Method and device for needle selection in a circular knitting machine, particularly for selection needle by needle

摘要

A circular knitting machine in which the inactivation or activation of the vertical jack (3) standing below each needle (2) is controlled by a horizontal jack (11) located in a radial position relative to the cylinder (1) within a ring structure (10) which surrounds and is rigid with the machine cylinder (1) and contains, in a number equal to the number of needles (2), radial grooves in which the horizontal jacks (11) slide radially and horizontally to be selected by electromagnetic retention devices (14) with which each jack is provided and which are mounted on the ring structure (10); when energized, the electromagnetic devices (14) retain the horizontal jacks (11) in their outer position to activate the corresponding needles (2), whereas when not energized, the electromagnetic devices (14) allow the horizontal jacks (11) to return to their inner position by the effect of a thrust spring (12), so leaving their corresponding needles (2) in the rest position.