Arrangement for adjusting the mass of thermoplastic gobs for a molding machine

US4369053A · kind A · utility

Assignee

• Hermann Heye

Inventors

• Kurt Becker · Bad Eilsen, DE
• Gerhard Geisel · Bückeburg, DE
• Siegfried Schwarzer · Oberasbach, DE
• Hans-Georg Seidel · Rinteln, DE

Key dates

• Filing date: Oct 19, 1981
• Grant date: Jan 18, 1983
• Expiry date: Oct 19, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B11/16
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An arrangement for adjusting the mass of gobs of thermoplastic material, especially molten glass, which are deformed in a positive manner in the mold of a molding machine by means of a pressing member which penetrates into the gobs. A distance transducer mechanically detects the maximum depth of penetration reached by the pressing member during each molding-machine operating cycle. The distance transducer is connected with a metallic actuating element for a differential transducer, at whose output is produced an electrical signal proportional to the maximum penetration depth reached, this signal being applied to an automatic regulating circuit which adjusts the setting of a dosing structure which controls the mass of the gobs. The regulating circuit includes, at the output of the differential transformer and connected one after the next, a measurement transducer, a maximum-value storage, a sample-and-hold circuit, a summing junction, a PI- or PID-regulator and an adjusting motor which drives an adjusting member for the dosing structure, as well as a feedback transducer. The feedback transducer is connected to the PI- or PID-regulator via a rotary-angle-to-voltage converter. A contr…