Found this on another page http://www.fixya.com/support/t2568348-necchi_4757_need_know_way_needle- with many thanks to Paul Howell.I've modified it slightly for the 931 ...Thread the machine from the spool, left to the guide on top/rear, over the top towards the front, around the tensioner down through the large channeled guide below it and up (picking up the thin wire guide on its way) around the take-up lever from right to left, down through the semi-hidden guide, through the needle clamp guide and thread the needle through the front to the back.
SOURCE: 6022 necchi sewing machine
There is a site that has instructions with how to thread the machine properly. Click here for the www.sewusa.com threading section
SOURCE: NECCHI, model 4795. Thread bunches up at bobbin.
it sounds like the thred tenshion is to loos or the timing has sliped a little and its off a bit this can also happen with wear on the gears or just a loos fixing letting the timing slip back a bit,
SOURCE: How do I thread my necchi Lydia type 544 sewing machine
Threading guide - http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Necchi_Sewing_Machine_Threading/Necchi_542_544_threading_Diagram.htm
Make sure the presser foot is up when threading any sewing machine.
SOURCE: Threading a necchi 537l
There are several Necchi models (and loads more) threading guides shown here, it may well be you can find one very similar to help.
Threading Guides
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