Domestic sewing machines typically have a single tension control unit for the upper thread. This is fine for sewing with a single needle, but is often insufficient when using twin or triple needles. Have you noticed how overlockers have separate tension controls for each thread? We need the same on a sewing machine!
I have recently run into tension trouble sewing with a twin needle using different types of thread. Different threads require different tension, but a single tensioning unit can only deliver one and the same tension for both threads. I could solve the problem there using an extra tensioner normally meant for winding the bobbin, but this is not a general solution.
I’m looking for ideas!
Yes, this is a sewing machine, not a weaving loom. 🙂 But I get carried away.
This is more like it! May be a ted too many threads, but a good idea to arrange the tensioners on a rail like that.
Just the one needle, but how sweet!! 😀
Ah, that’s more like it! Two needles, one bobbin, basically the same as our domestic twin needle solution, except for the separate tensioners. Notice how they are arranged in one unit back to back.
But nothing can beat this beauty:
She’s got her curlers on! 🙂 This 12-needle machine uses just a single bottom thread. Because of the large overall width, it could not be a bobbin, but the thread came in tightly wound cops that fitted directly into the shuttle. But I think it would have been much easier to use a transverse shuttle – it can cover any width easily. Back to the weaving loom – the original inspiration for a lockstitch sewing machine!
But back to our domestic machines. Since we don’t really want to modify the needle clamp, the easiest thing is to use standard twin or triple needles.
It is important to separate the threads as they come to the needles, but many machines only have a single thread guide near the needle clamp. That’s easily fixed – a new guide can be made out of some wire and fitted instead of the old one. Here is what I’ve done for my New Home 580:
I think it should be sufficient separation, the threads can pass through the other guides together, as long as they have their own tensioners. Each machine already has one tensioner, so if I make some sort of a clip-on unit with two tensioners on it, I’ll be able to move it from machine to machine. As well as the spool pins! Hmmm… Now, where was that thinking cap?