Question about Janome 4623 Mechanical Sewing Machine

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Juki hzl 60 will not stitch. Had a jammed thread in the internal workings which I manage to extract. The bobbin casing kept jumping out of position. Put it all back together and now top thread and bottom thread do not appear to meet at all.

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Posted on Jan 02, 2017

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bargainbox
  • 1388 Answers

SOURCE: top thread accumulating in bobbin area and jamming

If you are using a standard top tension of 4 or 5 and this problem has developed over time, the most likely cause is lint deposited between the tension disks....... if the top tension is loose, or in the tension spring of the bobbin case if the bottom tension is having troubles. In either case you need to remove the lint...... 
Raise the presser foot and with a length of scrap fabric, use an action like flossing your teeth to get between the top tension disks......in extreme cases a probe (old needle) may be used very gently to remove thread and lint, but be VERY careful not to scratch the polished surfaces. 
I have also written a tutorial on tension balance which may be of further assistance, particularly for bobbin tension issues: 

Please TRY the solution BEFORE giving your considered rating.

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....

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 consistent diameter with good thread, and less compensating to be done by your tension plates and less thread breaks !
 
 
 
www.bargainbox.com.au

Posted on Nov 30, 2008

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  • 3 Answers

SOURCE: needle thread breaks while quilting on machine frame

I think you might have better luck if you use 40 or 50 weight thread.

Posted on Dec 20, 2008

  • 2 Answers

SOURCE: thread gets caught on bobbin and jams

You may need a new bobbin case if your machine is an older model.. Over time the cases get nicks in them causing thread to catch on it. Have you lubricated the bobbin area? Needs one drop of oil for every ,I believe it is 25 hours of usage. That may take care of it. The oil goes under the bobbin right in the center of bobbin case. Remove your bobbin before applying the oil. i hope this helps you. Good Luck

Posted on Jan 08, 2009

  • 5 Answers

SOURCE: Bobbin problems

Are you using a size "A" (Class 15) bobbin? If you are using pre-wounds and they are not this size... they will jump around alot. The size of an "L" is very similar, but they are not as tall (height off the table when laying flat on the round side... like when sitting in the bobbin case.) There are tricks to using the thinner bobbins... See if you have a "taller" size "A"/Class 15 and if that corrects the trouble. tjsews2008@gmail.com

Posted on Mar 02, 2009

sew dutch
  • 24 Answers

SOURCE: Juki HZL-E61: cannot get tension right on straight stitch

Loops on the bottom of the fabric direct the problem to the top thread. Rethread again and make sure the thread goes through the tension discs. Lift the foot, because this is what opens the discs. When sewing and the foot is down, the discs should be closed and thus giving the upper thread the tension it needs.

Posted on May 25, 2009

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1 Answer

My sewing machine is jammed how can i solve it


Loosen the needle, try to remove the presser foot. Then try to remove the bobbin case from the machine.

Otherwise, if it is jammed with a wad of thread, you can try using very small scissors and tweezers to remove the pieces of thread.

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Dec 01, 2015 | Juki HZLF300 Sewing Machine

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Juki.co.jp


Make sure you are threaded correctly. Also be sure that your bobbin is sitting in the casing correctly. If the timing is right and the hook is catching, the thread may not be pulling through correctly. Clean your machine as well. Make sure your tension spring is clean and doesn't need to be tuned up.

May 01, 2014 | Juki Sewing Machines

1 Answer

How do i stop juki ddl from top skipping stitches?


Hi. Skipped stitches are usually caused by a mismatch in your thread and needle. Wrong thread type, wrong needle size, or even old thread can cause skipped stitches. If all else fails, change the needle. If that doesn't work, clean the machine. Sometimes just getting rid of all the lint and giving her a good oiling does a world of good.

Let me know if this works.

Robbie

Jan 10, 2010 | Juki HZL-E80 Computerized Sewing Machine

1 Answer

Double needle use on Juki HZL-E80


if the machine regular needle threads front to back NOT side to side, you can use a double needle. simply pass both threads thru all the same slots (thread one at a time so they don't get twisted up) then just before the needles, leave one out of the thread guide just above the needle. you may have to loosen the top tension SLIGHTLY, like a half number. and do NOT use a zig zag stitch without first hand cranking it thru the cycle to be sure the needles clear, or you'll make a 5.00 mistake (the cost of the double needles!)

Jun 16, 2009 | Juki HZL-E80 Computerized Sewing Machine

1 Answer

Juki HZL-E61: cannot get tension right on straight stitch


Loops on the bottom of the fabric direct the problem to the top thread. Rethread again and make sure the thread goes through the tension discs. Lift the foot, because this is what opens the discs. When sewing and the foot is down, the discs should be closed and thus giving the upper thread the tension it needs.

May 25, 2009 | Juki HZL-E61 Computerized Sewing Machine

1 Answer

Thread continues to jam


Hi, my wife and I just bought a Juki HZL-E80... I love the machine. I had a problem like you discribe...This problem can come from two sources...one the bobin has been installed improperly. ...or been wound incorrectly by not haveing adjusted the Bobbin tension ...I did the tension adjustment with the screwdriver supplied with the machine accessories. Also...this is a biggie...the auto matic needle threader works great...but I discovered that when I preformed this function..that I over looked the thread holder that keeps the thread even with the needle....so, the solution is to thread the needle then be sure to check that the thread coming down from the spool is placed behind the little wire holder above the needle...I hope this helps you ...because it is a wonderful machine.....Bill & Donna Bramble...Caldwell Idaho...

May 15, 2009 | Juki HZL-E80 Computerized Sewing Machine

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