Merrylock MK740DSA, Instruction Book

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Page 2: ...of the sewing machine and foot control free from the accumulation of lint dust and loose cloth 5 Keep fingers away from all moving parts Special care is required around the sewing machine needle and cutter 6 Always use the proper stitch plate The wrong plate can cause the needle to break 7 Do not use bent needles 8 Do not pull or push fabric while stitching It may deflect the needle causing it to ...

Page 3: ...nded to avoid injury by expediently switch on the machine Always unplug the machine if you carry out maintenance oiling cleaning Don t use the machine if it s wet or in humid environment Never pull at the cord always unplug the machine by gripping the plug Never place anything on the pedal Never use the machine if the air vents are blocked keep the air vents of the machine and the foot pedal free ...

Page 4: ...avère nécessaire contactez votre Service Après Vente Manipulez le rhéostat avec précaution et évitez de le faire tomber Assurez vous que rien n est posé dessus Utilisez la plaque à aiguille adéquate Une plaque non conforme pe ut casser l aiguille N utilisez pas d aiguille tordue Lors de la couture éloignez vos doigts de toute pièce en mouvement et particulièrement de l aiguille Ne tirez et ne pous...

Page 5: ...OD 14 TITCHLENGTH S 15 STITCHWIDTHADJUSTMENTS idthadjustmentbychanging 1 W needleposition 2 Widthadjustmentwith adjustmentknob 5 7 8 8 8 9 9 9 9 10 10 10 10 11 11 12 12 13 14 16 17 19 19 20 20 20 16 SELECTIONOFSTITCHES 17 HANDYREFERENCECHART 18 SEWING CHAININGOFFANDTEST 19 FLATLOCKSEWING 1 Standardflatlockstitch 2 Ornamentalflatlockstitch 3 Ladderstitch 20 Differentialfeed 1 Stretchingeffect 2 Pus...

Page 6: ...cover 6 Cloth plate 7 Looper cover 8 Lower looper tension dial 9 Open thread guide 10 Retractable support rod 11 Thread guide plate 12 Spool holder pin 13 Anti vibration cone 14 Thread stand 15 Stitch length dial 16 Handwheel 17 Machine socket 18 Power light switch 1 DETAILSOFTHEMACHINE 9 10 12 13 14 15 16 17 18 7 6 5 1 2 3 4 8 11 ...

Page 7: ...19 Knife guard 20 Presser foot 21 Cloth plate 22 Stitch plate 23 Handle 24 Bulb cover 25 Presser foot lifter 26 Differential feed dial 27 Accessory box 28 Cutting width dial 23 24 19 20 21 22 25 26 27 28 ...

Page 8: ...le 3 Shirring Foot This foot is most suited for gathering when sewing tiered skirts yokes cuffs and frills on skirts etc This foot is also suited for sewing two fabrics together and gathering the bottom fabric in one operation 4 Pearl Sequin Foot This foot is used for sewing on beads etc 5 Piping Cording Foot This sewing foot is suited for sewing welting between two plies of fabric 6 Taping Foot T...

Page 9: ... type in this overlock Needle ELX705 size 14 90 is furnished with the machine Only use Needle ELX705 size 14 90 and 12 80 as supplied in the accessory case 5 PREPARATION PRIOR TO SEWING Connect the controller electric plug to the machine receptacle Plug power line into electric outlet Power Switch Push l mark side to turn ON Push O mark side to turn OFF To run the machine and control the speed pre...

Page 10: ...hen using household spools remove the anti vibration cones Place spool on spool holder pins and push the spool caps on If threads slip and get twisted cover the spools with the nets supplied in the accessory box 3 c Waste ollector Fabric waste will be collected as you sew Push the waste collector under the front of the machine and slightly to the left towards the cloth plate cover Anti spill net S...

Page 11: ...remain in the fabric A Overlock left needle B Overlock right needle Attention After removing the specific needle which is not currently to be used for sewing remember to fasten the set screw in the screw hole of the needle clamp and to just fasten tight into the hole Please do not over tighten the screw into the hole or the needle clamp will be damaged 3 To insert needles s Hold the needle with th...

Page 12: ...der the presser foot shank raise presser bar lifter to its High Lift position and while holding the presser bar lifter in this position remove the presser foot plate Replacement Place presser foot plate on throat plate under presser foot shank so that hinge pin C will fit inslot B of the shank Then lower presser bar lifter If presser foot plate can not be placed under presser foot shank easily rai...

