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Or perhaps thread is knotted up in the feed dogs, under the needle plate and bobbin area. Raise and remove the presser foot, loosen and try to remove the needle, then try to remove or release the needle plate to expose the feed dogs so you can begin to clean out any thread tangles. Then open the race ring cover and remove the race ring, the entire bobbin case and hook from the machine. (If the bobbin and bobbin case are bound with thread, you may be able to remove the bobbin case and hook all as one unit.) If you can get those items removed, you can try to cut away whatever obstruction exists.
The simple workaround is to remove the needle plate, manually feed the bobbin thread through the needle opening from the bottom of the needle plate, and then install the needle plate in position.
For the Empisal Celebrity 550 you need to do this first. Match the positions of the hook and the needle very closely. Turn the machine on its far side to see the bottom view. Remove the cover plate. Directly below the bobbin shuttlecock there is a grub screw on the centre line of the bobbin. Undo this and move that assembly nearer to the needle by picking it up, as the machine lies. The hook must pass behind the needle by between 0.04 to 0.1 millimetres. Fasten the grub screw again very tight. Do this first otherwise your needle bar height and hook timing may be perfect, yet the problem will remain with no explanation.
Get some tweezers and a magnifying glass. Remove the foot, the needle, the bobbin cover and the feed dog/needle plate cover. Use the tweezers and magnifying glass to see the threads and tweeze them out
if im not mistaken, the bobbin when you place it in the bottom, you have to thread it is as well to the part where the needle comes down and collects and goes back up. please re-look at instructions for placement of bobbin
On the right of the black bobbin case there are two screws, you can slacken those screws off and move the bobbin case nearer to the guard leaving enough room for the thread to pass through, if the needle is hitting the bottom you may need to retime the machine.
Take it apart again and compare the original screw with the one you substituted. If they are not the same size, you will need to get one that matches the original.
Re-place the needle plate and when firmly in place, put the screws back in.
When the sewing machine is properly timed, all the parts work together in a seamless flow of coordination. The needle moves from it highest point down toward the needle plate. The feed dogs reach the farthest point toward the back of the sewing machine. The feed dogs drop under the needle plate. This is just before the needle point reaches the needle plate. The needle continues to move down dragging the upper thread under the needle plate. It proceeds toward its lowest point. The needle begins its rise back up. A loop of thread forms along the back of the needle. A special cut out on the back of the needle to accommodate this loop is called the scarf. The sewing machine hook slides behind the needle. The point of the hook slides into the thread loop and pulls the thread around the bobbin. The bobbin thread and upper thread wrap together. The needle and hook proceed through their actions under the needle plate. The feed dogs move under the needle plate from back to front. The needle proceeds to rise again up out of the bobbin area exiting the needle plate. At the same time the feed dogs rise up out from under the needle plate. They begin to move from front to back as the needle continues to rise. The thread from the bobbin flows through a bobbin tensioner providing resistance to the thread as it is drawn up by the upper thread knot. The upper thread is also under tension. This comes from the upper tension, thread guides, tension spring, and sewing machine take up lever. The thread from top and bobbin grow increasingly tighter until they form a locked stitch in the middle of the fabric. This process is repeated for every stitch. How do you adjust sewing machine timing?
The needle, hook, and feed dogs must move in harmony. If they fail to do so, the machine will not perform as expected. When the hook is just slightly out of time with the needle, you will notice skipped stitches. This may begin on only one side of the zig zag stitch or intermittently. If the timing is just a bit more out of sync, stitch formation will become impossible. If the feed dog timing is out of sync, the fabric will not move through the machine as expected. Threads may bunch up or the fabric may just not move. As you can see, timing is everything. click on this link directly http://www.fixsewingmachines.com/How-to-Adjust-Sewing-Machine-Timing.html
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1. Make sure you are using the correct needle and thread for type of fabric and it is installed correctly. Make sure bobbin is threaded evenly.
2. Tread path - make sure the machine is correctly threaded. Then, with your finger, feel for burrs, nicks or roughness on any metal parts that contact the thread. Open the slide plate, remove the bobbin and inspect the bobbin case and hook. Remove the needle plate and examine the needle hole. Sand any rough areas with fine emery paper and blow away grit. If burrs or nicks remain on the needle, presser foot, needle plate or bobbin case, replace them with exact replacement parts, if they remain on the thread guides, take-up lever, bobbin hook or tension regulator, take the machine for professional service.
3. Loosen thread tension by adjusting tension dial.
4. Clean feed dog, bobbin case, and tension discs. Unplug the machine. Use a small, stiff brush to wipe dirt and lint off the machine head and the needle bar area. Raise the presser foot and the needle to the highest position, open slide plate and remove the bobbin and needle plate. brush away dirt and lint from the feed dogs and bobbin case and remove any tangled thread with your fingers. Use a soft cloth to clean between the tension disc on the tension regulator.
5. Also check tension on presser foot
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