Method and apparatus for the qualitative assessment and classification of yarns during a yarn clearing process
AssigneeZellweger Uster AG
InventorPeter Aemmer
Life of this patent
Estimating the term…
Abstract
For the purpose of establishing the clearing limit of a yarn clearing system, the yarn faults are determined, classified and counted. The parameters reference length and sensitivity are set in relation to the number of the corresponding clearer cuts on an orthogonal coordinate system. A clearing profile is thereby generated which represents the functional correlation between the quantity of all theoretically possible combinations of the yarn clearer setting parameters, and which reveals the number of clearer operations to be expected during clearing of the yarn for any combinations of the setting parameters.
Claims14
A method for establishing the clearing limits for a certain type of yarn to be cleared in production, comprising the steps of experimentally testing a sample of the same type of yarn to determine for a multiplicity of sets of clearing limits the corresponding numbers of yarn clearing interventions, generating by interpolation a clearing profile for the yarn which represents the relation between all possible combinations of the clearing limits and the corresponding number of yarn clearing interventions, and using said clearing profile to select the optimum compromise between yarn quality and the number of clearer interventions for the yarn to be cleared in production.
A device for qualitatively assessing yarns, comprising:
- measuring heads for scanning the cross-section of yarns to be assessed;
- evaluation units for receiving and preprocessing signals from the measuring heads;
- and
- a control device including a memory in which preprocessed yarn signals from the evaluation units are collected, and a processor unit for processing the stored yarn signals relative to a multiplicity of pairs of values of setting parameters by comparing the yarn signals with a plurality of different classification limits that form sample values and recording each instance in which a classification limit is exceeded to indicate a yarn clearing operation, and for generating a clearing profile that correlates frequency of yarn clearing operations relative to said different classification limits, said processing unit illustrating said clearing profile in the form of a three-dimensional graph on a screen connected to the control device.
Dependencies are inferred from the claim text.