When the carriage moves over the bed it selects which needles should knit, tuck, transfer or stay in place. The carriage counts the jacks as it moves across the bed, and pushes selected jacks forward. The jacks then push the corresponding needles forward, and depending on the distance they are pushed, the needles are either caught in the knitting path of the carriage or the tucking path. The jacks and needles are secured in their groove by the cover rail and the needle bar.
- Needle bar
- Cover rail