Page 13: ... finger knob as far as it will go in the direction of setting R 12 THREADING THE MACHINE 1 Threading diagram Overlock Disconnect machine from electricity supply Support rod with thread guide must be fully raised Open the looper cover and the cloth plate cover Turn the handwheel towards you until needles are fully raised Thread the machine in the correct sequence Overlock 2 Tension color code 1 Upp...

Page 14: ...hread from back to the front through the thread guide 1 Thread the top cover thread guide by pulling the thread towards the left until it slips under guide Then pull thread along the right side of button as illustrated While holding thread with fingers pass it between the tension discs and pull thread down to make certain it is properly located in between the tension discs 3 2 3 4 5 6 7 1 1 2 2 3 ...

Page 15: ... looper Pull about 10cm 4 inches of thread through the looper and place to the back of the throat plate 2 Threading the Red lower looper Thread the lower looper as indicated 1 9 Raise Presser foot to release Tension discs Pass thread from back to the front through the thread guide 1 Thread the top cover thread guide by pulling the thread towards the left until it slips under guide Then pull thread...

Page 16: ... area of the machine following the red color coded thread guides 3 8 Note Use tweezers provided in the accessory case to aid in threading the looper Place the thread with the point of the tweezers slightly from left and to the right of threading guide 3 Thread the looper eye A from front to back Pull about 10cm 4 inches of thread Position thread into V cutout B on threader Firmly hold thread tail ...

Page 17: ...ont through the thread guide 1 Thread the top cover thread guide by pulling the thread towards the left until it slips under guide Then pull thread along the right side of button as illustrated While holding thread with finger pass it between the tension discs and pull thread down to make certain it is properly located in between the tension discs 3 3 1 1 2 2 2 3 4 5 6 7 8 9 3 ...

Page 18: ...eedle 9 Note Use of tweezers in the accessory case will make needle eye threading easy The position of the thread must be behind the thread guide Draw about 10cm 4 inches of thread through needle eye towards the rear of machine Place the thread to the back under the presser foot 4 Threading the threading the left needle Yellow A on needle clamp Thread the left needle as indicated 1 9 Raise Presser...

Page 19: ...n continue by slipping thread into the middle slot of the thread guides 7 and 8 Note For 4 thread overlock left needle Use neddle A Before threading eye of needle slip thread behind thread guide located on the bottom of the needle clamp Before threading eye of needle make sure thread is located on the bottom of in front of thread guide the needle clamp Thread the eye of the left needle 9 Note Use ...

Page 20: ...er foot to release Tension discs Pull the threads through the machine one at a time If threads do not pull easily check for tangles on thread guides or looping under thread stand When pulling thread through the needles STOP when the knot is in front of the needle Cut the thread and insert it through the needle 14 TITCH LENGTH S The stitch length can be adjusted from 1 to 4 mm Higher number longer ...

Page 21: ...osition Overlock seam width can be adjusted by changing the needle position a When using left needle 6 mm 15 64 inch b When only right needle is used 4 mm 10 64 inch 2 Width adjustment with adjustment knob Use of width adjustment knob will permit further adjustment within the width range shown below a When using left needle 5 7 mm 13 64 17 64 inch b When only right needle is used 3 5 mm 1 8 3 16 i...

Page 22: ...ed Edge 2 needle 4 thread stitch that is ideal for medium to heavyweight stretchy fabrics such as double knits and swim wear 1 needle 3 thread stitch is used for sewing narrow rolled hems 1 needle 3 thread stitch is used for butted or lapped seams and ornamental stitching with decorative thread Also a 4 mm and 6 mm flatlock width can be obtained by changing the needle position 1 needle 3 thread st...

Page 23: ... 4 mm overlock and a 6 mm wide overlock seams Also for overedging heavyweight fabrics the seam width can be increased still more by turning the overlock seam width adjustment knob Overlock width Needle used Needle thread tension dial 4 0MM 6 0MM Overlock right needle Blue Yellow Overlock left needle ...

Page 24: ...ntil the chain is 5 7 5 cm 2 3 inches in length Place fabric under the front of the presser foot and sew a test sample Note Do not pull on the fabric while sewing as this may deflect the needle causing it to break At the end of the sample continue to run the machine with the presser foot down until the chain reaches 15 20 cm 6 8 inches in length Note In case it is difficult to chain off when chain...

