To avoid this, before trying to sew a thread chain, raise the presser foot, have the needles in the highest position, and use your long bent serger tweezers, or a similar long, slender object, to sweep under the front of the presser foot, all of the way to the back of the presser foot, and it should pull all of your threads to the back, in the correct position for beginning to stitch. If you do not have a thread chain formed, and have accidentally threaded it in the wrong order, the needle threads get trapped in the lower looper thread, breaking your threads, and ruining any possibility of stitches. This is to simplify threading, great for beginner sergers! Notice the color coded tension dials and dots, next to the thread guides. The black box on the lower right corner, is the on off switch, which turns on the serger light, & motor. It cannot be adjusted during sewing, it requires opening the front plate, which risks you touching moving parts (the loopers, or tangling up the threads accidentally), so always close the door after resetting the differential feed. The differential feed knob must be unscrewed, to adjust it, and must be screwed tight, after adjustment, to make sure it stays in place. Singer Quantumlock 4 differential feed is silver knob on far right, right below the stitch length knob. Singer Quantumlock 14U286B Overlock Serger notice the lower looper is accessed by removing the freearm nose cone, you turn the handwheel until the needles are down, and the lower looper is in this position, to thread this end of the looper, then turn the handwheel again, to get the lower looper point, to go out the other side of the needleplate, to finish threading the thread guide in the end of the looper point. Quantumlock,4 thread serger set up to sew with 4 threads, any time,which has differential feed, to sew ruffles, or to prevent knit fabrics from stretching, as it is serged, and while it can sew a 2 thread, 3, thread, or 4 thread stitch, I will probably mostly use it for 4 thread stitches, unless I want to use the differential feed on a 2 or 3 thread serger stitch. I like to keep a Singer 3 thread serger set up to sew with 3 threads, but also keep a Singer
I have owned, & serged with many Singer sergers, particularly out of the Singer 14U serger series.
Singer Qantumlock 4 was used to sew the black rolled hem shown in the photo, using the rolled hem needleplate on the left Singer's 1987 video showing the features of their Ultralock Serger for the home sewer, says it serges at a speedy 1,500 stitches per minute! If you are used to newer sewing machines, that will feel fast to you, but it is slow, compared to an industrial serger, which is usually over 2,000 stitches per minute, often as fast as 6,000 stitches a minute. Presser foot has been removed for visibility of needleplate.
Singer Quantumlock with freearm noseplate (hiding the knob for stitch width adjustments), and both the rolled hemmer needleplate, and the regular overlock and flatlock needleplate, with original Singer trimmer catcher.
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