JP2000044118A - Structure of winding cable into layers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of winding a cable into layers capable of surely avoiding the looseness of the winding. SOLUTION: Cables are wound by two or more layers on a winding drum 3, and an interlaid film 4a having a width D wider than the width H of the winding drum 3 is provided in at least one or between more layers of the cables. In both side ends of the wide interlayer film 4 are rising parts 6 rising along flanges 5 in both side ends of the winding drum 3, and notches 8 are formed in the rising parts 6. The notching direction of each of the notches 8 makes a sharp angle α with respect to the rotational direction of the winding drum 3 when the cable is wound. Thus, the cables are sequentially brought into point- contact with the notch-forming parts from the deep sides of the notches 8 to end edges, shocks generated by the point-contacts are suppressed to be very small to prevent the fallings of the rising parts 6, and the looseness of the winding caused by the fallings of the rising parts 6 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated cable winding structure for winding two or more layers of a cable such as an optical cable around a drum such as a drum or bobbin.

[0002]

2. Description of the Related Art FIG. 7 (a) is a perspective view schematically showing an example of a cable laminated winding structure, and FIG. 7 (b) is a cable laminated winding structure shown in FIG. 7 (a). Is a schematic cross-sectional view taken along the line AA of FIG. (A) of FIG.
In the laminated cable winding structure 1 shown in (b), two or more layers of a cable 2 such as an optical cable are wound around a winding drum 3 such as a bobbin or a drum, and a layer of an interlayer film 4 is provided between each layer of the cable 2. Intervened. Here, the first cable layer formed first on the winding drum 3 and the upper cable layer 2
An interlayer film 4 (4a) having a width D wider than the width H of the winding drum 3 as shown in FIG.
, A wide interlayer film layer is provided, and the width between the second cable layer and the third cable layer is substantially equal to the width H of the winding drum 3 as shown in FIG. A wide interlayer film 4 (4b) is interposed between the third cable layer and the fourth cable layer, and a wide interlayer film 4 (4a) similar to the above is interposed between the third cable layer and the fourth cable layer. Is formed, a wide interlayer film 4a,
The winding drum 3 and the interlayer films 4b having substantially the same width are alternately interposed between the respective layers of the cable 2.

As shown in FIGS. 7 (b) and 8 (a), both ends of the wide interlayer film 4a are wound on the winding drum 3.
And rising portions 6 rising along the flanges 5 at both end sides of the upper portion, and the rising portions 6 are provided with cuts 8. As shown in FIG. 8A and FIG. 8B which is an enlarged view of the cut forming region,
The cut 8 is formed so as to be perpendicular to the rotation direction of the winding drum 3 when the cable 2 and the interlayer film 4 are wound around the winding drum 3.
When wound around, the both side ends of the wide interlayer film 4a are formed at appropriate intervals so as to be able to rise naturally along the flange 5.

Since the interlayer films 4a and 4b are made of a material such as paper which shrinks when dried, the interlayer film 4b having substantially the same width as the winding drum 3 is interposed between all the layers of the cable 2. If this is done, when the interlayer film 4 shrinks due to drying, there is a problem that the cable 2 falls into a large gap generated between the interlayer film 4 and the flange 5 to cause winding collapse. 2, a wide interlayer film layer is formed between one or more layers, and a rising portion 6 that rises along the flange 5 is provided, whereby the interlayer film 4 shrinks due to drying and a large space is formed between the interlayer film 4 and the flange 5. Even if a gap occurs, the rising portion 6 can prevent the cable 2 from dropping into the gap, and can avoid the problem of the winding collapse. .

[0005]

However, when the cable 2 is wound around the wide interlayer film 4a, the cable 2 comes into contact with the rising portion 6, and the rising portion 6 falls down due to the impact of this contact. As shown in FIG. 9A, the rising portion 6 often covers the cable 2. Thus, the rising portion 6
Is covered with the cable 2, as shown in FIG. 9B, a large gap is generated between the interlayer film 4 and the flange 5 due to shrinkage of the interlayer film 4 due to drying. At this time, the cable 2 on the interlayer film 4b could not be prevented from dropping into the large gap, and the winding collapse occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a laminated cable winding structure capable of preventing a rising portion of an interlayer film from falling down and preventing a cable from collapsing. It is about.

[0007]

In order to achieve the above object, the present invention has the following structure to solve the above-mentioned problems. That is, the present invention provides a cable winding bobbin provided with flanges at both ends, in which two or more layers of cables are wound, and the width of the bobbin between at least one or more layers of the cable. In a laminated cable winding structure in which a wider interlayer film layer is interposed, a rising portion of the interlayer film wound around the wide interlayer film layer and rising along the collar of the winding drum has an end of the rising portion. One or more cuts are provided from the edge,
The cut direction of the cut forms an acute angle with respect to the rotation direction of the winding drum when the cable is wound around the winding drum, and is a means for solving the above problem.

