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US 4,369,550 AGranted
Method of levelling out variations of a fibre sliver and apparatus for implementing the method
AssigneeRieter Machine Works, Ltd.
InventorHanspeter Meile
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AssigneeRieter Machine Works, Ltd.
InventorHanspeter Meile
Estimating the term…
An autolevelling drawframe for levelling out staple fibre slivers in the spinning mill operation, in which deviations of the sliver weight (linear density) from the preset desired value detected are processed into correcting signals and are transmitted to a correcting member, which adapts the input speed of the drafting arrangement. The correcting signal transmitted is generated from the product of a voltage proportional to the rotational speed of the main motor and a voltage determined by the deviation in linear density. The apparatus consists of a computer (34,41; 60,41; 67,71) for computing the correcting signal, which computer is connected electrically with the correcting member (48), with a transducer (20) transmitting the voltage proportional to the rotational speed of the main motor, and with means for generating the voltage determined by the deviation in linear density. The computer can consist of a control device (36) and a multiplicator (41) or of a microprocessor (71) (digital computer).
Method of levelling out variations in linear density of a fibre sliver drafted from a plurality of fibre slivers in a drafting arrangement of an autolevelling drawframe, the linear density of which sliver is measured at the exit of the drafting arrangement and is compared with a preset value, a signal proportional to deviations in linear density being transmitted to a control device, which in turn transmits the adaptation commands using an adaptation value to adaptation means, which adjust the sliver input speed using a differential gear arrangement driven by the main motor and by a control motor, until the preset value is reached, characterized in that the adaptation value transmitted to the adaptation means (48) is formed by the multiplication product of a voltage proportional to the rotational speed of the motor and of a voltage determined by the deviation in linear density.
Dependencies are inferred from the claim text.