CONTROL SYSTEM FOR THE RECTILINEAR VERTICAL RECIPROCATING MOVEMENT OF THE NEEDLE-HOLDER BEAM IN A NEEDLING MACHINE

摘要

The rectilinear vertical reciprocating movement is transmitted to the needle-holder beam (2) of the needling machine by means of a crank mechanism preferably made up of two connecting rods (3, 3') hinged to the support (1) of said beam. According to the invention two further horizontal connecting rods or auxiliary connecting rods (7, 7'), mounted in the two sides of the needle-holder beam support and each having an end hinged to the related main connecting rod (3, 3') and the other end being joined to the structure of machine by means of a sliding block (9, 9') and a couple of conjugate profiles (10, 10'; 11, 11'), one of which being fixed and the other one being mobile are used. The profiles form a rolling coupling so that each sliding block, that is hinged to the related ancillary connecting rod, slides during the crank mechanism running between two extreme axial positions and contemporaneously each profile (10, 10') of the ancillary connecting rod rolls on the fixed conjugate profile (11, 11') for remaining constantly in contact therewith along lines that are always located on the horizontal plane passing by the contact line and by the centre of main connecting rod small end.