US 7,475,531 B2Granted

Drawing frame with aprons entwined around twin output top delivery rollers

AssigneeInstitut fur Textil-und Verfahrenstechnik Denkendorf der deutschen Institute fur Textil-und Faserforschung

InventorsPeter Artzt, Theo Grün, Larisa Ausheyks, Stefan Krawietz

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Abstract

The invention relates to a drafting device with twin top front rollers surrounded by aprons in which the aprons are guided around deflection members arranged above the area facing away from the clamping surface of the front roller pair. In order to achieve a low-friction, brake-free and low-wear running of the aprons, they are guided with only a slight tension around the deflection members. For this, the tendency of the aprons to assume a circular form in the circumferential direction is utilized. This tendency brings about, with the appropriately selected interval between the top front rollers and between the surfaces of the deflection members, the low contact pressure on the surfaces striven for and the low tractive tension in the aprons striven for.

Claims11

Dependent claims

A drafting device for drafting fiber bundles, comprising:

a bottom roller, and twin-type delivery top rollers opposed to said bottom roller;
an apron surrounding each of said top rollers, said aprons defining a clamping surface with said bottom roller for fiber bundles, said aprons having a circumferential cross-sectional shape;
a deflection member associated with each said top front roller around which said aprons run, said deflection members formed as an integral component of a rigid holder;
and
wherein said deflection members are disposed away from said clamping surface at spacing interval between a deflection surface of said deflection members and an axis of said top rollers so as to establish a running path for said aprons that results in a slight deformation of said circumferential cross-sectional shape of said aprons such that said aprons bow outward in said running path between said top rollers and said deflection members and are subjected to substantially only tractive tension resulting from said aprons attempting to assume said circumferential cross-sectional shape.

2 more elements

Dependencies are inferred from the claim text.