Method and apparatus to start interrupt and stop spinning of a fasciated spun yarn

A method of treating yarn breakage in spinning of a fasciated spun yarn on a spinning frame which comprises feeding a bundle of staple fibers, applying to said bundle suction and a fluid eddy in this order, detecting yarn breakage of the yarn thus produced, stopping the supply of feed fibers in response to said detection, stopping the supply of a fluid which provides said fluid eddy and sucking the remaining staple fibers of the fed pneumatically.

In a method of temporarily stopping the operation of a spinning frame which produces a fasciated spun yarn by feeding a bundle of staple fibers, sucking said bundle of staple fibers to pass in a downstream direction, applying a fluid eddy to said bundle, and taking up the resulting yarn, the steps which comprise inactivating the stopping of supply of feed fibers in response to the detection of yarn breakage, stopping said taking-up step, and stopping said fluid eddy and stopping said suction step.

In a method of restarting the operation of a spinning process for producing a fasciated spun yarn wherein a bundle of staple fibers is fed to the process, a suction is applied to a bundle of staple fibers, a fluid eddy is applied subsequently to said suction, and the resulting yarn is taken up, the steps which comprise supplying a fluid to the fluid eedy, and causing the suction to be applied, continuing the feed of said bundle of staple fibers, continuing taking up, detecting yarn breakage and stopping the supply of feed fibers in response to the yarn breakage detection.

An apparatus for producing a fasciated spun yarn which comprises a feed means for feeding in a bundle of staple fibers, having a nip point arranged to nip said bundle of staple fibers, a fluid eddy nozzle having a suction effect at least temporarily on the occasion of starting spinning, the inlet of which is directly connected to a suction tube having a branch pipe connected to a suction apparatus, and means arranged and connected to cut off temporarily a suction air current flowing inside the branched pipe on the occasion of starting spinning.

An apparatus for producing a fasciated spun yarn which comprises means for feeding a bundle of staple fibers, a pneumatic means, a fluid eddy nozzle, a yarn breakage detector, a stop device connected to stop the supply of a fluid to said fluid eddy nozzle, and a stop device connected to stop the supply of feed fibers, said stop devices being actuated by the signal of said yarn breakage detector.

A spinning frame for producing a fasciated spun yarn which comprises means for feeding a bundle of staple fibers along a predetermined path, a take-up device, and a winding device both of which are simultaneously driven by a main motor, a suction tube for sucking said bundle of staple fibers having an opening through which said fibers pass in a downstream direction along said predetermined path, said tube having a branch pipe which is connected to a suction apparatus operated by a pneumatic fan, a fluid eddy nozzle downstream in said suction tube to which a compressed fluid is supplied through a valve controlling a fluid current, a yarn breakage detector and a stop device connected to stop the supply of feed fibers, said stop device being actuated by the signal of said yarn breakage detector.