JP2019064761A - Bobbin - Google Patents

Abstract

To provide a bobbin that is capable of sustaining the bobbin strength without causing cracks or disconnection between a shell and a flange even if an excessive stress concentration due to a cable takes place between the shell and the flange during reeling off of a cable, of being formed by one metal mold, and is low in cost.SOLUTION: A bobbin 100 is a bobbin comprising a shell 110 over which a linear stock is wound, a pair of flanges 120, 120 integrally provided respectively at both ends of the shell 110. A parting plane F having a single prescribed angle greater than 0° with respect to a plane orthogonal to a rotation axis X of the bobbin 100 is formed extending between the pair of flanges 120, 120 in a manner splitting the bobbin 100 into identically shaped two parts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bobbin, and more particularly to a bobbin used to wind a linear body such as an optical fiber cable.

A linear body such as an optical fiber cable is usually wound around a bobbin called by the name of a reel, a drum, a spool, a winding frame or the like for storage, transportation and the like.
For example, since an optical fiber cable such as a drop cable is light, it can be carried and laid by hand, and weight reduction is also required in its packaging, in which case the bobbin is formed of expanded polystyrene (Patent Document 1) reference).
FIG. 9 is a cross-sectional view showing an example of a conventional bobbin. The bobbin 700 of FIG. 9 includes a cylindrical body 710 around which a linear body is wound, and a pair of ridges 720 and 730 located at both ends of the body 710.
In winding the linear body around the bobbin 700, the rotary shaft is passed through an axial hole (not shown) of the bobbin 700, the bobbin 700 is rotated with respect to the rotation axis X, and the linear body is Align and wrap while continuously guiding around 710.

  The bobbin 700 is assembled by joining together a body 710 and one barb 720 integrally molded and a barb 730 only.

Japanese Utility Model Publication No. 62-77178

  However, such a conventional bobbin 700 has two molds, ie, a mold for integrally forming the body 710 and the one collar 720 and a mold for molding only the other collar 730. It will not be possible to reduce the mold manufacturing cost and the mold maintenance cost.

And, a divided surface is formed between the body 710 and the weir 730 of the bobbin 700 obtained by such two molds.
For this reason, in order to maintain the joint strength of this parting plane, it is necessary to create a complex joint structure between the body 710 and the weir 730. In addition, if an excessive stress concentration by the cable occurs during the extension of the cable in this divided surface, a crack or division may occur in this divided surface, which may cause problems in the extension of the cable.

  The present invention has been made in view of the above-described circumstances, and even if excessive stress concentration is caused by the cable between the trunk and the heel during the extension of the cable, a crack or division occurs between the trunk and the heel. It is an object of the present invention to provide a low cost bobbin which can maintain the strength of the bobbin without causing the problem and can be molded with one mold.

  A bobbin according to an aspect of the present invention is a bobbin including a body around which a linear body is wound, and a pair of hooks integrally provided at both ends of the body, and dividing the bobbin into two in the same shape A surface is formed extending between the pair of wedges.

  According to the above, even if excessive stress concentration by the cable occurs between the trunk and the heel during cable extension, the strength of the bobbin is maintained without cracking or separation between the trunk and the heel, It is possible to provide a low cost bobbin which can be molded with one mold.

It is a perspective view for demonstrating the bobbin by Example 1 of this invention. FIG. 2 is a cross-sectional view as viewed from reference numeral 2A-2A shown in FIG. It is an exploded view of the bobbin shown in FIG. It is an exploded view of the bobbin by Example 2 of this invention. It is an exploded view of the bobbin by Example 3 of this invention. It is a perspective view for demonstrating the bobbin by Example 4 of this invention. FIG. 7 is a cross-sectional view as viewed from reference numerals 7A-7A shown in FIG. 6; It is an exploded view of the bobbin by Example 5 of this invention. It is sectional drawing for demonstrating the conventional bobbin.

Description of the embodiment of the present invention
First, the contents of the embodiment of the present invention will be listed and described.
The bobbin according to one aspect of the present invention is a bobbin including: (1) a body on which a linear body is wound; and a pair of hooks integrally provided on both ends of the body, which are orthogonal to the rotation axis of the bobbin A dividing surface having a single predetermined angle larger than 0 ° with respect to the surface is formed to extend between the pair of ribs so as to divide the bobbin into the same shape.

