C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/14
C03B 9/13 (2006.01) C03B 7/084 (2006.01) C03B 9/193 (2006.01) C03B 9/41 (2006.01) C03B 11/16 (2006.01)
Patent
CA 1166012
ABSTRACT OF THE DISCLOSURE An arrangement for adjusting the mass of gobs thermoplastic material, especially molten glass, which are deformed in a positive manner in the mold of a molding ma- chine 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 regu- lating 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 cir- cuit, a summing junction, a PI- or PID-regulator and an ad- justing motor which drives an adjusting member for the dos- ing structure, as well as a feedback transducer. The feed- back transducer is connected to the PI- or PID-regulator via a rotary-angle-to-voltage converter. A control and display panel is connected to a control logic circuit, the latter connected to the maximum-value storage and to the sample-and-hold circuit, the control logic circuit receiving a machine synchronization signal once per machine operating -1- cycle. A desired-value potentiometer furnishes a desired- value voltage representing the optimum penetration depth for the pressing member, this voltage being applied to the summing junction. A weighting circuit can be provided to take into account the different maximum diameters of differ- ent pressing members which may from time to time be used. The feedback transducer is automatically returned to a mid- dle angular setting thereof. The distance transducer can be constructed in several different ways, disclosed. -2-
388765
Becker Kurt
Geisel Gerhard
Schwarzer Siegfried
Seidel Hans-Georg
Fetherstonhaugh & Co.
Hermann Heye
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