ZOJE ZJ2842-BD Скачать руководство пользователя страница 3 | Manualshive

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ZOJE ZJ2842-BD Скачать руководство пользователя страница 3

NOTES ONSAFETY

CAUTION

Environmental Requirements

Use the sewing maching in an area which
free from sources of strong electrical
noise such as high-frequency welders.
Sources of strong electrical noise may
cause prob-lems with correct operation.

Any fluctuations in the power supply
voltage should be within

1 0% of the

rated voltage for the maching, Voltage
fluctuations which are greater than this
may

cause

problems

with

correct

operation.

The power supply capactity should be
greater than the requirements for the
sewing machine s

electrical

consu-

mption, Insufficient

power supply

capacity may cause problems with
correct operation.

The pneumatic delivery capability should
be greater than the requirements for the
sewing machine s total air consumption.
Insufficient pneumatic delivery capability
may cause Problems

with correct

operation.

The ambient

temperature

should be

within the range of 5

to 35

during

use. Temperatures which are lower or
higher than this may cause problems with
correct operation.

The relatove humidity should be within the
range of 45% to 85% during use, and no
dew formation

should

occur in any

devices.

Excessively

dry

or humid

environments

and dew formation may

cause problems with correct operaton

Avoid exposure to direct sunlught during
Use. Exposure to direct sunlight may
cause problems with correct operation.

In the event of an electrical storm, turn
off the power and disconnect the power
cord form the wall outlet. Lightning may
cause problems with correct operation.

Sewing

Be sure to wear protective goggles when using the machine.
If goggles are not worn, there is the danger that if a needle breaks, parts of the broken
needle may enter your eyes and injure may result.

Thank you very much for buying a sewing machine. Before using your new maching, please

read the safety

instructionsand

the explanations

given in the instruction

manual.

With industrial sewing machines, it is normal to carry out work while positioned directly in front

of moving parts such as the needle and thread take-up lever, and consequently there is always a danger
of injury that can be caused by these parts. Follow the instructions from training personnel and
instructors regarding safe and correct operation before operating the machine so that you will know
how to uses it correctly.

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Содержание ZJ2842-BD

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Страница 3: ... the range of 45 to 85 during use and no dew formation should occur in any devices Excessively dry or humid environments and dew formation may cause problems with correct operaton Avoid exposure to direct sunlught during Use Exposure to direct sunlight may cause problems with correct operation In the event of an electrical storm turn off the power and disconnect the power cord form the wall outlet...

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Страница 5: ...t be done For example the symbol at left means you must make the ground connection Machine installation should only be carded out by a qualified technician Be sure to connect the ground If the ground connection is not secure you run the risk of receiving a serious electric Shock Contact you dealer or a qualified electrician for any electrical work that may need to be done The sewing machine weighs...

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Страница 7: ...hen handling the lubricating oil so that no oil gets into your eyes or onto your skin otherwise inflammation can result Furthermmore do not drink oil under any circumstances as it can cause vomiting and diarrhoea Keep the oil out of the reach of children Maintenance and inspection machine should only be carried out by a qualified technician Ask you dealer or a qualified electrician to carry out an...

Страница 8: ... Moving parts may cause injury Operate with safety devices Turn off main switch be fore threading changing bobbin and needle cleaning etc Moving parts may cause injury Operate with safety devices Turn off main switch be fore threading changing bobbin and needle cleaning etc Be sure to connect the ground If the ground connection is not secure you run the risk of receiving a seriois electric shock D...

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Страница 12: ...ber of stitches quick reference guide 26 7 SEWING 27 7 1 Sewing 27 7 2 Backtacking 27 8 THREAD TENSION 28 1 NAMES OF MAJOR PARTS 1 2 MACHINE SPECIFICATIONS 3 3 OPTINONAL PARTS 5 4 TABLE PROCESSING DIAGRAM 7 5 INSTALLATION 9 5 1 Installing the oil pan 10 5 2 Installing the machine head 11 5 3 Installing the knee lifter assembly 11 5 4 Installtion 13 5 5 Conexion de los cables 15 5 6 Installing the ...

