The present disclosure relates to a winding device and a winding method.
This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2019-004634, filed on Jan. 15, 2019, the entire contents of which are incorporated herein by reference.
Patent Literature 1 disclosures an optical fiber winding device in which a cover is attached to an outer circumference of a bobbin so that a free-state cleaved terminal wire does not bounce back to a wound-up winding body.
Patent Literature 1: JP-A-2005-200114
A winding device according to one aspect of the present disclosure includes:
a bobbin that winds up a striatum;
a cover that covers the bobbin and includes a slit parallel to an axial direction of the bobbin such that the striatum is inserted and;
a roller that guides the striatum directly to the bobbin; and
a mechanism for moving the roller relative to the bobbin or moving a location of the slit of the cover in a circumferential direction, depending on a bobbin winding body diameter of the striatum of the bobbin.
A winding method according to one aspect of the present disclosure is a winding method for a winding device including a bobbin that winds up a striatum, a cover that covers the bobbin and includes a slit parallel to an axial direction of the bobbin such that the striatum is inserted, and a roller that guides the striatum directly to the bobbin, in which the roller is moved relative to the bobbin or a location of the slit of the cover is moved in a circumferential direction, depending on a bobbin winding body diameter of the striatum of the bobbin.
In a winding device, when winding up a striatum such as an electric wire, an optical fiber, or the like that are continuously fed around a bobbin at a high speed, the winding device cannot immediately stop when the striatum is broken in the middle, such that a cleaved terminal wire becomes a free state and swings around the bobbin with rotation of the bobbin. Therefore, the cleaved terminal wire hits surrounding obstacles and protrusions and bounces back to a wound-up winding body, thereby causing a state called wire hitting that hits a surface of the winding body. This wire hitting has a significant effect on high-speed winding-up and damages the striatum wound up around the bobbin. Particularly, when the striatum is the optical fiber, the optical fiber wound up around the bobbin has low intensity or is broken. When such wire hitting occurs, the optical fiber wound up therearound is required to be discarded, which causes a decrease in yield.
An optical fiber winding device disclosed in Patent Literature 1 can reduce an influence caused by the wire hitting by using a cover provided on an outer circumference of the bobbin. However, as an amount of the optical fiber wound around the bobbin increases, a bobbin winding body diameter becomes large, such that the optical fiber introduced from a roller to the bobbin and the cover provided on the outer circumference of the bobbin may hit each other. In order to prevent this problem, an opening of the cover is required to become large, but when the opening thereof becomes large, the optical fiber bent at the time of being broken easily damages the optical fiber on a bobbin surface. Therefore, it is desirable that a size of the opening thereof is made as small as possible.
The present disclosure has been made in consideration of the above-described circumstances, and an object thereof is to provide a winding device and a winding method in which a cover covering a bobbin can be prevented from contacting a striatum wound up around the bobbin and smooth winding-up of the striatum can be performed.
According to the present disclosure, it is possible to obtain a winding device and a winding method in which a cover covering a bobbin can be prevented from contacting a striatum wound up around the bobbin and smooth winding-up of the striatum can be performed.
First, embodiments of the present disclosure will be listed and described.
(1) A winding device according to one aspect of the present disclosure includes:
a bobbin that winds up a striatum;
a cover that covers the bobbin and includes a slit parallel to an axial direction of the bobbin such that the striatum is inserted;
a roller that guides the striatum directly to the bobbin; and
a mechanism for moving the roller relative to the bobbin or moving a location of the slit of the cover in a circumferential direction, depending on a bobbin winding body diameter of the striatum of the bobbin.
Accordingly, it is possible to prevent the cover covering an outer circumference of the bobbin from contacting the striatum wound up around the bobbin, such that smooth winding-up of the striatum can be performed.
(2) A direction of relative movement between the bobbin and the roller may be a direction including a component orthogonal to a direction of the striatum at the start of winding and an axial direction of the roller.
Accordingly, it is possible to simply calculate a required movement distance of the bobbin or the roller.
(3) The bobbin winding body diameter may be calculated from a winding-up length of the striatum, or (4) may be calculated from a weight of the striatum wound around the bobbin.
Accordingly, it is possible to calculate the bobbin winding body diameter of the striatum wound around the bobbin with various methods.
