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Re: 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.
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First make certain that the needle is the correct length and it is up into the needle clamp as far as it can go. if that doesn't work, the needle bar may have come loose and is too far down. Another possibility is that the timing has slipped. Your authorized Singer repair center should be able fixit easily.
What makes you think your timing is off? What is it doing/not doing that makes you think it's off? Before you do anything ,make sure your needle is all the way up in the clamp. A needle inserted too low--even a little--can cause the same symptoms.
since you were sewing harder material it's possible that the machine jumped time & needs to be checked at a sewing machine shop but try putting in a new needle first if it still is hitting the shuttle then it needs to be checked.
Do you understand how a stitch is formed on a sewing machine? The needle goes down to its full down position. At that point the shuttle hook should be pointing right at the needle scarf, ready to go past it as the needle starts to go up.
When the needle starts its upward travel it forms a loop... the shuttle hook enters the loop and the bobbin thread is "captured" in that loop.
If your machine's timing is advanced, the needle will hit the hook and break or make nasty thumping noises. If your timing is ********.... the hook misses the loop entirely and does nothing.
So... open up the entire bobbin/throat plate area.... take the foot off so you can see. Clean if necessary. Then turn the hand wheel by hand until you see that the needle is at the lowest point of travel. Where is the shuttle hook?
From there you'll have to use your logic to find the right screws and adjust the hook.
Here' is a Parts Chart for your machine. http://www.parts.singerco.com/IPpartCharts/404-1_4_5.pdf
Easy to do remove sole plate remove shuttle and case, don't forget to pull the spring loaded plate to one side by inserting a electrical screw driver in the slot and twisting it anticlockwise to release the case, remove drive dogs this will the expose the cotton pickup assembly turn the hand wheel anticlockwise until the hook gets close to the needle now watch the needle it should be in the lowest position and just as it starts it's way back up the hook should be just going behind the needle to pick up the tread if this is not the case and it's out of position then hold the hand wheel tight and insert a small screw driver into one of the gaps in the base were the shuttle case fits in away that you are able to move the hook assembly one way or the other with a gentle pressure and move the hook just to make it enter just behind the needle as it only just starts it's way up at this position it is now complete and you can reassemble and run slowly at first just to make sure things are okay.
turn the machine slowly by hand as the needle goes down check it does not hit the foot ,then the hole of the plate.
If it enters the hole and then stops aganst something it is possible the shuttle or bobbin is not in right take them out and replace them again.if the problem prisists take the needle plate off and warch as the needle goes down what it is hitting.
if the hook or shuttle is in the way the timming could be out.