Question about Juki MO-644 Mechanical Sewing Machine

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I have the Janome MO644D. The seam is extending far past the edge of the fabric with really big loops. It almost looks like a tension problem, but I've tried adjusting it, flossing the thread through the dials, and rethreading. Nothing is helping, and it almost looks like the feed dogs are pushing the edge of the fabric away, or eating at it. I always use basically the same fabric and settings so I am unsure what could have changed. Any suggestions?

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  • Juki Expert
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I have the Janome MO644D.  The seam is extending - s-l300-pupyr0ualaj20obfvyre1rzh-1-0.jpg I think the right 'finger' on the plate is out too far. You may need to adjust your cutting blades further to the right until your cutting blades are in line with the right finger on the plate. Sometimes I have forgotten that I set my cutting blades for a rolled hem and then went back to regular tensions and plate but forgot to adjust my blades back to regular serging.

Posted on Nov 06, 2017

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6 Suggested Answers

6ya6ya

6ya staff

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Posted on Jan 02, 2017

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radcal

  • 196 Answers

SOURCE: bobbin?

DO NOT RESET THE TIMING!! The timing is off on maybe 1 in 100 modern Husqvarna machines. For the user to change the timing is turning a simple fix into a complicated and expensive fix.
If the top thread is "looping up on the bottom" then you have a problem with the tension on the top thread. Here is what to check:
1. Thread the machine all the way through the eye of the needle. Don't go under the foot.
2. Pull the tread to the side. While pulling, lower the presser foot. You should see the needle bend as the thread gets tight. If not, you have no tension on the top thread.
3. With the bobbin in the case, hold the needle thread and turn the handwheel to bring the thread up. Watch through the cover to see if the thread passes over the bobbin from left to right. When it gets to the right side, the take up lever should pull the slack out and the thread should be pulled up. If it comes part way across but does not pull up, make sure the thread is in the take up lever. If you never see the thread, remove the bobbin case and turn the hand wheel. You should be able to see the hook pass behind the needle while the eye is still below the level of the hook. If the eye is above the hook as it passes the needle from right to left, then and only then consider timing the machine. If the hook passes above the eye but doesn't catch the thread (bobbin case out, needle plate on, presser foot down) you probably have a problem with your needle. Put in a new needle and make sure that the flat side is to the back.
99% of the time when a Husqvarna is not picking up the bobbin thread, something simple has been overlooked. Your symptom of looping on the back of the fabric indicate either a threading or tension issue in most cases, not timing.

Posted on Sep 14, 2008

Anonymous

SOURCE: thread breaking and terrible looping on backside of quilt.

I had same problem, the manual says to use left twist thread, it made difference, and thread made in germany is left twist

Posted on Sep 28, 2008

Zenqi

Paul Howell

  • 208 Answers

SOURCE: loops cross over on both sides - wavy pattern develops

Several things may be causing this.

First, make sure that the wire rack is DIRECTLY above the cones of thread (it may be backward). The thread must come straight up from the cone as it pulls off. Not coming straight up will cause a wavy stitch because of the thread dragging on one side of the cone.

Make sure that the threads are fully pulled into the tensioners, not riding on top of the discs.

Inspect the needle plate and ensure that the stitch forming pins and or fingers are intact.

Posted on Aug 18, 2009

Testimonial: "Thank you! I will take a look at all these suggestions...this is a big help."

Anonymous

  • 3 Answers

SOURCE: problem with thread tension.

Ok, please don't take this the wrong way, but I only mention it because this happened to me: are you sure you're threading the machine correctly? I've had mine for two years and finally realized the other day that I was passing the thread behind the tension disk when it should have been in FRONT of the tension disk. I didn't have tension problems all the time when it was misthreaded, which is why I guess I never realized I was doing it incorrectly. One other possibility: if the thread spool is vertical, trying standing it up (you may need to rig something with a coffee cup and some safety pins taped to the machine, but most machines provide both vertical and horizontal spool capabilities); if it's horizontal, try moving it to a vertical position. Some threads don't care which direction they are; others are VERY finicky about this.

Posted on Oct 01, 2009

Testimonial: "thanks, I did have it threaded wrong. It was the bobbin...I didn't have the thread under the spring."

Susan Ellen

  • 6 Answers

SOURCE: Feed Dogs on Janome 1600P

I recently purchased a Janome 1600P-DB and in order to do free motion quilting I had to cover the feed dogs with an index card. I also cut a small section out of the card to allow for the thread and needle to move freely. Standard tape was used.

Posted on Oct 21, 2009

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1 Answer

Janome one step Despite altering the tension dial the top thread is looping on underside of material and when pressing the reverse button material puckers.I tried adjusting the tension dial from 0-9


Usually, this occurs because the top thread is not fully seated in the tension disk.

Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread from the beginning.
Reset your top tension to the midway point and then tweak it.

What causes Bird Nests Superior Threads

Birds nest under the fabric big loops of thread top side looks good...

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1 Answer

How to fix tension? Janome 10000. Top thread looping on the bottom of the fabric.


Generally speaking, if there is thread looping on the bottom of the fabric the upper tension is incorrect or the tension disks are not engaged. Try completely untreading and re thread the machine with the pressure foot up. Then lower the pressure foot and see if you have tension when pulling gently on the thread. Try again.

