Technical Field The present invention relates to a bobbin for cheese dyeing, and more particularly to, a cheese dyeing bobbin which is chiefly used for dyeing yarn.

Background Art The most important things for cheese dyeing is to uniform thickness of yarn bundles wound around upper and lower bobbins which are laid one over another in a multi-stage, and to make lateral surfaces of the junction between the upper and lower bobbins closely contact, to thereby uniform a flow of dyeing liquid. However, as shown in FIG. 3, since the body of a conventional cheese dyeing bobbin 1 is of a conical shape, a yarn winding pressure is not only non-uniform but also junctions of yarn bundles 5 at the upper and lower bobbins 1 do not closely contact each other. Accordingly, gaps between the yarn bundles 5 are formed. As a result, dyeing liquid is not uniformly sprayed. That is, the yarn is spotted at places where a dyeing liquid pressure is large or small.

Disclosure of the Invention To solve the above problems, it is an object of the present invention to provide a cheese dyeing bobbin which is chiefly used for dyeing yarn in which a yarn winding pressure is not only- uniform but also junctions of yarn bundles at the upper and lower bobbins closely contact each other, to accordingly form no gaps between the yarn bundles and uniformly spray dyeing liquid, and to thus make the yarn not spotted at places where a dyeing liquid pressure is large or small. To accomplish the above object of the present invention, according to an aspect of the present invention, there is provided a bobbin for cheese dyeing whose body is of a cylindrical shape, the cheese dyeing bobbin comprising: a number of wave-shaped convex portions and wave-shaped concave portions which are formed at the upper and lower ends of the bobbin at a certain interval; and a number of vertical ribs and a number of obliquely crossed ribs which are formed at a certain interval on the surface of the body of the bobbin, wherein when yarn bundles are laminated in a multi-stage, thickness of the yarn bundles is not only uniform, but also, the wave-shaped convex portions and the wave-shaped concave portions which are formed in the upper end of the lower bobbin body are sequentially attached to the wave-shaped concave portions and the wave-shaped convex portions which are formed in the lower end of the upper bobbin body, respectively. Preferably, the number of vertical ribs have slipprevention portions, respectively, and the number of obliquely crossed ribs have rhombus throughholes, respectively. Accordingly,, lateral surfaces of the junction of the upper and lower yarn bundles closely contact each other and thus the yarn can uniformly receive a sprayed pressure of dyeing liquid, to thereby greatly contribute for improving quality of dyed products.

Brief Description of the Drawings The above and other objects and advantages of the present invention will become more apparent by describing the preferred embodiment thereof in detail with reference to the accompanying drawings in which: FIG. 1 is a perspective view of a bobbin for cheese dyeing according to the present invention; FIG. 2 is a cross-sectional view of upper and lower cheese dyeing bobbins according to an embodiment of the present invention; and FIG. 3 is a cross-sectional view of conventional cheese dyeing bobbins.

Best Mode for Carrying out the Invention Hereinbelow, a cheese dyeing bobbin which is chiefly used for dyeing yarn according to the present invention will be described with reference to the accompanying drawings. Referring to FIGs. 1 and 2, a bobbin for cheese dyeing whose body 1 is of a cylindrical shape, according to the present invention, includes a number of vertical ribs Ia having a slip prevention portion Ia-I and a number of obliquely crossed ribs Ib having rhombus throughholes 3 which are formed at a certain interval on the surface of the body 1 of the bobbin. Also, the cheese dyeing bobbin includes a number of wave-shaped convex portions 2 and a number of wave-shaped concave portions 2a which are formed at the upper and lower ends of the bobbin body 1. When a number of bobbins are laid one over another, the wave-shaped convex portions 2 of one bobbin are closely coupled with the wave-shaped concave portions 2a of another bobbin. The cheese dyeing bobbins are used for dyeing yarn bundles. If yarn is wound around a bobbin body 1 of cylindrical shape, the upper and lower portions of the yarn bundle are uniform in thickness. Then, if a number of cheese dyeing bobbins which become yarn bundles are laminated for cheese dyeing in a multi-layer, the wave-shaped convex portions 2 and the wave-shaped concave portions 2a which are formed in the upper end of the lower bobbin body 1 are sequentially attached to the wave-shaped concave portions 2a and the wave-shaped convex portions 2 which are formed in the lower end of the upper bobbin body 1, respectively. Accordingly, lateral surfaces of the junction of the upper and lower yarn bundles 5 closely contact each other and thus when dyeing liquid is sprayed, a spraying pressure of the dyeing liquid is uniformlyabsorbed. Thus, the yarn bundles 5 are dyed in uniform color. As described above, a number of vertical ribs Ia having slip prevention portions Ia-I are formed at a certain interval and a number of obliquely crossed ribs Ib having rhombus throughholes 3 are formed between the vertical ribs Ia at a certain interval. Also, a number of wave-shaped convex portions 2 and a number of wave-shaped concave portions 2a are formed at the upper and lower ends of the bobbin. Also, when a number of bobbins are laid one over another, the wave-shaped convex portions 2 of one bobbin are closely coupled with the wave-shaped concave portions 2a of another bobbin. As a result, a yarn bundle wound around the bobbin of a cylindrical shape can uniformly receive a sprayed pressure of dyeing liquid, to thus obtain a color uniformity and thereby greatly contribute for improving quality of dyed products.

Industrial Applicability As described above, the present invention provides a cheese dyeingbobbin of a cylindrical shape which is used for dyeing yarns in uniform color. As described above, the present invention has been described with respect to a particularly preferred embodiment. However, the present invention is not limited to the above embodiment, and it is possible for one who has an ordinary skill in the art to make various modifications and variations, without departing off the spirit of the present invention. Thus, the protective scope of the present invention is not defined within the detailed description thereof but is defined by the claims to be described later and the technical spirit of the present invention.