Therefore, the bobbin has a halved structure with the divided surface which is divided into two into the same shape as the reference surface. As a result, the entire bobbin can be manufactured with a single mold for forming half of the entire bobbin, mass production of the bobbin becomes easy, and cost reduction of the manufacturing can be achieved.
Moreover, the division | segmentation surface which exists in the direction different from the extending | stretching direction of the said linear body exists by the division | segmentation surface which divides the said bobbin in 2 by extending | stretching between the pair of ridges, and being formed. As a result, even if excessive stress concentration is caused by the cable between the trunk and the heel during cable extension, the strength of the bobbin can be extended for a long time without cracking or separation between the trunk and the heel. Can be held.
Further, since the area of the divided surface can be made larger than that of forming the divided surface in parallel to the plane orthogonal to the rotation axis, the bonding strength can be increased.

(2) In the above-described bobbin, the dividing surface is formed along a plane passing through the rotation axis of the bobbin.
As a result, the dividing surface for dividing the bobbin into the same shape is formed in the direction orthogonal to the extending direction of the linear body, so that the extending position of the linear body is any position along the rotational axis of the bobbin Even if it is, it can avoid that the stress by the cable under delivery to the said dividing surface is concentrated.
Further, the mold design of the bobbin is most simplified, and furthermore, in the assembly process of the bobbin, it is only necessary to mutually combine the half structure toward the rotational axis of the bobbin, so that the assembly operation can be simplified. .

(3) In the above-described bobbin, the dividing surface is formed along a plane inclined with respect to the rotation axis of the bobbin from one of the pair of weirs toward the other.
As a result, divided surfaces for dividing the bobbin into two in the same shape are formed in a direction different from the extending direction of the linear body, so that the extended position of the linear body is at any position along the rotational axis of the body. Even if there is, the divided surface can be made less susceptible to the stress concentration due to the cable being fed.
Further, the mold design of the bobbin is simplified, and furthermore, in the bobbin assembly process, it is only necessary to mutually combine the half structure from the direction of the axis of rotation of the bobbin and the coaxial direction, and the assembly operation can be simplified. .

(4) In the above-mentioned bobbin, the division surface is provided with an engagement portion which causes the division surfaces to be engaged with each other in a concavo-convex manner.
This not only makes it possible to greatly increase the mutual bonding strength, but also makes it possible to reliably assemble the bobbin by eliminating the bonding deviation of the divided surfaces at the time of assembly of the bobbin.

(5) In the above-described bobbin, the body and the pair of weirs are formed of expanded polystyrene.
Thereby, the weight of the bobbin can be reduced.

(6) In the above-described bobbin, the body is formed as a hollow body through which the rotation shaft is inserted.
Thereby, it is possible to reduce the weight of the bobbin and to suppress the application of a large pull-back force to the linear body when the linear body wound around the body is unwound from the bobbin. In addition, the total weight of the bobbin including the linear body can be suppressed.

Details of the Embodiment of the Present Invention
Hereinafter, a preferred embodiment of a bobbin according to the present invention will be described with reference to the drawings.
The present invention is not limited to these exemplifications, but is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.
Moreover, in the following description, the structure which attached | subjected the same code | symbol also in different drawings may abbreviate | omit the description as it is the same thing.

Example 1
FIG. 1 is a perspective view for explaining a bobbin according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view seen from reference numeral 2A-2A shown in FIG. 1, and FIG. 3 is shown in FIG. It is an exploded view of a bobbin.

As shown in FIG. 1, the bobbin 100 is formed of expanded polystyrene foam which can be reduced in weight, and a body 110 around which a linear body (not shown) such as an optical fiber is wound. A pair of wedges 120, 120 respectively disposed on the top. Also, the shapes of these weirs 120, 120 are identical.
The body 110 and the pair of collars 120, 120 are formed in a cylindrical shape as a hollow body provided with an axial hole through which a rotary shaft (not shown) is inserted.

  Therefore, when winding the linear body around the bobbin 100, the rotary shaft (not shown) of the bobbin 100 is supplied from another device while rotating the bobbin 100 around the rotation axis X of the bobbin 100 through the rotation axis (not shown). A linear body is guided while traversing along the rotational axis X of the bobbin 100, and is sequentially aligned and wound around the body 110.

Further, since the body 110 is formed as a hollow body as shown in FIGS. 1 and 2, weight reduction of the bobbin 100 can be achieved, and a linear body (not shown) wound around the body 110 is removed from the bobbin 100. At the time of drawing out, the application of a large pullback force to the linear body is suppressed.
In addition, the total weight of the bobbin 100 including the linear body is suppressed.