Mar 07, 2015 | Janome Memory Craft 10000

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How do I set the tension on my JANOME 3434D serger?


Begin by setting all 4 dials on "3" which is the default setting on this model (often "5" on other machines). If a beginner, it would be best to thread the machine with four different colour threads according to the colours indicated on the tension dials (yellow, red, blue &green) so that it is easier to see how each thread responds as you adjust the dials. The two lower dials are for the loopers & must be adjusted until the upper & lower loops meet on the cut edge of the fabric - if below the edge: tighten the left dial & loosen the right dial (& visa-versa) just a fraction at a time. The two upper tension dials are for the needles: if too loose, loops form underneath the fabric below each needle, & if too tight the lower threads will show through to the upper side of your fabric where it is pierced by the needle. Good luck!

Jan 18, 2015 | Janome Sewing Machines

1 Answer

Advice on how do I adjust tension


I don't have a Janome, but in general
if your seam has extra loops at the top
looks like ^-^-^-^
loosen the upper tension a bit and tighten the bobbin tension a bit.

If the extra loops are at the bottom
sort of like \/-\/-\/-
do the opposite - tighten the upper tension a bit and loosen the bobbin tension a bit.

The upper tension is easy; it's usually a dial with +/- numbers. The bobbin may be more difficult. For mine, it's a screw on the side of the bobbin case. A web search seems to indicate Janome is the same.

Practice on scraps of the same weight and use the same thread you're using on your project until you get the tension right.

good luck

Oct 03, 2014 | Janome Sewing Machines

2 Answers

When zig-zagging on raw edge stitches bunch


Use a different stitch, use the triple zig zag or serpentine stitch so he needle is going through the fabric three or four times as it swings left to right.ma plain zigzag, because thread is tensioned, will pull lightweight fabric up. Try another raw edge finish, such as french seams, pinking shears or overcasting stitch. Of course for professional looking seams an overlocker (serger) is the answer as it has blades that trim the fabric edge and neaten with 2, 3 or 4 thread seam, encasing the raw edge.

Sep 26, 2014 | Elna 3210 Mechanical Sewing Machine

1 Answer

The top stich is loose on my Janome Harmony 8100, I have cleaned and changed bobbins, but nothing seems to help.


Ok, Let's understand exactly what is going on. You said. "the top stitch is loose." So that we are clear....do you mean that you are getting loops on top of the seam? Or do you mean that you are getting wiggly stitches on top and small loops on the bottom of the seam? It's important to know... Because loops underneath means the top tension isn't right. Maybe you didn't thread with the presser foot in the UP position... or your tension is dialed too low.

Now, if you are getting loops on top of the seam... that means the top tension is too tight. Loosen the top tension. Make sure your bobbin is inserted correctly. If loosening top tension isn't enough, you may have to tighten the tension screw on the bobbin case/ or bobbin carrier.

Feb 25, 2013 | Janome Memory Craft 9000 Computerized...

1 Answer

What are the settings for overlocking stretch fabrics


For knits with lycra in, you are best to thread up four threads and seam with the 4 thread marrowing stitch like this, preferabbly with ball point needles in your overlocker, size 80. Use cones of polyester thread, 3,000 metres or 5,000 metres rather than normal thread. (Although if you have trouble matching thread colours you can use a small reel on the left needle as this is the thread that will show on the right side of the garment.)

11_7_2011_5_17_44_am.jpg


Start with your machine tensions on 5, both needles in and threaded, stitch length of 2.5 and no differential (set it on zero) and test stitch. Using stretch or ballpoint needles is a good idea too to avoid any deflection and skipped stitches. Then practice serging on some fabric scraps, double layer and look at the seam, if it is tunnelling (pulling up the fabric), then move the cutting blade to the left. Test again and if still tunnelling, then loosen off the tension on the top and bottom loopers by a half number and test again.

If the opposite is happening and the threads are looping off the edge of the fabric, then move the cutting blade to the right to trim less fabric, test again. If still too loose, then tighten up the top and bottom looper tensions by a small amount and test again.

You want the seam to lie flat, the two looper threads to meet right on the cut edge and the needle thread to be just visible from the right side when you press open the seam.

There is always a small amount of adjustments needed on an overlocker when setting up for a new project as every fabric will behave differently. Don't tighten up the tension on the needles much past 5 though, or you may get thread breakage.

If you find that the seam is flutting then you can use the differential feed to adjust for this too.

There is some good overlocking info on Debbie Cosgroves website, www.sewing.about.com, with images which may help too.

Nov 07, 2011 | Janome MyLock 634D Mechanical Sewing...

1 Answer

My serger keeps rolling the edge as I serge. I've tried to make several adjustments. Where do you get instruction manuals. Is it online?


Possibly you need to adjust the knife. It sounds like the knife is positioned too far to the right which is causing the cut fabric to extend further than the edge of the stitching. The thread chain is probably so tight against the edge of the fabric that it is folding it over.Move the knife a little to the left and try it again. If the thread chain is hanging past the cut fabric then the knife was moved too far to the left.

Jul 05, 2011 | Janome MyLock 644D

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