Abstract A process for winding yarn into a cylindrical-bodied substantially straight-ended package wherein the yarn is traverse wound in layers of helical coils on a bobbin by traversing the yarn axially through successive stroke lengths in repeating time periods to form a package and wherein two successive stroke lengths form a traverse cycle. The improvement includes the steps of progressively decreasing the stroke length to a first value then increasing the stroke length to a second value within 50 percent of the duration of each of the time periods, while varying the helix angle at least twice during a preponderance of the traverse cycles. The winding apparatus for accomplishing this includes a divided barrel cam with sliding portions that are moved axially in concert in a programmed sequence to disperse the yarn laydown at the reversals. Yarn packages of improved formation and stability are wound using the process and apparatus of this invention. The packages are formed of a plurality of layers of helical coils, wherein each coil includes successive helical and reversal portions and are characterized by having at least two inflections in the helical portions of a preponderance of the coils.
A yarn package comprising a plurality of layers of helical coils, each coil having helical and reversal curve portions, said coils being formed by traversing yarn through successive stroke lengths to form the package and wherein a traverse cycle consists of two successive stroke lengths, there being at least two inflections in the helical portions in each of a preponderance of the traverse cycles throughout the package.
Claim 2
Dependent Claim
67 words
A yarn package comprising a plurality of layers of helical coils, each coil having helical and reversal curve portions, said coils being formed by traversing yarn through successive stroke lengths to form the package and wherein a traverse cycle consists of two successive stroke lengths, there being at least two inflections in the helical portions in each of a preponderance of the traverse cycles throughout the package.
Claim 3
Dependent Claim
21 words
The package of claim 1, said stroke lengths being repeatedly decreased to a first value then increased to a second value.
Claim 4
Dependent Claim
15 words
The package of claim 2, said first and second values being constant throughout the package.
Claim 5
Dependent Claim
17 words
The package of claim 2, said second value being constant, said first value varying throughout the package.
Claim 6
Dependent Claim
13 words
The package of claim 4, said second value varying regularly throughout the package.
Claim 7
Dependent Claim
13 words
The package of claim 4, said first value varying randomly throughout the package.
Claim 8
Dependent Claim
13 words
The package of claim 4, said first value varying regularly throughout the package.