Medium-Term Leveling (Optical and Feed-Based)
topic
Former Zellweger equipment used an optical measuring device built into the protective cover above the doffer, measuring infrared light reflection from fibres on the main cylinder over the full width. Rieter card leveling operates as medium-to-long-term closed-loop leveling using a microprocessor, with the feed measuring device recording batt cross-section fluctuations and electronically adjusting feed roller speed. The chute filling level is an additional control parameter.
Role
Medium-term leveling addresses variations in the 3–20 m range that long-term leveling is too slow to correct. The combination of medium and long-term leveling provides comprehensive count control across all relevant wavelengths.
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