Question about Singer 1120 Mechanical Sewing Machine
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Posted on Jan 02, 2017
SOURCE: Singer 1120 timing
Timing" is the alignment of the needle at its lowest point and the hook on the bobbin case. The point of the hook must pass directly behind the "scarf" of the needle fo the interlocking loop of a "single needle lockstitch" machine to occur. Look closely at the needle. You will see the long groove along the front of it. This is where the thread rides as the needle goes up and down. If you look at the back of the needle you will see a flattened area just above the point. This is the "scarf"; it's flattened to permit the hook of the bobbin case to run right by it and catch the loop.
When a machine is out of "time", the hook is either too early or too late, OR to far away from the scarf to make the connection. You can send a machine out of time by hitting a pin, or breaking a needle "hard" (too fast through too many layers, etc.). You can usually identify a machine that is out of time by multiple skipped stitches at high speeds, or by stitching fast and then quickly putting it into reverse. Sometimes, you can scrape by if you rotate the insertion of your needle a little bit, this can help compensate for minor timing issues.
Posted on Sep 07, 2008
when you have bunching on the bottom, you have a problem with the top thread: no tension. (and visa versa) Make sure the thread runs through the tension discs, these discs are activated when you put the presser foot down, so you want to thread the machine with the foot up, also feel if there no burrs, hooks, or whatever, so your top thread comes smooth off the spool, no jerking.
Posted on May 26, 2009
Usually when this happens the bobbin is in wrong, replace it make sure the thread is going out the right way, make sure there is no lint or small pieces of thread around or underneath the bobbin area. Make sure you thread it with the foot up. Also make sure you are usng the right bobbin for the machine. They can easy get mxed up.
Posted on Jun 20, 2009
Threaded with presser foot up.
Feed dogs are engaged.
Stitch length set at proper length.
Thread is feeding from the bobbin spool in the correct order and through the proper guides.
Problem still there - take the machine and a sample of the stitching back to the repair guy and ask him to check the timing.
When you pick up the machine, take a scrap of fabric and give the machine a thorough test run - threading, bobbin winding, stitching before leaving the shop.
Posted on Feb 21, 2010
"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.
Posted on Apr 07, 2010
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