Slide bottom dead center position compensating device

Details Slide bottom dead center position compensating device Slide bottom dead center position compensating device

1996-09-16

1998-02-24

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Mold motion or position control

100 43, 100257, 264 405, 425171, B29C 4358, B30B 1514

Patent

active

057209880

ABSTRACT:
A slide bottom dead center position compensating device comprises an angle sensor for detecting a crank angle, a contact sensor for detecting contact between stoppers on molds or, instead of the contact sensor, a position sensor for detecting that a slide has reached a preset control position near the bottom dead center of the slide, a controller, a setting unit for setting a control condition for the slide bottom dead center position, and a bottom dead center compensating unit. The controller determines a crankshaft rotational angle during the contact between the stoppers or a crankshaft rotational angle under a condition of the slide descending from the control position, calculates a slide compensation amount necessary for making the determined crankshaft rotational angle equal to a control rotational angle preset by the setting unit, and compensates the bottom dead center position of the slide through a bottom dead center compensating unit in accordance with the calculated slide compensation amount. Regardless of whether or not the molds are provided with stoppers, the bottom dead center position of the slide is compensated to be constant in a mechanical press in which the molds are employed for pressing.

REFERENCES:
patent: 4917588 (1990-04-01), Grabener et al.
patent: 5069613 (1991-12-01), Inaba et al.
patent: 5547360 (1996-08-01), Yokoyama

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