Drafting arrangement for spinning machines
AssigneeRieter Machine Works, Ltd.
InventorRudolf Wehrli
Life of this patent
Estimating the term…
Abstract
The drafting arrangement is provided with a guide element between the front roller pair and the operative unit formed by an apron and a roller. The guide element is disposed for guiding a length of fiber between the roller of the operative unit and the front roller pair. The guide element may be of D-shaped cross-section, circular cross-section or in the form of a curved plate. Where cylindrical, the guide element may also be rotated.
Claims18
A drafting arrangement for reducing the thickness of a fiber structure delivered to a spinning stage of a spinning machine for producing relatively fine yarns comprising
- a first operative unit having a pair of rollers defining a converging space for guiding a continuous length of fiber therebetween;
- a second operative unit adjacent said first unit, said second unit including a large friction roller and an endless apron partly embracing said roller to cooperate therewith to deliver a length of fiber to said first unit;
- and
- a guide element interposed between said units for guiding a length of fiber therebetween, said guide element being disposed in a converging gap between said roller of said second unit and one roller of said first unit to deflect the length of fiber over said element and between said units.
A drafting arrangement comprising
- a first pair of rollers forming a nip for passage of a continuous length of fiber to be drafted;
- an operative unit for feeding a continuous length of fiber to said nip of said first pair of rollers, said unit including a rotatably mounted large friction roller and an endless apron opposite said roller for guiding the length of fiber therebetween;
- and
- a guide element interposed between said pair of rollers and said unit for guiding the length of fiber to said nip, said guide element being disposed in a converging gap between said roller of said operative unit and one roller of said pair of rollers to deflect the length of fiber therebetween and over said element.
A drafting arrangement comprising
- a plurality of bottom rollers including a large friction roller;
- a swing arm pivotably mounted above said rollers;
- a plurality of top rollers mounted on said swing arm in opposition to said bottom rollers;
- an endless apron disposed about one of said top rollers in facing and partly embracing relation to said large friction bottom roller to form an operative unit to guide a length of fiber therebetween;
- and
- a guide element disposed in a converging gap between said large bottom roller of said operative unit and a first of said bottom rollers to guide and deflect the length of fiber over said element to a nip between said first bottom roller and an opposed one of said top rollers.
A drafting arrangement comprising
- a first pair of rollers forming a nip for passage of a continuous length of fiber to be drafted;
- an operative unit for feeding a continuous length of fiber to said nip of said first pair of rollers, said unit including a rotatably mounted large friction roller and an endless apron opposite said roller for guiding the length of fiber therebetween;
- and
- a guide element interposed between said pair of rollers and said unit for guiding the length of fiber to said nip, said guide element being spaced from said roller of said operative unit to strip the length of fiber therefrom for conveyance to said nip of said first pair of rollers.
Dependencies are inferred from the claim text.