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A cable reel with a positioning mechanism includes a reel casing having a chamber therein; a cylindrical receptacle having a circumferential tracing line groove formed on a sidewall of the cylindrical receptacle; a winding plate having a pivot hole thereon and a guiding groove formed on an interior

A cable reel with a positioning mechanism includes a reel casing having a chamber therein; a cylindrical receptacle having a circumferential tracing line groove formed on a sidewall of the cylindrical receptacle; a winding plate having a pivot hole thereon and a guiding groove formed on an interior wall within the pivot hole, wherein the winding plate is pivotally mounted on the cylindrical receptacle through the pivot hole; a communication cable wound against the winding plate; a swirling spring connecting the reel casing with the winding plate; and a ball bearing movably disposed in the tracing line groove.

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1. A cable reel with a positioning mechanism, comprising: a reel casing having a chamber therein; a cylindrical receptacle having a circumferential tracing line groove formed on a sidewall of the cylindrical receptacle; a winding plate having a pivot hole thereon and a guiding groove formed on

1. A cable reel with a positioning mechanism, comprising: a reel casing having a chamber therein; a cylindrical receptacle having a circumferential tracing line groove formed on a sidewall of the cylindrical receptacle; a winding plate having a pivot hole thereon and a guiding groove formed on an interior wall within the pivot hole, wherein the winding plate is pivotally mounted on the cylindrical receptacle through the pivot hole; a communication cable wound against the winding plate; a swirling spring connecting the reel casing with the winding plate; and a ball bearing movably disposed in the tracing line groove and the guiding groove. 2. The cable reel with a positioning mechanism of claim 1 wherein the reel casing is comprised of a main body, a first casing, and a second casing, the main body is a cylindrical hollow structure, and wherein the first casing and the second casing are the congruent halves, the main body, first casing, and second casing form the enclosure of the invention herein. 3. The cable reel with a positioning mechanism of claim 1 wherein two terminals of the communication cable protrude from a first aperture and a second aperture on the reel casing respectively. 4. The cable reel with a positioning mechanism of claim 1 wherein at the center of the first casing there is provided a spindle for mounting the winding plate, the cylindrical receptacle is placed on the second casing corresponding to the spindle, and one end of the swirling spring is secured to the spindle. 5. The cable reel with a positioning mechanism of claim 1 wherein the winding plate has a plate body and a winding ring protrudes from two opposite sides of the plate body. 6. The cable reel with a positioning mechanism of claim 1 wherein the swirling spring is disposed in a spring seat, a plurality of protrusions corresponding to a plurality of snapping holes at bottom of the spring seat are formed on winding ring of the winding plate, the protrusions are inserted into the snapping holes so that the spring seat is secured to the winding plate at one side and the winding plate and the spring seat can therefore rotate synchronously, the spring seat is also disposed in the chamber of the reel casing and is pivotally mounted on the spindle through the central hole. 7. The cable reel with a positioning mechanism of claim 1 wherein a spring piece is mounted in the pivot hole of the winding plate, the spring piece flexibly touches the ball bearing to restrain the ball bearing in the tracing line groove. 8. The cable reel with a positioning mechanism of claim 1 wherein the tracing line groove comprises a first trench, a first dropping portion, a positioning portion, a guiding face, a second trench, a second dropping portion, a third trench, and a third dropping portion, and wherein the first trench surrounds sidewall of the cylindrical receptacle, the first dropping portion, which has a relatively higher left side and lower right side, is disposed in the first trench and wherein the second trench surrounds sidewall of the cylindrical receptacle in a parallel manner with the first trench, the guiding face has a lower side connected with the second trench, the second dropping portion, which has a relatively higher right side and lower left side, is disposed in the second trench, and wherein the third trench is connected with joint between the second trench and the second dropping portion, the third dropping portion connects the other side of the third trench and the first trench.