# Patent

## Title
Yarn cylinder

## Abstract

The yarn cylinder includes a hollow cylindrical body; a groove, almost annularly disposed around the cylindrical body, being formed with four sections of teeth to define four segments; and a plurality of recesses, located beside the groove one by one, each recess having a tapered end, and all tapered ends being toward the same direction.

## Background
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to filatures.
2. Related Art
Please refer to FIGS. 1-4, which show a typical yarn cylinder. The yarn cylinder is made of plastic and is formed with a groove 1. The groove 1 is of a C-shape with about 350 degrees. Two ends of the groove 1 are separately formed with two guiding slants 11. The groove 1 is formed with four sections of teeth 30, 40, 50, 60 to define four segments 3, 4, 5, 6. Directions of two adjacent sections of teeth 30, 40, 50, 60 are different from each other.
A division line 300, 400, 500, 600 is defined between every two adjacent sections of teeth 30, 40, 50, 60. Directions of two adjacent sections of teeth 30, 40, 50, 60 meet at an angle. However, the groove 1 with the guiding slants 11 is too narrow, so yarn is not easy to enter the groove 1. And the guiding slants 11 do not have enough holding ability.
SUMMARY OF THE INVENTION
An object of the invention is to provide an improved yarn cylinder, which allows yarn to easily enter the groove and can firmly hold yarn.
To accomplish the above object, the yarn cylinder of the invention includes a hollow cylindrical body; a groove, almost annularly disposed around the cylindrical body, being formed with four sections of teeth to define four segments; and a plurality of recesses, located beside the groove one by one, each recess having a tapered end, and all tapered ends being toward the same direction.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a typical yarn cylinder;
FIG. 2 is a longitudinal sectional view of the typical yarn cylinder;
FIG. 3 is a cross sectional view of the typical yarn cylinder;
FIG. 4 is a top view of the typical yarn cylinder;
FIG. 5 is a perspective view of the invention;
FIG. 6 is a longitudinal sectional view of the invention;
FIG. 7 is a cross sectional view of the invention; and
FIG. 8 is a top view of the typical yarn cylinder.



DETAILED DESCRIPTION OF THE INVENTION
Please refer to FIGS. 5-8. As shown, the improved yarn cylinder of the invention includes a hollow cylindrical body. A groove 1 is almost annularly disposed around the cylindrical body. The groove 1 is of a C-shape and formed with four sections of teeth 30, 40, 50, 60 to define four segments 3, 4, 5, 6. A plurality of recesses 31 are formed beside the groove 1 one by one. Each recess 31 has a tapered end and a guiding slant 11, and all tapered ends are toward the same direction. This arrangement allows yarn (a) to easily enter the groove 1 and can firmly hold the yarn (a).
Please refer to FIG. 7. The yarn (a) can be easily wound in the groove 1 through the guiding slants 11 of recesses 31. The yarn (a) cannot escape from the groove 1 because the four sections of teeth 30, 40, 50, 60 in the four segments 3, 4, 5, 6 and the recesses 31 compose an interlaced holder. By the arrangement of the invention, the yarn (a) can be easily guided into the groove 1 but the yarn (a) is hard to escape from the groove 1.
It will be appreciated by persons skilled in the art that the above embodiment has been described by way of example only and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims.

## Claims

1. A yarn cylinder comprising:
a hollow cylindrical body;
a groove, almost annularly disposed around the cylindrical body, being formed with four sections of teeth to define four segments, and having a first side and a second side, wherein the first and second sides are straightly parallel, a distance of the first and second sides is substantially identical, and the teeth are crookedly toward an inside of the groove; and
a plurality of recesses, located on the first side of the groove one by one, each recess having an acutely tapered end and a guiding slant, and all tapered ends being angled toward the same direction which is different from a direction of the teeth, wherein the second side of the groove is provided with no recess.