Roving machine for producing a roving and method for piecing a fiber sliver
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United States of America Patent
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Jan 19, 2016
Grant Date -
Jul 31, 2014
app pub date -
Jun 29, 2012
filing date -
Jul 1, 2011
priority date (Note) -
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Abstract
A roving machine and method for producing a roving from a fiber sliver has at least one spinning station with a vortex chamber, an infeed opening for the fiber sliver, and a roving forming element in the form of a spindle that has an inlet port and extends at least partially into the vortex chamber. The vortex chamber is associated with spinning nozzles through which air can be guided into the vortex chamber to impart, after a piecing process, a protective twist to the fiber sliver in the region of the inlet port. The spindle has a draw-off channel via which the roving provided with the protective twist is drawn out of the vortex chamber. Piecing nozzles are additionally associated with the vortex chamber, wherein each of the piecing nozzles has a flow direction which is aligned in the direction of the inlet port of the spindle.
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