Method and apparatus of detecting a yarn lap on a rotating roll
AssigneeBarmag AG
InventorGerald Berger
Life of this patent
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Abstract
The invention relates to a method and an apparatus for detecting a yarn wind on a rotating roll partially looped by the yarn and associated with a yarn processing apparatus, and which includes a light source for directing to the monitoring range of the roll a light beam, which is imaged as a light strip along a surface line of the roll, and a light sensor with an evaluation device. The sensor detects the light reflected from a yarn wind, which is converted into an electric signal and may then be further processed.
Claims17
A method of detecting a yarn lap in a strand of yarn which continuously advances across a rotating roll, comprising the steps of
- directing a light beam from a light source onto the surface of the rotating roll in a generally axial direction and at an acute angle with respect to the surface of the rotating roll, said light beam having a cross section defining a monitoring range on the surface of the rotating roll which is composed of a narrow light strip which extends axially along a portion of the surface of the rotating roll which is not looped by the advancing strand of yarn, wherein said light beam is reflected from the monitoring range along a predetermined path, and
- sensing stray light which is reflected from said yarn lap formed on the rotating roll by means of a light sensor positioned at a location outside of the light beam and outside of the predetermined path of the reflected light.
A yarn processing apparatus comprising
- a roll rotating about its axis,
- means for guiding a strand of yarn which continuously advances across said rotating roll,
- a light source for directing a light beam at an acute angle with respect to the surface of the rotating roll, said light beam having a cross section defining a monitoring range on the surface of said rotating roll wherein said cross section is a narrow light strip extending axially along a portion of the surface of the rotating roll which is not looped by said strand of yarn, wherein said light beam is reflected from the monitoring range along a predetermined path, and
- a light sensor positioned at a location outside of the light beam and outside of the predetermined path of the reflected light to sense stray light which is reflected from a yarn lap formed in the strand of yarn advancing across the rotating roll.
Dependencies are inferred from the claim text.