Package Driving & Yarn Traversing

Package Driving

To build a package on a winding machine two motion are basically involved package rotation & yarn traverse.

There are two method of package driving

• Frictional or surface drive in which package is driven by frictional contact with a drum driven by a motor.
• Direct or spindle drive in which package is driven by mounting it on a spindle which is positively driven from the motor.

The drum for package driving are made or various material like steel, aluminum, cast iron etc... The surface of the drum may be engineered by coating or through surface treatment each drum material find it’s suitably for specific applications factor like cost, capability of withstanding abrasive action of yarn during winding. Drum material density, weight & thereby power consumption influence selection of drum material. The drum are usually bellow to reduce weight.

Surface Hardness of Various Drums

 

Winding drum are usually cylindrical in shape. When a come is driven by cylindrical drum, surface speed of drum and cone are equal only at one point. This point is nearest to base of cone approximately at distance are third the come length its base may not remain at some location through package build.

Suppose cylinder drum driving a cone & drum. Diameter is 90mm and diameter of cone at the nose and base at beginning of winding is 15mm to 60mm respectively. Suppose is 45mm. assume that position of this point remain at the same through package build upon winding of 15mm layer of yarn diameter of cone at the nose and base become 45mm and 90mm respectively and diameter at point become 75mm 90 Π become drum surface movement in one rotation.

Method of Yarn Traversing

Different method of yarn traversing are

• Yarn traversing with spirally slotted drum

• This the simplest method of yarn traversing consisting a drum which is provided with spiral slots.
• Yarn traverse to and fro following these slots the depth & width of the groove is so designed that the yarn traverse from one end to the other without any reversal in between.
• The drum also drives the package through surface contact.

When yarn is overlap in drum groove by some mistake that’s caused lapping & causes loss of production as well as yarn wastage in automatic. Winding machine are provided with stop motion to detect drum lapping and stop the spindle. Drum lapping must be removed without damaging drum surface.

• Yarn traversing with reciprocating guide using a grooved cam

• Principle of traverse stock variation angular position slotted breakage change with an increase in package diameter.
• Input from other source in from of a small to and fro motion is given which cause periodic shortening and lengthening of traverse stroke.
• Thus slotted bracket on one hand, change it angular position for traverse length reduction and on the other hand gets rocking motion which lengthens and shortness traverse stroke continuously.

• Yarn traversing with counter rotating blades

• To archives very high traverse speed traversing system without reciprocating masses are attempted which are described in pattern.
• Traversing system with count rotating blade is widely used on commercial machine.

• Yarn Traversing with slit drum

• A hollow drum carries 4 yarn enters the slit at lower end of slit driven passes through hollow portion and then emerge out from slit at upper end subsequently it is wound on the package.
• This method of yarn traversing is used on sewing thread winding m/c.

REF: - fundamentals of yarn winding by Milind Koranne (Woodhead Publishing India in textile)


DOWNLOAD