US 4,408,447 AGranted

Method of and system for controlling the operation of open-end spinning machines

AssigneeVyzkumny ustav bavlnarsky

InventorsJiri Sloupensky, Miloslav Tyl

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Abstract

The invention relates to a method of and a system for controlling the operation of open-end spinning machines comprising a plurality of spinning units, which method is based upon a permanent cyclic communication of a central unit of the system with the individual spinning units. According to the invention, at a given instant, a single spinning unit only is connected to the central unit of the control system, said central unit being supplied with information data about the condition of the spinning unit connected thereto while said central unit simultaneously transmits instructions for said spinning unit, the other spinning units operating automatically on the basis of the stored instruction the validity of which lasts for the time of one control cycle.

Claims5

Dependent claims

In a method of controlling open-end spinning machines having a plurality of spinning units, each comprising a sliver supply device, a spinning rotor, a yarn take-off device, a spooling device and a device for remedying thread breakages, the last-mentioned comprising rotor cleaning and yarn spinning-in means, the operation of the individual spinning units being controlled by a central control unit, the improvement wherein the operation of all the spinning units, in both a normal spinning process and a process of remedying thread breakages, is entirely controlled by the central control unit within successive control cycles the time of duration of which is shorter than the minimum response time of executive members of the spinning unit, by control signals generated on the basis of evaluation of at least one of the information signals from the just controlled spinning unit and on the basis of sequence of programmed thread breakage remedying steps from a central storage unit of the central control unit, said control signals controlling the operation of the executive members of the spinning unit within a time interval between two subsequent control cycles while within the period of communication between the central control unit and the respective spinning unit, the other spinning units performing the operation determined by the last received instruction the validity of which lasts for the time of the control cycle, irrespective of any change in the information signal within the time interval between the two subsequent control cycles.

In an apparatus for controlling open-end spinning machines having a plurality of spinning units, each comprising a sliver supply device, a spinning rotor, a yarn take-off device, a spooling device and a device for remedying thread breakages, the last-mentioned device comprising rotor cleaning and yarn spinning-in means based upon the principle of yarn end return into the spinning rotor, the spinning machine being associated with a central control unit for controlling the operation of the individual spinning units, the improvement wherein the central control unit comprises a control circuitry to which control circuits of the individual spinning units are parallel-connected via an outlet bus bar, an inlet bus bar and a cycle timing conductor, each of said circuits including a D-type flip-flop series-connected to a control bus bar of the central control unit, at least one AND gate connected by its one inlet to the D inlet of the D-type flip-flop, by the second inlet to a signal outlet of the spinning unit, and by its outlet to the inlet bus bar, a storage unit connected to the outlet bus bar, to the Q outlet of the D-type flip-flop, and via a decoder to executive members of the spinning unit, a timing pulse generator connected to the control circuitry and designed for generating control cycles for controlling the operation of the spinning units in periodical control intervals the lasting period of which is shorter than the minimum response time of the executive members of the spinning unit, and

a central storage unit connected to the control circuitry and designed for storing data about conditions of the individual spinning units in the preceding control cycle, the control circuitry being arranged for entirely controlling the operation of all the spinning units, in both normal and abnormal conditions, by control signals generated by processing at least one of the information signals from the just controlled spinning unit with reference to information from the central storage unit.

Dependencies are inferred from the claim text.