Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1994-12-19
1996-02-20
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264161, 2643289, 264334, 425139, 425142, 425165, 425556, 425DIG51, B29C 4538, B29C 4540
Patent
active
054926580
ABSTRACT:
The present intention intends to operate an ejector which carries out gate cut and product ejection in an injection molding machine, at optimal speeds, respectively. According to the present invention, a control unit for controlling hydraulic or electric drive means for operating one or more than one ejector pin comprises operation speed setting means for gate cut and another operation speed setting means for product ejection. Such a structure enables to carry out gate cut by operating an ejector unit controlled by an ejector unit operation speed setting means for a gate cut and, subsequently, to carry out a product ejection from metallic molds by operating the ejector unit controlled by another ejector unit operation speed setting means for product ejection. The ejector unit is set at a comparatively high operation speed for gate cut so that no gate trace will remain, and at a comparatively low operation speed for product ejection so that no cracks will be generated in the product.
REFERENCES:
patent: 4208176 (1980-06-01), Salerno
patent: 4878824 (1989-11-01), Hara
patent: 5330693 (1994-07-01), Takada
patent: 5356283 (1994-10-01), Hamada et al.
patent: 5439371 (1995-08-01), Sawaya
Inage Toshio
Kobayashi Motohiro
Miyajima Shoji
Ohno Masakazu
Sato Sumio
Heitbrink Jill L.
Sankyokasei Kabushiki Kaisha
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