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If your fabric is stuck the liklihood is that the spool underneath is jammed up with threads take out spool and clear threads replace spool, it should be ok then
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go to a sewing trades shop/ retailer and ask them
there is a variety of generic needles that will cover a range of materials and the only needle that you will be concerned with will be the leather needle
which tension is wrong
if thread is bunching up under material increase the tension of the needle thread if the bottom thread is loose then increase the bobbin thread tension
each thread result for above or below material will indicate which thread to alter the tension on
ordinary drop feeds are not suited for sewing leather,ideally a needle feed or machine with a walking foot mechanism is best suited.if you are stuck with this machine only,there are a couple of things which may help.on some of the juki ddls there is an adjusting screw and locknut on top and in the middle of the arm of the machine .turn needle by hand wheel to bdc and loosen this screw and turn clockwise slowley!
this will raise the presser foot very slightly,so when the feed dog is at tdc it can improve the feeding .
spear point needles are reccommended also.
one other idea,but you need a qualified mechanic to do this is to alter the feed timimg slightly on the eccentric on the top shaft.as the needle is entering the fabric,slow the timing down so the needle enters the leather just as the material starts to move.
hope this helps!
cheers kev w 07725903110
Are you using the correct type of needle? have a word with your needle supplier and explain the problem. Different threads and different thickness material need different top and bottom tension adjustments.
Can I suggest sew one thickness material at a time with tension adjustments for that thickness. Then change the tensions and do a batch of thicker material.
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