before checking the oil filter remove the oil filter cover Clean dust build ups...

Page 17: ...er Then fasten the screw firmly Figure 16 17 Warning Turn the power switch off before installing a needle 1 Needle used This sewing machine uses UY 128GAS needles Needles come in various size Select the most appropriate needle depending on the thickness or the type of sewing materials Japanese size 9 10 11 12 13 14 Metric size 65 70 75 80 85 90 7 7 Standard adjustments of the sewing machine Figure...

Page 18: ...hread in the case of 2 needle sewing machine refer to the above instructions for threading 4 Adjustment of thread tension Thread tension must be adjusted according to the type of threads and fabrics stitch length and other sewing conditions Thread tension can be adjusted by rotating the thread adjusting device cap Turn clockwise to strengthen and counterclockwise to weaken the tension Figure 19 St...

Page 19: ...ain feed Stitch length Stitch length can be adjusted straight from 1 4mm to 3 6 mm The table below shows stitch length number of stitches per inch 25 4mm and per 30 mm After unfastening the screw move the front part of the presser foot left and right to bring the needle to pass the center of the needle passage of the presser foot Warning Be sure to turn the power switch off before adjusting the po...

Page 20: ...the stitch length gets smaller When the mark points at S the stitch length becomes 1 4mm Although graduations are same the corresponding stitch lengths could be different depending on types of fabrics fabric thickness and size of differential Therefore the upper shaft pulley needs to be readjusted depending on situations Caution When using sewing machines mounted with pneumatic trimming devices de...

Page 21: ...r than Graduation C the lever is in the normal differential feed mode The graduations located above Graduation C refer to 1 1 25 1 1 15 1 1 75 and 1 2 from the bottom Figure 26 2 Reverse Differential Feed Stretch Sewing When the differential feed lever is set at the place below Graduation Long it is in the reverse differential feed mode When the lever is set at Graduation S the ratio of main feed ...

Page 22: ...le cooling device and needle thread lubricating device as a standard option The silicon type oil is the most efficient Note Open the silicon oil supply tank cap of the needle cooling device and the needle thread oil supply tank cover of the needle thread oil supply device to check the oil volume When oil is insufficient supply more oil If there is no need for silicon due to specific sewing conditi...

Page 23: ...ore adjustment is needed loosen the screw and check the thread tension while moving the position of the thread eyelet When the thread eyelet is moved in the Y direction the tread tension will increase When it is moved in the X direction the thread tension will decrease The standard setting is to set the distance between the middle of the screw and the upper tip of the thread eyelet at 8mm Figure 2...

Page 24: ...ead loosen the screw to move down the top cover thread eyelet Right in the Y direction This time make sure that the top cover thread passes through the bottom hole as in the right figure Figure 33 3 Adjustment of the Looper Thread Tension The figure shows the looper thread take up The standard setting is to place the thread holes of the looper thread guide at Mark X on the looper thread cast off p...

Page 25: ...r Foot and Amount of Presser Foot Lift Loosen the screw for the presser plate collar Press the lap lift lever and separate the presser foot When the lap lift lever is pressed adjust the maximum height of the presser foot to set the distance between the front face of the needle plate and the bottom of the presser foot at 7 0mm when the spreader is equipped When this adjustment is completed set the ...

Page 26: ...hetablebelow Adjustment can be made by loosening the fixing screw for the looper holder Without exception the distance between the center of the needle bar and the tip of the looper is 6mm regardless of needle distance To make the adjustment of the looper s right side feed volume easy use the looper timing gauge The timing gauge should be purchased as an extra item When it is needed contact the sh...

Page 27: ... and the right needle is nested at corresponding needle distance V groove align the looper with the timing gauge and fasten the looper holder screw Figure 43 In case where three needles are used When the tip of the looper A meets the left needle the needle distance should be 0 2 0 3mm When the tip of the looper A meets the central needle the needle distance should be 0 05 0 15mm When the tip of th...

Page 28: ...looper holder Figure 47 A 0 2 0 3mm Height of Needle Guard Rear When needle guard R is at the lowest point of the needle bar align the center of the needles along the line a of the needle guard R Longitudinal position of needle guard R When the end tip of the looper comes to the center of the right needle press the needle guard R to adjust the clearance between the needle and the looper at 0 0 05 ...

