Documentation for a workshop “Machine Knitting” at wdka.nl. In this workshop we will explore possibilities of tuck, skip, lace, Jackard, and other knitting techniques. In former blog posts is documented how an image is uploaded using my own software together with the board made at a session of http://knitic.com/ in Bruxelles.
With an accessoire it is possible to knit with different colors using the double bed.
A so called color changer.
The way to knit an image in a double layer, avoiding the loose thread of Nordic Knitting can be seen in this video of the Japanese knitlabo: (Double bed jacquard knitting)
Using the Due to transfer the images and not the img2track (see below) the procedure of sending the right image had to be found.
After the normal setup of the double bed the settings are:
Main bed slider: both PART buttons,KC(II)
Double bed slider: left PR slider, circular knobs press and turn, bottom lever: center.
But just sending the image as done in other posts, like the single bed TUCK, slip, lace and Jackard is not possible.
Exploring the patterns stored inside the KH-940 it could be seen that knitting from right to left prepared the pattern at the top side of the needle board (first bed), while going from left to right stayed on this line. The second color did the reverse in color: the “black” in the pattern was at the bottom side of the needle board, and maintained while knitting to the left.
So this meant that the “pixels” of the image should be twice as long (two tours of knittings), but also that the tours (of left and right) had to be alternating in base-color.
The prepareation process can be shown in these images:
Normal image, the pixels are two high, which still gives half height as shown below. So multiply again by 2 (Using the setting “Nearest neighbor – preserve hard edges” stting in the scaling menu of Photoshop.)
Making the image 4 times the height, 2 x 2 pixels in height.
The next step is making the lines alternating in base color. I used for this a second layer with black lines of 2 pixels high. These pixels were selected and with the selection the alternating horizontal lines of 2 pixels were inverted:
This resulted in a real “encoding”, the text cannot be read anymore:
Using this in the Processingg sketch and sending it to the KH-940: (horizontal direction inversed)
This result was knitted: (the knitting is one layer thick, front side has the image, back side the stripes.
The reason to mutliply by 4 and not 2 is because the setting is the PART mode, with one tour knitting, you knit only half. If you multiply just by 2, you get a diminished height:
As can be seen, the bind off isn’t really perfect. The trick for binding of is to switch to another color, knit this color further in round knitting, getting the knitting of the machine and crochet the stitches together of the last row of the knitting. Then get rid of the last color. In the references is the video.
one bit images
around the Jacquard:
Software: i use my own program (Procesing sketch and Arduino Due code), and having this fun of discovering the image encoding, but you could also use img2track, like in the video, this uses the adafruit hack to transfer images, free for max 100 needles.