Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1984-05-10
1985-07-30
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
72 21, 264 405, 425193, B30B 1100
Patent
active
045319014
ABSTRACT:
A transducer arrangement provides a feedback signal which indicates the position of a first part relative to a base and when a second movable part is positioned adjacent the first part the transducer provides a signal indicating the spacing between the two parts. Specifically the transducer provides for spacing control between the two halves of a mold mounted in a press wherein a crosshead moves a substantial distance and carries one part of the mold (the upper half) relative to the lower mold part. Hydraulic actuators act on the lower part of the mold to provide the molding force when the mold parts are close together. The transducer is mounted in a housing and arranged to provide a signal used for controlling the hydraulic actuators to control the spacing of the two molds parts until the mold parts are separated a known amount, after which the hydraulic actuators are controlled by sensing the spacing of one mold half relative to the base of the press.
REFERENCES:
patent: 3994540 (1976-11-01), Petersen
patent: 4184827 (1980-01-01), von Herrmann et al.
patent: 4270890 (1981-06-01), hl
patent: 4318682 (1982-03-01), Larson et al.
Fortenberry J.
MTS Systems Corporation
Woo Jay H.
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