Thread continually breaking in lower looper needle
Lower looper thread continually breaks. I have had this overlocker for some time now and have used it successfully on all fabrics, I have tried to thread,just the lower looper needle, both the looper needles and all the needles in order but no success, it makes just 2 or 3 stitches then the same thread breaks. Please help I am now getting quite desperate over such a simple thing.
Re: thread continually breaking in lower looper needle
I was having this very same problem with my lower looper . I had been using the one needle stitching all afternoon and I was doing quite nice stitching. then I decided to put the right needle back in and do some overlock stitching and guess what I spent the next two hours fighting the looper problem. I had completely re-thread this machine at least 20 times now. I decided to take the needle out and re-insert it and re-thread it one more time (right lower looper- then upper looper- right needle- then left needle) was careful to pull all threads to the back and under the presser foot for about 6 inches.
Held on to the thread, lowered presser foot and did the chaining stitch. BINGO it didn't break, tried it with a piece of cloth and Perfect stitches. I have a Babylock BL402 and used tension settings left to right
4-3-3-3 and default settings for the rest.
Hope this helps someone someday.
sometimes the needle plate gets a burr on it which will break the thread when sewing. Usually 2 screws hold the needle plate on and remove those and pull the needle plate off. Take a close look at the hole that the needle travels into and see if its a little rough on both side. If so you can use a file on it to smooth it back down.
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Thread breakage is usually an indication that the machine is not threaded correctly or the tension is set too tight.
As a reminder, if a thread breaks, save yourself some (lots!) frustration and rethread every thread From The Beginning. Rethreading only the broken thread will usually just lead to it breaking again. Sergers are finicky and must be threaded in the correct order. Also, Always raise the presser foot while threading. Your thread breakage is occurring with the lower looper. Be sure that you are threading every guide and give it a little tug going through the tension disk. Usually, the last step is to drape the lower looper thread over the top of the upper looper before it is pulled back and under the presser foot. Be sure to initially set the tension at the midway point between the high & low numbers.
The 335 has a two thread chain stitch (stitch type 401), and the overlock side (right needle side), is a three thread plain overlock. If you are describing the plain overlock as the problem, I would first suggest the following in re-threading:
1. Thread the upper looper
2. Thread the lower looper
3. Thread the needle last (important)
If the needle threaded, you cannot re-thread the lower looper without breaking the thread.
In order to thread the lower looper, the lower looper must pass by the needle thus picking up the needle thread. So, instead of threading the lower looper thread underneath the needle thread, the looper would be threaded on top and cannot sew without breaking the thread.
Make sure that the threads are bedded between the tension disks. Check this by stretching the thread fore and aft of the tension disks as well as visually noting that the threads are not accidentally threaded behind the disks. You can also loosen the tension disks when threading so as to allow the threads to bed deeply between the disks.
Please reply with your observations.
Please re thread machine from scratch threading upper looper first then lower looper then needles also be sure needles are in with the flat back to the back of machine sequence of threading is imperative
If it's the lower looper thread breaking, the cure is to unthread the eye of the needle(s), rethread the lower looper, then rethread the needles. Sergers have very specific internal crossings that are easiest to do if the various parts are threaded in a particular order. Typically, you thread the upper looper, then lower looper, then the needles. If you try to deviate from that without knowing exactly what you're doing, it tends not to work well.
In general, most serger troubles, especially for beginners, trace to minor misthreadings. It's easier, in my opinion, to rethread the entire machine from scratch than look for the minor error that's catching you up. And you learn the threading pattern well as a special bonus. <g>
If it's not cureable by rethreading a couple of times from scratch, the next thing to do is put in new needles, right way around, and rethread again.
Many things can cause the thread to break on a serger. Timing, position of the thread guides, poor thread, and improper tension. One common error is the failure to thread it in the proper order. If the needle are threaded before the lower looper they will cut your looper thread.
Overlockers and or Sergers are ALWAYS threaded the same way. Upper looper, Lower looper, right needle, left needle. If you have a model number for your Juki we might be able to find you more information.
The best way to figure out tension problems is to thread each thread in a different color so you can determine which thread is giving you problems.
These machines can be frustrating and EVERY time the thread breaks you MUST start the threading problem from the beginning... upper looper, lower looper, right needle left needle.
Then it's one of two things. First try setting your lower looper tension on 3 and see if that works. If not set it back on 4 and cut ALL your threads and re-thread the machine STARTING with the UPPER looper, then the lower looper, then the right needle, last the left needle if you're sewing a 4 thread overlock stitch. Make sure the threads aren't twisted in the thread guide. Make sure the lower looper thread is OVER the elbow on the upper looper and over the upper looper thread. Let me know if this works. We'll work until we get it fixed!
Hi,...if the lower looper thread is breaking before you sew six inches or more then I suspect a threading problem.When the lower looper thread breaks, You MUST unthread the needles before you thread the lower looper. Thread the looper and then rethread the needles.
One of the most common mistakes with overlockers is that the threads must always be threaded in order. So if you sew about 1 inch and the thread breaks try unthreading the eyes of the needles rethread the looper and then rethread the eyes of thew needles. If not you will get the same result of sewing about 1 inch and it will break again.