Pfaff 2040 Tiptronics bobbin case rotating out of position
The bobbin case part with the bobbin spindle that is held from rotating by a spring finger at the top of the case has started rotating with the main bobbin case which is causing jams and broken needles. Have taken it apart and repositioned the spring holder to keep the spindle part from rotating but it keeps doing it. Have checked for foreign materials and lubrication and it seems okay. The two parts seem to rotate freely within each other for the most part but a bit "sticky" at times. Once the spindle part of the case rotates and cause the spring finger to be sprung out of normal position, does the spring finger need to be replaced to work properly again? Does the entire bobbin assembly need to be replaced?
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Only thing is to remove the bobbin, bobbin holder if you can, the feed dog cover plate, and then, using a magnifying lamp and a fine pointed pair of tweezers, try and locate the bits of cotton and pull gently out while rotating the hand wheel slowly, rocking it back and forth. Use an air blaster can to blow fluff out, clean, and oil. Including inside the bobbin case.
First, make sure there is no debris and scraps of thread in the bobbin area. I'm sure you did that already. I assume you also tried it with another thread just to be sure. I would suspect that the timing went out of whack. The machines depend on a synchronization between the needle motion and the bobbin action underneath. I once had a Singer that slipped and I had to reset the timing. If it is the timing synch problem then it would happen consistently and not work sometimes and then not work other times. G
Locate the bobbin access panel to the right of the presser foot. Place thumb tip in the oval hole and pull to the left, (It might also tip up, but I doubt it.) Reach in and lift and grasp the little lever on the bobbin case, pull it out. Remove bobbin from case. Select the thread you want to fill the bobbin with. Place it on the thread spindle. Pull thread trough the small round tension disc on top of the machine and back toward the short spindle on the right top of the machine. If your bobbins have holes.. thread a hole and place the botton on that short spindle. Slide the bobbin and spindle toward the metal "fence". Loosen the hand wheel by turning the center knob counter clock wise. Grasp the little thread on the bobbin and start winding a few revolutions with you holding the thread. Stop and clip that short thread close to the bobbin then continue winding until full.
When the bobbin is full. Return the hand wheel knob to it's original position. Slide the bobbin winder spindle away from the "fence" and remove the bobbin. Place the bobbin in the case with the bobbin facing you... the thread when pulled should rotate the bobbin itself clockwise (VERY Important!) Hold the lever open and replace the bobbin.
For your convenience I have located this PDF for your machine. (be patient, it takes a while to load)
on lockstitch machines with rotary hooks the base[the bit the spoolcase fits in]is held in place by a retaining finger,tip machine back and you will see a long finger with a right angle lug sticking out approx 4/5mm .loosen the screw holding the finger only slightly and spin the base till the top of the base is at the 12.00clock pos.[it will help if you take needle plate off]the lug fits into the cut out of the base.then tighten finger screw and try.
if base is jammed you will need a mechanic to dismantle hook and repair and retime the machine.
hi! well! everything is gonna be fine,make sure the thread was wine on clockwise rotation as shown on figures if this similar to your bobbins anyway this is just a sample how to set up bobbinsthe thread is inserted on slot of bobbins case to acquire a tension tread. then hold bobbins on spindle while the needle of machine is on higher position.as shown on figuresthen inset this on shuttle hook case as shown on figures.then after bobbins was set up on shuttle case the thread of bobbins will hook up by the thread of needle by rotating the handwheel manually by your hand be sure the top thread was set up properly.just let me know if the procedure can help.
The bobbin case is in the wrong position to lock into the shuttle holder.Try instead of holding the the release lever of the bobbin case open, instead position the bobbin case finger to the up position and insert the bobbin case by pushing it in with your thumb. You should feel or hear it snap into position. You may have to rotate it slightly to get the finger in the proper position.