W. Schlafhorst Ag & Company

Schlafhorst & Co.

Oerlikon Textile Gmbh & Co Kg

Heribert Kargel

Rolf Haasen

Gregor Kathke

Hans-G&uuml;nter Wedershoven

Hans-Gunter Wedershoven

Heinz G Bender

Hermann Slaghuis

Norbert Veit

Rolf Mayer

Horst Kippe

Dieter Sobotta

A method of operating a textile machine for producing cheeses, at whose workstations ( ) yarn ( ) is unwound from supply bobbins ( ), checked, cleaned of yarn defects and wound onto larger-volume cheeses ( ) during which the yarn defects occurring the winding process in a given yarn length are registered. When a predetermined number of yarn joinders is exceeded within a predetermined reference yarn length, the winding process is stopped and the yarn length with the excessive number of joinders, already wound onto the cheese, is removed from the cheese ( ).

Method of operating a textile machine for producing cheeses

A method for removing both long and short yarn defects at the winding heads of a bobbin winding machine. Following the appearance of a yarn defect, the length of the defective yarn between the time of the appearance of the defect and the time of a subsequent yarn cut is determined. A suction tube is positioned in front of the winding bobbin to aspirate the defective yarn therefrom. The yarn is unwound, the entry of the yarn into the suction tube is determined by means of a sensor disposed therein, and the yarn length unwound from the winding bobbin and entering the suction tube is determined. The unwinding process is stopped at the time when, on the basis of the detected length of defective yarn, a sufficient yarn length has been aspirated into the suction tube so that, upon subsequent insertion of the yarn from the winding bobbin into the yarn end connecting device, the yarn length wound since the appearance of the yarn defect remains outside of the yarn end connecting device for the purpose of being cut and discarded.

Method for removing yarn defects at a winding head of a bobbin winding

A method for monitoring a traveling yarn at a winding station of an automatic winding machine having an electronic slub catcher which produces an AC voltage signal proportional to a dynamic yarn signal responsive to yarn movement and a yarn cutting signal responsive to a fluctuation in yarn dimension outside a predetermined tolerance range includes the steps of producing a static yarn signal responsive to the presence of yarn in the electronic slub catcher, monitoring and evaluating the static yarn signal, producing a separating signal responsive to the absence of static yarn signal due to the absence of yarn from the slub catcher and monitoring and evaluating the separating signal.

Method of monitoring the moving yarn at a winding station of an

The present invention provides a method and apparatus for operating a textile winding machine to wind yarn packages with the capability to verify a reported yarn break situation and to respond accordingly in the event that a yarn break has not, in fact, occurred. A sensing device at a textile winding station senses the travel of a yarn therepast as the yarn is wound from a supply package onto a take-up package. In the event of a yarn break or movement of the yarn beyond the sensing range of the sensing device, the sensor reports the absence of yarn to a control unit. The control unit responds to the signal from the sensing device by stopping the yarn winding operation and implementing a yarn re-establishment operation. The yarn re-establishment operation includes monitoring the position of a yarn end engaging member during its movement toward one of the yarn packages and querying the sensing device at a predetermined time determined in correspondence with the position of the yarn end engaging member as to the presence or absence of yarn. If the presence of yarn is reported, the control unit controls a yarn cutting device to cut the yarn ends and subsequently controls a splicing device to splice the yarn ends together. If the absence of yarn is reported, the control unit controls the yarn end engaging members to dispose yarn ends in the splicing device without any cutting of the yarn.

Method and apparatus for winding textile yarn from a supply package onto

The method and apparatus optically scan the size of a yarn package of a spinning bobbin with a plurality of light transmitters and light receivers and derive defined control processes in accordance with the ascertained size. Bobbins with yarn packages are moved in a given direction of motion at a predetermined speed between a plurality of paired and mutually opposite light transmitters and light receivers disposed one above the other with respect to the given direction of motion for placing at least some of the light receivers into a shadow. At least one of the light transmitters and light receivers are switched on and off in cycles at a predetermined rhythm, order and duration. A signal is delivered to a computer from each of the light receivers placed into a shadow in each cycle by the bobbin. The volume of the applicable bobbin is calculated with the computer from a given time required for scanning one bobbin and from the signals from the shadowed light receivers delivered during the given time. The volume of the tube of the bobbin is subtracted from the volume of the bobbin for determining the volume of the yarn package. Defined control processes are derived and the bobbins are assigned to at least one of specific work stations and specific method steps, as a function of the volume of the yarn package.

Method and apparatus for volume or size detection of a yarn package and

Method of avoiding a formation of ribbon windings when winding a frictionally driven crosswound coil with a wild winding, which includes braking an element rotatingly connected with the crosswound coil with a varying braking force.

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Viersen, Germany

Heribert Kargel