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S S u u n n S S t t a a r r C C O O . . , , L L T T D D . .
R
USER ' ' S MANUAL
SC 7900-Series
D D i i r r e e c c t t D D r r i i v v e e , , 4 4 - - N N e e e e d d l l e e F F l l a a t t S S e e a a m m e e r r
F F e e e e d d o o f f f f t t h h e e A A r r m m t t y y p p e e
1) Read all instructions before using the
machine to prevent trouble.
2) Keep the instructions and refer to it during
machine failures.
M M M M E E - - 1 1 1 1 0 0 2 2 1 1 6 6
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Related Manuals for SunStar SC 7900-Series
Summary of Contents for SunStar SC 7900-Series
- Page 1 USER ’ ’ S MANUAL SC 7900-Series D D i i r r e e c c t t D D r r i i v v e e , , 4 4 - - N N e e e e d d l l e e F F l l a a t t S S e e a a m m e e r r...
- Page 2 1. Thank you very much for buying a HIGH-SPEED OVERLOCK sewing machine. SUNSTAR will satisfy you by manufacturing the industrial 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.
- Page 3 MODEL CLASSIFICATION Code Cutting Type Code Application One Side Trimming Light Materials SC SunStar Chain Stitch Machine Both Side Trimming Medium-Heavy Materials SC 7900 - 02 M6 A Code Needle Distance 4-Needle Flat Seamer 5.2mm 6.0mm...
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Page 4: Table Of Contents
Table of Contents 1. SAFETY RULES ------------------------------------------------------------------------------------- 6 1) MACHINE DELIVERY ------------------------------------------------------------------------------------------- 2) MACHINE INSTALLATION------------------------------------------------------------------------------------- 3) MACHINE REPAIR ------------------------------------------------------------------------------------------------ 4) MACHINE OPERATION ----------------------------------------------------------------------------------------- 5) SAFETY DEVICE -------------------------------------------------------------------------------------------------- 6) PLACEMENT OF CAUTION STICKERS -------------------------------------------------------------------- 7) CONTENTS OF CAUTION STICKERS----------------------------------------------------------------------- 2. ENTIRE STRUCTURE ----------------------------------------------------------------------------- 9 3. - Page 5 7. DETAILED ADJUSTMENTS --------------------------------------------------------------------- 31 1) NEEDLE THREAD TENSION MODIFICATION ----------------------------------------------------------- 31 2) LOOPER THREAD TENSION MODIFICATION ----------------------------------------------------------- 32 3) UPPER THREAD TENSION MODIFICATION-------------------------------------------------------------- 33 4) NEEDLE HEIGHT SETTING------------------------------------------------------------------------------------ 33 5) UPPER THREAD RETAINER ----------------------------------------------------------------------------------- 34 6) MODIFICATION OF NEEDLE AND LOOPER TIMING-------------------------------------------------- 35 7) STANDARD POSITION OF NEEDLE GUARD ------------------------------------------------------------- 36 8) FEED DOG HEIGHT SETTING--------------------------------------------------------------------------------- 37 9) EXCHANGE OF PRESSER FOOT ----------------------------------------------------------------------------- 38...
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Page 6: Safety Rules
[Reference] details of the machine installation are illustrated in 4. INSTALLAION. 3) Machine Repair 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. -
Page 7: Machine Operation
SC 7900 Series is designed for applying sewing to knitwear and other similar materials. 4) Machine Operation Read thoroughly the following instructions. ⓐ Read thoroughly and fully understand the manual before operating the machine. ⓑ Dress for safety. ⓒ Keep your hands or the parts of the body away from the moving parts of the machine such as needle, looper, and take-up lever when the machine is in operation. -
Page 8: Safety Device
CAUTION STICKERS is attached on the machine for the safety. 6) Placement of Read thoroughly the manual before operating the machine. Caution Sticker CAUTION 주 의 Do not operate without finger guard and safety devices. Before threading, changing and needle, cleaning etc. switch off main switch. -
Page 9: Entire Structure
ENTIRE STRUCTURES ⑧ ⑦ ⑤ ④ ③ ① ⑥ ② ⑩ ⑨ [ Figure 1 ] ① Arm ② Bed ③ Head ④ Arm support ⑤ Arm support table ⑥ Table ⑦ Motor cover ⑧ Spool thread stand ⑨ Pedal ⑩... -
Page 10: Specifications
SPECIFICATIONS Model SC 7900 Series Explanation Motor direct connection type 4-needle interlock sewing machine (the Arm type). Stitch form ISO 607 General sewing (knitwear), For thin materials, For medium-heavy materials Sewing speed Max. 4,200 s.p.m (in case of intermittent operations) 1.6mm~2.5mm Stitch width Stitches per 25.4mm: 10~16, stitches per 30mm: 12~19... -
Page 11: Installation
INSTALLATIONS 1) TABLE INSTALLATION (1) Table type A. Table [ Figure 2 ] B. Arm support table [ Figure 3 ]... - Page 12 (2) Table installation Screw Control box Dust bag [ Figure 4 ] ① Fix a dust bag with the screw like the figure 4. ② Assemble a control box like the figure 4.