Страница 13: ...g the rotary hook 56 12 2 Replacing the upper thread tension assembly 59 13 TROUBLESHOOTING GUIDE 61 8 1 Adjusting the thread tension 28 8 2 Adjusting the presser foor pressure 29 9 CLEANING 30 10 STANDARD ADJUSTMENTS 31 10 1 Adjusting of the feed dog height 31 10 3 Adjusting the thread tension spring 32 10 4 Adjusting the needle and rotary hook timing 34 10 4 1 Needle rotary hook point gap 34 10 ...

Страница 14: ...erse Stitching lever Sftitch length dial Needle plate Thread pillar Face plate Bobbin winder Machine pully Belt cover Reverse Stitching lever Sftitch length dial Needle plate Thread pillar Finger guard Thread take up cover Finger guard Thread take up cover ...

Страница 15: ...2 ...

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Страница 17: ...4 ...

Страница 18: ...or the rotary hooks in boxes Part code Part code Part code Part code Part code Part code Applicable model Applicable model Applicable model Applicable model Applicable model Applicable model He rotary hook point is reinforced to improve its durability This type is suitable for sewing materials that are hard to make loops on the surface like stretcht materials and that requiers making contact with ...

Страница 19: ...read tension spring typr Thread take up spring strength Thread take up spring strength B4 177B B4 177B A B4 177B B Standard Weak Very weak Very weak Double Standard part at time of shipment2842 2845 2872 and 2875 Standard part at time of shipment2842 2845 2872 and 2875 Reference Tension spring force when spring height 12mm Standard Approx 49N Approx 5kgf Weak Approx 17 64N Approx 1 8kgf Very weak ...

Страница 20: ... below A A 40 2 45 2 45 15 5 0 5 15 5 0 5 30 30 14 R 1 0 181 40 110 181 0 0 3 0 0 3 29 5 0 0 3 0 0 3 520 5 0 0 3 0 0 3 80 6 0 3 0 0 3 0 29 29 2 R10 2 R10 180 80 6 0 3 0 0 3 0 15 0 1 15 0 1 80 5 0 3 80 5 0 3 223 0 3 223 0 3 59 35 28 4 R20 4 R10 69 190 20 7 40 62 76 1200 181 R10 535 A A 35 35 174 174 A A 40 2 45 2 45 15 5 0 5 15 5 0 5 30 30 14 R 1 0 181 40 110 181 0 0 3 0 0 3 29 5 0 0 3 0 0 3 520 5 ...

Страница 21: ...8 Kg Kg ...

Страница 22: ... such as televisions radios or cordless telephones otherwise such equipment may be affected by electronic interference from the sewing machine The sewing machine should be plugged directly into an AC wall outlet Operation problems may result if extension cords are used Do not set up this sewing machine near other equipment such as televisions radios or cordless telephones otherwise such equipment ...

Страница 23: ...10 ...

Страница 24: ...lted back 1 Insert the knee lifter complying bar 2 Insert the two hinges into the holes in the machine bed 3 Clamp the hinges onto the rubber Cushions in the work table and then place the machine head onto the head cushions which are on top of the oil pan coners 4 Tap the pillow into the table hole Tap the pillow securely into the table hole If the pillow is not pushed in as faras it will go the m...

Страница 25: ...e when the knee lifter plate is fully pressed 8 After adjustment is completes securely tighten the nut 2 Loosen rge nut 3 Turn the screw to adjust so that the amount of play in the knee lifter is approximately 2mm when the knee lifter plate is gently pressed 4 Securely tighten the nut 5 Loosen the nut 6 Turn the screw until the distance between the end of the screw and the knee lifter is approxima...

Страница 26: ...13 1 Control box 2 bolts 5pcs 3 Spring washers 5pcs 4 Washers 5purchase 1 Control box 2 bolts 5pcs 3 Spring washers 5pcs 4 Washers 5purchase 5 Nut 6 Connecting rod 5 Nut 6 Connecting rod ...

Страница 27: ...14 1 Power switch 2 Screws 2pcs 1 Power switch 2 Screws 2pcs 1 2 2 1 2 2 1 Operation panel 2 Screws 2pcs Use for tightening rear cover 1 Operation panel 2 Screws 2pcs Use for tightening rear cover ...

Страница 28: ...15 ...

Страница 29: ...connected The machine may operate if the treadle is depressed by mistake which could result in injury Do not connect the power cord until all cords have been connected The machine may operate if the treadle is depressed by mistake which could result in injury Be sure to connect the ground If the ground connection is not secure you run a high risk of receiving a serious electric shock and problems ...

