Related Manuals for SunStar SC 7900-Series
Summary of Contents for SunStar SC 7900-Series
- Page 1 USER S MANUAL SC 7900-Series 1) Read all instructions before using the machine to prevent trouble. 2) Keep the instructions and refer to it during machine failures.
- 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.
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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) THREAD TENSION ADJUSTMENT -------------------------------------------------------------------------- 31 2) LOOPER THREAD TENSION ADJUSTMENT ------------------------------------------------------------- 32 3) UPPER THREAD TENSION ADJUSTMENT---------------------------------------------------------------- 33 4) NEEDLE HEIGHT SETTING------------------------------------------------------------------------------------ 33 5) UPPER THREAD RETAINER ----------------------------------------------------------------------------------- 34 6) ADJUSTMENT 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. Read thoroughly the following instructions. Read thoroughly and fully understand the manual before operating the machine. Dress for safety. Keep your hands or head away from the moving parts of the machine such as needle, looper, spreader, take-up lever, and pulley when the machine is in operation. -
Page 8: Placement Of Caution Stickers
CAUTION STICKERS is attached on the machine for the safety. Read thoroughly the manual before operating the machine. -
Page 9: Entire Structure
ENTIRE STRUCTURES Head Arm support Arm support table Table Motor cover Spool thread stand Pedal Table legs... -
Page 10: Specifications
SPECIFICATIONS Explanation High-speed Cylinder bed 4-needle interlock sewing machine (the Arm type) Stitch form ISO 406, 605, 608 General sewing (knitwear) Sewing speed 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 Sewing machine needles: Groz-Beckert UY118GKS Needle Retainer needles: Groz-Beckert UY36211... -
Page 11: Installation
INSTALLATIONS 1) TABLE INSTALLATION (1) Table type A. Table B. Arm support table... - Page 12 (2) Table installation Fix a dust bag with the screw like the figure 4. Assemble a control box like the figure 4.
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Page 13: M/C Installation
2) M/C INSTALLATION Assemble table legs. Put the assembled legs and a table together. Place a rubber washer on the linking part of the table and put a arm support table on it. Set a buffer rubber onto the arm support 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. -
Page 14: Thread Guide For Stand Support Installation
3) THREAD GUIDE FOR STAND SUPPORT INSTALLATION Assemble a thread guide for stand support onto a support bracket . Put the thread guide plate on the 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. -
Page 15: Air-Compressed Pressure Bar Lifter Installation
5) AIR-COMPRESSED PRESSURE BAR LIFTER INSTALLATION An air-compressed pressure bar lifter is composed of several parts. Assemble an air-compressed cylinder and an assembled device with cylinder knuckles 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. -
Page 16: Direct Motor Installation
6) DIRECT MOTOR INSTALLATION Assemble the arm-fix bracket and the assembled part with the arm. (Refer to the figure 11) Assemble the coupling A to be 11.2mm in the arm-fix bracket. (Refer to the figure 12) Fix the coupling A( ) to the main crank shaft. (Refer to the figure 13) Assemble the motor parts( ) and the motor cover. -
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) Assemble the thread cutting block and the 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. -
Page 18: Air-Compressed Device Installation
8) AIR-COMPRESSED DEVICE INSTALLATION (1) Specification Connect the air hose to the manifolder block of the filter regulator and solenoid valve. Connect the air hose to the upper fitting of the air-compressed cylinder and the left side of the upper solenoid valve. Connect the air hose to the lower fitting of the air-compressed cylinder and the right side of the upper solenoid valve. - Page 19 (2) Air-compressed device (optional) installation Connect the air hose to the manifolder block of the filter regulator and solenoid valve. Connect the air hose to the upper fitting of the air-compressed cylinder and the left side of the solenoid valve A. Connect the air hose to the lower fitting of the air-compressed cylinder and the right side of the solenoid valve A.
