Check to make sure it is not wraping around the upper looper. just stitch without the material and you will see it. but then you must rethread the upper looper and the lower looper again in the right order. hope this helps
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Sergers are absolute "bears" when threading compared to sewing machines. If/when you get frustrated, walk away. It took me the majority of one day before successfully getting my first serger threaded properly. Using four different color threads is also helpful when learning the serger--especially when it comes to adjusting the tension.
It is very important to pay attention to the order the threads are threaded, as well as making sure the thread path for each is correct. (Consult your owner's manual as different brands will look different.) Most machines require that the upper looper be threaded BEFORE the lower looper because the lower looper thread will cross OVER the upper looper thread as the final step before going under the presser foot.
ALWAYS RAISE the presser foot when threading!!! This releases the tension disks.
Also, when threading through the tension disk, be sure to give the thread an extra little tug to make sure the thread seats firmly in the tension disk. (Grasp the thread just below the thread stand with one hand and then grasp the thread below the tension disk with the other hand and give a little tug--sometimes it will make a little popping noise when it seats.)
Start out with the tensions set at the midway point. From that point, you can test your machine to make sure it is serging properly. Then you can adjust the tensions to suit you or the project you are making.
If the either looper thread breaks or pulls out, remove BOTH looper threads and rethread from the beginning!!! Trying to finagle threading of only one thread will most often result in a machine that will not operate correctly. Just bite the bullet and rethread both threads (in the order specified in the manual).
One more hint: NEVER pull the thread out of the machine by pulling it UP through the machine. This could damage or wear the tension disks. Always clip the threads just below the thread stand, RAISE the presser foot, and then pull the clipped threads DOWN through the looper eyes and needles.
Be sure to clean and oil your serger frequently. This is very important to get the best performance from your machine. Use only fresh oil recommended by the manufacturer and apply only a couple drops each spot.
are you using a wire threader or tweezers to thread up? also some overlockers have a slide mechanisim on the looper so you can get to the eyelet, not familiar with this model but your manual should show the threading method. I usually turn the flywheel so the lower looper is all the way to the left and thread up the lower thread carrier, then turn flywheel again to move it to the right, then using the wire threader, I hook the thread from the left and bring it over to the right side, then thread up the looper eye. Hope that makes sense to you
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.
Open up the front cover. There should be a diagram right there, and you want to thread your serger step-by-step per the color-coded diagram so that the needle is in time with the movement of the loopers. If you randomly go about threading it instead of in sequence, the threads will collide and you will create a jam. The usual threading order: Upper Looper, Lower Looper, Left Needle, then Right Needle.
Do you have long serger tweezers?
Do you have a Looper Threader?
If not, these are great tools to assist you as the Lower Looper is threaded right to left- an eye all the way to the far left, so it helps to have the tweezers and Looper Threader to maneuver in this very tight area. Many new serger users don't realize that other eye is "hiding" and miss threading it! Hopefully, you have a manual with additional pictures to help guide you. If you need a manual, try allsewingparts.com and perhaps they have one specific to your serger.
Note: When you insert your needles (make sure they are #11 and #14 specific for your particular machine), the left needle will be the same size as right needle, but will APPEAR higher once both are pushed up into each of their respective needle shafts.
Note: Hold onto needles or put a piece of fabric under the area when changing them/replacing them because they can easily fall out causing damage to your machine.
Hope this helps.
Apparently either you have no needle threaded to lock the stitch or both loopers aren't correctly threaded. You must thread your UPPER looper first (don't know what color yours is), LOWER looper next, RIGHT needle next and last the LEFT needle if you are using the 4 thread overlock stitch. It sounds like you are having trouble with your lower looper. Look for the lower looper threader to help you thread it. Your manual should show you a picture.
I have been dealing with the exact same problem for 2 hours and no answers!! I have just discovered that if you move the stitch width finger to R instead of N, your threader will work!! Hope this helps :)
These things are always complicated when you try to write them down, so I suggest a call to your local Bernina dealer to arrange a quick lesson on how to do it.
If you can go back to the dealer whence it came, so much the better..........perhaps you could go in and buy some things you need and then as you are leaving, make the enquiry with the machine in your car, they may be able to show you how to do it right away......building relationships is a very good way of feeling comfortable about asking for help.
Also.......... If the manual diagram is too small, a local library or stationery supplier should be able to magnify a photocopy for you to see it all more easily.