[0008] In the present invention having the above structure, the cutting direction of the cut at the rising portion forms an acute angle with the rotation direction of the winding drum when the cable is wound around the winding drum. When the cable is wound around the torso, the cable comes into contact with the notch forming part in order from the deep part of the notch to the edge, which minimizes the impact when the cable contacts the notch forming part. Thus, the rising portion is prevented from falling down, and the problem of the cable collapse due to the falling down of the rising portion is solved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a characteristic rising portion of the laminated cable winding structure of this embodiment. In the description of this embodiment, the same reference numerals are given to the same components as those in the conventional cable lamination structure shown in the conventional example, and the overlapping description of the common portions is omitted.

By the way, in the wide interlayer film 4a shown in FIG. 8, the cutting direction of the cut 8 is perpendicular to the rotation direction of the winding drum 3. In such a case, the cause of the fall of the rising portion 6 when the cable is wound was examined. As shown in FIG. 4, the cable 2 was in line contact with the cutout 8 at a length X, and the line contact was made. Is very large, it was found that the rising portion 6 falls down due to the impact of this line contact.

Therefore, in this embodiment, the cable 2
Is provided with a structure capable of suppressing an impact when the contact is made with the notch forming portion. That is, what is characteristic in this embodiment is that, as shown in FIG. 1A, the cutting direction of the notch 8 provided on both side ends of the wide interlayer film 4a is such that the cable 2 is inserted into the winding drum 3. That is, it forms an acute angle α with the rotation direction of the winding drum 3 during winding. Other configurations are the same as the above-described cable lamination winding structure.

As described above, since the cutting direction of the notch 8 forms an acute angle α with the rotation direction of the winding drum 3,
When the cable 2 is wound around the winding drum 3, the contact position between the cable 2 and the cut forming portion gradually starts from the inner part A of the cut 8 shown in FIG. Point B shown in
Then, the cable 2 comes in point contact with the cut forming portion in order from the deep portion of the cut 8 toward the end edge, such as moving to the point C shown in FIG. Since the impact of this point contact is very small, falling of the rising portion 6 is avoided.

Further, as described above, since the cutting direction of the cut 8 forms an acute angle α with the rotation direction of the winding drum 3, the angle β of the adjacent corner K becomes an obtuse angle. The rigidity of the corner K having the obtuse angle is much higher than that of the corner K having the acute angle as shown in FIG. As shown in FIG. 5, when the corner K is acute, the rigidity of the corner K is weak.
When the wide interlayer film 4 a is wound around the winding drum 3, the rising portion 6 of the wide interlayer film 4 a once rises along the flange 5, but immediately rises from the corner K and rises. As shown in FIG. 6A, the cable 2 is wound around the rising portion 6 that has fallen inward, so that when the interlayer film 4 shrinks significantly by drying, the interlayer 2 The cable 2 falls into the gap between the interlayer film 4 and the flange 5 due to the shrinkage of the film 4 as shown in FIG.

On the other hand, in this embodiment, the corner K
Becomes an obtuse angle to increase the rigidity, so that when the wide interlayer film 4a is wound around the winding drum 3, the rising portion 6 rising along the flange 5 can maintain its standing state, and the wide It is possible to avoid the problem of the collapse caused by the falling of the rising portion 6 when the interlayer film 4a is wound.

According to this embodiment, the rising portion 6
The cutting direction of the cut 8 formed in the winding drum 3 when the cable 2 or the wide interlayer film 4a is wound around the winding drum 3
Is formed at an acute angle with respect to the rotation direction of the cable 2, and when the cable 2 is wound, the cable 2 comes into point contact with the cut forming portion in order from the deep part of the cut toward the end edge. Since the impact is small, it is possible to prevent the rising portion 6 from falling down, and it is possible to avoid the problem of winding collapse caused by the falling of the rising portion 6 when the cable 2 is wound.

Further, as described above, since the cutting direction of the cut 8 forms an acute angle with respect to the rotation direction of the winding drum 3, the angle β of the corner K is inevitably obtuse to increase rigidity. As the wide interlayer film 4 a is wound around the winding drum 3, the rising portion 6 is prevented from turning over and falling inward, and the rising portion 6 maintains a state of rising along the flange 5. It is possible to prevent the problem of the collapse of the winding caused by the falling of the rising portion 6 when the wide interlayer film 4a is wound.