Страница 30: ...cable tie 1 otherwise may cause the cords to become disconnected which can cause problems with operation of the control box controles Bind the cords in such a way that the connector does not get pulled out All cords that come out from the control box should be secured to the cord holder 3 using the repeat cable tie 1 otherwise may cause the cords to become disconnected which can cause problems wit...

Страница 31: ...and also after long periods of nn use Use only the lubricating oil Nisseki Sewing Lube 10 spectified by ZOJE Minimum lubrication speciflcations Pour lubricating oil into the oil 1 about once every six mouths Semi dry specifications Pour lubricating oil into the oil cover 1 about as often as grease is applied 1 Tilt back the machine head 2 Pour lubricating oil into the oil cover 1 until the oil lev...

Страница 32: ...ng oil level drops below the bottom reference line 2 of the oil gauge window 1 be sure to add more oil 1 If the lubricating oil level drops below the bottom reference line 2 of the oil gauge window 1 be sure to add more oil ...

Страница 33: ...that the direction of the machine pulley matches the direction of the arrow If the direction of rotary is reversed change the direction of ratation to the correct to the corret direction while referring to the instruction manual for the motor 1 Turn the machine pulley to move the needle bar to its highest position 2 Loosen the screws hold the needles with their long groove facting inward insert th...

Страница 34: ...ng of the lower thread is completed the bobbin presser arm will return automatically If the thread cannot be wound on evenly loosen the screw and move the bobbin winder guide to the side where there is less thread Turn the adjustment screw to adjust the bobbin winding amount To increase the winding amount Tighten the screw To decrease the winding amount Loosen the screw Note The amount of thread w...

Страница 35: ...tion 3 Return the rotary hook latch to its original position 4 Turn the machine pulley to rotary the ratary hook until the tension spring is visible 5 Pass the thread throungh slit A in the rotary hook and then pass it at under through tension spring 6 Pull out the thread to a length of approximately 50mm 7 Close the slide plates 4 Turn the machine pulley to rotary the ratary hook until the tensio...

Страница 36: ... the cap into the rotary hook 5 Push latch of the rotary hook flat 6 Close the bed slide 1 Insert the bobbin into the cap so that the winding direction is as shown in the illustration 2 Thread the thread by one of the following methods in accordance with the shape of the cap being used 1 Pass the thread through slot A and under the tension spring 2 Pass the thread through slot B and C and then thr...

Страница 37: ... The position of the finger guard is adjustable Be sure to lower it once threading has been completed Pass the thread correctly between the tension discs Pass the thread correctly between the tension discs Cotton thread Cotton thread Arm thread guide Arm thread guide Synthetic thread Synthetic thread Felt Felt Arm thread guide Arm thread guide If synthetic thread is used use the felt included in t...

Страница 38: ...needle bar from moving otherwise damage to the machine may result NOTE If using this machine in place of a single needle machine remove the needle which is not being used In such cases do not use the procedures given below to stop the unused needle bar from moving otherwise damage to the machine may result NOTE 1000 Operate the stop lever after the needle has penetrated the material and has moving...

Страница 39: ... 8 4 0 3 7 3 0 4 8 4 0 3 7 3 0 4 4 3 5 2 9 2 5 2 2 4 4 3 5 2 9 2 5 2 2 4 6 3 4 2 7 2 3 2 0 1 7 4 6 3 4 2 7 2 3 2 0 1 7 3 5 2 8 2 2 1 9 1 6 3 5 2 8 2 2 1 9 1 6 4 6 3 0 2 3 1 8 1 5 4 6 3 0 2 3 1 8 1 5 3 8 2 5 1 9 1 5 1 3 3 8 2 5 1 9 1 5 1 3 3 2 2 1 1 6 1 3 3 2 2 1 1 6 1 3 2 7 1 8 1 3 2 7 1 8 1 3 2 7 1 5 2 7 1 5 1 8 1 2 1 8 1 2 1 5 1 1 No of stitches No of stitches Sewing angle Sewing angle R To stop...

Страница 40: ...e pulley by hand toward you until the lower threads come out onto the feed dog 2 Pull the lower threadds toward you and check that they pull out smoothly 3 Turn on the power switch 4 Depress the treadle to start sewing When the reverse stitching lever is pushed thecloth feed dirction will be reversed and when it is returned to its original position the feed direction will change back to normal Whe...

