Question about Brother LS-1217 Mechanical Sewing Machine

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Timing problem The problem started by loud metal sound like needle hit something, than machine stopped because of bunching threads underneath the fabric. It looks like the hook is not timed with the needle anymore: 1) The needle does not bring up the bobbin thread , 2) The hook does not catch the thread from the needle at all: The hook point passes the needle in the middle of the needle hole, when it should pass it just below the midpoint of the scarf on the back of the needle, what is above the hole of the needle, as I understand. Is it possible to adjust the rotation of the hook in this model of sewing machine? In older sewing machines this rotation adjustment was possible by loosening the three large set screws on the backside of the hook that secure it to the rotating shaft. What can be done for this model?

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Re: Timing problem

You might have to look at loosening the set screws for the gear on the lower shaft that drives the hook driver gear . Loosen the screws, slide the gears apart, then adjust the hook so it is entering the scarf of the needle on the upstroke. Slide the gears togeather so they mesh again and it should be back in time. There are other factors though such as needle height adjustment which is done with the needle bar and hook and needle clearance (the distance between the needle and hook) which should be about .030. I'm a Bernina tech but many machines work the same principle. Good luck.

Posted on Aug 23, 2007

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There is thread pieces under the tread plate and when the machine tries to trim the thread it doesn't and sounds like it's hitting something

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I just bought it and its sounds like metal getting hit by the needle, and the thread bunches up underneath fabric.

if it is brand new then have it fixed under warranty
if used then it appears that the needle/bobbin timing is out with the needle hitting the bobbin carrier ot the hook hitting the needle.
bunching up of thread under the material is a sign of upper tension to light
suggest that you have a service done to fix it.

Apr 10, 2015 | Sewing Machines

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Top thread won't pick up bobbin thread

The machine's timing may be off and you can take the machine into a repair shop or contact the manufacturer through their web site.

Dec 05, 2013 | Singer 7422

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Needle wont catch bobbin thread. Think timing is out.

First change your needle... it's probably bent and make sure you are using a needle FOR Denim in a size 18. Hand run the machine... if you still feel it hitting something... it is out of time. Take it in for repair.

Oct 05, 2012 | Singer 8763 Curvy

1 Answer

The thread is bunching up under the needle and needle keeps hitting something metal down in the bobbin case which then stops the machine. I've rethreaded bobbin, adjusted tension, checked needle &...

Your problem stems from the faulty foot lever mechanism. It's coupled to the upper thread tension control which only provides tension when the presser foot is in the locked down position.

If the presser foot won't positively engage in the down position, there's no upper thread tension and the thread bunches up below. Everything else stems from there. If the needle has hit the bobbin case too frequently then the bobbin timing may also be slightly out and the needle itself will be damaged and won't pass straight through the fabric; it only takes a tiny deflection from the vertical as it passes through the workpiece for the needle to flex and hit the bobbin case.

In summary, your machine is in desperate need of repair and adjustment. You haven't stated which exact Singer model you have, but they are usually easy to get servicing manuals for or you can take the machine to a sewing machine servicing specialist. Most singer spare parts (even for 100 year old machines) are usually still available fairly cheaply from a variety of sources, just enter "Singer spares" into your search engine to find suppliers.

To prevent re-occurrence, clean the mechanism regularly and lubricate it as directed by the manufacturer using sewing machine oil. Depending on how often you use the machine, do (or have done) a more thorough service periodically to check the timing and also that all mechanism screws remain tightly fastened.

I hope that my reply has shed some light on your problem and enables you to decide what to do next. Please take a moment to rate my answer.

Sep 30, 2010 | Singer Sewing Machines

2 Answers

Thread is knotting up on bottom of fabric causing it to stop

1.check the needle & see if it's bent--if so replace
2.lay the needle on a flat surface & roll the needle over if it doesn't roll true replace
3.check for blunt needle-if needle makes a popping sound when needle penetrates fabric
4.needle is not all way up in holder
on my mechanical sewing machine sometimes the threads come off the take up lever, that causes the thread to bunch up under something I'm working on
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Jul 28, 2010 | Janome 4623 Mechanical Sewing Machine

1 Answer

Bobbin thread tangling up

are you doing embroidery? if so turn off jump stitch cutting if possible. is the machine threaded correctly (pull needle thread out of machine and thread again with presser foot raised.

check for foreign matter in needle tension assembly. ensure there is sufficient needle thread tension.

the thread you see caught up underneath the fabric will be needle thread and indicates insufficient needle thread tension or something preventing the needle thread from being pulled up into the fabric (maybe a damaged bobbin case, or bobbin case position finger, or damaged needle plate hole).


Jul 27, 2009 | Baby Lock Ellure

3 Answers

Bobbin problems

Any time you have looping on the bottom, it is almost always related to the upper tension and not anything in the bobbin area.
A good way to troubleshoot this is to turn the machine off, blow out the upper tension disk assemblies with canned air, (the machine needs to be off because most canned air uses butane as a propellant. Butane + electricity = bad;) replace your needle, and rethread your machine. Once you've threaded it to the point where you're about to put the thread through the needle, "floss" the thread forward and backward to ensure that the thread seats correctly into the tension assemblies.
Set your tension to around 4.5 for most applications, and drop your presser foot. Give the thread a gentle tug to see if the tensions have engaged the thread, then thread the needle.

If doing this does not address the problem, you probably need to have your tensions professionally calibrated. This is also true if the needle is in fact hitting something in the bobbin area. This is usually caused by the machine's timing being out of alignment, which is not something that can be fixed at home.

Good luck,


Aug 24, 2008 | Singer 6038 Mechanical Sewing Machine

1 Answer

Needle won't move; something stuck/dislodged

Can you remove the bobbin? Sometimes when thread gets bunched up under the lower plate it will force the bobbin out of position. Try taking it out and cleaning any loose thread and lint from the area. Put a couple of drops of oil on the outside of the bobbin case and re-insert it. Make sure you lower the needle and pull the bobbin thread through to the top and back behind the needle before beginning to sew again.
Hope this works!

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