Question about Janome 4623 Mechanical Sewing Machine
My bobbin thread keeps breaking. I've removed what lint I can see and I have changed the bobbin.
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Posted on Jan 02, 2017
First, in order to get the bobbin thread up, you have to turn the wheel backward, not forward. If you try this, and it is not the problem, keep going.
Next you need to check the needle. There is a screw on the right side of the needle carriage right underneath the underside of the top...unscrew this and the needle should come right out. The flat side of the needle shank should go towards the back of the machine. If it isn't, switch it so that it is and try again.
If this doesn't solve your problem, what has happened is that the gears in the machine have gotten out of alignment. There is an easy fix:
Take off the plate that covers the bobbin chase...there are two screws one on each side. Remove these...you need a stub screwdriver, because regular ones will not fit under there.
Remove the bobbin carriage and the bobbin, making careful note of how they fit back in. Take a picture before disassembling it so you have a reference.
The part that carries the thread around the bobbin is still in the machine. Turn the wheel and you will see it rotate. What has happened is that the needle is not going down in the machine at the right point because someone kept sewing after it jammed and one gear kept going while the other one didn't and now it is out of alignment. These machines have plastic gears and the can slip past each other if you aren't careful not to stop immediately when they jam.
To fix it, you are going to have to do some trial and error. Grab the rotating part of the bobbin chase and hold it firmly. Rotate the wheel forward until you hear it click once. Then rotate the wheel backward again and see if it grabs the top thread. If it doesn't, repeat holding the bobbin chase and turning the wheel forward until it does.
Once you have the gears basically aligned, you will need to reassemble everything. Put the face plate back on and put at least one of the screws in all the way. The face plate holds the bobbin chase in correctly and if you don't fasten it it will not work correctly.
Now try sewing. If it starts to jam, stop immediately, cut the threads and look at the back. If it's a loopy mess, you are going to have to dissamble as before and again grasp the bobbin chase and turn the wheel forward one more click, then reassemble and try again. Eventually, you will find exactly the right alignment and the machine will sew perfectly.
I just had to make this fix on my own machine...I didn't want to take it in for repair because the bench fee alone would cost as much as the machine did!
There are some great video's on YouTube for help with threading the machine...look for StampTV and you should find them. Good luck!
Posted on Apr 21, 2010
SOURCE: the thread keeps breaking on
maybe something is catch in the tension guides, which is giving you a tigher tension. Try pulling a thread through the guides towrads the needle and looking for an obstruction
Posted on Sep 13, 2010
SOURCE: I have a Janome 1600P
Is it a new needle? a dull needle or one with a burr on it can cause those problems that you mention.The kind of needle you use is also very important. I like to use a 70/10 or 80/12 jeans needle depending on how thick the thread is.
Posted on Apr 21, 2011
Are you sure you have got the top thread threaded correctly including the take up lever? Start at the thread spool and follow the thread all the way through the thread path checking that it is not snagging on anything enroute and that the thread is correctly through the tension device. Also tension dial should be on 4-5, if its higher this could be breaking the thread. YOu should not need to adjust top thread tension more than a half increment at any time.
Other possibility is that the bobbin holder under the needle plate has moved out of alignment and then the top thread is catching there as it goes around the hook.
If you check your manual it should give you instructions on removing the needle plate (2 screws need to come out), then you can lift the bobbin case out towards you, clean underneath with your little brush, then reinsert it. There are two little red marks on the right side of the bobbin case and a stopper, these need to be lined up. Then put in bobbin and rethread into tension spring, replace needle plate, bobbin cover, and test stitch.
Hopefully one of the above is causing the thread to break.
Posted on Aug 03, 2011
Has the bobbin case dislodged and moved? there should be two red marks one on the bobbin case and one on the outer holder, are they lining up? Sometimes as these cases are held by a magnet, they will get dislodged and move slightly, especially in a jam up.
Take out the bobbin case and clean under it, then replace it matching up the red marks.
If the bobbin case has actaully been struck by the needle during a dislodgement, it may well pierce the bobbin case plastic, look for burring or marks on the outer flange area. If this has occured, the thread may catch on the burr as it comes over the bobbin and jam again.
You can buy a new bobbin case if yours is damaged or maybe just file the burring with an emery board (remove it from the machine first of course).
Lastly, check your needle hasn't been bent, burred, or put in backwards, any of these can prevent a stitch from forming.
If all the above fails, then it is possible that the timing has been knocked out and you will need to get it serviced by a technician.
Posted on Oct 17, 2011
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