Страница 41: ...too strong or lower thread tension too weak Lower thread tension The tension of the lower lower thread varies with the kind of cloth and thread and can be adjusted by turning the lower thread tension adjustment Screw Lower thread tension The tension of the lower lower thread varies with the kind of cloth and thread and can be adjusted by turning the lower thread tension adjustment Screw Less tensi...

Страница 42: ...ed 1 Lower the presser foot 2 Adjust by turning the thread tension nut Upper thread tension After the lower thread tension has adjusted adjust the upper thread tension so that a good even stich is obtained 1 Lower the presser foot 2 Adjust by turning the thread tension nut Use Use Presser foot pressure Presser foot pressure Adjustment screw hight Adjustment screw hight For thin material For thin m...

Страница 43: ...aps from inside the rotary hook 5 Replace the bobbin or the cap The following cleaning operations should be carried out each day in order to maintain the performance of this machine and to ensure a long service life Furthermore if the sewing machine has not been used for along period of time carry out the following clearing procedures before using it again The following cleaning operations should ...

Страница 44: ...ate 4 Tighten the screw Lubrication 18 Lubrication the sewing machine according to the procedure on page 18 Lubrication 18 Lubrication the sewing machine according to the procedure on page 18 1 16 2 3 4 1 Check that the upper threads have been threaded correctly Refer to page 16 2 Check that the end of the needle is not broken If the end of the needle is broken the needle should be replaced 3 Lowe...

Страница 45: ...tighten the nut Refer to page28 0 147 0 343 15 35 1 2 3 4 1 2 3 0 147 0 343 15 35 1 2 3 4 1 2 3 2 1 5 3 4 6 7mm 0 147 0 343 15 35gl 1 5 6 7 Less Less More More Less Less More More 9 8 2 6 Thread take up spring tension The standard tension for thread take up spring L andthread take up spring R is 0 147 0 343N 15 35g for both spring Thread take up spring L 1 Open the face plate 2 Loosen the screw 3 ...

Страница 46: ...n the screws 1 2 3 Thread take up spring operation timing The standard operation take up spring L and thread take up spring R is the middle position within the operating range of the thread take up spring guide 1 Loosen the screw 2 Loosen the knob and then turn the left and right thread take up spring guided to adjust the tension 3 Tighten the screw and then tighten the knob 1 2 3 Thread take up s...

Страница 47: ...hten screw NOTE 8 7 9 1 2 3 5 1 3mm 4 6 3 0 05mm 5 1 Tilt back the machien head 2 Loosen screws 3 Move the ratary hook base to the left or right so that the clearance between the needke and the rotary hook tip is 1 3mm 4 then turn the adjusting screw 6 to adjust so that the clearnce between the needle and the ratary hook tip 3 is 0 05mm 5 Aftering adjusting securely tighten screws and 1 2 3 5 1 3m...

Страница 48: ...dle bar to its lowest position Reference line at the top of the needle bar must be aligned with the lower edge of the needle bar supporter at this time 4 Loosen the screw and move the needle bar up and down to adjust the height 5 Tighten the 8crew 6 Turn the machine pulley and check that the needle goes into the middle of the needle hole in the feed fog 2842 2872 1 2 3 4 5 6 2842 2872 Needle bar h...

Страница 49: ...ip must be 1 1 5mm when the rotary hook tip is aligned with the center of the needle 15 Install the feed dog 16 Install the needle plate 7 Remove the needle plate 8 Remove the feed dog 9 Set the stitch length to either 2 appros 2mm or 3 appros 3mm on the scale depending on the model and spectifications of the machine Refer to the table 10 Turn the machine pulley to raise the needle bar by Hmm from...

Страница 50: ...37 Stitch Length Stitch Length Needle bar height H Needle bar height H Insert the needle clamp all the way into the needle bar Insert the needle clamp all the way into the needle bar ...

Страница 51: ...ok tip is 10 After adjustment is completed insert the needle bar clamp into the hole of the needle bar 1 Remove the needle plate 2 Remove the feed dog 3 Set the stitch length to eighter 2 approx 2mm on 3 approx 3mm or the sclale depending on the model and specifications of the machine refer to the table 4 Turn the machine pulley to raise the needle bar by Hmm from its lowest position refer to the ...

Страница 52: ...39 ...

