Zinser Textilmaschinen Gmbh

Franz Machnik

Hans-Peter Weeger

To improve the breaking of a roving between a pressing finger bed and a fully wound bobbin preliminary to a bobbin change, the roving is initially wound around the tube above the upper cone and an unwound roving reserve is formed from at least a half turn on the upper winding cone and the body. A false twist is generated to provide a weakened region so that the roving has a first segment extending from the upper edge of the upper winding cone to the lower edge thereof, a second segment extending to the weakened zone and a third segment extending from the weakened zone to the pressing finger bed. The false twist increases the number of twists per unit length in the first segment and decreases the number of twists per unit length in the second and third segments. The pressing finger is moved along the bobbin periphery and the roving is broken at the weak spot by further movement of the pressing finger relative to the bobbin.

Method of automatically separating a roving upon removal of a bobbin from a roving frame

The roving slubbing at the conclusion of winding of a roving bobbin in a flyer type machine is passed in a descending spiral around the cylindrical body bobbin and then onto the lower winding cone, after it is looped in an overwinding onto the winding tube below the lower winding cone. The winding then passes in a spiral upwardly and is formed into a short spiral segment which is drawn out by a traction on the roving so that the latter will break along the cylindrical body. The bobbin is stable and can easily be handled and transported directly and there is a reduced possibility for the slubbing to come loose, although it remains available to be pulled downwardly at the ring-spinning machine.

Method of and apparatus for winding roving bobbins

Method for changing the bobbins in a roving frame

A roving frame has a drafting frame receiving sliver and feeding rovings to respective roving winding stations. Respective spindles at these stations receive core sleeves on which the roving bobbins are wound for respective flyers. An evaluating and control device is operatively connected to the drive for automatically or on command, operating the flyers at a first gentle speed less than the operating speed and a speed required for automatic capture of roving ends by the core sleeves, automatically or on command, operating the flyers at a second gentle speed less than the operating speed, greater than the first gentle speed and sufficient for automatic capture of roving ends by the core sleeves, and automatically or on command, operating the flyers at a creeping third gentle speed less than the first gentle speed for startup and to position the flyers at selected angular positions.

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Goppingen, Germany

Franz Machnik