Do you need to wind a bobbin or place it in the bobbin case for sewing? For bobbin winding, make sure that the top thread is on the spool pin with the appropriate spool holder. Bring the thread under the first thread guide (going from right to left, as you face the front of the sewing machine). Bring the thread around the bobbin winding tension disc so that the thread is under the tension disc. The thread goes from left to right on the front of the disc. Bring the thread to the bobbin and put the thread goes through the hole in the bobbin (from the inside of the bobbin to the outside). Put the bobbin on the bobbin winder spindle and slide the assembly to the right. When the spindle is in the correct position, the needle bar will not move. Hold the free end of the thread above the bobbin and start the sewing machine. After the bobbin has a few layers of thread, stop the machine and cut the excess thread off at the top of the bobbin. Resume winding the bobbin until full (or as full as you need). The machine will automatically stop when the bobbin is full. Move the bobbin winder spindle to the left and cut the thread to separate the bobbin from the top thread. Remove the bobbin from the spindle and thread the top thread back through the guides to the needle.
To place the bobbin correctly in the machine, remove the hook cover plate if you have another bobbin in the machine. Push the release button to the right and then lift the cover up. Lift the previous bobbin out of the bobbin case. Put the new bobbin in with the thread coming off the bobbin counter-clockwise with the hole of the bobbin up. Bring the bobbin thread around the case and into the notch near the front of the bobbin case. Continue to pull the thread lightly around to the second notch. Leave about 6" of thread out past the second notch. Replace the hook cover plate.
Sears Parts Direct has the manual for the Kenmore 385.19106900 here: https://www.searspartsdirect.com/partsdirect/user-manuals/38519106900-kenmore-parts-manual . The direct link to the manual is https://c.searspartsdirect.com/mmh/pd_download/lis_pdf/OWNM/L0911547.pdf . See page 20 (page 32 of the PDF) for the images that go with the bobbin winding directions. See page 22 (page 34 of the PDF) for the bobbin threading directions and pictures of the notch locations.
I hope this helps.
Cindy Wells
SOURCE: top thread will not pick up the bobbin thread
Timing is off, is is possible that you broke a needle or sewed over a pin. timing needs to be re set by a professional.
SOURCE: NECCHI, model 4795. Thread bunches up at bobbin.
it sounds like the thred tenshion is to loos or the timing has sliped a little and its off a bit this can also happen with wear on the gears or just a loos fixing letting the timing slip back a bit,
SOURCE: Singer Sewing Machine model 9224. Bobbin thread
If you turn the handwheel, can you see a metal ring rotating around the outer edge of the bobbin case? If not rotating, broken gear or timing belt off.
If that ring is turning, remove the needle plate and bobbin case. As this ring now rotates, you will a finger on the ring that will pass behind the needle from right to left and it should catch the thread from the eye of the needle. If this finger, the "hook" passes above the eye, you have a timing problem.
Let me know.
SOURCE: don't know how to thread the bobbin Singer model
Try here for an explanation.
http://www.ehow.com/how_7164323_wind-bobbin-singer-9113.html
SOURCE: how to thread bobbin in singer 6412 model
singer has a free pdf manual to download
Go to the singer website
Go to the home page
Go to customer service--click on it--it will show a small menu--click on instruction manual
In the box put the model number (example 6412) & click search
Pre-tension disk 
Bobbin winder shaft 
Bobbin
Pre-tension disk 
Pulling it in as far as possible
Spring on the shaft 
Groove of the bobbin
Sewing speed controller
Wound evenly 
Wound poorly122 views
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