Question about Janome 1600P-DB Mechanical Sewing Machine

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Thread bunching? Did you end up figuring this out? Have the same problem and have tried all the adjustments suggested to stop the thread bunching up under the fabric. Feels hopeless. thx

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Ensure that all is clean and free of lint and jams, this is the most likely cause....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....

thread bunching? - 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 !

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 May 09, 2008

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1 Answer

Thread bunching on the bottom of My Excel 23X suggestions how to adjust


Try these suggestions
1. Change the needle--use a needle that's for the fabric being sewed
2. Rethread the machine--top --make sure to use every thread guide
3. try a different bobbin--make sure bobbin is inserted correctly into the bobbin case, & make sure the bobbin is turned the correct way in the bobbin case
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads

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STRING IS BUNCHING UP. NOT FEEDING RIGHT MAYBE


By string, I assume you meant thread ? Is it bunching up underneath the fabric you are sewing, or on top ?

If it bunches up underneath the fabric, the upper thread tension may not be right or the mechanism may be worn or need replacing. If it bunches up on top, thread guides may be catching or the needle may be damaged.

First thing, try a new needle. Damaged or dull needles can cause problems. Also try a new spool of thread, because sometimes a thread spool might have been damaged or is just bad quality. Some machines will not work well with very cheap, economy threads, so if you're using cheap thread, get better thread to try also.

Test stitch after each change you make to see if it's helped. The upper thread tension adjustment should work at any setting, but for normal sewing, should be at a middle setting.

If thread snarls up on top of the fabric, unthread the machine and check every thread guide for wear or nicks that might be catching thread.. needles can cause this also. May need to replace a guide if it's damaged, or perhaps use a file, emery cloth or sandpaper to smooth a rough spot. Rethread the machine with a new spool, set the upper tension to a medium level and try again.

If the thread bunches under the fabric, it's often the upper tension that's not right. Thorough cleaning of lint from the bobbin area should be done also, even a tiny bit of lint can be a problem in some machines. Try rethreading, try a new spool of thread, and a new needle.

If no setting on the upper tension produces a balanced, even stitch without bunching, the mechanism of the tension adjuster may be worn and need either professional adjustment or replacement.

Very rarely, you may find the bobbin tension might also need adjusting. Take out the bobbin case, you'll see the tension is controlled by a small spring which has a tiny slot screw on it. Mark the exact orientation of the screw slot now, [ marker pen or tape] so you can put it back where it was if need be. If you have to to a adjust it, you should move that screw only a tiny fraction of a turn at a time.

Check bobbin tension - pull out a foot of thread and hold the end of it , with the bobbin case dangling. Shake the case up/down like a child's toy YO YO. If the bobbin moves along in reasonably even increments with each jerk, it's likely ok. Or you can pull it along and see how hard it is to pull. If the bobbin case won't move or is hard to slide, it is too tight. If it slides on the thread freely it is too loose.

Usually. clockwise turns tightens the tension, but check to be sure. One tiny adjustment at a time, it gets a bit tedious. You have to put the bobbin back in and try a few stitches after each adjustment to see if the bunching is getting any better. If it makes no change or makes it worse, put the screw back to the original position.

If you are handy and can find a repair manual for the machine, you may be able to adjust the upper tension mechanism yourself, it should not need special tools. Often for older machines the hardest part is finding another part to replace the damaged one.

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I teach sewing. A student had a problem with bunched threads on the underside of the fabric. I have tried figuring it out and every so often the thread stops looping. While sewing on the cg550 singer...


Make sure you have the correct bobbin, 66 class. Check the bobbin case. These machines use the apollo bobbin case that tend to get broken and then the thread hangs up.

Apr 27, 2011 | Singer CG550 Mechanical Sewing Machine

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The bottom thread will bunch up occasionally, and stop the machine with thread hooked somewhere--probably around the bobbin.


Hmmm, does the thread bunch up under the fabric or in the bobbin?
Check both your tensions and if that doesn't work it could be that your machine is slightly off time and needs to be adjusted.

Aug 25, 2010 | Bernina Activa 130

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Hi, my thread gets caught and pulls the materal into the foot and i can not sew due to the jamming and the thread get all bunched up by the bobbin


I had similar problems when I first started sewing. Try adjusting the tension in your thread - less tension for lighter fabrics, more tension for heavier fabrics. This will stop the needle from pulling the threads in the fabric.

As for the thread getting bunched up in the bobbin - this is most likely because your bobbin is the wrong size for the machine, or that you did not thread the bobbin properly. Try re-threading, this time making sure you pull the thread into the bobbin container tightly. This should stop the bobbin from jumping around the container and spitting thread.

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Sewing a bunch of thread from the bottom, this stops the machine from actually sewing


Yes, it does. There are a couple of reasons the bobbin thread could be bunching up on the underside of the fabric. It could simply be that the machine needs cleaning. Take the bobbin assembly out, brush all the old lint out as best you can, reoil the machine once it's all clean, and make sure there aren't any little bits of thread caught in the bobbin assembly. Rethread the machine (carefully) and change the needle. This solves the problem usually--especially if the machine was sewing along fine and the problem develops suddenly. '
The other thing to check is your tension. It could be that the top tension is too loose. But different color thread in the top and in the bobbin, stitch a few inches (be sure to held the top and bobbin thread ends behind your needle as you start to stitch) and check. WIth the pressure foot down, adjust the tension, and stitch again. Keep stitching, checking, and adjusting until you see little if any bobbin thread on the top or top thread on the bobbin.
Another thing to reminder: use the appropriate thread and needle for the fabric you're sewing.
Let me know if this works, ok?

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Hi!

I think you are threading the top of the machine incorrectly. Make sure that what I'm saying is correct, use two color threads to sew with- and you will see that it is in fact the top thread that is bunching.

This might be a tension problem. Could be the bobbin is not threaded in the case right. First, check the threading of the bobbin and then check the stitch.

Next, adjust the tension on the bobbin case. There is usually a small screw on the case that can be tightened or loosened. I think you may need to adjust it a bit or adjust the top tension knob, just a small bit at a time. It the top does not change the stitch, then go to the bobbin case and adjust the screw to tighten the stitch a little bit more.

Please do rate this solution as FixYa and revert for further assistance.

Thanks
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