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S S U U N N S S T T A A R R M M A A C C H H I I N N E E R R Y Y C C O O . . , , L L T T D D . .
User's
Manual
KM-757
High speed, two needle, drop
feed, needle feed, sewing
machine with automatic
thread trimmer.
KM- 797
High speed, two needle, drop
feed, needle feed, sewing
machine with automatic
thread trimmer for each
needle.
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 M M M E E - - 0 0 5 5 0 0 6 6 2 2 9 9
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Related Manuals for SunStar KM-757
Summary of Contents for SunStar KM-757
- Page 1 User’s Manual KM-757 High speed, two needle, drop feed, needle feed, sewing machine with automatic thread trimmer. KM- 797 High speed, two needle, drop feed, needle feed, sewing machine with automatic thread trimmer for each needle. 1. For proper use of the machine, thoroughly read this manual before use.
- Page 2 Thank you for purchasing our product. The upgraded KM-757 km-797 Series, built on valuable technology and experience drawn from years of production of automatic thread trimming sewing machines, features new FORTUNA AC SERVO automatic thread trimming motor designed to fully realize the Mechatronics of the sewing machine industry.
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Page 3: Table Of Contents
Table of Contents Safety rules for machines ............................. 4 1. Specification 1) Sewing machine ................................. 8 2) Servo motor ................................9 3) 470 motor ................................... 9 4) 470 motor controller ..............................9 5) Clutch motor (for non-trimming type) ........................9 6) Peripheral automation devices (optional) ........................ -
Page 4: Safety Rules For Machines
Safety Rules for Machines Safety labels in the manual are categorized into danger, warning and caution. Failure to follow the safety rules may result in physical injuries or mechanical damages. The safety labels and symbols are defined as follows. [The meaning of the safety labels] Danger Instructions here shall be observed strictly. - Page 5 1-1) Machine Only personnel with a full understanding of the safety rules should move the mobilization machines. The following directions must be observed when delivering the machines. ⓐ At least two persons should work together. ⓑ In case the machine should be transported, please wipe the oil covered on the machine to prevent accidents.
- Page 6 1-4) Machine KM-757/797 series are manufactured for industry use to sew textiles and other similar Operation material. In case of running the machine, users should observe the following things. ⓐ Ahead of operating the machine, please read the manual and understand fully the details on its operation.
- Page 7 1-6) Position of “Caution” is attached to the machine for safety. Caution Mark In case of starting to run the machine, read the directions of “Cautions” carefully. [Position of Caution Mark] CAUTION 경 고 Do not operate without finger guard and safety devices.
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Page 8: Specification
Specification 1) Sewing machine Model No Model Name KM-757 High-speed, two needle, drop feed, needle feed, standard hook sewing machine KM-757-7S High-speed, two needle, drop feed, needle feed, standard hook sewing machine with automatic thread trimmer (Servo motor) KM-757-7N High-speed, two needle, drop feed, needle feed, standard hook sewing machine with automatic thread trimmer (470 motor) -
Page 9: Servo Motor
2) Servo motor MODEL VOLT WATT HERTZ SC55-1B 1 phase 110V 550W 50/60 Hz SC55-2B 1 phase 220V 550W 50/60 Hz SC55-3B 3 phase 220V 550W 50/60 Hz 3) 470 motor PM470 MODEL PHASE HERTZ VOLT 5 : 50Hz 1 : 1 1 : 110V 6 : 60Hz 5 : 50Hz... -