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Page 13: M/C Installation
2) M/C INSTALLATION arm support clamp screw Cap nut joint bolt clamp screw Yielding rubber M/C body arm support table Yielding rubber flat washer table table legs [ Figure 5 ] ① Assemble table legs. ② Put the assembled legs and a table together. ③... -
Page 14: Thread Guide For Stand Support Installation
3) THREAD GUIDE FOR STAND SUPPORT INSTALLATION ⓒ ⓔ ① Assemble a thread guide for stand supportⓐ and a support rodⓕ onto a support bracketⓑ. ② Put the thread guide plateⓒ on the thread guide for stand ⓓ supportⓐ and then fix it with the screwⓓ. ③... -
Page 15: Air-Compressed Pressure Bar Lifter Installation
5) AIR-COMPRESSED PRESSURE BAR LIFTER INSTALLATION Arm support An air-compressed pressure bar lifter is composed of several parts. ① Assemble an air-compressed cylinder and an assembled device with cylinder knuckles to the cylinder linking plate. ② Assemble the cylinder linking plate with the arm support. cylinder linking plate [ Figure 8 ]... -
Page 16: Direct Motor Installation
6) DIRECT MOTOR INSTALLATION ① Assemble the arm-fix bracket and the assembled partⓐ with the arm. (Refer to the figure 11) ⓐ ⓒ ⓑ [ Figure 11 ] ② Assemble the coupling A to be 2mm in the arm-fix bracket. (Refer to the figure 12) Coupling A Motor... -
Page 17: Air-Compressed Tread Trimming Device (Optional) Installation
7) AIR-COMPRESSED THREAD TRIMMING DEVICE (OPTIONAL) INSTALLATION An air-compressed thread trimming device is composed of several parts. (G-CT-0002) Cutter Cylinder Unit Suction Unit Thread Chain Guide Thread Cuting Base Sensor Unit Sensing Area Thread Cutting Block Suction Pipe Needle Plate(Reflective) [ Figure 14 ] ①... -
Page 18: Air-Compressed Device Installation
8) AIR-COMPRESSED DEVICE INSTALLATION (1) Specification Table setting position ⓖ ⓐ ⓕ ⓔ ⓑ ⓓ ⓒ [ Figure 16 ] ① Connect the air hoseⓐ to the manifolder block of the filter regulator and solenoid valve. ② Connect the air hoseⓑ to the upper fitting of the air-compressed cylinder and the left side of the upper solenoid valve. ③... - Page 19 (2) Air-compressed device (optional) installation ⓘ ⓐ ⓕ ⓑ ⓖ ⓗ ⓔ ⓓ ⓒ [ Figure 17 ] ① Connect the air hoseⓐ to the manifolder block of the filter regulator and solenoid valve. ② Connect the air hoseⓑ to the upper fitting of the air-compressed cylinder and the left side of the solenoid valve A. ③...
