Process and apparatus for feeding fiber in an open end spinning machine

Claim 2

A process for separating and feeding a bundle of fibers by a combing apparatus of an open end spinning machine which process comprises feeding the bundle of fibers to a spinning chamber via a combing zone consisting of two combing rollers spaced apart from one another at a very small interval and rotating in mutually opposite directions, characterized in that feeding and discharging of the fibers are carried out in tangential directions to the combing rollers, the angle of rotation through which a first combing roller acts on the fibers being about 90* 135*, the angle of rotation through which a second combing roller acts on the fibers is about 45* - 135* and diameters of the respective combing rollers are substantially within the range from the average fiber length L to 3/2 L.

Claim 3

The process according to claim 1 wherein V1 represents the surface speed (cm/sec) of the first combing roller and V2 the surface speed (cm/sec) of the second combing roller, and the weight of one single fiber is represented by m (grams), and wherein 50 < or = mV12<700 and 700 < or = mV22 < or = 2000.

Claim 4

The process according to claim 1 wherein the denier of the single fibers constituting the fiber bundle is d, and wherein the gauge between the two combing rollers is in the range of about d/10 - d/100 (mm).

Claim 5

The process according to claim 1 wherein the amount of draft of said combing apparatus is about 10 - 50 times.

Claim 6

A combing apparatus in an open end spinning machine which comprises two combing rollers adjoining at a very small interval and rotating in mutually opposite directions in a casing, providing an exit of a fiber bundle feed pipe on a first combing roller, wherein the angle made by the line from said exit to the center of the first combing roller and the line from the closest point of the two rollers to the center of said first combing roller is about 90* - 135*, and an entrance of a fiber discharge pipe on a second combing roller wherein the angle made by the line from said entrance to the center of the second combing roller and the line from the closest point of the two rollers to the center of said second combing roller is about 45* -135* and said fiber bundle feed pipe and said fiber discharge pipe are disposed in tangential directions to the respective combing rollers.

Claim 7

A combing apparatus in an open end spinning machine which comprises two combing rollers adjoining at a very small interval and rotating in mutually opposite directions in a casing, providing an exit of a fiber bundle feed pipe on a first combing roller, wherein the angle made by the line from said exit to the center of the first combing roller and the line from the closest point of the two rollers to the center of said first combing roller is about 90* - 135*, and an entrance of a fiber discharge pipe on a second combing roller wherein the angle made by the line from said entrance to the center of the second combing roller and the line from the closest point of the two rollers to the center of said second combing roller is about 45* -135* and said fiber bundle feed pipe and said fiber discharge pipe are disposed in tangential directions to the respective combing rollers.

Claim 8

The combing apparatus according to claim 5 wherein the working angle of the combing member of the first combing roller is about 60* - 90* and the number of needle points of said combing roller is about 400 - 600/in2, the working angle of the combing member of the second combing roller is about 60* - 90* and the number of needle points of said combing member is about 200 - 300/in2.

Claim 9

The combing apparatus according to claim 5 wherein said fiber discharge pipe and a rotary spinning chamber are so disposed that an angle A at which said fiber discharge pipe crosses the rotary spinning chamber is about 30* - 50* and an angle B at which said fiber discharge pipe crosses the tangent of the rotary spinning chamber is about 50* - 80*.