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3

Thread Tension Adjustment

The illustration at left shows sewing results with

correct tension settings. However, adjusting the

thread tension may be required depending on

the type of fabric and thread being used.

To begin with, select the stitch pattern key and

sew a test piece.

If the tension balance on the test piece is not

satisfactory, you can adjust the thread tension

manually,  as follows:

1  Press Manual key to select the manual thread

    tension display screen.

2  Press Thread tension keys to adjust the [+/- ]

    thread tensions manually.

Tighten left needle thread tension.

Tighten right needle thread tension.

1   Wrong side of fabric

2   Right side of fabric

3   Right needle thread

4   Left needle thread

5   Upper looper thread

6   Lower looper thread

7   Left needle thread tension

Correct tension

   The illustration shows sewing results when

   the left needle thread tension is too loose.

Wrong tension

Remedy:

Remedy:

1

2

4

5

6

8

7

2

1

3

4

5

6

1

2

3

4

5

6

7

8

Thread Tension (4 threads)

8   Right needle thread tension

Wrong tension

The illustration shows sewing results when

the right needle thread tension is too loose.

Summary of Contents for CompuLock

Page 1: ...INSTRUCTION BOOK CompuLock...

Page 2: ...ter for examination repair electrical or mechanical adjustment 4 Never operate the appliance with any air opening blocked Keep ventilation openings of the sewing machine and foot controller free from...

Page 3: ...Operation 11 Threading the Lower Looper 12 14 Threading the Upper Looper 15 16 Threading the Right Needle 17 18 How to Use Needle Threader 18 Threading the Left Needle 19 20 Threading the Double Chai...

Page 4: ...threads 43 Thread tension cover stitch 44 Thread tension double chain 45 To Adjust Stitch Length 46 To Adjust Differential Feed Ratio 46 To Deactivate the Upper Knife 47 To Activate the Upper Knife 47...

Page 5: ...ess adjusting knob 5 Up Down needle position key 6 Side cover 7 Looper cover 8 Handwheel 9 Power switch 10 Differential feed dial 11 Stitch length dial 12 Extension table A 13 Double chain looper 14 L...

Page 6: ...rewdriver small 8 Tweezers 9 Lint brush 10 Spanner wrench 11 Oil 12 Needle threader 13 Needle plate B for Cover Stitch 14 Presser foot B for Cover Stitch 15 Extension table B 1 2 3 4 5 6 7 8 9 10 11 1...

Page 7: ...neway If the plug does not fit fully in the outlet reverse the plug If it still does not fit contact a qualified electrician to install the proper outlet Do not modify the plug in anyway 1 8 Plug in t...

Page 8: ...open Push the side cover to the left To close Push the side cover to the right and slightly toward the machine body For Your Safety Always close both the side and looper covers when the machine is in...

Page 9: ...hile pushing with the thumb to the right as far as it will go pull looper cover toward you To close Lift looper cover and push against the machine The looper cover snaps into the position automaticall...

Page 10: ...l remove the spool holder from the spool pin Then place the spool with its slit side up and put a spool cap on top 2 If the thread slips down from the spool while threading or sewing put a net on the...

Page 11: ...Needle clamp screw for RF 12 Needle clamp screw for LF To remove a needle Disconnect the machine from the power supply Raise the needle to its highest posi tion Then loosen the needle clamp screw to...

Page 12: ...er or side cover is opened when you start sewing 2 Presser foot lifter is raised 3 The needle plate is not appropriate for the chosen stitch pattern 4 The upper looper setting dial is in the incorrect...

Page 13: ...p of the lower looper 3 Pull out 10 cm 4 of needle thread and draw it toward the back of the machine under the presser foot Now lower the presser foot and sew Incorrect threading will cause skipped st...

Page 14: ...ser foot lifter Place a spool of thread on the spool pin second from the right The points to thread for lower looper are marked in light green A convenient threading chart is placed on the machine bod...

Page 15: ...m the right side as illustrated 3 Hold the thread at both ends and tug gently to ensure the thread is correctly inserted in the thread tension unit 4 Pass the thread through the center of the looper t...

Page 16: ...and 5 as illustrated Holding the end of the thread push the lower looper thread guide 4 up with your other hand to return it to its original position as illustrated Lower looper thread guides 4 and 5...