Страница 53: ...2 Remove the thread from all points from the thread take up to the needle 3 Remove the needle and the bobbin 4 Use the lifting lever to lift the presser foot 5 Turn on the power switch 6 Run the machine at the normal sewing speed for approximately 1minute without sewing any naterial foliowing the same start stop pattern as when actually sewing 7 Place the lubrication amount check sheet 2 to the le...

Страница 54: ...6 Check the position of the A mark on the machine pulley 7 Replace the belt cover 8 Install the needle 1 Remove the needle 2 Remove the belt cover 3 Tilt the machine head back and remove the timing belt 4 Turn the machine pulley until the A mark is aligned with the red dot 5 While holding the upper shaft so that it won t move align the mark in the lower belt pulley with the reference line in the a...

Страница 55: ...The adjustment is good if the amount of oil shown at left is scattered during approximately 10 seconds After turning the lubrication adjustment screw to adjust the lubrication amount operate the machine for 5 10 minutes before checking the lubrication amount 1 Remove the needle 2 Remove the bobbin or the cap 3 Turn on the power 4 Instrt a piece of white paper into the left side of the rotany hook ...

Страница 56: ... The adjustment is good if the amount of oil shown at lft is scattered during approximately 10 seconds After turning the lubrication adjustment screw to adjust the lubrication amount operate the machine for 5 10 minutes before checking the lubrication amount 1 Remove the needle 2 Remove the bobbin or the cap 3 Turn on the power 4 Instrt a piece of white paper into the left side of the rotany hook ...

Страница 57: ... 5mm to the Inside of the needle center lines Securely tighten the screw Asjuarinf the return position Stop the machine while needle bar is at its highest position Turn off the power switch Set the stitch length to 2 on the scale Adjusting the forward and back position Loosen the screws and move the solenoid up and down to adjust so that the tips of the thread wiper are 0 3 0 5mm forward of the th...

Страница 58: ...is too little the thread wiper may not be able to hook the threads depen ding on the kind of thread Set the thread wiper as close to the needles as possble provided that the threads will positively pass through the work Also check that the needle set screws will not contact the thread wiper Loosen the screw and turn the thread wiper supporter to adjust so that the cle arance between the tip of the...

Страница 59: ...and and then remove the needle plate 3 Remove the holed screws and remove the movable knife 4 Remove the screws and remove the fixed knife If the knives becone blunt sharpen the fixed knives as shown The noving knife cannot be sharpened with an ordivary whetstone If it becones blunt replace it with a new one If the knives becone blunt sharpen the fixed knives as shown The noving knife cannot be sh...

Страница 60: ...fe with your finger so that they are at the positions shown in the illustration 7 Tightcn the screw 11 1 Turn the machine pulley by hand untill the ooedres are pulled the way in the arrow direction 2 Lightly secure the moveble knife with screw Install the movable knife on the top of the bobbin thread clamp spring 3 Press down on the top of the movable knife and slide the movable knife Flrmly tight...

Страница 61: ...above and adjust with nut as necessary If adjustmcnt is not possible replace the tension release wire If the thread slips out of the needle hole after thread cutting or if the tension disc remain open adjust as follows A If the thread slips out of the needle hole The tension release lever is not working properly during thread cutting 1 Press the thread trimming solenoid and turn the sewing maching...

Страница 62: ... Adjustment method 1 Turn the machine pulley until the A mark is in line with the red dot 2 Turn the glisten parcel until the guild light is turned on 3 Turn the glisten parcel a little make sure the A mark is in line with the red dot when the needle is up stop position 1 Turn on the power 2 Stop the machine while the needle bar is at its hightest position 3 The pulley reference line should be vis...

Страница 63: ...e sure the gap from the top of the needle plate to the bosom of the needle clamp is approximately 16mm 1 Turn the power on 2 Press the treadle and then release the treadle to neutral 3 Make sure the gap from the top of the needle plate to the bosom of the needle clamp is approximately 16mm ...

Страница 64: ...ark on the machine pulley scale must be in line with the red dot on the machine head The permissible deviation of the T mark from the center of the red dot is 2mm 1 Remove the timming belt 2 Turn the machine pulley until the T mark is in line with the red dot 3 With the thread trimming solenoid depressed turnn the lower belt wheel in the arrow direction until it is hard to turn 4 Keep the machine ...