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Page 20: Lubrication
LUBRICATION 1) OIL Use the industrial sewing machine oil which is provided by SUNSTAR or SF oil from YANASE. 2) LUBICATING OIL This sewing machine is shipped without oil. To use the machine without breakdown, remove the oil cap screw ,... -
Page 21: Lubricating Oil Exchange
4) LUBRICATING OIL EXCHANGE Change the oil during the first month every 200 hours and then change it two times per year. If not, the life of the sewing machine is going down. Discharge the lubricating oil by loosening the oil outlet screw After discharging, fix the oil outlet screw firmly. -
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 Discharge the lubricating oil by loosening the oil outlet screw After discharging, fix the oil outlet screw firmly. -
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. (2) Retainer needle This sewing machine uses the UY36211 sized needles made by from Groz-Beckert. -
Page 24: Threading
3) THREADING 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 fancy thread, F is the looper thread. After threading, cut the scrap of thread before stitching. -
Page 25: Thread Tension Adjustment
4) THREAD TENSION ADJUSTMENT Adjust 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. (Refer to the Figure 28) : needle thread : upper thread : looper thread... -
Page 26: Presser Foot Pressure Adjustment
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. Loosen the fixing nut . b. -
Page 27: Vertical Adjustment Of Presser Foot
7) VERTICAL ADJUSTMENT OF PRESSER FOOT Set the needle bar to the lowest point. 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.) Adjust the distance between the presser foot base and the presser foot spring plate A to 0.3~0.5mm. -
Page 28: Differential Feed Adjustment
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.) After adjusting the needle guard(back) to the proper position and tighten the needle guard(back) clamp screw firmly. -
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 to the silicone oil tank . -
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 according to the edge of the overlapping sewing materials or the feed direction of the fabric. -
Page 31: Detailed Adjustments
DETAILED ADJUSTMENTS 1) THREAD TENSION ADJUSTMENT (1) Thread pin adjustment 4 sewing needles have the thread pins that adjust each thread tension. Put the thread take-up lever to the lowest point. Loosen the thread pin clamp screw and set the height of the thread pin to the first on the left of the take-up lever , then fix it by tightening the thread pin clamp... -
Page 32: Looper Thread Tension Adjustment
2) LOOPER THREAD TENSION ADJUSTMENT (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 adjustment The timing setting standard of the looper thread take-up is to set the looper thread through the point A when the needle... -
Page 33: Upper Thread Tension Adjustment
3) UPPER THREAD TENSION ADJUSTMENT (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 and adjust the the thread take-up lever . -
Page 34: Upper Thread Retainer
Adjust the needle bar like the above. Tighten the needle bar clamp screw firmly and close the rubber cap . 5) UPPER THREAD RETAINER (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 is at the closest to the needle. -
Page 35: Adjustment Of Needle And Looper Timing
6) ADJUSTMENT OF NEEDLE AND LOOPER TIMING (1) Standard height of the looper Insert the looper into the end of the looper holder . Loosen the looper clamp screw and fix it by tightening the clamp screw firmly. (Refer to the Figure 54) (2) Distance between the looper and the needle When the looper goes to the farthest part from the needle,... -
Page 36: Standard Position Of Needle Guard
7) STANDARD POSITION OF NEEDLE GUARD (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 the needle to 0mm when the end of the looper meets the center of the first needle on the left. -
Page 37: Feed Dog Height Setting
8) FEED DOG HEIGHT SETTING Differential feed dog and the main feed dog is set to be adjusted independently. (1) Standard height of the feed dog Loosen the main feed dog clamp screw . When the feed dog height is on the top, adjust the part A of the main feed at the needle plate to the 1.2~1.5mm. -
Page 38: Exchange Of Presser Foot
9) EXCHANGE OF PRESSER FOOT Remove the needle in the needle holder. Remove the rubber cap . (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 . - Page 39 Loosen the presser foot clamp screw . (Refer to the Figure 66) Put to the highest point of the needle bar by rotating the hand pulley. Remove the presser adjusting screw and lift the presser bar by using the presser bar pressure adjusting spring . (Refer to the Figure 67) Remove the thread holder crank from the hook drive...
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Page 40: Exchange Of Presser Foot Spring Plate A
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) Check that the presser foot does move smoothly up and down not to move left and right. If not, loosen the presser foot guide clamp screw and fix it after resetting the presser foot guide . -
Page 41: Blade Exchange And Adjustment
11) BLADE EXCHANGE AND ADJUSTMENT (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 the needle plate and the knife(upper) is near the lower blade . - 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)
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Page 43: Air-Compressed Thread Trimmer (Optional) Manual
AIR-COMPRESSED THREAD TRIMMER (OPTIONAL) MANUAL 1) CONSIDERTIONS BEFORE USING Check the OFF-status condition of a power switch before adjusting the machine. When setting the related sensor detection, refer to the following “8-3) SENSOR SETTING METHOD”. Put the end part of the sewing material at the front before sewing. 2) MODEL NUMBER SETTING 3) SENSOR SETTING METHOD sensor... - Page 44 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 76. 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 Check the normal operation of a sensor”.
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Page 45: Related Parameter
4) RELATED PARAMETER “ ” “ ” 5) THREAD TRIMMING MODE SETTING (1) Manual thread trimming mode by the knee switch Pedals in the neutral position before sewing Pedals in the neutral position during sewing Pedals in the neutral position after sewing... - Page 46 (2) Operation process of “Auto thread trimming mode 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. thread trimming process (3) Operation process of “Auto thread trimming mode 2” feature: The sewing material is feeding as much as the stitches after detecting the sensor.
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Page 47: Thread Trimming Range Setting
6) THREAD TRIMMING RANGE SETTING...