Page 17: ...l pin The points to thread for the upper looper are marked in red A convenient threading chart is placed on the machine body inside the looper cover 1 Draw the thread through the center guide from bac...

Page 18: ...ooper thread guide 1 6 Pass the thread through the looper thread take up lever upper 7 Pass the thread through the upper looper thread guide 2 8 Holding the end of the thread with a pair of tweezers p...

Page 19: ...the spool pin second from the left The points to thread for the right needle are marked in green A convenient threading chart is placed on the machine body inside the looper cover 1 Draw the thread th...

Page 20: ...e eye of the needle 4 Push the pin through the needle eye forming a thread loop 5 Remove the threader and draw the loop towards the back of the needle Turn off the power switch before using the needle...

Page 21: ...pool of thread on the far left spool pin The points to thread for the left needle are marked in yellow A convenient threading chart is placed on the machine body inside the looper cover 1 Draw the thr...

Page 22: ...o ensure the thread is correctly inserted the thread tension unit 8 4 5 Pass the thread below the left needle thread guide then pull it up and over the left take up lever cover 6 Pass the thread throu...

Page 23: ...ouble chain looper are marked in orange A convenient threading chart is placed on the machine body inside the looper cover 1 2 1 Draw the thread through the rightmost thread guide from back to front 2...

Page 24: ...the handwheel toward you 5 4 Pass the thread through the right side of the looper thread guide 5 Pass the thread through the double chain looper thread guide 1 6 9 Pass the thread through points 6 th...

Page 25: ...nging to Two or Three Thread Serging with Spreader 1 Spreader 2 Upper looper 3 Holder If you want to do two or three thread serging with the spreader use one or two needle threads and the lower looper...

Page 26: ...can select the desired stitch by press ing one of the stitch pattern keys on the three pages 2 1 Page key 2 Stitch pattern key 3 Revert key 1 1 3 To Change Screen Language 1 To select the desired lan...

Page 27: ...the required machine settings for the selected stitch 10 1 When you select the desired stitch from stitch pattern keys the thread tensions will be auto matically set Settings such as the stitch length...

Page 28: ...6 FLATLOCK3 WIDE 7 FLATLOCK2 STANDARD 8 FLATLOCK2 WIDE 9 OVEREDGE 2 STANDARD 10 OVEREDGE 2 WIDE 11 COVERSTITCH 12 OVERLOCK 3 STANDARD 13 OVERLOCK 3 WIDE 14 ROLLED HEM 2 15 NARROW HEM 16 WRAPPED OVERLO...

Page 29: ...ERLOCK 2 STANDARD WRAPPED OVERLOCK 2 WIDE DOUBLE CHAIN REG REG FINE FINE REG REG REG REG REG REG REG REG FINE FINE FINE FINE FINE REG REG FINE FINE REG REG FINE REG REG FINE REG WOOLLY DECO DECO REG R...

Page 30: ...A A A A A A B A A A A A A A A A B S S S R S S S S S S R S S R R S S R S S R A A A A A A A A A A B A A A A A A A A A B YES YES YES YES YES YES YES YES STITCH PATTERN Stitch Pattern with Machine Settin...

Page 31: ...pe of fabric you re using Press OK key to memorize or press Return key to return to previous screen and cancel any changes 4 Press LAYERS key to register how many layers of fabric you re sewing Thread...

Page 32: ...ions changes depending on the type of stitch 3 The formerly memorized settings will be displayed 4 Press OK key to replace the previous settings with the new ones or press the Return key to cancel 2 3...

Page 33: ...he visual touch screen will indicate the correct needle setting Press information key to confirm the machine setting The sewing pattern and threading is illustrated as follows 1 OVERLOCK 4 Needle sett...

Page 34: ...edle setting position LB left back 4 OVEREDGE 2 STANDARD ROLLED HEM 2 FLATLOCK 2 STANDARD WRAPPED OVERLOCK2 STANDARD Needle setting position RB right back 5 OVEREDGE 2 WIDE FLATLOCK 2 WIDE WRAPPED OVE...

Page 35: ...eedle thread under the presser foot To begin with raise the presser foot and place the fabirc at the desired start position Lower the presser foot and start to sew To finish sewing stop the machine at...