If the angle α between the cutting direction of the cut 8 and the rotating direction of the winding drum 3 is an acute angle, the rising portion 6 at the time of winding the cable and at the time of winding the wide interlayer film 4a as described above. However, even if the angle α is an acute angle, the rising portion 6 may rarely fall. In this case, since the rising portion 6 does not continuously fall over the entire circumference of the winding drum 3, the problem of the winding collapse can be prevented. However, the inventor changed the angle α variously. Then, the presence or absence of the falling of the rising portion 6 was examined, and from this experiment, an angle α capable of reliably preventing the falling of the rising portion 6 was obtained. The optimum angle α was in the range of 45 degrees to 60 degrees. From this, it is more desirable to form the cut 8 such that the cut direction is at an angle within an acute angle range of 45 degrees to 60 degrees with respect to the rotation direction of the winding drum 3, By forming the cuts 8 in this manner, the problem of the falling of the rising portion 6 can be more reliably prevented, and the occurrence of the collapse of the winding can be avoided.

It should be noted that the present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in the above embodiment, the wide interlayer film layer is formed by winding the wide interlayer film 4a. However, for example, as shown in FIG. A plurality of interlayer films 4c may be wound so as to partially overlap each other to form a wide interlayer film layer, or an interlayer film having a width smaller than the width of the winding drum 3 may be spirally wound. A wide interlayer film layer may be formed. In these cases, of course, the collars 5 on both sides of the winding drum 3 are also provided.
A cut 8 is formed in the rising portion 6 that rises along the direction of the arrow. The cut 8 is formed at an acute angle with respect to the rotation direction of the winding drum 3 when the cable 2 is wound around the winding drum 3.

In the above embodiment, a wide interlayer film layer and an interlayer film layer having a width substantially equal to the width of the winding drum 3 are alternately interposed between the layers of the cable 2. A wide interlayer film layer may be interposed between all the layers, or only in a predetermined portion,
A wide interlayer film layer may be provided. Also in these cases, the rising portion 6 of the interlayer film wound around the wide interlayer film layer and rising along the flange 5.
Is formed with a notch 8 whose cutting direction forms an acute angle with respect to the rotation direction of the winding drum 3.

[0021]

According to the present invention, a cut is formed at the rising portion of the interlayer film which is wound around the wide interlayer film layer and rises along the flange of the winding drum, and the cut direction is such that the cable is wound. Since the cable is formed at an acute angle with respect to the direction of rotation of the winding drum when turning, when the cable is wound around the winding drum, the cable points to the notch forming part in order from the deep part of the cut to the edge. Will come into contact,
Since the impact of this point contact is very small, it is possible to prevent the rising portion from falling down and being covered by the cable due to this point contact, and the collapse of the rising portion caused by the falling of the rising portion when winding the cable is prevented. Problems can be avoided.

Further, as described above, by making the angle between the cutting direction of the cut and the rotation direction of the winding drum when winding the cable an acute angle, when a wide interlayer film layer is formed, a rising portion is formed. Since falling can be prevented, falling of the rising portion at the time of forming a wide interlayer film layer can be avoided.

As described above, it is possible to prevent both rising of the rising portion during winding of the cable and formation of the wide interlayer film layer, so that the problem of falling of the rising portion is almost certainly avoided. Thus, it is possible to prevent the occurrence of a problem of winding collapse caused by the falling of the rising portion.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cut portion characteristic of the present embodiment.

FIG. 2 is a model diagram showing a wide interlayer film in the embodiment.

FIG. 3 is an explanatory diagram showing another embodiment.

FIG. 4 is an explanatory view showing a contact state between a cable and a cut forming portion when the cut direction is perpendicular to the rotation direction of the winding drum.

FIG. 5 is an explanatory diagram showing an example of a rising portion when a cutting direction is obtuse with respect to a rotation direction of a winding drum.

FIG. 6 is an explanatory diagram showing a problem that occurs when the rising portion has the form shown in FIG. 5;

FIG. 7 is an explanatory view showing an example of a laminated cable winding structure.

FIG. 8 is an explanatory view showing a conventional example of a wide interlayer film.

FIG. 9 is an explanatory diagram showing a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable lamination winding structure 2 Cable 3 Winding drum 4 Interlayer film 5 Flange 6 Rising part 8 Notch

Claims (1)

[Claims] At least one layer of a cable is wound around a cable winding bobbin provided with flanges at both ends, and at least one layer of the cable has a width smaller than the width of the bobbin. In the cable lamination winding structure in which a wide interlayer film layer is interposed, the rising portion of the interlayer film wound around the wide interlayer film layer and rising along the collar of the winding drum has an edge of the rising portion. The cable lamination winding structure, characterized in that at least one notch is provided at a position, and a cutting direction of the notch forms an acute angle with a rotation direction of the winding drum when the cable is wound around the winding drum. .