Need to adjust needle to shuttle timing
SOURCE: Singer 1120 timing
http://www.sewusa.com/Sewing_Machine_Repair.htm
this page should help you. If you need any further assistance let me know. If you have a moment to accept and rate it accordingly I would greatly appreciate it.
Thanks,
Lee
SOURCE: Singer Simple Shuttle Hook Catching Needle
Sounds to me that your machine is out of time. I recommend you take it to your local repair center.
SOURCE: screw was loose lost timing with bobbin and
Try this link, it should help.
http://www.tandtrepair.com/600TandSstuff.html
SOURCE: my singer sewing machine no. 127 vibrating shuttle
There are no adjustments at all on that model, it has to be down to the needle for some reason
SOURCE: Singer Confidence 7463 - needle
Have you changed the needle since you purchased it? A needle should be replaced every 4-6 hours of stitching so for each garment sewn as a rule of thumb. So try replacing the needle, cleaning and oiling the maachine as per the manual. Check needle is in the correct way, it is easy to put in backwards if you aren't familar with them, flat shank to the back and there is usually a scarf (cut away area) at the back of the needle which is where the rotary hook under the needle plate comes around to catch the upper thread during the stitch process. So if needle is in backwards this will cause stitching to fail.
So elimate the needle firstly.
If this fails and the knocking noise continues, then it could be that the timing has been knocked out. It can happen if you sew over a pin and hit it hard (or the needle strikes the foot if stitch setup is wrong for the foot being used). In this case, you'll need to take it back to the shop for the serviceman to fix.
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