(5) A winding method according to one aspect of the present disclosure is a winding method of a winding device including a bobbin that winds up a striatum, a cover that covers the bobbin and includes a slit parallel to an axial direction of the bobbin such that the striatum is inserted, and a roller that guides the striatum directly to the bobbin, in which the roller is moved relative to the bobbin or a location of the slit of the cover is moved in a circumferential direction, depending on a bobbin winding body diameter of the striatum of the bobbin.
Accordingly, it is possible to prevent the cover covering an outer circumference of the bobbin from contacting the striatum wound up around the bobbin, such that smooth winding-up of the striatum can be performed.
Hereinafter, desirable embodiments according to a winding device and a winding method of the present disclosure will be described with reference to the drawings. An optical fiber is described as an example of a striatum, and in the case of the striatum, the striatum may be not limited to the optical fiber but may be another striatum such as an electric wire or the like. In the following description, a configuration denoted by the same reference sign in different drawings will be regarded as the same configuration, and description thereof may be omitted. As long as a combination of a plurality of embodiments can be performed, the present disclosure includes a combination of any of the embodiments.
The scope of the present invention is not limited to the example of the present disclosure but is indicated by the scope of the claims, and is intended to include all the modifications within the meaning equivalent to the scope of the claims and within the scope thereof.
A winding device 1 includes a bobbin 10, a cover 13 for preventing wire hitting, and a roller 20.
The bobbin 10 includes a body portion 11 and flange portions 12 provided at opposite ends of the body portion 11. The roller 20 is disposed immediately before an upstream side of the bobbin 10. The cover 13 covers an outer circumference of the bobbin 10 that corresponds to an outer side in a radial direction of the bobbin 10. The cover 13 has an approximately cylindrical shape, and includes a slit 14 through which an optical fiber 30 is inserted and parallel to an axial direction of the bobbin 10. The bobbin 10 is rotated counterclockwise in
The above-described “immediately before the upstream side” does not indicate that locations of the roller 20 and the bobbin 10 are close to each other, but indicates that, as illustrated in
Next, a location relationship between the bobbin and the roller in the embodiment will be described.
As illustrated in
In the embodiment, the location of the roller 20 is caused to move in a Y-axis direction as the bobbin winding body diameter Dn becomes large. As a result, the optical fiber 30 passes through the center location of the slit 14 of the cover 13 even though the winding-up amount thereof increases, and the optical fiber 30 does not contact the cover.
In the embodiment, a movement amount a of the roller 20 is controlled depending on the bobbin winding body diameter Dn of the optical fiber 30. In order to perform this control, it is required to investigate a relationship between a winding-up length (a drawing length) of the optical fiber 30 drawn in advance and the bobbin winding body diameter Dn of the bobbin 10. Next, based upon the relationship therebetween, feedforward control may be performed by determining to what extent a relative location of the roller 20 should be moved with respect to the winding-up length of the optical fiber 30. An actual movement direction of the roller 20 is not required to coincide with the Y-axis direction. In this case, the movement direction of the roller 20 may be any direction including a Y-axis component. A movement amount of the Y-axis direction component at that time may be the movement amount a.
The relationship between the bobbin winding body diameter Dn of the bobbin 10 and the winding-up length (the drawing length) of the optical fiber 30 may be obtained by experiment, or may be obtained by numerical calculation. In the embodiment, the bobbin winding body diameter Dn of the bobbin 10 is obtained from the length of the optical fiber 30 by the numerical calculation, and the movement amount of the roller 20 is determined from the bobbin winding body diameter Dn as follows. The winding-up length of the optical fiber 30 may be measured separately.
A diameter of the body portion 11 of the bobbin 10 is defined as R, an axial length is defined as L, a diameter of the optical fiber 30 is defined as r, and a bobbin winding body diameter of an n-th layer is defined as Dn (n is an integer). It is assumed that the optical fibers 30 are tightly wound around the body portion 11 of the bobbin 10 without any gaps therebetween. Next, a bobbin winding body diameter D1 of a first layer, a bobbin winding body diameter D2 of a second layer, and the bobbin winding body diameter Dn of the n-th layer can be represented by the following Equation 1. The bobbin winding body diameter Dn corresponds to a distance between a center of the optical fiber 30 located on an outmost circumstance wound up around the bobbin 10 and a center of the optical fiber 30 located on an outmost circumstance on an opposite side of a center of the bobbin 10. An example of the optical fiber 30 includes the one formed in such a manner that a glass fiber having a diameter of 125 μm is coated with a primary coating layer and a secondary coating layer formed of an ultraviolet curable resin, respectively, and an outermost circumference of the glass fiber is further coated with a colored layer formed of ultraviolet curable ink to form the diameter r of 250 μm.
