Core fiber detecting method and device in core yarn spinning
AssigneeMurata Kikai Kabushiki Kaisha
InventorHarutoshi Sawada
Life of this patent
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Abstract
The presence/absence of a core fiber in a core yarn is reliably detected to prevent production of a core fiber-free core yarn. In a method for producing a core yarn C by wrapping a fiber bundle S around a core fiber F, the core yarn C is spun with a core fiber F content being changed from that of normal spinning for a predetermined time period after the start of spinning, in order to detect whether the core fiber F is present. The core yarn C may be spun with a core fiber made of a drawn elastic yarn to detect whether the core fiber is present based on a thickness fluctuation of the core yarn that is caused by slackening the core yarn.
Claims28
A core fiber detecting method in core yarn spinning for use in a method for producing a core yarn by wrapping a fiber bundle around a core fiber, wherein the core yarn is spun with a core fiber content being purposefully changed from that of normal spinning for a predetermined time period after spinning is started after a suspension, in order to detect whether the core yarn contains the core fiber.
A core fiber detecting device in core yarn spinning for detecting whether a core fiber is present, the device being included in an apparatus for producing a core yarn by wrapping a fiber bundle around the core fiber, wherein the device comprises content changing means for spinning the core yarn with a changed core fiber content, and the core yarn is spun with the core fiber content being purposefully changed from that of normal spinning for a predetermined time period after spinning is started alter a suspension, in order to detect whether the core yarn contains the core fiber.
A method of core yarn spinning by wrapping a fiber bundle around a core fiber comprising:
- setting a content of the core fiber to a normal content;
- spinning the core yarn with the content of the core fiber set at the normal content;
- for a predetermined time after the spinning the core yarn after a suspension, purposefully changing the content of the core fiber to a second content;
- spinning the core yarn with the content of the core fiber set at the second content;
- and
- detecting the presence of the core fiber after the spinning the yarn with the parameter set at the second content.
A core fiber detecting device for an apparatus producing a core yarn by wrapping a fiber bundle around a core fiber comprising:
- means for changing, for a predetermined time after spinning is started after a suspension, a content of the core fiber from a normal content to a second content;
- means for detecting the core fiber when the core yarn is produced at the second content.
Dependencies are inferred from the claim text.