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On most machines, it is important to ALWAYS raise the presser foot when threading the machine (although the instruction manual says to raise the presser foot only to pull the thread tail under it). Be sure to give the thread an extra little tug when going through the tension disk to seat it properly. Be sure to thread in the order as specified (Upper looper, Lower looper, Right needle, Left Needle). If the machine messes up, it is usually a best policy to remove all the thread and rethread from the beginning. Threading out of order will almost guarantee failure!!!
Your owner's manual should have instructions for rolled hem settings. My Bernina manual has a the following settings:
Medium weight fabric
80/12 Universal needle
3 cones serger thread
Upper looper 3-5
Lower looper 7-9
Left needle (no thread)
Right needle 3-5
Stitch length 1-1.5
Cutting width 2-3
Differential feed N
Can use woolly thread in the upper looper, but the tension may need to be loosened since the woolly nylon thread will stretch.
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.
I would suggest that you drag out the manual (or buy one if you don't have it) and then go to You-tube and search on threading overlockers and watch a video or two. The threading techniques are same for most machines, you need to thread loopers, then needles through all the thread guides. Open the front flap of your machine and check if there is a threading diagram there and follow it. MAKE SURE YOU ALWAYS RAISE THE THREAD AERIAL TO FULL HEIGHT BEFORE YOU USE THE MACHINE.
Also make sure you use the correct needles for it, usually EL705 rather than the standard sewing machine 130/705H. It has a groove down the front which helps with stitch formation.
I would also suggest that you hunt down a local dealer and enquire about classes on cleaning, threading and using an overlocker as it will help you so much.
And if your machine accessories are not all there, then invest in tweezers and the fine wire threading up gadgets, they really help getting the thread into needles.
It sounds like your loopers are jammed.....if not,something else is....These are very cheap machines made in China..imported initially through jSM joys Sewing Machines...Put it back on ebay as soon as you can...