Page 36: ...that the double chain looper thread comes out of the needle plate hole 7 Thread the right needle thread then place it under the presser foot together with the right needle thread and double chain loo...

Page 37: ...the left needle thread under the presser foot put a sewing test piece on the needle plate and lower the presser foot Turn the handwheel toward you to sew 2 to 3 stitches and pull the sewing test piece...

Page 38: ...m 5 while pulling the thread chain slightly to the back 4 Cut the threads with the thread cutter as illustrated leaving about a 5 cm 2 thread chain hanging from the end of the fabric Sewing Continuous...

Page 39: ...about 5 cm 2 long behind the needle 2 Put your fabric in the machine Then serge a few stitches and stop 3 Raise the presser foot and bring the thread chain to the left around and under the presser fo...

Page 40: ...n display screen 2 Press Thread tension keys to adjust the thread tensions manually Tighten left needle thread tension Tighten right needle thread tension 1 Wrong side of fabric 2 Right side of fabric...

Page 41: ...of fabric 2 Right side of fabric 3 Right needle thread 4 Left needle thread 5 Upper looper thread 6 Lower looper thread 9 Upper looper thread tension 10 Lower looper thread tension Wrong tension The...

Page 42: ...Right Needle thread tension 7 Upper looper thread tension 8 Lower looper thread tension The illustration shows sewing results when the upper looper thread tension is too tight and or lower looper thr...

Page 43: ...thread tension 1 Wrong side of fabric 2 Right side of fabric 3 Right needle thread 4 Upper looper thread 5 Lower looper thread 6 Manual thread tension display screen 7 Right needle thread tension 8 U...

Page 44: ...tension is too loose and or lower looper thread tension is too tight Remedy Tighten the upper looper thread tension and or loosen the lower looper thread tension Picot Edge Correct Tension The illust...

Page 45: ...fabric 3 Right needle thread 4 Lower looper thread 5 Right needle thread tension 6 Lower looper thread tension Wrong tension Wrong tension The illustration shows sewing results when the needle thread...

Page 46: ...ead tension is too loose Tighten right needle thread tension 1 Wrong side of fabric 2 Right side of fabric 3 Left needle thread 4 Right needle thread 5 Double chain looper thread 6 Left needle thread...

Page 47: ...t piece is not satisfactory you can adjust the thread ten sion manually as follows Correct tension 1 Wrong side of fabric 2 Right side of fabric 3 Left needle thread 4 Double chain looper thread 5 Lef...

Page 48: ...erential feed dial to adjust the feed ratio The number on the screen indicates the ratio between the main and the sub feed motion The differential feed ratio 1 0 indicates the neutral position The dif...

Page 49: ...ide until it comes to its lowest position 4 Close the looper and side covers 1 Upper knife release knob 2 Upper knife To Activate the Upper Knife 1 Turn off the power switch and unplug the machine 2 O...

Page 50: ...he cutting width adjusting dial to move the cutting blades to the desired position If the cutting width is too narrow turn the cutting width adjusting dial clockwise The lower knife will move right If...

Page 51: ...utting width adjusting dial to the right as far as it will go then move the chaining finger setting knob to the guide line S for Standard serging or R for Rolled hem Release the cutting width adjustin...

Page 52: ...older 3 Lever 4 Needle Attaching the Presser Foot Place the presser foot so that the pin on the foot lies just under the groove of the foot holder Lower the foot holder to lock the foot in place Raise...

Page 53: ...west positions deactivated replace the needle plate pressure foot and move the chaining finger to R position before attaching the extension table B Replacement of the extension table is required for t...

Page 54: ...nd tighten the set screw 1 Face plate 2 Light bulb 3 Holder Cleaning the Feed Dog 1 Open the looper and side covers 2 Remove the needles and presser foot 3 Move the chaining finger setting knob to R p...

Page 55: ...e upper knife reaches its highest position 4 Remove the hexagon bolt and the upper knife To attach 1 Insert a new upper knife into the groove of the knife holder Then tighten the hexagon bolt slightly...

Page 56: ...needle and or looper thread tensions are not correctly adjusted 2 The machine is not correctly threaded 3 The needle and or the thread are not suitable for the fabric being sewn 4 The thread is not co...

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