Thread jamming under fabric

HI Elizabeth.
Found this on the internet.
There could be several things that could cause the machine not to pick up the bobbin thread.

• The upper thread could be tangled.
  Remove the thread completely from the machine.
  The correct size spool cap should be used for the size of the thread spool.
  Re-thread the machine according to the directions in the manual.

One Point Advice Place a spool of thread on a spool pin.
One Point Advice Upper threading

• Remove the bobbin and make sure the bobbin is threaded properly in the shuttle race.
  Remove any loose threads or lint in the shuttle race.

One Point Advice Installing a bobbin into a bobbin case

• You could be holding the needle thread too tight.
  Hold the thread lightly to keep the end from going down into the shuttle.
• The needle could be thread incorrectly.
  Thread the needle eye from the front to the back.
• The needle could be bent or improperly inserted.
  Install a new needle with the flat side of the needle facing the back.
• if this does not help you go to this link.

won pickup the bobbin thread Google Search

breaking needle thread can be from
using old cotton--- thread deteriorates with age
needle installed incorrectly--- groove to face thread
thread too thick for needle eye---smaller thread or bigger needle eye
thread not between tension plates but behind a plate and getting caught on the bolt thread

possible reasons include
old thread
thread too thick for the needle eye
needle not correctly installed where the thread runs down the small slot to the eye
needle thread tension too tight
needle /hook timing off a bit

Barbara,
Upper thread looping around the shuttle is typically caused by improper threading through the upper tension disks and takeup lever. Check the instruction manual, carefully rethread the top of your machine and make sure the presser foot is in the down position. If the problem continues it may indicate an issue with tension disks. Remove the upper thread, fold a clean piece of fabric and with the presser foot raised to open the tension disks, place the fabric it in the thread path, through the upper tension disks. Lower the presser foot and draw the fabric back and forth to clean any build up of grime and wax from the disks. Lift the presser foot, remove the fabric, rethread and try again.

If the problem persists, you should not need any tools to remove the shuttle to inspect it - sometimes it is necessary to remove the needle plate to lift it out. Check the edges and underside of the plastic shuttle for marks caused by needle strikes - these can catch the thread causing the issue you describe. If there are marks, you may be able to polish them out with fine (600 grit or higher) wet and dry paper. I generally replace them. Also check the tip of the hook for marks - you can often feel these with your fingernail. If they are present, you may need to get a mechanic to polish them out.

There could be several things that could cause the machine not to pick up the bobbin thread.


1. The upper thread could be tangled. Remove the thread completely from the machine. The correct size spool cap should be used for the size of the thread spool. Re-thread the machine according to the directions in the manual.


2. Remove the bobbin and make sure the bobbin is threaded properly in the shuttle race. Remove any loose threads or lint in the shuttle race.


3. You could be holding the needle thread too tight. Hold the thread lightly to keep the end from going down into the shuttle.


4. The needle could be thread incorrectly. Thread the needle eye from the front to the back.


5. The needle could be bent or improperly inserted. Install a new needle with the flat side of the needle facing the back.


If the problem persists, your machine may require service.

The bobbin thread tension has already been adjusted at the factory for general use. For most applications, no adjustment is needed.

When sewing with then thread on thin fabrics, the thread tension may not be adjusted adequately with the upper tension control dial. Therefore, the thread tension must be adjusted according to the procedure described below.

If bobbin tension is too loose and locks appear on the surface of the fabric, decrease the thread tension by turning the dial to a lower number.

If the result is still not satisfactory, then adjust the bobbin thread tension.

Increase the tension in the bobbin by turning the screw with a small screwdriver in a clockwise direction. However, do not turn the screw more than one full turn.

first start with the needle & see if it's bent-roll the needle on a flat surface & see if it roll correctly
when a needle is blunt it makes a popping sound when it goes thru the fabric
check the bobbin to see if it's warped-I have had some that were
check to see if there is lint or loose thread in the bobbin case area
rethread the machine to make sure the upper thread is not catching on anything
sometimes the thread can come off the thread take up lever
& sometimes it can get caught on the spool pin & also on the notch that's on the thread spool it's self---I've had this happen before
if you sew alot-good maintenance practice is to clean the bobbin case area at least once a week-if you don't sew alot-once a month & also under the needle plate
when cleaning under the needle plate-make sure you do not damage the top of the screws when you remove them to clean under the needle plate & because if the top of screws get damaged they can pull the fabric when the fabric goes over them
check also to make sure your top tension is correct

have you checked to see if the needle is bent-lay the needle on a flat surface & roll the needle over,, if the needle does not roll good -replace
blunt needle-if the needle makes a popping sound when the needle penetrates the fabric,,the needle is blunt-replace
sometimes if the thread comes off the thread take-up lever it can jam the thread in the bobbin area
try rethreading the machine
check to make sure the thread isn't wrapping around the spool pin
check the spool of thread to see if the notch on the spool is catching the top thread
check to see if there's a burr on the bobbin case
I hope one of these suggestions helps you
please rate this using the thumbs in upper right hand corner

Try flipping the bobbin spool so the thread comes off in the other direction.
Forcing means that the needle has been jammed against the sewing plate ant the needle is now out of timing with the bobbin pickup.

Hi!
There could be several reasons due to which the thread keeps bunching up underneath. 

It may be due to tangling of upper thread. Remove the thread completely from the machine, use correct size spool cap for the size of the thread spool, re-thread the machine, now remove the bobbin and make sure the bobbin is threaded properly in the shuttle race. Remove any loose threads or lint in the shuttle race.


You could be holding the needle thread too tight. Hold the thread lightly to keep the end from going down into the shuttle.
The needle could be thread incorrectly. Thread the needle eye from the front to the back.
The needle could be bent or improperly inserted. Install a new needle with the flat side of the needle facing the back.

Please rate the solution as FixYa and revert for any clarification.

Thanks
Rylee