What size bobbin is used in the Hello Kitty

Hello Kitty
The 'tiny black semi-circle' sounds like the bobbin winder or a part of it. That 'little' part has to go back onto the bobbin winder, or else the bobbins will over-fill. However, if the bobbin winder (the 'thing' that holds the bobbin in place while winding) is pushed toward the bobbin spindle ... pull it back and the machine will 'let' you sew. But still no winding bobbins. Refer to pages 10 and 11 of your manual, or download it for free from:
http://manuals.husqvarnaviking.com/
The part that came off, should be installed to factory specifications which a qualified technician will be able to instal.
Hopefully this will let you finish what you started.

Please give me a thumbs up if this is helpful.
Sewingirl/

According to this, it takes a Class 15 bobbin:

Bobbins 102261103 10pk


....

There is a removable tray on the front. Pull it to the left. This will expose the bobbin door. Lift the clip on the bobbin case to remove and replace it on the hook.

most likely the bobbin thread is wound around the components.
remove the bobbin and check for a mass of thread cut it all away and remove every last bit then it should work

if it's out of alignment then it will have to be fixed at a sewing machine repair shop

There is a free manual for the chainstitch Hello Kitty which may, or may not help. try here. http://www.nkok.com/FCKFiles/File/4303%20Lockstitch%20Manual%20&%20Project.pdf

Other than that you may need to buy a manual from some of the online sewing machine manual sellers

double check the needle hasn't moved as if its not in the correct position it will not go low enough to pick up the bobbin thread.
Make sure you have threaded top properly and the bobbin in put in the right way, each machine has its own direction the bobbin thread should come out ( eg clockwise)

you should be able to buy one at any janome dealer

Hi,
If you are getting loops on the bottom side of your fabric then it is a TOP tension problem, usually the thread is not between the tension discs.
Here is a simple check: Thread the upper path and stop short of the eye of the needle. Drop the presser foot. Now if you pull on the thread you should feel the drag of the tension discs. Increasing the tension setting should make it harder to pull. Now while your pulling raise the presser foot. All tension should be gone and the thread will pull thru easily.
I have worked on a few Hello Kitty machines and usually there is a single screw to remove the nose cover, exposing the needle bar and slack arm assembly. The slack arm does just that, it takes up the loop and the tension discs keep it from pulling more thread off the spool. Look for some thread wrapped up in the mechanism and clear it if you can.
This is were I find most of the problems
Good luck!

I own this little gem of a machine. It definitely sews a perfect stitch. I'm assuming you own the green 3/4 size machine as denoted by your product number. The half size blue one pictured is incorrect.

Anyway, this machine sews a perfect stitch, due to the oscillating bobbin. Most sewing machines with rotary (drop in) bobbins don't have an easily accessible bobbin tension screw, which means your fabric is usually slightly puckered. Fiddling with only the upper tension helps very little. This frustrates me to no end for sewing long curtains, clothing side seams, etc. Wrong tension causes them to hang with puckers, making them look awful. With the Hello Kitty 3/4 size Janome, there is a screw on the bobbin case which allows you to adjust for every thread diameter perfectly. Always a perfect stitch, if you take the time to adjust this screw.

To adjust the bobbin for a perfect tension, load the bobbin into the bobbin case and thread it through the guide. Holding only the thread between two or three fingers, let the bobbin case dangle below. This will be slightly difficult, because the bobbin will want to fall out of the case. Don't worry, just don't move it around too much and it will stay in long enough for this test. If the metal bobbin case slowly drops lower, unwinding thread as it goes, the thread is too loose. Tighten the screw on the side of the bobbin case a little (about a quarter turn.)

If the bobbin case seems to be dangling firmly, give the thread a gentle tug, lifting up fairly quickly. If it doesn't release a couple of inches of thread, it's too tight, loosen the screw. You know the tension is perfect when a quick, light tug of the thread releases a couple of inches of thread.