Knitting are two types; warp knitting and weft knitting. So, primarily classification of knitting machines are weft knitting machine and warp
Knitting Machinery
The Difference Between Weaving, Knitting, and Crochet - Warped Fibers
Knitting, Textile, Yarn & Patterns
Knitting Archives - Textile Blog
Different Types of Knitting Machines You Should Learn About - Stintelli
Knitting, Knitting Types, Advantages and Disadvantages of Knitting, Properties of Knitting, by Textilestudycenter.com
Different Types of Knitting Machines You Should Learn About - Stintelli
Knitting: Knitted Fabrics - Textile School
Different Types of Knitting Machines and Their Applications Archives - Textile Learner
List and Classification of Knitting Machines - Textile Learner
circular knitting machine guide - Hanma
Kniterate: The Digital Knitting Machine by Kniterate — Kickstarter