Aisin Seiki Co Ltd became the producer of Toyota knitting machines. Production was stopped sometime in the 1980s. There's a story here but I don't know how true it is. Such a shame - Toyota machines had simulknit, a kind of plated double-bed jacquard, which no other machine does.
The following information is taken from a press release from the early 1980s, which was found in amongst some papers during an inventory sale.
Aisin Seiki Co Ltd, founded in 1949 as a manufacturer of automotive parts and sewing machines, has since grown into a principal international supplier of components for engines, driving systems, suspension, brakes, clutches and bodies, as well as home appliances and industrial machinery.
An important member of the Toyota Group, which supplies parts to the Toyota Motor Corporation, Aisin is also known for its strong independence. For home use, Aisin manufactures knitting and sewing machines, electric appliances, and beds: for industrial use, it makes precision metal molds, large transfer machines, and sewing machines.
The full press release is here
Some Elna machines were the same as some Toyota machines, and some were rebadged Knitmaster machines. There's more information on this, and a more detailed compatibility chart here