Question about Juki DNU-1541 Mechanical Sewing Machine

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Adjusting bobbin tension.

I am attemting to sew ultra suede. My tension on my bobbins once I insert it into the casing is so tight I can hardly pull it. When I start sewing it starts pulling and bunching up my material. It is not a nice flat surface. Please help me.

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  • Patti Lemaire Oct 15, 2012

    I am using Gutterman Thread.. very expensive and 100% cottoin. I have to use cotton thread no choice. The thread keeps getting stuck in the front tension disk. Do you have any other suggestions. All of the above was excellentt..you should write the manuel.. we need a good one... lol. Thank You.. Love Light and Gratitude, Patti the new commer to industrial machines.. and it is a challenge. Looking for a easy manuel that is available to understand y

  • Patti Lemaire Oct 15, 2012

    What about the thread?

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  • Juki Master
  • 1,388 Answers

This generic tension setting guide will walk you through attaining the correct balance of tension for any machine.

.........................................................................................


Ensure that all is clean and free of lint jams....now for tension troubleshooting .......

This solution is for tension problems...if you cannot form any sort of stitch, the issue is quite different, so please let me know if you need a different problem solved.....

It is quite long, but just work through each section in order.
The "knotting up" can reveal a lot. If you have loose threads on one side or the other, the tension on the opposite side will be the culprit.

QUICK SUMMARY FIRST:
Ensure sharp new needle,
Thread guides and Bobbin are Clean & Clear of lint
Set Top Tesion to 4 ....then....
Balance Bobbin to suit.

TOP THREAD TENSION:
If the looping threads are on the underside as you sew, it is the top tension. Top tension ought to be between 4 & 6 (this variation to allow for the different weights of fabric in your
projects).

IS YOUR NEEDLE SHARP ?
If you are using a needle that has seen quite a deal of work, or you suspect it may be blunt, change it for a new one !

TOP TENSION & GUIDES:
Make sure that when you thread the machine the presser foot is up so the thread goes between the discs and not to one side, top tension between 4 and 6, and that you have threaded through all the guides, including the last one, usually on the needle arm, just above the needle clamp.

It may be there is lint trapped between the discs, this will keep them slightly apart and reduce the actual tension, sometimes dramatically.

If tensions appear correct, and the thread is definitely in the channel between the discs, but still too loose and looping, try raising presser foot and remove your thread.

Now, with a 2" (50mm) wide strip piece of fabric 8 - 10" (20 - 25cm) moistened with methylated or denatured spirit, gently insert the fabric strip and clean between the discs with
a see saw / to and fro action.

In the worst cases, gentle use of a needle to pick & remove the jam may be necessary, but be very gentle and make sure the tension is set at Zero and the presser foot is raised, (to
disengage tension plates).... do not gouge or score the plates, they need a polished surface to work correctly.

BOBBIN TENSION:
Far less common, but if the loose threads are on the top, it is bobbin tension that is loose, it too may have lint in the spring and be giving a "false" tension.

I would not recommend fiddling with bobbin tension without good reason, it may end up with missing small screws and spring pieces, however, you can take the needle plate off to clean
the hook race area (where bobbin case sits)

...this is just good housekeeping, my wife does this every time she replaces the bobbin....

just take it out and clean the bobbin case and the fixed metal hook race with a small brush to remove lint. If there is a significant amount of lint, use a vacuum and small brush to get the worst.

Then wipe all this area with a cloth or cotton bud (Q tip) moistened (not soaked) with methylated spirit, especially if there appears to be fine dirty deposits....oil and lint combine to conspire against you.

If it seems likely that you ......really ....do .....actually .....need .....to adjust the bobbin case, first check there is no lint trapped in the metal spring where the thread is tensioned.

TOP LOADER:
Drop-in Bobbin case will look similar to this image with the tension screw in the middle of the metalwork....

Adjusting bobbin tension. - 4c76dc1.jpg ...the other screw at one end is holding it all together, so beware....it is not a tragedy to undo the whole lot and clean it, but very gingerly and lay the bits out in sequence and orientation, or you risk tearing your hair out !

FRONT LOADER:
....this is a bobbin case from a front loading machine and works in a very similar fashion to the top loader with drop in bobbin, again, if you dismantle it, take care so you can put it all
back properly.
165ca5c.jpg FINISHING UP
GETTING THE BALANCE RIGHT:
When you are certain there's no trapped lint in top tension or bobbin, set the top tension to 4 and the bobbin tension to a point where you just begin to feel resistance.

Try using good quality thread of contrasting colours so you can more easily spot the changes.

Set your zigzag to one width less than maximum (eg. 5 of 6 ...or... 4 of 5 etc) and sew a sample for a few inches and check the result.... adjust the bobbin tension screw very little at
a time, perhaps 1/16 of a turn.

You may find you are playing with this balance for some little while and if you are putting the needleplate on and off each time begin to think it cannot be correct to do this.....BUT....it is,
and eventually, you do get a "feel" for the correct tension and then it happens quite quickly.....as a user you won't be doing it very often unless there is lint built up (or are there small hands at work around the house !?!?!)

OTHER ISSUES:
If you live near the ocean as we do, salt air can play havoc with metalwork inside and out, so to help minimise this, keep a few small packets of dessicant (silica gel) in your machine
case....no case ? then make some sort of cover !

