My machine was working fine.... Suddenly, while sewing the cloth stopped moving ahead. I checked the threading, the bobbin etc. I guess, the metal zig-zag teeth (which are just below the needle) are not pushing the cloth. Now when I start the machine, the needle keeps going up and down on the same spot on the cloth. I don't know what could go wrong....just few minutes back the machine was fine.
I have the same problem, the zig zag will not move forward.
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You need a fatter needle. The skinny needle will not open the leather enough for a smooth flow of thread and that's why the bobbin is bunching up when the top thread is sticking. Make it easier on your machine by using an appropriate size needle while sewing leather.
check the feed dogs in the needle plate area to see if there up, if you can see them & touch them with your finger, I'm putting in a link for a free manual, so you can see where the lever is to the feed dogs, just incase they are not up. if they are up then they may need to be checked to see why they aren't moving the fabric. http://www.singerco.com/uploads/download/1199_8770-efs.pdf
is the problem the fabric is not moving forward but staying in one spot? which would mean the feeddogs need to be checked to see what position there in --up for sewing---down for darning or the thread is not feeding into the machine?
Do the feed dogs move up and down? If they dont the plastic gear underenth has probably broken you can take this to a singer dealer and have them replace the plastic gear with a nylon one which would last longer than that did
ok it sounds like either the gear on the rotoary hook is bad "lot of money to fix" or there is a small pin that moves the feed dogs make sure it is setted correctly. also make sure the pressure foot is down all the way.
We need to do some examining. Remove the foot. Put the stitch length dial at the longest stitch. Turn the wheel and see if the feed dogs move about 1/4 inch. Also check to see that they rise just slightly above the needle plate. If it does these two things it will work. If the teeth don't rise above the plate, remove the needle plate and clean the lint out from between the rows of teeth. If you find a lot of tightly packed lint there this will solve your problem. Reinstall the needle plate and foot. If the feed dogs don't move about 1/4 inch, you probably have a problem which is going to require the services of a technician. sewman7