Страница 65: ...6 Remove the presser foot 7 Remove the needle p ate 8 Remove the feet dog 9 Tilt back the machine head 1 Turn the machine pulley to move theneedle bar to its highest position 2 Remove the needle 3 Remove the slide plate 4 Remove the needle calmp 5 Raise the presser foot by using the presser foot lifter 6 Remove the presser foot 7 Remove the needle p ate 8 Remove the feet dog 9 Tilt back the machin...

Страница 66: ...ft A A B B C C 1 Attach the needle clamp 2 Attach the needle 3 Attach the feed dog 2842 2845 1 Turn the machine pulley and check hat the needle goes into the middle of the needle hole in the feed dog 2 Loosen and align the needles so that the needles will fall in the centers of the needle holes in the feed dog 1 Attach the needle clamp 2 Attach the needle 3 Attach the feed dog 2842 2845 1 Turn the...

Страница 67: ...hat the clearance between the needle and the rotary hook tip is 0 05mm After adjusting securely tighten screws and 4 Check the needle bar height Turn the machine pulley to move the needle bar the its lowest position and adjust so that reference line is aligned as shown in the machine head 5 Tilt back the machine head 6 Adjust the clearance between the needle and the rotary hook tip 1 Loosen screws...

Страница 68: ...position 9 Attach the needle plate 10 Attach the presser foot 7 adjust the needle bar lift amount 1 Set the stitch length to eight 2 approx 2 mm or 3 approx3ram on the scale depending on the model and specifications of the machine Refer to the table on pages 33and34 2 turn the machine pulley to move the neelde ar to its lowest position and adjust so that reference line b is aligned as shown in the...

Страница 69: ...ws 12 Turn the machine pulley to move the needle bar to its highest position 13 Remove the rotary hook 1 2 3 4 5 6 7 8 9 10 11 12 13 1 Turn the machine pulley to move the needle bar to its highest position 2 Remove the needle 3 Remove the slide plates 4 Raise the presser foot with the presser foot lifter 5 Remove the needle foot 6 Remove the needle plate 7 Remove the feed dog 8 Remove the opener 9...

Страница 70: ...oo high tighten all three screws less than fully and then turn them all again to tighten them fully NOTE 1 2 3 34 b 1 Insert the new rotary hook into the mounting hole 2 Install the needles 3 While refering to pages 34 adjust so that the rotary hook tip is aligned with the center of the needle when the needle bar is raised from ist lowest poaltionI until reference line at the botton of the needle ...

Страница 71: ...nd the opener is 0 2mm when the opener is pulled as far as it will go in the direction of the arrow 12 Tighten the set screw 13 Install the slide plates 14 Add 1 2 drops of oil to the left and right rotary hook races 15 Adjust the rotary hook Iubrication amount while referdng to page 39 9 Loosen the set screws and move the rotary hook up and down to adjust so that the clearance between the matary ...

Страница 72: ...ust the tension of the thread take up spdng Refer to page32 3 Tighten the screw 4 Close the face plate 1 2 3 1 2 32 3 4 1 Openthefaceplate 2 Loosen the screw 3 Loosen the screw and then remove the upper thread tension assembly 1 Install the new upper thread tension assembly and tighten it with the screw 2 Adjust the tension of the thread take up spdng Refer to page32 3 Tighten the screw 4 Close th...

Страница 73: ...60 22 24 14 22 24 14 1 1 2 2 3 3 8 13 13 16 11 23 22 13 13 16 11 23 22 ...

Страница 74: ...ce the needle Is the needle properly installed If it is incorrect install the needle correctly Is the machine properly threader If it is incorrect thread the thread correctly Is the rotary hook properly Iubricated If the oil level is below the lower reference line in the oil sight glass add more oil Is dust or thread in the rotary hook Clean the rotary hook Is the upper thread tension too strong o...

Страница 75: ...62 2842 2872 2842 2872 4 4 5 5 6 6 2 6 2 6 13 13 16 21 2 5 13 13 16 21 2 5 32 16 25 20 21 16 25 20 21 ...

Страница 76: ...perly threaded If it is incorrect thread the thread correctly Is the thread take up spring operationg range too small Adjust the operationg range of the thread take up spring Is the needle thread tension and bobbin thread tension too low Adjust the upper and lower thread tension Is the bobbin scratched If the bobbin is damaged smooth it with an oiled grindstone or replace it Is the machine properl...

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