Most likely, it's because a domestic machine is not intended nor made to sew heavy projects like car mats. It is a strain on your machine and may eventually burn up the motor or damage some gears. The material in the car mat and its thickness is damaging the thread causing it to break. Also, the fact that you cannot lower the presser foot prevents the tension from activating properly. Are you getting globs of thread when it stitches? This is an indication. This is a case where the project is too much for the machine.
SOURCE: sewing with walking foot
Take the needle out and run the machine for a while with the walking foot fitted. Refit the needle and try again but only turn the machine over by hand to see if the problem has cleared. If no luck it sounds like the walking foot timing needs adjusting.
SOURCE: Cotton snapping
not trying to be a "know it all" I swear , but have you tried either loosening up the tension just a pinch ? and or , (speaking from experiences w/ the same machine) a bigger needle or try "driving " a little slower , I am a sewing leadfoot and sometimes the combination of some or all of these results in a most not cool breaking/ curling snarling shredding of the thread ! hope this either helps or makes you laugh !
SOURCE: thread shreds with Pfaff
I have the book on that machine as well and I have had that problem. Here is what had happened to me: I was soooooo tired of that shreading thing that I took a flashlight and aimed it up the nose of the machine by the lightbulb and fould there to be a nice little rats nest wrapped around the take-up lever and the needle bar. I spent the next three hours getting to that nest with the skinniest and longest tools I could find. Oh it is was fun!
SOURCE: timing my pfaff 332 sewing machine
There are two parts to the sew hook on that machine. The outer part has the hook point that grabs the thread off the needle. Then there is an inner part which has a post in the center of it that the bobbin case fits on to. The inner part should be held in place with an arm that has a bump on it. It keeps the inner part from spinning around. Sometimes this arm slips loose and a notch in the inner part of the hook assembly slips out from under the knob on the arm. If this is what is happening, you need to loosen the screw holding the arm in place and reposition the notch of the inner part of the hook back under the bump on the arm. There needs to be clearance between the notch and the bump for the thread to pass between the two. And the bump should be in line with the needle when it is in its lowest position.
If this doesn't solve the problem you need to take the machine in for repair.
Wayne
SOURCE: Anna had this problem with her Pfaff 332 sewing machine, I do too
I believe that the bobbin case holder has become unlatched, for lack of better terminology. I have one of these machines, and my first experience with one was exactly as you are describing. A friends grandmother brought it to me because it kept breaking needles and wouldn't complete a stitch.Put the bed table in the lowered position, leaving the free arm exposed. Remove your needle, presser foot, and bobbin case, leaving the bobbin door open. Next remove the two screws that hold in the feed plate, and remove the feed plate. Looking down into the bobbin area, manually turn the bobbin case holder. There is a small slot in the top of the bobbin case holder, look for it as you turn. A small latch protruding from the bed plate is supposed to be clipped into that slot, and if the latch is still there, you likely will not be able to rotate the holder into place: This is good news, it means nothing is broken. Loosen the three screws (two silver on the top of the bed plate and one black in the area where the feed plate goes) which hold the bed plate in place, but do not remove them. You should be able to lift the bed enough to get the holder into place, and then set the bed back down and tighten the screws. Reassemble everything, throw in a new needle and see how it goes!
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