[Equation 1]
D1=R+r
D2=R+r+√{square root over (3)}r
Dn=R+r+(n−1)√{square root over (3)}r (Equation 1)
The number of turns of the optical fiber 30 per layer is defined as k. A winding-up length A1 of the optical fiber of the first layer, a winding-up length A2 of the optical fiber of the second layer, and a winding-up length An (n is an integer) of the optical fiber of the n-th layer can be represented by the following Equation 2.
From the winding-up length of the optical fiber 30, the number of layers (the n-th layer) of the bobbin 10 around which the optical fiber 30 is wound is calculated from Equation 2, and the number of layers n is applied to Equation 1, thereby making it possible to obtain the bobbin winding body diameter Dn.
Depending on a change in the bobbin winding body diameter Dn, the movement amount a for causing the roller 20 to move in the Y-axis direction is obtained so that the optical fiber 30 does not contact the cover 13. As illustrated in
Next, as illustrated in
When the distance in the X-axis direction between the center of the bobbin 10 and the center of the roller 20 is defined as Lx, the diameter Lb of the cover 13 and the diameter R of the bobbin are already known, such that the angle θ may be obtained in order to obtain the movement amount a from Equation 4.
Accordingly, an angle θ is obtained by the following Equation 6.
In Equation 6, since the diameter r of the optical fiber 30, the diameter R of the body portion 11 of the bobbin 10, and the diameter Lb of the cover 13 are already known, the angle θ can be obtained from the bobbin winding body diameter Dn obtained from Equation 1. The movement amount a of the roller 20 can be obtained by substituting the angle θ obtained in Equation 6 into Equation 4.
The first embodiment describes the method of calculating the bobbin winding body diameter Dn from the winding-up length of the optical fiber 30, and the bobbin winding body diameter Dn changes depending on a weight of the optical fiber 30 wound up around the bobbin 10. Therefore, instead of calculating the bobbin winding body diameter Dn from the winding-up length of the optical fiber 30, the bobbin winding body diameter Dn may be calculated from the weight of the optical fiber 30 wound around the bobbin 10. In order to obtain the weight of the optical fiber 30 wound around the bobbin 10, the weight of the bobbin 10 in a state where the optical fiber 30 is wound therearound may be measured, and the weight of the bobbin 10 itself measured in advance may be subtracted therefrom. The bobbin winding body diameter Dn may be calculated from the weight of the optical fiber 30 wound around the bobbin 10 obtained as described above.
In the first and second embodiments, the bobbin winding body diameter Dn is obtained from the winding-up length of the optical fiber 30 and the weight of the optical fiber 30 wound around the bobbin 10, and the bobbin winding body diameter Dn may be directly obtained. As a method of obtaining the bobbin winding body diameter Dn, for example, the bobbin winding body diameter Dn can be obtained through the slit 14 of the cover 13 by using an optical rangefinder.
In the first embodiment, as the bobbin winding body diameter Dn becomes large, the roller 20 is caused to move in the Y-axis direction, and instead of causing the roller 20 to move, the bobbin 10 and the cover 13 may be caused to move in the Y-axis direction. The roller 20 and both the bobbin 10 and the cover 13 may be caused to move. In this manner, the roller 20, the bobbin 10, and the cover 13 may be caused to move relatively.
Even though any one of methods described in the embodiments is used, the winding device 1 (1′) includes the following (a), (b), and (c) inside winding device 1 (1′) or as a separate apparatus.
(A) A memory for storing specifications of respective components such as, for example, the diameter r of the optical fiber 30, the diameter R of the body portion of the bobbin 10, the distance Lx in the X-axis direction between the center of the bobbin 10 and the center of the roller 20, the distance La from the contact point S of the bobbin 10 of the optical fiber 30 at the time of the start of winding to the middle point P of the slit 14 of the cover 13, the diameter Lb of the cover 13, or the like.
(B) A memory for storing a program for performing each calculation.
(C) A calculation apparatus for processing the winding-up length of the optical fiber 30 and the bobbin weight or a measurement signal from the optical rangefinder.
Number | Date | Country | Kind |
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2019-004634 | Jan 2019 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2020/001071 | 1/15/2020 | WO | 00 |