Patent ID: 6071196
Filing Date: 2000-06-06
Classification: B21J

Abstract:
An adjustment device for a forging machine for adjusting the shank length of small metal items such as screws and rivets produced by the forging machine, said forging machine having a frame, a driven shaft (17) and a matrix (38), said adjustment device comprising:a cam (10) driven by said forging machine shaft (17);a slide (29) slideably moveable on rails (29') fixed to said frame;a first lever (19) pivotally connected to said frame and having first and second ends, said first end (19') being in following contact with said cam;a first rod (11) having a first end cooperating with the second end of said first lever (19)a second lever (12) having a first end pivotally connected to said slide (29) and a second end pivotally connected to said first rod (11);a second rod (18) having a first end pivotally connected to a second end of said first rod (11) and a second end pivotally connected to said frame;a third lever (15) having a first end fixedly connected to said second end of said second rod (18); andan extraction bar (36) articulated to a second end of said third lever (15) and having an alternating rectilinear motion in said matrix (38) equal to the shank length of the metal items.