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THE NEEDLE BAR
Each manufacturer has engineered their sewing machines differently according to their particular standards. Therefore, the adjustment and methods of accomplishing the same task of timing the needle bar (needle) to the shuttle hook will be different, depending on whether your machine has gears, belts or other methods of adjustment. We will try to explain in detail the different methods used. If your machine configuration doesn’t fit any of the following examples, study the examples carefully, and using your sewing and mechanical ability, you’ll be able to figure out which is closest to yours.
Keep this fact in mind – as the needle starts the UPWARD movement from the LOWEST point of its stroke, the needle thread forms a loop (see Figure -1). It is at this time that the shuttle hoop point must enter the loop, which takes it around the bobbin case, forming the lock stitch of the lower and upper threads.