I don't have the instructions on my Elna SU (got it at an estate sale- model year unknown) and I cannot figure out how to thread the bobbin so that it does not jam when I start sewing. Any advice appreciated!
Please describe the type of bobbin you have. Is it held inside of a removable metal casing? Or is it a dropin type? Is the sewing machine what is known as a "freearm" which you can put a sleeve or trouserleg over or is it a flatbed type? When I know this I can help you further.(I used to sell sewing machines).
OK-you drop in the bobbin with the thread running from right to left. You should see 2 grooves-cut out-and you slip the thread into the first one then towards the left and up into the second one. Its hard to describe so I will try to find you a link. When the thread has been laid this way, lay it towards the back of the machine and close the bobbin cover. If you go into a store where there is a demonstrator selling machines and tell them you have this type Im sure someone will show you. It is really very easy.
Here are some tutorials:
http://www.youtube.com/watch?v=4nUpNf31A...
IT IS A METAL CASE . DO YOU THINK IT IS THE TIMING . YES I CAN PUT SLEEVE ON IT
I want to know how to get the bobbin out to re-thread
to remove the bobbin, open the rear flap, then use the little plastic device on a spring which is located just to the side of the needle bar, it pulls down and fits into the middle of the bobbin, then pulls it out. If your machine has had its bobbin remover broken, then just use the handle of the Elna screwdriver which came in the accessory kit, it fits just as well.
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If you go to this solution
http://www.fixya.com/support/t1064475-elna_carine_electronic_sewing_machine
you'll see the threading diagram for an Elna SU, threading up is same on all the air electronic Elnas (the SU, TSP, 500, Jubilee and Carinas).
If clicking on the link doesn't work, then just select the text, control C to copy, the paste it into your browser address bar.
Trust this helps.
As an after thought, these machines are beautiful but there is two things you must do. You must get the bobbin thread into the tension spring, it should click as it goes in correctly. If you lift the thread vertically and it pulls back out of the groove, then do it again, place finger tip on the bobbin to keep it still and pull the thread anticlockwise around the case until it slips into the little groove on the right, then press down on the thread until it clicks into the spring.
And secondly, ALWAYS hold the two threads at the beginning of a seam, until you have done 6 or 7 stitches, don't let the thead tails go as they may get pulled back down into the bobbin case and will then jam it.
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Some sewing machines do a similar "overcasting" stitch but it won't be big like you might want on polar fleece or a blanket edge. The commercial blanket stitch you see on blankets will be done by a special purpose industrial machine and it applies a single thread just as you would when doing a blanket stitch by hand. So look at the stitch selection dial on your machine and see if there is something resembling a blanket stitch but it usually would only be 4mm wide, the maximum your machine probably can stitch. 
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It is a drop in style and you can sew a sleeve with it. Thank you!!
Not sure if I replied correctly last time, so I apologize if this is a double post: It is a drop in style bobbin behind where the needle goes. It is a freearm. Thank you!
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