Page 29: ... A and the main feed dog B have the same height and set the height between the front face of the needle plate and the front face of the feed dog at 1 0 1 2mm 15 Adjustment of needle and spreader Fixing of spreader Figure 52 1 0 1 2mm B A Figure 53 Figure 54 Figure 55 a 0 5 0 8mm 4 5 5 5mm 8 5 9 5mm When the spreader moves to the left the clearance between the left needle and the hook tip of the sp...

Page 30: ...hook the thread well onto the thread hooking part Figure 56 Fixing of the top cover thread eyelet When the needle bar is located at the lowest position adjust the front face of the top cover thread guide and the thread hole of the top cover thread eyelet to be at the central line of the top cover thread guide slot and fasten the screw Adjust 1 2 and 3 depending on the type of thread used Figure 57...

Page 31: ...ove under the needle plate to cut the needle thread and looper thread The looper thread will be caught by clamp spring and air wiper will run for two seconds and then presser foot will go up For UT A device lifting of the presser foot and wiper operation will begin at the same time D Leave the pedal at neutral The presser foot will go down 1 Operation Figure 58 Start Neutral Trimming Presser foot ...

Page 32: ...needle thread and looper thread The clamp spring will catch the looper thread after trimming top cover thread and the presser foot will go up For UT A device lifting of the presser foot and wiper operation will begin at the same time D Leave the pedal at neutral The presser foot will go down 2 Operation procedures for ST C device Caution Be sure to place sewing materials under the presser foot bef...

Page 33: ...and 2 Wiring 1 Limit switch Figure 60 B Connecting limit switch a General Servo motor A Fortuna Ⅲ Link the limit switch cord to the 12P connector as follows Figure 61 White White Black Black Switch and lamp connector White Black Switch and lamp connector b Small motor A Fortuna Ⅳ Link the limit switch cord to 8P connector as follows Figure 62 White Black ...

Page 34: ...ce will not work if the cords are plugged in incorrectly to opposite power 2 Connecting solenoid valve A General Servo Motor Fortuna Ⅲ servo motor Figure 63 Standard solenoid connector Knee lifting solenoid connector Green Figure 64 Standard solenoid connector Knee lifting solenoid connector Green Solenoid valve number Solenoid valve application Connector type Pin number 1 Presser foot lifting Kne...

Page 35: ...ndard solenoid connector 2 signal 6 3 Top cover thread trimming Standard solenoid connector 3 signal 7 a For UT B device Press solenoid valve buttons to check how each device moves If the device does not work check the cords For the pneumatic solenoid valve carries polarity check the connection between the cable and the connector The device will not work if the cords are plugged in incorrectly to ...

Page 36: ...2 10 signal 2 Lower trimming Standard solenoid connector 11 signal 3 Figure 68 Standard solenoid connector c For ST C device Press solenoid valve buttons to check how each device moves If the device does not work check the cords For the pneumatic solenoid valve carries polarity check the connection between the cable and the connector The device will not work if the cords are plugged in incorrectly...

Page 37: ...37 3 Air pressure wiring map 1 UT B device Figure 69 2 5 4 350mm 2 5 4 400mm 2 5 4 150mm 2 5 4 300mm 2 5 4 300mm 4 6 1 500mm solenoid valve air pressure 0 4MPa 0 5MPa 4Kgf cm2 5Kgf cm2 IN OUT ...

Page 38: ...38 2 UT A device Figure 70 2 5 4 150mm IN OUT 2 5 4 200mm 2 5 4 200mm 2 5 4 150mm 2 5 4 300mm 2 5 4 300mm 4 6 1 500mm solenoid valve air pressure 0 4MPa 0 5MPa 4Kgf cm2 5Kgf cm2 ...

Page 39: ...39 3 ST C device Figure 69 2 5 4 350mm 2 5 4 600mm 2 5 4 580mm 2 5 4 300mm 2 5 4 300mm 4 6 1 500mm solenoid valve air pressure 0 4MPa 0 5MPa 4Kgf cm2 5Kgf cm2 ...

Page 40: ...changed 4 Installation of synchronizer sensor Figure 72 Warning Leave the trimming cylinder plug pulled off from the control box in the motor Otherwise parts can be damaged 6 To see whether the needle bar is located at 0 5mm below the highest point press the pedal and run the machine Figure 73 Caution 1 At this point the needle bar should be positioned at the highest point 2 The optimal condition ...

