Patent ID: 6269673
Filing Date: 2001-08-07
Classification: B21D,B21J,Y10T

Abstract:
A reciprocating mechanism, comprising:a seat body including therein a longitudinal first guiding groove, a second guiding groove intersecting said first guiding groove, and a crossing space at the intersection of said first and second guiding grooves;a longitudinal first slide member disposed slidably and reciprocatingly in said first guiding groove across said crossing space and having a longitudinal cam member extending longitudinally of said first slide member; anda second slide member mounted slidably on said seat body along the direction of said second guiding groove and incorporating a cam follower which extends into said crossing space to contact said cam member, said cam follower being movable to-and-fro along said second guiding groove when said cam member reciprocates along said first guiding groove, thereby moving reciprocatingly said second slide member along said second guiding groove,wherein said first slide member includes a plate member having two opposite substantially straight longitudinal sides extending along the direction of said first guiding groove, two opposite transverse ends transverse to said longitudinal sides, and a cam support face between said longitudinal sides, said cam member projecting from said cam support face in the form of a bent ridge which has a first section that extends longitudinally adjacent to one of said longitudinal sides and one of said transverse ends, a second section that extends longitudinally adjacent to another one of said longitudinal sides and another one of said transverse ends, and a third section that is curved and that inclines gradually from said first section to said second section, said cam follower including a contact roller which is mounted on said second slide member and which extends into said crossing space adjacent to said cam member, said contact roller having a rolling face in contact with said cam member,wherein said cam follower further includes a thrust roller which is mounted on said second slide member and which is in rolling contact with one side of said cam member opposite to said contact roller, said contact roller being biased to press said cam member against said thrust roller, andwherein said second slide member further includes a first shaft mounted rotatably thereon, said first shaft having a first part extending into said contact roller, and a second part extending outwardly of said contact roller, said first part being eccentric to said second part so as to place said contact roller in a position eccentric to said second part, said second slide member further including a push rod which has one end connected to said second part and which has an opposite end extending radially outward away from said first shaft, and a biasing unit mounted on said second slide member to bias said opposite end of said push rod so that said first shaft is turned in one direction and moves eccentrically said contact roller toward said cam member.