This section is from the "A Complete Dictionary of Dry Goods" book, by George S. Cole. Also available from Amazon: A complete dictionary of dry goods and history of silk, cotton, linen, wool and other fibrous substances,: Including a full explanation of the modern processes ... together with various useful tables.
Lappet-Weaving. A system of weaving used for producing figures on the surface of cloth by means of needles placed in a sliding frame, called the lappet-frame, which has a sliding bar carrying needles, each with a separate thread for producing certain colors in the pattern. The bar is raised and lowered as required by the action of a wheel grooved according to the pattern to be produced. Sometimes two or more such bars are employed simultaneously when several colors are made to appear in weft-patterns.