Page 41: ...tus of the automatic thread trimmer should be re adjusted when air cylinder stroke changes Check the status of the limit switch When the looper is located on the furthest left side move the moving mes to the left Adjust the tip of the moving mes to make it pass 14mm away from the looper on the right side above the looper s ridge Loosen the screw to make the adjustment 2 Position of moving mes Figu...

Page 42: ... in the W direction To narrow down the distance turn the trimming connecting rod in the N direction d Tightly fasten the nuts Tightly fasten the nuts and confirm whether the trimming device connecting rod and the moving mes body are operating smoothly 3 Adjustment of Moving Mes and Needle Figure 76 Figure 77 Figure 78 2 5 3 0mm W N Warning Before adjustments always turn off the motor switch and ch...

Page 43: ... adjust the tip of the hook for looper thread to pass by the rim of the clamp spring And adjust the inner side of the moving mes to pass by the rim of the clamp spring Loosen the screw for adjustment 5 Adjustment of Moving Mes Fixed Mes and Clamp Spring Figure 80 Ⅰ Ⅰ Ⅱ Ⅱ 0 1 0 3mm The fixed mes and the moving mes overlap around 0 2 0 5mm When the moving mes moves to the right in full loosen the sc...

Page 44: ...ining thread shorter locate the clamp spring on the left side To make the remaining thread longer locate the clamp spring on the right side When the plunger of the cylinder is on the left side adjust the distance between the blade of the fixed mes body and the fixed mes stopper small at 1 5 2 0mm If the trimming device doesn t operate Loosen the screw for adjustment 7 Adjustment of Remaining Threa...

Page 45: ...ip of the looper hook should pass in front of the looper thread When the moving mes returns the needle thread and the looper thread should be caught by the hooks respectively And the threads should be cut by the fixed mes If the moving mes doesn t operate properly adjust the distance between the left needle and the tip of the needle thread hook at over 2 5 3 0mm See Fig 76 Adjustment of Moving Mes...

Page 46: ...ways turn off the motor switch and check to make sure that the motor is in stop mode Figure 88 A Loosen the nut of the thread trimming air cylinder B Adjust the holder for limit switch bracket to bring the thread tension release connecting plate to come between the screw head and the tension release lever C Tighten the nut 2 Thread tension release connecting plate Figure 89 A Loosen the screw of t...

Page 47: ...rator opens as fast as possible C Loosen the screw to set a clearance of 35mm between the top of the thread pull off bar and the top of the guide for thread pull off bar D With the screw fix the thread pull off bar onto the thread pull off bar holder E Loosen the screw F Set a clearance of 4 0mm between the collar for thread pull off bar and the guide for thread pull off bar G Fasten the screw 4 T...

Page 48: ...ll off hook unit A 22 To increase bring the unit down 5 Thread pull off hook unit Figure 91 35mm 4mm 21 22 23 Caution A Use the thread pull off hook B unit 23 only when you are using wool thread for the looper thread When the thread pull off hook B unit 23 is not in use bring it up so that thread does not get caught B Do not force the thread pull off hook A unit 22 up Stitches may not be formed wh...

Page 49: ...l the amount of air with the speed controller To reduce the air turn the screw clockwise and to increase turn it counter clockwise 7 Adjustment of air wiper Warning Before adjustments always turn off the motor switch and check to make sure that the motor is in stop mode Figure 92 1mm 2mm Figure 93 IN OUT Caution 1 Keep the air level to the minimum as long as the machine functions well 2 If air get...

Page 50: ...is at the lowest point turn the knuckle for knee lifting air cylinder to bring up the presser foot by 5mm 7mm 8 Presser foot lifter mechanism Figure 94 Warning Before adjustments always turn off the motor switch and check to make sure that the motor is in stop mode ...

Search results

Summary of Contents for SF 7400 Series

Reviews:

Related manuals for SF 7400 Series

Brands by name

Popular brands

SunStar SF 7400 Series, User Manual

Search results

Summary of Contents for SF 7400 Series

Reviews:

Related manuals for SF 7400 Series

Brands by name

Popular brands