Jacquard mechanism for knitting machines

Abstract

An electromagnetically controlled jacquard mechanism is comprised of a row of interchangeable magnet-unit modules slid onto a shared mounting rod, each magnet-unit module comprising a permanent magnet, an electromagnetic winding and a pole shoe structure. Associated with each magnet unit is a respective jack displaceable between a first and a second position and urged towards second position by a respective biasing spring. When in first position, each jack engages, at a flat holding surface thereon, a flat holding surface on the pole shoe structure of the respective magnet unit, in flat surface-to-surface contact therewith, to maximize the holding force achieved with a given permanent magnet. When the respective coil is briefly energized the resultant flux opposes that of the associated permanent magnet, and the associated jack is pulled by its biasing spring to second position. To facilitate the aforementioned flat surface-to-surface contact, the pole shoe structure of each magnet unit is discrete from the remainder of the magnet unit and somewhat rotatable about the mounting rod and somewhat shiftable in a respective plane normal to the longitudinal direction of the mounting rod, e.g., so that when a respective jack is moved into engagement with the holding structure the pole shoe structure will assume an adjusted position in which flat surface-to-surfce engagement between it and the respective jack is achieved.

Dependencies are inferred from the claim text.