Howto thread a twin needle on Janome 6019

Couldn't find a definite answer to your question, but the Amazon Q&A had this (scroll down to the question):

Amazon com NEX Sewing Machine Free Arm 16 Built in Stitch Embroidery...

Remember, to use a twin needle, the space in the presser foot and needle bar need to wide enough to accommodate the width of the twin needle. Also, you will need to use two spools of thread--so you would have to "make-shift" an extra spool holder for your machine.

Make sure the correct length of needle is used and installed correctly. Sometimes it moves slightly out of the holder without falling out but just enough to affect the needle eye position which can cause this kind of problem. For thicker materials use either ball point or denim needles. As last resort the top thread tension might be too tight. Adjust the top thread tension.

try these links for a manual, and the manual should have the information

New Home 535 Manual Instruction


Janome New Home 535 Instruction Manual UK Sewing Machines


New Home 535 Instruction Manual


Newhome Janome model 535 Sewing machine

Although your machine does come with a second spool pin to allow two spools of thread, it does not come with a button or setting for a twin needle. You can probably put one on, but I must caution you that you can only straight stitch on it, because if you try even a narrow zigzag, its likely that one of the two needles will hit the plate and break, and they are expensive.

If you want to try it, I can tell you that you need to buy a twin needle--preferably one with the two needles close together. Put one spool in its regular pin, and the other on the extra spool pin, and thread both threads exactly the same, and at the same time. You will not be able t use a needle threader--you will have to thread them by hand.

Hello

Install the second spool pin.
Place the two spools on the spools pins, one on each spool pin.Make sure that the spools are spinning toward each other.
Thread as for single needle.
Thread each needle from a different spool.
Caution: Make sure that the stitch width is not wide than the twin needle maximum swing. Check that the needles will not hit the throat plate as they swing from left to right and back again on stitches with width.

Happy twin needling
Sewingirl/

Always start from the thread spool pin, install your thread spool to the spool pin & put on the spool holder, pull end of thread to go thru the top thread guide then down to the tension disc(follow the arrow pointer if there is),up to the thread take up lever arm from left to right and down to the needle thru the needle clam guide(just below its needle clam screw)then enter the needle eye from front to back. Turn your hand wheel towards you to bring needle bar down into the bobbin case, keep turning till needle comes fully up, pull out your top thread end & this should bring up the bobbin thread then you be ready to sew.

put the twin needles in the needle holder and then thread the first
needle like you normally would then add a second spool or cone
of thread then thread the machine the same way you did with the first
needle and then thread the second needle

they are only used if your sewing with double needles to hold the
other spool of thread,, most people just buy a thread holder to set
at the back of their sewing machine
here's a link for one for the machine, but a generic spool or cone
holder is just as good,

http://www.sewingmachine-sales.co.uk/twin-needle-spool-pin.htm

you thread it the same as for a single needle
only you add one more spool of thread & thread thru the same
thread guides as the first needle & then thread the second needle
with the thread from the second spool,
also you have to have a spool holder for the second spool

Twin needles can be used on any machine. Just make sure you use the correct presser foot......one that allows both needles to work without hitting the foot. Also.........you cannot zig-zag or use any other fancy stitch with a twin needle.......it is strictly for straight sewing. You have to use 2 spools of thread .....thread your machine with both threads as if they were one thread but separate the threads when you get to the needle. There is no change to the bobbin. Happy sewing. I can't be bothered to go to all this trouble so I just sew 2 rows to get the same look. Ofcourse you have to be very good at sewing perfectly straight seams doing it this way. Try both methods on a scrap and see which method you prefer.