Page 10: Installation
Installation Caution ▶ Installation of the machine should be performed by a trained engineer. ▶ Any electrical wiring must be performed by a qualified technician or agent. ▶ The machine weighs over 42kg. At least 2 persons should carry out the installing work. ▶... -
Page 11: Oil Supply
(2) Lubricating the oil fan A. Fill the lubricant up to the “HIGH” mark. (See Figure 3.) B. The lubricant must be SUNSTAR’s oil provided exclusively for industrial sewing machines or SHELL’s Tellus C10. C. If the oil in use is down to the “LOW”mark, fill in to “HIGH”... -
Page 12: Adjustment Of Belt Tension
(4) For trial runs, operate the machine at 1,500 spm for about 10 minutes at a time. Be sure to check whether the oil window is being lubricated. (See Figure 5.) (5) Operate the machine at below 2,400 spm for the first 4-5 days and run the machine at normal speed thereafter to maintain the sewing machine in optimal condition. -
Page 13: Installation Of The Thread Stand
(3) Lastly, fasten the belt cover “B”to the table, as can be seen in Figure 9. [Figure 9] 7) Installation of the thread stand As can be seen in Figure 10, fix the thread stand ① to the table using the washer and nut on the right. ①... -
Page 14: Check For The Stop Position Of The Sewing Machine (Automatic Thread Trimmer)
(2) Adjustment of the location detector A. For Servo motor (in-built location detector) Adjust the up-stop position of the needle such that the white carved sign on the pulley ③ is in a straight line with the carved sign on the arm ④ when the needle has stopped in the air. That adjustment can be made by loosening the pulley’ s clamp screw①... -
Page 15: Reverse Button Function (Automatic Thread Trimmer)
10) Reverse button function (automatic thread trimmer) Pressing the back tack button or reverse button ① during forward sewing will start reverse sewing immediately. When you stop the machine and restart it by stepping down on the pedal with the reverse button ① already pressed down, you can perform reverse sewing from the beginning. -
Page 16: Adjustment Of The Machine
As in Figure 20, place the upper end of the needle closely adhered to the upper side of the stopper hole ②, with the needle groove ① facing inward. Fix the needle with a fixing screw③. KM-757 SERIES KM-797 SERIES [Figure 20] Caution ▶Turn off the power when adjusting the lower thread tension. -
Page 17: Winding The Lower Thread
The tension of the lower thread being wound around the bobbin becomes tighter if the nut ⑧ is turned clockwise and looser if turned counterclockwise. 4) Routing the lower thread [Applicable model] [Applicable models] KM-757 KM-797 KM-757BL KM-797BL KM-757-7S... -
Page 18: Inserting The Bobbin
5) Inserting the bobbin Stop the needle ① at the highest position. Following the Figure 24, insert the bobbin (where the thread is rolled onto) or the bobbin case ② into the hook ③. After laying down the bobbin holder ④, close the slide plates ⑤ on the right and left. [Figure 24] Caution ▶... -
Page 19: Adjusting The Thread Tension
7) Adjusting the thread tension The result of the needlework depends on the sewing conditions such as the sewing material, used thread and stitch length. So please adjust as desired. good sewing upper thread tension is strong while the lower thread tension is weak. - Page 20 (3) Adjusting the tension of thread take up lever spring A. Adjusting the thread take up stroke As in figure 28, loosen the stopper fastening screw ①, and turn the thread take up lever’ s spring stopper ② clockwise to make the stroke smaller and counter clockwise to make it bigger.
