B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
B21D43/02—Advancing work in relation to the stroke of the die or tool
B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
B21D43/12—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by chains or belts
Dispositif pour monter les extremites de troncons tubulaires plats convoyes continuellement transversalement pendant la fabrication de sacs ou de sachets
Procede et dispositif permettant d'obtenir, par cisaillement de barres ou de billettes d'acier, des troncons de longueurs exactes destines a etre utilises comme ebauches de formage dans la masse