Method and apparatus for providing overload protection in compre

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...

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264268, 2642976, 264310, 425136, 425149, 425150, 425154, 425166, 425453, 425457, 425809, B29C 4308, B29C 4318, B29C 4358

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active

059321555

ABSTRACT:
A method and apparatus for making plastic articles utilizing a plurality of tools, each of which is moved by cams and includes a nitrogen cylinder wherein provision is made for catastrophic overload prevention. For catastrophic overload prevention, one of the cams is supplied by a top plate and held in normal fixed position by a plurality of nitrogen cylinders. Abnormal movement of the top plate is detected and the machine is stopped. For predictive overload protection, a load cell is positioned at the off load position of one of the cams and any excessive load provides a signal for an alarm, interrupting the feeding of plastic charges and stopping the machine.

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