Page 25: ...pieces of fabric together to sew a decorative stitch on the right side of the garment Sew the seam trimming the excess fabric The needle thread will form a V on the underside of the fabric The lower looper thread will pull into a straight line at the fabric edge Unfold the fabric and pull on opposite sides of the seam to pull the stitches flat 2 Ornamental flatlock stitch Follow steps 1 3 above Fo...

Page 26: ...m puckering 2 Pushing effect To prevent waving or to gather select a number from N to 8 in the section This prevents waving or fluting in knits or puckers in fine woven fabrics It also can be used to gather single layers of fine woven fabric Note When sewing without differential feed the dial should be on position N 3 Gathering Use the differential feed to gather a single layer of fabric For examp...

Page 27: ...r thread appears on the top of the fabric Turn the lower looper thread tension dial red toward a higher number Or turn the upper looper thread tension dial green toward a lower number When the left needle thread tension is too loose Turn the needle thread tension dial yellow toward a higher number When the right needle thread tension is too loose Turn the right needle thread tension dial blue towa...

Page 28: ...ed to a lower number When the lower looper thread appears on the top of the fabric Turn the lower looper thread tension dial red toward a higher number Or turn the upper looper thread tension dial green to a lower number When the needle thread is too loose turn the needle tension dial yellow or blue to a higher number 2 3 Thread overlock Note These are suggested tension settings only NEEDLE POSITI...

Page 29: ...number Or turn the needle thread tension dial yellow or blue toward a lower number When the upper looper thread tension is too loose Turn the upper looper thread tension dial green toward a higher number Or turn the needle thread tension dial yellow or blue toward a lower number When the needle thread tension is too loose Turn the needle thread tension dial yellow or blue toward a higher number Or...

Page 30: ...er thread Needle thread Topside Underside 22 MACHINE MAINTENANCE An overlock machine requires more maintenance than a conventional machine for two reasons 1 A lot of lint is produced due to the cutting action of the knives 2 An overlock runs at a very high speed and needs to be oiled frequently to lubricate the internal working parts 1 Cleaning the machine Clean the lint from the looper and knife ...

Page 31: ...er cover and set the moveable upper cutter A in the working position Loosen the set screw B and remove the upper cutter A Turn the handwheel until the upper cutter holder is in its lowest position Place a new upper cutter in the groove of the upper cutter holder and tighten the set screw B Make sure the front edge of the movable upper cutter is 0 5 1 0 mm lower than the cutting edge of the station...

Page 32: ...ver screw and while pushing the cover lightly to the rear swing cover to the left and remove from machine as shown in the illustration Turn bulb to the left to remove To replace the bulb push bulb into the socket and turn to the right If voltage indicated on the electrical rating plate of your machine is 220 240V ask for light bulb conforming to following specification Edison type screw type 220 2...

Page 33: ... presser foot pressure for lightweight fabric Insert needle correctly Do not pull fabric while sewing Tighten needle set screw Use a larger needle on heavy fabrics Check threading Check for tangled or caught thread Insert needle correctly Insert new needle current needle may be bent or have a blunt point Use only high quality thread Loosen thread tension Stitch skip Balance thread tension Check fo...

Page 34: ...in Seersucker Satin Gabardine Broadcloth etc Cotton 60 80 Silk Rayon 50 Spun 60 80 Polyester 60 80 Heavy Weight Oxford Denim Tweed Serge Corduroy Cotton 40 60 Silk Rayon 40 60 Spun 60 80 Polyester 50 80 KNIT Spun 80 90 Polyester 60 80 Tricot Jersey Wool woven knit 12 80 14 90 12 80 14 90 12 80 Spun 60 80 Polyester 60 80 Cotton 60 80 14 90 12 80 Spun 60 80 Polyester 50 60 Woolly nylon Woolly Polyes...

Page 35: ...with integrated safety seam 1 needle 3 thread overlock 3 thread rollhem Needle system ELx705 Seam width 3 7mm Stitch length 1 4mm Presser foot lift max 6mm Handwheel rotates counter clockwise Sewing speed up to 1300 s p m Weight 6 6kg Dimensions 340Wx370Dx350H mm ...

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