Same applies in any damp or humid environment, keep your machine dry and dust free.

Budget for a proper full service every couple of years (more often if heavily used) and if you don't use your machine for a few years, be aware that old oil will dry out and combining with
dust and form a "clag" like glue (another reason for some sort of cover, even a teatowel !)

FINALLY, A WORD ON THREAD:
If it is worth spending the time, energy and money on making something that you would like to give lasting enjoyment......use quality thread, .......it may seem to cost a little more at the
time, but the results, ease of use and added longevity will be worth the extra, and as a bonus, your tension troubles may be fewer and further between, because there is a more consistant diameter with good thread, and less compensating to be done by your tension plates and less thread breaks !

If you want any more help with this, just post back here, or, drop a line through the "Contact Us" page at www.bargainbox.com.au

Posted on Jun 09, 2008

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Try sewing but bottom thread on fabric is crumpING UP


needle thread tension is not adjusted up properly tighten the setting until you have resistance when you pull the thread to thread the needle

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How to adjust bobbin case for proper movement.


  1. Using a doubled piece of fabric similar to what you have in mind for your project, sew a seam on the diagonal-pulling the fabric on the diagonal to break the threads. (Ideal tension would either break neither thread or break both threads. So, a single breaking thread signals that the tension needs adjusting.)
  2. Snap out the faceplate to remove it & to gain access the bobbin area below the sewing needle.
  3. Remove the bobbin case & bobbin-lifting the hinged latch that you would to wind a new bobbin-leaving the bobbin in the case. (You need it in there to feel the tension as you adjust it.)
  4. Using a small screwdriver, very slightly turn the screw on the side of the bobbin case clockwise to increase tension; counterclockwise to decrease tension.
  5. Pull the bobbin thread while you hold the bobbin in its case & feel the thread's tension. Too tight of tension would prevent the thread from dispensing (& possibly break), but too loose of tension would allow the bobbin to fall out of its case.
  6. Return the bobbin case to the sewing machine & close the faceplate.
  7. Repeat this whole routine from Step One on the doubled fabric. Stitching should run along both the top & the bottom in the same way-locking in the center. A diagonal pull of the fabric should show which thread(s) break(s). Repeat Steps Two through Four to only adjust the screw aside the bobbin case in order to allow the threads to lock in the center of the fabric with both threads having the same break or no-break result.
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How to thread a bobbin


Hold the bobbin case in your left hand, with your right hand, insert the bobbin with the thread unwinding from the right. Pull the thread through the small slot in the top of the bobbin case, then hold the bobbin tight and pull the thread under the bobbin case tension spring ( a flat piece of metal). When you pull the thread out, there should be some tension on the thread and the bobbin should unwind counter clockwise. If there is no tension on the thread, it's not under the tension spring on the case. If the bobbin turns the wrong way, remove it and turn it around, and put it back in.

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Why does the thread break on my sewing machine?


The top thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
8. Try a different spool or cone of thread
Bobbin thread breaks
1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly
2. Lint has collected in the bobbin holder
3. The bobbin is damaged & doesn't turn smoothly
4. Lower thread tension is two tight


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Why does the thread break once you start sewing?


The top thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
8. Try a different spool or cone of thread

Bobbin thread breaks
1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly
2. Lint has collected in the bobbin holder
3. The bobbin is damaged & doesn't turn smoothly
4. Lower thread tension is two tight

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What to do when the thread keeps breaking


The top thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
8. Try a different spool or cone of thread
Bobbin thread breaks
1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly
2. Lint has collected in the bobbin holder
3. The bobbin is damaged & doesn't turn smoothly
4. Lower thread tension is two tight




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Thread keeps breaking


The top thread breaks

1. the needle thread is not threaded properly

2. The needle thread tension is to tight

3. The needle is bent or blunt

4. The needle is incorrectly inserted

5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew

6. the threads were not drawn to the rear after sewing

7. The thread is either to heavy or to fine for the needle

8. Try a different spool or cone of thread

Bobbin thread breaks


1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly


2. Lint has collected in the bobbin holder


3. The bobbin is damaged & doesn't turn smoothly


4. Lower thread tension is two tight

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Bobbin thread breaks
1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly
2. Lint has collected in the bobbin holder
3. The bobbin is damaged & doesn't turn smoothly
4. Lower thread tension is two tight

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Thread breaking


The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle


Bobbin thread breaks

1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly

2. Lint has collected in the bobbin holder

3. The bobbin is damaged & doesn't turn smoothly

4. Lower thread tension is two tight

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I have a EURO -PRO model 9110. The bobbin tension is not correct.The top thread can be easily pulled out after sewing.How do I adjust the bobbin tension?


Hi janna

have you tried adjusting the top tension first?
if you have a drop in bobbin then it has to be adjusted at a sewing shop
the bobbin case you take out of the machine you can, using a small screw driver,,here's how
lower bobbin tension--
to test the bobbin tension,
remove the bobbin case & bobbin,,
hold it by suspending it by the thread,,
**** it once or twice,,
if the tension is correct, the thread will unwind by about an inch or two
if the tension is too tight, it does not unwind at all
if the tension is too loose, it will drop too much
to adjust turn small screw on the side of the bobbin
to the left is tighten
to the right is loosen

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