| 摘要 |
PROBLEM TO BE SOLVED: To mechanically control a curve of a slide operation-crank shaft angle, and improve a press slide operation by providing a press driving system, and a differential gear operationally connected to the driving system. SOLUTION: A link spider 70 is connected to a link pivot 71 by a pivoting pin, and pivoted around the pin as a shaft. The link pivot 71 is pivoted around a shaft (position z), and is pivoted by a link main gear connecting tool 69, which is moved by a main gear. The tool 69 pivots the link pivot 71 forward/ backward for driving the link spider 70, and controls a spider differential gear for causing the velocity change of the output differential gear. The curve of slide operation-crank shaft angle is controlled to obtain a slide operation curve required for drawing operation and the like. The velocity, position, and slide dwell of the press slide are varied and maintained for a given time, or for a given period of the driving shaft rotation.
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