Furthermore, in the bobbin 100, a dividing surface F having a single predetermined angle larger than 0 ° with respect to a plane orthogonal to the rotation axis X of the bobbin 100 has the same shape as the body 110 and the pair of wedges 120 and 120. The division plane F is formed to extend between the pair of wedges 120 so as to be divided into two, so that the division plane F is in a direction different from the extension direction of the linear body, that is, in the case of the first embodiment. And in the direction perpendicular to the direction of extension of the linear body.
Therefore, the bobbin 100 according to the first embodiment of the present invention has a half structure using the dividing surface F as the reference surface that divides the body 110 and the pair of collars 120 and 120 into the same shape along the plane passing through the rotation axis X It becomes.
That is, the body 110 and the pair of ridges 120 and 120 have a semicircular shape in which the cross-sectional shape of the doughnut-like shape is divided into two.

As a result, as shown in FIG. 3, the mold design of the bobbin 100 is simplified to the most die-cutable form, and can be manufactured with a single mold that molds half of the entire bobbin 100.
In addition, the bobbin 100 is fixed to each other with an adhesive or the like at the dividing surface F by the divided surface F and the pair of wedges 120 and 120 which are divided into two along the plane passing through the rotation axis X of the bobbin 100. As a result, the assembly process of the bobbin 100 is simplified, mass production of the bobbin 100 is facilitated, and the manufacturing cost can be reduced.

  Further, in the first embodiment of the present invention, a dividing surface F for dividing the body 110 and the pair of ridges 120, 120 into two into the same shape is formed extending between the pair of ridges 120, 120, and a linear body Exist in a direction different from the extension direction of the wire, that is, in a direction perpendicular to the extension direction of the linear body.

For this reason, it is possible to avoid concentration of stress due to the cable being fed out to the dividing surface F regardless of the position where the linear body is fed out along the rotational axis X of the body 110.
Therefore, even if an excessive stress concentration is caused by the cable between the body 110 and the weir 120 during the extension of the cable, the strength of the bobbin 100 can be extended for a long time without causing any cracks or divisions between the body 110 and the weir 120. It can be held over.

(Example 2)
Next, FIG. 4 shows a bobbin 200 according to a second embodiment of the present invention, and FIG. 5 shows a bobbin 300 according to a third embodiment of the present invention.
Here, the bobbin 200 of the second embodiment and the bobbin 300 of the third embodiment are different from the bobbin 100 of the first embodiment described above only in the specific form of the dividing surface F, and the other forms are basically the same. There is no change in any way.
Therefore, the same members as those of the bobbin 100 of the first embodiment described above are denoted by reference numerals in the 200s or 300s, respectively, so that the redundant description thereof is omitted, and it differs from the bobbin 100 of the first embodiment described above. The specific form of the division plane F will be described below.

First, in a bobbin 200 according to a second embodiment of the present invention shown in FIG. 4, engagement is performed such that divided surfaces F dividing a pair of ridges 220 and 220 into two into the same shape cause the divided surfaces F to engage with each other in an uneven manner. The unit 230 is provided.
That is, the engaging portion 230 is composed of a protrusion 231 and a groove 232 fitted to the protrusion 231, and is engaged with each other and positioned when assembling the bobbin 200.

Thus, the bobbin 200 according to the second embodiment of the present invention achieves the same effect as the bobbin 100 according to the first embodiment of the present invention, and engages with the projection 231 and the projection 231 when assembling the bobbin 200. Only by uniting the half structure mutually from the radial direction toward the rotational axis X of the bobbin 200 while positioning by the engaging portion 230 configured by the groove 232, the bonding deviation of the divided surface F does not occur, and the bobbin 200 can be assembled reliably.
In addition, the joint strength between the divided surfaces F can be greatly increased by the engaging portion 230.

(Example 3)
Further, in the bobbin 300 according to the third embodiment of the present invention shown in FIG. 5, the division surfaces F dividing the pair of ridges 320 into two pieces having the same shape engage with each other as the division surfaces F engage with each other. The joint unit 330 is provided.
That is, the engaging portion 330 is composed of a dowel-like protrusion 331 and a dowel-like hole 332 which is fitted with the protrusion 331, and is positioned by being engaged with each other in a concavo-convex manner when the bobbin 300 is assembled.

As a result, the bobbin 300 according to the third embodiment of the present invention exhibits the same effect as the bobbin 100 according to the first embodiment of the present invention, and the division surface F similarly to the bobbin 200 according to the second embodiment of the present invention. The joint strength between the two is greatly increased by the engaging portion 330.
In addition, due to the engaging portion 330 configured by the dowel-like protrusion 331 and the dowel-like hole 332 that engages with the protrusion 331, the joint deviation of the division plane F does not only in the joining direction but The bobbin 300 can be more reliably assembled without being generated in the axial direction of the rotational axis X of 300.

