I have a brother kh891 (lucky me - ebay bargain!), and a single bed colour changer (which I have never successfully managed to use - always end up with knitting falling off machine!)... I have just (in a mood of madness) just purchased a kr850 ribber (ebay bargain again!).....and the same seller has a double bed colour changer on offer.... I'm wondering if I should get that too..? I am going to have quite a bit of learning to do with the ribber as it is - but I am fed up of mock - ribs and being limited in what I can and can't knit in my knitting pattern books/magazines all for the want of a ribber! Would I still be able to use the single bed colour changer once I have the ribber set up (presuming by the time I get to any fairisle knitting I would be using the main bed only)? Is the double bed colour changer for those only wishing to knit jaquard (floats knitting in at rear of fabric)......? Or is it the only colour changer you can use once you have your ribber set up - no matter what your knitting plan? Help!
The double bed colour changer is used when you need to change colours regularly with double-bed work such as double jacquard or any striped fabric. You can still use the single bed changer whenever you want to knit multicolour fairisle or slip/tuck patterns on the main bed only.
Because you have the 850 ribber you have the option of birdseye double jacquard as well as normal double jacquard. This means, for one thing, that you can knit up to 4ply double jacquard easily (as I'm doing at the moment) as long as you use the birdseye (lili) setting.
I agree that ribbed welts are so much neater than mock ribs.
I forgot to mention that on punchcard machines you will need special cards for double jacquard. These are generally available at knitting machine shops and are fairly easy to make once you get the hang of them. One of the magazines such as Machine Knitting Monthly or Machine Knitting News may have back copies of articles on how to do this as I learnt to make them from these magazines.