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Page 20: Lubrication
Check the OFF-status condition of a power switch before lubricating. Warning 1) OIL Use the industrial sewing machine oil which is provided by SUNSTAR or SF oil from YANASE. Do not put foreign substances into the lubricating oil to prevent oil from aging of and breaking down. -
Page 21: Lubricating Oil Exchange
4) LUBRICATING OIL EXCHANGE Change the oil during the first month every 200 hours and then change it once every 6 months to extend the life of the sewing machine. The change procedure is as follows. ① Discharge the lubricating oil by loosening the oil outlet screw ⓐ, ⓑ. ②... -
Page 22: Oil Filter Cleaning
7) OIL FILTER CLEANING Clean the suction filter and the oil filter 2~3 times a year. Clean as followings. - Oil filter cleaning ① Discharge the lubricating oil by loosening the oil outlet screw ⓐ ② After discharging, fix the oil outlet screwⓐ firmly. ③... -
Page 23: Standard Adjustments
STANDARD ADJUSTMENTS 1) NEEDLE (1) Sewing needle This sewing machine uses the UY118GKS sized needles made by from Groz-Beckert. Select the proper needle according to the thickness and type of the sewing materials because of the various size of needle. Japanese Standard Metric Standard There may not be the sewing needles at the table, check the catalogue... -
Page 24: Threading
3) THREADING [ Figure 27 ] Thread a needle referring to the [Figure 27]. If not, the problems can be happened such as stitch skip, thread cutting, irregular tension etc. A, B, C and D are the needle thread, E is the upper thread, F is the looper thread. -
Page 25: Thread Tension Modification
4) THREAD TENSION MODIFICATION ⓐ ⓑ Modify differently the thread tension by the thread, fabric, stitch ⓒ width and other sewing conditions. ⓓ The thread tension is adjusted by rotating nuts(ⓐ~ⓕ). When ⓔ rotating clockwise, the tension is stronger. When rotating counterclockwise, the tension is weaker. -
Page 26: Presser Foot Pressure Modification
② Set the distance between the needle holderⓐ at the lowest of the needle bar and the upper thread holderⓑ to 0.3mm. This is the standard. The presser foot is lifted when pressing the pedal backward. ▶ ▶ Adjustment order a. -
Page 27: Vertical Modification Of Presser Foot
7) VERTICAL MODIFICATION OF PRESSER FOOT Check the OFF-status condition of a power switch before modifying the presser foot position. Warning ① Set the needle bar to the lowest point. ② Loosen the pressure adjustment fixation nutⓐ and adjust it by rotating the pressure adjustment nutⓑ. (When rotating the pressure adjustment nut counterclockwise, the presser foot is lifting.) ③... -
Page 28: Differential Feed Modification
④ After adjusting the stitch length, fix it firmly by tightening the feed rocker link shaft screwⓓ then fill the left screwⓒ of the bed. (The left screwⓒ of the bed is to prevent oil leakage so tighten it firmly.) ⑤... -
Page 29: Thread Lubricating Device
10) THREAD LUBRICATING DEVICE When sewing at a high speed or using synthetic fiber thread and ⓐ sewing material, it causes the skipped stitches and thread breakage. This sewing machine basically has the thread lubricating device to handle this problem. Fix the silicone oil felt bracketⓐ... -
Page 30: Using A Lap Former
12) USING A LAP FORMER (1) Left / Right standard position Make an array of the lap former A point at the center of the 4 sewing needles. Loosen the clamp screwⓓ and adjust the position of the lap ⓒ formerⓐ... -
Page 31: Detailed Adjustments
DETAILED ADJUSTMENTS 1) NEEDLE THREAD TENSION MODIFICATION Check the OFF-status condition of a power switch before setting up. Warning (1) Thread pin adjustment 4 sewing needles have the thread pins that adjust each thread tension. ① Put the thread take-up leverⓐ to the lowest point. ②... -
Page 32: Looper Thread Tension Modification
2) LOOPER THREAD TENSION MODIFICATION Check the OFF-status condition of a power switch before setting up. Warning (1) Looper threads take-up lever guide standard position ⓑ Align the right end of the looper thread take-up guideⓐ with the right end of the guide support plateⓑ. (Refer to the Figure 46) (2) Looper threads take-up lever timing modification The timing setting standard of the looper thread take-up is to... -
Page 33: Upper Thread Tension Modification
3) UPPER THREAD TENSION MODIFICATION Check the OFF-status condition of a power switch before setting up. Warning (1) Thread take-up lever thread guide hole standard position Set the distance between the thread take-up holder baseⓓ and the thread guide hole of the thread take-up lever to 4.4mm. (Refer to the Figure 48) Loosen the thread take-up lever fixation screwⓔ... -
Page 34: Upper Thread Retainer
