Janome 9000 my fabric will not feed. needle just stays sewing in one place. mass of thread under fabric, so assuming it's the bobbin.

Hi, have you thoroughly cleaned the lint and thread from under the feed plate? Also, make sure that the needle and thread are the correct threads etc for the material sewn.

is it just the fabric that is gathering or the bobbin thread also ?

1)Check that your bobbin does not have a nick in it where the thread can catch and won't feed smoothly.2) make sure the upper and bobbin threads are the same.3) pull out the bobbin case and chect to see if there is a clump of lint.4) make sure the feed dogs are moving the fabric through smoothly,some fabrics can get caught on the dogs and make the bottom thread get loopy.5) check your needle,if it's bent or has a bad tip,it can mess up the stitch.

When selecting a stich, there's a button with a triangle with one edge pointing down. There you can select Needle Position and Stitch Length. --PDF manual, page 23

The thread tension has no influence on the stitch length. It just adjusts, where needle thread and bobbin thread 'meet' inside the fabric. A too high tension means, the bobbin thread is pulled trough the fabric and can be seen on the upper (needle) side. A too low tension means, the bobbin thread is not pulled through the fabric and you can see the needle thread on the bobbin side.

run you finger over the feed dogs under the foot - can us feel them above the surround? if not, you have placed your machine into free style sewing, and the feed dog does not advance the fabric in this mode. Look in your manual and see where the feed dog gets lowered/raised - raising it again should solve your problem.

change the needle--
Correct needle insertion is mandatory for proper use of your sewing machine.
Raise the needle bar to the highest point, then loosen the needle clamp screw to remove the old needle.
Place the new needle in the needle clamp with the flat side of the needle facing the back, (round needle, the groove in the needle should face away from the shaft).
Push the needle all the way up as far as it will go. Then tighten the needle clamp screw.

rethread the top thread--top & bobbin
check the bobbin to make sure the bobbin is not damaged
reinsert the bobbin in the case correctly

Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
thread may be hanging up in bobbin case--check area for loose threads or lint

First do a process of elemination. Unthread the machine, both top and bottom, take out the needle. Place a piece of fabric under the pressure foot, lower the pressure, and depress the foot control. Does the fabric feed? If it does, then put in a NEW needle, thread up the machine, and see what happens. A dull needle won't prevent the fabric from feeding. If the fabric does not feed with no thread, then you have a pressure foot pressure problem, or a feed dog height problem, or a feed step motor problem, or possibly a board problem. If it only has a problem when you thread it up, then maybe you have a burr on the needle plate and the thread is hanging up on it and preventing the fabric from feeding. Check for all of these and if you still need assistance respond back.

There has to be a problem in your threading or your needle. You may have the needle inserted backwards, flat side has to face rear or the needle is bent. Totally unthread your machine and make sure that there are no tangles and that it feeding the right way. Watch how they show your for threading and winding the bobbin, plus threading the bobbin. Good luck, but I truly think it is in your threading.

The presser foot is not suppose to feed. It's purpose is to hold the fabric in place as the feed dogs feed the fabric from the front to the back of the machine as stitches are formed.

Check the needle to be sure it is installed with the flat side of the needle shank facing the back of the sewing machine.

Refer to your manual to be sure the bobbin thread is feeding from the bobbin spool in the correct direction and through the guides.

Pull the bobbin thread up by lowering the threaded needed down and then back up. Pull both threads under the presser foot and to the back of the machine.

Set the stitch length to 2.

Place a scrap of fabric under the presser foot. Holding onto the ends of both threads, lower the needle into the fabric for the first stitch.

If the machine still does not stitch, the machine may need to go in for maintenance as the timing may need to be adjusted.

If the feed dogs are not moving, this also needs to be repaired by sewing machine service tech.