Apparatus on a direct roving winder for contactless detection of the actual diameter of the roving package and a direct roving winder with such an apparatus and also a method for controlling a roving winder and a method for controlling a spinning appliance

A method for controlling a roving winder for the production of a package of rovings, comprising the following steps:

• guiding rovings via a winding spindle rotating at a selected r.p.m. and a cross-winding device onto a package;
• providing a laser sensor including a transmitter and a receiver for laser radiation;
• ascertaining the distance of the laser sensor from the package surface by means of the radiation from the transmitter to the package surface and back to the receiver;
• ascertaining the momentary diameter of the package from the ascertained distance of the laser sensor from the package surface;
• controlling the distance of the cross-winding device from the package surface by means of the ascertained momentary diameter of the package;
• and
• controlling the r.p.m. of the winding spindle depending on a chronology of values of the actual diameter of the package.

A method for controlling a roving winder for the production of a package of rovings, comprising the following steps:

• guiding rovings via a winding spindle rotating at a selected r.p.m. and a cross-winding device onto a package;
• providing a laser sensor including a transmitter and a receiver for laser radiation;
• ascertaining the distance of the laser sensor from the package surface by means of the radiation from the transmitter to the package surface and back to the receiver;
• ascertaining the momentary diameter of the package from the ascertained distance of the laser sensor from the package surface;
• controlling the distance of the cross-winding device from the package surface by means of the ascertained momentary diameter of the package;
• determining the titre of the wound rovings from growth of the package diameter;
• and
• controlling the r.p.m. of the winding spindle depending on the determined titre, in order to avoid titre variations.

A method for controlling an apparatus for the spinning of rovings, in which glass filaments spun by a spinning position are wound to a package by means of a direct roving winder, comprising the following steps:

• providing a laser sensor including a transmitter and a receiver for laser radiation;
• ascertaining the distance of the laser sensor from the package surface by means of the radiation from the transmitter to the package surface and back to the receiver;
• ascertaining the growth of the package diameter from the chronology of the distance of the laser sensor from the package surface;
• and
• controlling the temperature of the spinning position depending on the ascertained growth of the diameter of the package.

A method for controlling a roving winder, in which a plurality of roving packages is produced on at least one winding spindle, comprising the following steps:

• providing a laser sensor including a transmitter and a receiver for laser radiation for each package;
• ascertaining separately the distance of each of the laser sensor from the associated package surface by means of the radiation from the transmitter to the package surface and back to the receiver;
• ascertaining the growth of the diameter of each of the packages from the chronology of the distance of the laser sensor from the package surface;
• comparing the values of package growth ascertained for the individual packages;
• and
• producing a signal when the difference between the values of package growth ascertained for the individual packages exceeds a threshold value.