Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1995-03-07
1997-02-04
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264334, 425139, 425556, 425444, B29C 4540
Patent
active
055994865
ABSTRACT:
A method for ejecting a molded product from a die. The method includes advancing an ejector pin from a withdrawn position to a projected position for ejecting a molded product and withdrawing the ejector pin from the projected position to the withdrawn position. At a preset range in at least one of the advancing step and the withdrawing step, the ejector pin undergoes very small reciprocating movements having a period less than 0.1 seconds. When the ejector pin is advanced while very small reciprocation is performed over a preset range in the advancing step, energy due to the projection of the ejector pin is continuously and gradually dissipated. When the ejector pin is withdrawn while very small reciprocation is performed over a preset range in the withdrawing step, the molded product is easily separated from the ejector pin. Accordingly, scattering of molded products and generation of cracks in the molded products can be prevented. Also, the molded product is prevented from being placed back into the cavity. Further, a dwell step may be provided in which the ejector pin is maintained at its projected position while being subjected to very small reciprocation having a period shorter than 0.1 seconds.
REFERENCES:
patent: 5405259 (1995-04-01), Morikita
patent: 5439371 (1995-08-01), Sawaya
patent: 5472335 (1995-12-01), Morikita
patent: 5492658 (1996-02-01), Ohno
Fujishiro Atsushi
Hara Hitoshi
Ishii Yukio
Heitbrink Jill L.
Sumitomo Heavy Industrie's, Ltd.
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