My first encounter using a ribber cast on comb for open edge single bed knitting was in using the Passap machine. Its use for this purpose is possible on other brands as well. It provides an easy way to deal with waste yarn and weight application on ribbed fabrics. I like using ribber cast on combs when knitting single bed to distribute weight evenly across pieces if needed. A second comb may be inserted as knitting grows. Weights may then be removed and moved up, and so on. Unevenly distributing weight causes elongated stitches in those areas, and makes shaped knitting unpredictable unless the ratio of weight to width of knitting is maintained. Here the topic is using the ribber comb in single bed open cast on and hanging hems.
My Japanese machines are used chiefly for production of single bed items, so usually they are ribber free. Balancing the ribber on older KMs can be fussy, so once the ribber is up, working, and well balanced, my recommendation is to leave it in place if it is going to be used on a regular basis.
For this technique use a cast on comb appropriate for your knitting machine’s gauge ie 4.5mm, 5mm, etc., brand is not relevant, only tooth spacing is. It is possible to cut ribber cast on combs into different widths for use when knitting is planned on fewer stitches than those accommodated by their available commercial widths. In the yarn used in my swatches, I found knitting the first row at stocking stitch tension created large enough stitches for later picking up and hanging the hem. Test your yarn, if necessary use a looser tension for the “cast on” row, and evaluate any inside hem “drop” if looser stitch size is used.
The knit carriage will not clear the comb properly because of the location of its brushes, etc. For the “cast on” row, exchange the sinker plate on your knit carriage for that normally used with the ribber. The first photo below shows the approximate location for the comb during the first row knit. Needles are centered between the teeth, the teeth themselves line up with gate pegs. The comb needs to be manually held in place, since there is no opposing bed in use to help balance it. The latter would ease the process in wider pieces of knit. The ribber sinker plate has no brushes or wheels to anchor knitting on the knitting bed; any rows knit single bed using it, will need to have needles brought out to hold position prior to knitting each row for all stitches to be formed properly
the comb in positiona pass is made slowly with the ribber sinker plate in place the comb is droppedbring all needles out to hold position knit one more row, returning to starting positionchange sinker plate on knit carriage, proceed with hemthe comb will then need to be lifted up to close the hemfirst rest a knitting needle or similar tool on the open hem lift comb up enclosing knitting needle, add weightslift comb perpendicular to needles, move it forward sightly for a better view of stitchesneedles (red dot) need to enter the stitches through their center (yellow highlight), not their side (orange highlight) or stitches will later drop; push needles through the center of each stitch on comb continue across the bed
remove wire from comb, lift it up and offremove weights and knitting needle; wrap cut yarn end around last needle on that side pick up from row below to fill in “missing single stitch” on opposite sidecomplete hem with looser joining row, return to standard tension, continue knitting
To achieve joining hems in this manner with the ribber in place, though possible on both beds, it is quickest to cast on the back bed (Passap) or on the knit bed (Brother, etc.). Hold the appropriate ribber comb with the bump(s) up facing you, so that the teeth line up as shown above, with the flow combs/ gate pegs, and the needled can come through the gaps. Leave the wire in, hold the bump(s) against the front bed/ ribber, and tilts the comb against the back/ knit bed. Hold the comb high enough to take the lock or carriage across. Take the locks / carriages across to opposite side, drop the comb and weigh it, knit 2 rows on Passap before using strippers. In Japanese kms drop the ribber, switch sinker plates, and continue to knit on the main bed.
For other purposes and an edge similar to a “weaving cast on” executed on Japanese machines use EON for the “cast on row”, then bring into work and add the rest of the needles prior to knitting the second row.