③ Adjust the needle barⓑ like the above. ④ Tighten the needle bar clamp screwⓒ firmly and close the rubber capⓐ. ⓑ ⓒ ⓐ [ Figure 49 ] 5) UPPER THREAD RETAINER Check the OFF-status condition of a power switch before setting up. Warning (1) Upper thread retainer standard position Set the upper thread retainer to the first and second needle behind on the left when the upper thread retainerⓐ... -
Page 35: Modification Of Needle And Looper Timing
ⓔ 0.5mm ⓒ ⓑ ⓓ [ Figure 52 ] [ Figure 53 ] 6) MODIFICATION OF NEEDLE AND LOOPER TIMING Check the OFF-status condition of a power switch before modifying. Warning (1) Standard height of the looper Insert the looperⓐ into the end of the looper holderⓑ. ⓐ... -
Page 36: Standard Position Of Needle Guard
7) STANDARD POSITION OF NEEDLE GUARD Check the OFF-status condition of a power switch before modifying. Warning (1) Standard position of the needle guard (front) Loosen the needle guard (front) fixation screwⓒ. Adjust the needle guard (front)ⓑ for the distance between the looperⓐ and the needle to 0mm when the end of the looperⓐ... -
Page 37: Feed Dog Height Setting
8) FEED DOG HEIGHT SETTING Check the OFF-status condition of a power switch before setting up. Warning Differential feed dogⓐ and the main feed dogⓑ is set to be adjusted independently. Move the needle guard (rear) farthest from the differential feed dogⓐ before adjusting the feed dog height. -
Page 38: Exchange Of Presser Foot
9) EXCHANGE OF PRESSER FOOT Check the OFF-status condition of a power switch before exchanging the presser foot. Warning ① Remove the needle in the needle holder. ⓑ ② Remove the rubber capⓐ. (Refer to the Figure 63) ③ Loosen the presser bar adjusting screwⓑ and the presser bar connection bracket clamp screwⓒ... - Page 39 ⑥ Loosen the presser foot clamp screwⓕ. (Refer to the Figure 66) ⓗ ⓕ [ Figure 66 ] ⑦ Put to the highest point of the needle bar by rotating the hand ⓑ pulley. ⑧ Remove the presser adjusting screwⓑ and lift the presser bar ⓖ...
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Page 40: Exchange Of Presser Foot Spring Plate A
⑬ Insert the presser barⓗ into the presser foot by pushing to the end and fix it by tightening the presser foot clamp screwⓕ. (Refer to the Figure 69) ⑭ Check that the presser foot does move smoothly up and down not to move left and right. -
Page 41: Blade Exchange And Adjustment
11) BLADE EXCHANGE AND ADJUSTMENT Check the OFF-status condition of a power switch before adjusting. Warning (1) Knife (upper) pressure When the needle bar is at the lowest point and the knife(upper)ⓐ is the very left, the presser foot is attached to ⓑ... - Page 42 (4) Adjustment of the knife (upper) and lower blade meshing angle Disassemble ⓐ~ⓔ 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ⓖ...
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Page 43: Air-Compressed Thread Trimmer (Optional) Manual
AIR-COMPRESSED THREAD TRIMMER (OPTIONAL) MANUAL You must be well acquainted with the main consideration not to be injured by the machine. Warning 1) CONSIDERTIONS BEFORE USING ① Check the OFF-status condition of a power switch before adjusting the machine. ② When setting the related sensor detection, refer to the following “8-3) SENSOR SETTING METHOD”. ③... - Page 44 ③ Sensor detection adjustment a. Turn the detection switch to the MAX. b. Turn the detection switch 180 degree to the MIN in reverse like the Figure 78. c. Adjust the sensor detection to make sensor lamp comes on when there is not sewing material and goes out when there is sewing material like “②...
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Page 45: Related Parameter
4) RELATED PARAMETER Parameter Default value Extent Unit Function 4~1020 Cutting Device Motion Time 48[ms] 48[ms] Refer to “5) Thread Setting Cutting Mode trimming mode setting” Refer to “6) Thread Setting Cutting Range trimming range setting” 0~255 Group A Initial Cutting Stitch No 10[stitch] 1[stitch] 20~3800... - Page 46 (2) Operation process of “Auto thread trimming mode 1” ① feature: During pressing the pedals, the initial cutting and the final cutting is performed counting as much as the setting values after sensor detecting. ② thread trimming process Initial cutting Final cutting Detect Detect the...
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Page 47: Thread Trimming Range Setting
6) THREAD TRIMMING RANGE SETTING Parameter value function remark Initial/final cutting possible Initial cutting impossible/ Group A final cutting possible No.38 Initial cutting possible/ final cutting impossible You must be well acquainted with the main consideration not to be injured by the machine. Warning...
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