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Page 21: Adjusting The Height And Pressure Of The Presser Foot
Caution ▶ After disassembling and adjusting a safety device, always place it back to the original position and check whether it functions as intended. ▶ Use both hands when pushing the machine backward or returning it to the original position. Due to the weight of the machine, your hand can get stuck in the machine if you should slip. -
Page 22: Adjusting The Height Of The Feed Dog
757 Series [Figure 34] (2) Adjusting the timing of hook edge and needle center crossing A. First, set the stitch length of (DIAL) KM-757, 757-7, Hook 797, 797-7 types at 2.5mm and KM-757BL, 757BL-7, edge 797BL, 797BL-7 types at 3.5mm. Adjust the hook gear fastening screw ①... -
Page 23: Clearance Adjustment Between The Upper Side Of The Hook Stopper And The Upper Side Of Needle Plate Groove
C. Adjusting the distance between the needle and the hook edge Raise the needle from its lowest point so that the hook center meets the needle center. Like in Figure 37, when the lower shaft of the needle meets the balance point of the hook’ s needle guide plate ① (adjust the needle guide form), adjust the distance between the hook edge and the inner side of the needle groove to 0.05~0.1mm. -
Page 24: Operation Of Needle Bar (Left, Right) Stop (Km-797 Series)
14) Operation of needle bar (left, right) stop (KM-797 Series) 1. When stopping the left needle bar Place the needle bar trimming direction lever ① to the L (left) position. Stop 2. When stopping the right needle bar Place the needle bar trimming direction lever ① to the R (right) position. Stop 3. -
Page 25: Adjusting The Trimming Device
16) Adjusting the trimming device (1) Adjusting the trimmer driving part A. Fixing the position of trimming cam (See Figure 44.) a) Turn the pulley with hand to place the needle bar ⑥ at its lowest position. b) With the left side of the trimming cam ① softly Lowest attached to the right side of the lower shaft point... - Page 26 C. Fixing the position of the trimmer solenoid (ass’y) (See Figure 46.) a) When the whole trimmer shake linkage ① is in up position, that is, when it has come back to its Solenoid original position after finishing trimming, the Stroke distance ④...
- Page 27 (3) Adjusting movable and fixed knives A. Adjusting the position of movable knife-edge and hook stopper (See Figure 48.) a) When a movable knife ① passes the front side of the hook stopper ②, adjust the distance ④ to be within 0.05~2 mm range like part ③.
- Page 28 B. Adjusting movable and fixed knife (See Figure 49.) a) Like in Figure 49, adjust the position of the fixed knife ③ so that the fixed knife right side edge ② matches the movable knife inner side edge ①. b) The initial assembling position of the movable knife ④ is where the movable knife-edge protrudes about 3 mm from the edge of the fixed blade.
- Page 29 knife’ ’ s initial position (See Figure 50.) C. Final fixing of the movable The standard initial assembling position of the movable knife ① is where the movable knife-edge protrudes about 3mm ③ from the fixed blade edge ② when the trimming action is finished, that is, when the movable knife is in its initial stop position.
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Page 30: Replacing Movable Knife And Fixed Blade
(4) Checkpoints on the assembling status of other trimming devices A. Check the starting point of the movable knife when the trimming action takes place Operate trimming movement manually to check whether the thread take up lever is in the lowest or at least 2.5 mm raised level when the movable knife starts working, like in Figure 52. -
Page 31: Adjusting The Wiper
18) Adjusting the wiper about 0.3 mm about 0.3 mm about 0.3 mm [Figure 55] (1) Set the needle at the up-stop position. (at the needle position on the control after trimming) (2) Set the stitch length at dial “2” . (3) When pressing with hand as in the above picture, the wiper edge ①... -
Page 32: Replacing The Gauge Set For Needle Width
2. Remove the two needles 3. Disassemble the needle holder. (※ turn it towards the arrowed direction for removal: KM-757 series) 4. Lift the presser bar lifter to raise the presser foot 5. Remove the presser foot 6. Remove the needle plate 7. -
Page 33: Causes Of Trouble And Troubleshooting
Causes of Trouble and Troubleshooting 1) Sewing machine troubleshooting Symptom Checkpoints Root cause Corrective action Direction and height of Needle is inserted into wrong position Reinsert the needle correctly and push in needle to its highest level. Needle Needle is bent Change the needle Needle breaks Feed dog timing... - Page 34 Symptom Checkpoints Root cause Corrective action The gap between the The height and distance between the Readjust the movable knife setting movable knife and the movable knife and the hook do not match position hook Check the tension of Tension and contact of movable and Correct the tension adjustment and fixed knife fixed knives are bad...
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Page 35: Table Drawing
Table Drawing...