(Example 4)
FIG. 6 shows a bobbin 400 according to a fourth embodiment of the present invention.
Here, the bobbin 400 of the fourth embodiment is different from the bobbin 100 of the first embodiment described above only in the specific form of the dividing surface F, and the other forms are basically the same. .
Therefore, the same members as those of the bobbin 100 of the first embodiment described above are denoted by reference numerals in the 400s, so that the overlapping description is omitted, and the division plane F different from the bobbin 100 of the first embodiment described above The specific form of is described below.

  In a bobbin 400 according to a fourth embodiment of the present invention, a split surface F that splits the bobbin 400 into the same shape has a direction different from the feeding direction of a linear body (not shown) such as an optical fiber, that is, a pair of ridges It is formed along a plane inclined with respect to the rotation axis X of the bobbin 400 from one of 420 and 420 toward the other.

  Therefore, the bobbin 400 according to the fourth embodiment of the present invention has a half-split structure with the dividing surface F, which is equally divided into two in the same shape obliquely to the rotation axis X of the bobbin 400, as a reference surface. That is, the pair of weirs 420, 420 has a shape integrated with each of the diagonally divided body 410.

  As a result, as shown in FIG. 6, the mold design of the bobbin 400 can be manufactured with a single mold that molds half of the entire bobbin 400, and divided into two equally in the same shape obliquely to the rotation axis X Since the bobbin 400 is completed by fixing the body 410 of the divided half structure to each other with the dividing surface F with an adhesive or the like, the assembly process of the bobbin 400 is simplified and mass production of the bobbin 400 is facilitated. The manufacturing cost can be reduced.

Further, the division surface F for dividing the bobbin 400 into two into the same shape is formed in a direction having a predetermined angle larger than 0 ° with the extension direction of the linear body, whereby the extension position of the linear body is obtained. Is at any position along the rotational axis X of the body 410, it is possible to avoid concentration of stress due to the cable being fed to the dividing surface F.
In addition, even if stress concentration occurs by the cable between the body 410 and the weir 420 during the extension of the cable, the strength of the bobbin 400 is maintained for a long time without being divided between the body 410 and the weir 420. be able to.

(Example 5)
The bobbin 500 which is Example 5 of the present invention shown in FIG. 8 is provided with an engaging portion 530 which causes the divided surfaces F to be unevenly engaged with each other. .
That is, the engaging portion 530 is configured by the dowel-shaped protrusion 531 and the dowel-shaped hole 532 fitted with the protrusion 531, and is positioned by being engaged with each other in concavo-convex engagement when the bobbin 500 is assembled.

Thus, the bobbin 500 according to the fifth embodiment of the present invention exhibits the same effect as the bobbin 400 according to the fourth embodiment of the present invention, and the joint portions 530 significantly increase the mutual joint strength in the division plane F. To increase.
In addition, due to the engaging portion 530 constituted by the dowel-shaped protrusion 531 and the dowel-shaped hole 532 fitted with the protrusion 531, the joint deviation of the divided surface F at the time of assembling the bobbin 500 is not only the joint direction but The bobbin 500 can be more reliably assembled without being generated in the axial direction of the rotational axis X of 500.

100, 200, 300, 400, 500, 700 ... bobbin, 110, 210, 310, 410, 510, 710 ... body, 120, 220, 320, 420, 520, 720, 730 ... collar, 230, 330, 530 ... Engaging portion, 231: projection, 232: groove, 331, 531: dowel-like protrusion, 332, 532: dowel-like hole, F: dividing surface, X: rotation axis.

Claims (6)

A bobbin comprising: a body on which a linear body is wound; and a pair of weirs integrally provided on both ends of the body,
A dividing surface having a single predetermined angle larger than 0 ° with respect to a plane orthogonal to the rotational axis of the bobbin is formed to extend between the pair of ribs so as to divide the bobbin into the same shape. Being a bobbin.   The bobbin according to claim 1, wherein the dividing surface is formed along a plane passing through an axis of rotation of the bobbin.   The bobbin according to claim 1, wherein the dividing surface is formed along a plane inclined with respect to the rotation axis of the bobbin from one of the pair of weirs to the other.   The bobbin according to any one of claims 1 to 3, wherein the division surface includes an engagement portion that causes the division surfaces to be engaged with each other in an uneven manner.   The bobbin according to any one of claims 1 to 4, wherein the body and the pair of hooks are formed of expanded polystyrene.   The bobbin according to any one of claims 1 to 5, wherein the body is formed as a hollow body through which the rotation shaft is inserted.

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