B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/75
B21D 22/20 (2006.01) B21D 24/00 (2006.01) B30B 1/14 (2006.01)
Patent
CA 1120335
ABSTRACT OF THE DISCLOSURE A power metal-forming press of the underdrive type having a pair of laterally spaced rocker shafts journaled in the base. A set of vertical pull rods are connected to arms at the ends of the shafts for reciprocating the press slide. Driving subassemblies are provided at the near side and far side of the press each including a main drive gear carrying an eccentric. A pitman pivotally engaging the eccentric has a short arm which is coupled via a connecting link to a rocker arm on one of the shafts. The pitman also has a long arm extending generally in the opposite direction, the end of the long arm being guided with respect to the frame along a generally longitudinal path. The long arm is so angled with respect to the connecting link under conditions of bottoming of the slide that upon rotation of the main drive gear the short arm traces a generally elliptical path having a major axis which bears an acute angle to the bottoming orientation of the connecting link. As a result the slide moves relatively slower as it approaches its bottoming position and relatively faster as it leaves its bottoming position.
375757
Enprotech Mechanical Services Inc.
Macrae & Co.
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