When switching between N/N and tuck/ tuck on the ribber it is not necessary to switch the tucking lever from its up position to the lower one. The ribber will knit every row when used in either of of these settingsIt is possible to knit this type of fabric using color separations such as those seen for one type of DBJ where color one for each design row knits 2 rows, followed by color 2 for corresponding design row also knitting for 2 rows. Each color may be drawn and programmed once, followed in turn with elongation X2 on both punchcard and electronic machines. I prefer to work with the elongated images, believing it makes it easier for me to correct errors or knitting problems, should they occur. This color separation is the default on Passap. In Brother electronics it would need to be hand done and programmed. It is best to start with simple shapes. This triangle series has been used in several of my previous posts. The chart shows the transitions in the process
Brother DBJ settings using tuck on either bed, not addressing hand needle selection on the ribber for production of reversible fabrics. The yellow color highlights cam settings that require changing by hand for every other pair of knit rows, and making the changes with each color change. With the exception of the bottom 2 the same settings were used in some of my brioche variation experiments. The resulting fabric, knit in reverse order from chart (top setting down to first). The dropped stitches happened when I did not notice the ribber weight was resting on the floor, with no resulting weight on the fabric. There are single repeats of each motif. Two more possible DBJ variations
A full range of DBJ variations of the same repeat, including ones using slip stitch and shared in a previous post, executed in both one and 2 colorsPassap knitters have the option of arrow keys and stitch type on the back bed that make fabrics possible with ease that are daunting to reproduce on Brother machines. There is a category search on my blog that will lead to a collection of posts on the topic of knitting with 2 carriages selecting patterns.
I have often considered the possibility of using 2 coupled knit and rib carriages for some of my patterns but found it limited knit width because of carriage stops on the ribber bed, the unwillingness to have my ribber carriages fly off the bed, and the added limitation imposed when both carriages are selecting needles. Now that setting changes were required every 2 rows on the ribber I found a solution of sorts. It is one of those try at your own risk tips, but for me it made several of the last swatches in brioche achievable far more quickly and accurately.
As in any knitting with pairs of carriages, when needle selection is happening from opposing sides, the turn marks need to be cleared on each side of the machine as the opposing carriage begins to move across the needle bed to avoid breaking the belt.
I happen to be knitting present swatches on my orphaned 930, which still knits producing interesting sounds. It came with no carriages. I am actually using a knit carriage from a 910 and one from my 892E punchcard machine, with a magnet glued to the proper location facing the rear rail. I removed the stopper pins from either side of the ribber bed, placed lace lace extension rails on both sides as well as the color changer with all change buttons released as seen in this illustration. On the left, as the carriages move beyond the end of the needle bed, the return signal lever is tripped, making a characteristic noise. A that point the turn mark on the left has been cleared, and it is safe to operate the carriages from the right toward the left
The right side of the machine is more problematic. The extension rail will store the knit carriage safely, but the ribber carriage has to move out enough so without its stop it would fall to the floor. My solution was to jerri rig an extension the appropriate height so the ribber carriage could slide out as much as needed while being supported. I was able to knit the hundreds of rows required for many swatches with no problem other than operator errors. Here the pair of carriages on the right are seen resting far enough off the machine to clear the belt, at an adequate height for them to slide off and on easily. At first I secured the connecting arm to the connecting pin with an elastic “just in case”, but that proved unnecessary.
I have been asked lately about the lili setting used in all my ribber carriage illustrations (center position). I tend to use that as a default to prevent errors and for consistent quality in my ribbed fabrics, especially if matching gauge ie in garment pieces or bands is needed. That said, for the carriage to travel far enough on the right in this set up, the slide lever had to be used on I. The plastic tray helped reach the appropriate height, and made for easy slide off and on. There are a few minutes of maneuvering when setting up first selection row. As always it is good to begin with familiar yarn and previous experience with double bed fabrics.
Some of my own operator errors are due to the fact that I still am not used to the fact that the 930 appears to revert to factory defaults with each new design entered, that I have to remember to switch from isolation to all over, that the image is reversed on the knit side like on punchcard machines unless the reverse key is used. I spent decades using the 910, where once the selections were made and once the pattern variation buttons were set, that became the default until buttons were changed for specific applications.
The 2 pairs of carriages may also be used for vertical striper backing using lili buttons on Brother machines, and for both slip and tuck variations of same. I will add information in a separate post. More “patterns” are possible as well, emulating some of the Passap possibilities for its back bed settings.