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Method-and-apparatus-for-adjusting-die-clearance

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Method and apparatus for adjusting die clearance

Details

Inventors: Iguchi, Katsuhiko; Wada, Hidemi; Wakita, Ryuichi;
Assignee: Toshiba Kikai Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Thurlow; Jeffery
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman

An apparatus for adjusting die clearance for an extruder producing a sheet in a die having an adjusting device for adjusting the die clearance between an upper die and a lower die, a measuring device for measuring thicknesses of the sheet at a plurality of positions in the direction of width on the sheet, a setting device for setting desirable thicknesses at the positions, an adjusting data producing device for producing data with respect to die displacement to be adjusted from the measured data and the desirable thicknesses, and control device for controlling the adjusting device in order that the die clearance coincides with the desirable thickness. Rough adjustment can be effected by tightening or loosening the bolts while fine adjustment is achieved by heating the bolts with an electrical heater disposed thereabout.

DETAILED DESCRIPTION Accordingly, the present invention is directed to a method and apparatus for automatically adjusting the die clearance which eliminates the problems mentioned above.
More specifically, the present invention is directed to a method and apparatus for adjusting the die clearance, which measures the thickness of the sheet in the direction of width during molding, detects whether or not the measured sheet thickness attains a predetermined thickness and, when not, automatically operates the adjusting bolts for adjusting the die clearance while considering the abovementioned "mutual interference effect" so as to adjust the die clearance to the predetermined sheet thickness.
Rough adjustment can be effected by tightening or loosening the bolts while fine adjustment is achieved by heating the bolts with an electrical heater disposed thereabout.

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