| 摘要 |
Driving subassemblies are provided at the near and far sides 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 shaft. The pitman also has a long arm extending generally in the opposite direction. Upon rotation of the main drive gear, the short arm traces on 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.
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