JP2004012540A - Crosshead and method for passing wire into crosshead - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crosshead and a method for passing wires into the crosshead for obtaining high workability and accurately passing wires into the crosshead when passing a plurality of linear bodies into the crosshead. <P>SOLUTION: The crosshead 1 is provided with a crosshead body 2 which is cylindrically constituted, a die 3 attached to the front end (one end) of the crosshead body 2 and a nipple 6 arranged with a prescribed interval from the die 3 in the crosshead body 2 and is constituted so as to coat, with resin 103 in a lump, the peripheries of a coated optical fiber 101 and a steel wire 102 passing through respectively a fiber inserting hole 7 and a steel wire inserting hole 7a formed in the nipple 6 . The nipple 6 is constituted so as to be inserted from the rear end (other end) side of the crosshead body 2 into the inside of the crosshead body 2 and positioned so as to maintain the prescribed interval from the die 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crosshead constituting a part of an extruder and a method of passing the crosshead, and more particularly, to a crosshead and a crosshead for extruding and coating a resin on a plurality of linear bodies. It relates to the method of threading.
[0002]
[Prior art]
As a cable formed by collectively covering a plurality of linear bodies with resin, for example, an optical fiber cable for premises wiring can be cited. An example of the optical fiber cable for the local wiring is shown in FIG. In this optical fiber cable 100, for example, an optical fiber core wire 101 having a diameter of 0.25 mm is arranged at the center, and steel wires 102 having a diameter of 0.4 mm, which are tension members, are arranged in parallel on both sides thereof. As the tension member, fiber reinforced plastic (FRP) may be used instead of the steel wire 102.
The optical fiber core wire 101 and the two steel wires 102 are integrally formed by being collectively covered with a plastic resin 103.
[0003]
When the plastic resin 103 is coated, extrusion molding is performed using a crosshead 110 as shown in FIG. The crosshead 110 is a device that constitutes a part of the extruder, and is connected to a cylinder 120 for supplying the plastic resin 103 that has been heated to become a fluid. A die 112 is attached to the front end (one end) of the cross-head body 111 configured in a cylindrical shape, and a nipple 113 is positioned inside the die 112 with a predetermined interval. A gap between the die 112 and the nipple 113 is a flow path 116 for extruding the plastic resin 103. The die 112 is formed with an extrusion hole 112a having a cross section substantially the same as the outer shape of the optical fiber cable 100 (see FIG. 8).
[0004]
A cylindrical nipple holder 114 is mounted on the inner side of the crosshead main body 111 behind the nipple 113. The nipple holder 114 is fixed by screwing from behind with a suction holder 115. Further, the nipple holder 114 has a thread 114a formed on the inner peripheral surface near the front end. A thread ridge 113a formed on the outer periphery near the rear end of the nipple 113 is screwed into the thread ridge 114a from the front, and the nipple 113 is fixed at a predetermined position.
[0005]
A front view of the nipple 113 is shown in FIG.
The nipple 113 has a fiber insertion hole 117 through which the optical fiber core wire 101 is inserted. The diameter of the fiber insertion hole 117 is set to 0.4 mm, which is slightly larger than the diameter of the optical fiber core wire 101.
Further, in the vicinity of the fiber insertion hole 117, two steel wire insertion holes 117a are formed so as to face each other with the fiber insertion hole 117 as a center. The diameters of the two steel wire insertion holes 117 a are set to 0.6 mm, which is slightly larger than the diameter of the steel wire 102.
By setting the diameters of the fiber insertion hole 117 and the steel wire insertion hole 117a to be slightly larger than the linear body to be inserted, the gap when the linear body is inserted is made as narrow as possible. This is to prevent the resin from leaking out from the flow path 116 through the insertion holes 117 and 117a.
[0006]
As shown in FIG. 9, the optical fiber core wire 101 and the two steel wires 102 are inserted through the nipple 113 and the die 112, and from the rear end (other end) side to the front end (one end) side of the crosshead 110. Traveling toward (in the direction of arrow A in the figure). In addition, the resin 103 supplied from the cylinder 120 is extruded toward the extrusion hole 112a in the flow path 116, and is collectively covered around the optical fiber core wire 101 and the two steel wires 102. Thereby, the optical fiber cable 100 (refer FIG. 8) is produced.
[0007]
[Problems to be solved by the invention]
By the way, when inserting the optical fiber core wire 101 and the two steel wires 102 which are linear bodies into the insertion holes 117 and 117a of the nipple 113, the nipple 113 is first attached to the nipple holder 114. Must have been. This is because, when a plurality of linear bodies are passed through the nipple 113 before the nipple 113 is mounted, the nipple 113 must be rotated when the nipple 113 is screwed to the nipple holder 114 thereafter.
Further, as described above, the fiber insertion hole 117 and the steel wire insertion hole 117a of the nipple 113 are slightly larger in diameter than the linear body to be inserted. Furthermore, the length L from the rear end to the front end of the crosshead 110 is generally about 20 to 30 cm.
[0008]
Therefore, it is difficult to pass through the insertion holes 117 and 117a of the nipple 113 attached to the front end of the cross head 110 from the rear end side of the cross head 110. Also, the linear body may be mistakenly inserted into the wrong insertion hole, and the optical fiber core wire 101 and the steel wire 102 may cross or get entangled in the crosshead 110. was there. In that case, it was not possible to perform the covering operation by running the linear body.
[0009]
An object of the present invention is to provide a crosshead and a crosshead threading method capable of obtaining good workability and accurately threading when a plurality of linear bodies are threaded through the crosshead. is there.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a crosshead according to the present invention includes a crosshead main body configured in a cylindrical shape through which a plurality of linear bodies can be inserted, a die attached to one end of the crosshead main body, and a crosshead The inside of the main body has a die and a nipple provided at a predetermined interval, the resin is extruded from between the die and the nipple, and the periphery of the linear body that passes through each of the plurality of insertion holes provided in the nipple In the cross head configured to cover the resin all together, the nipple is configured to be inserted into the cross head main body from the other end side of the cross head main body and to maintain a predetermined distance from the die. It is positioned.
[0011]
According to the crosshead having such a configuration, before inserting the nipple into the crosshead main body, the plurality of linear bodies are inserted through the insertion holes of the nipple, and then the nipple is inserted from the other end side of the crosshead main body. It can be inserted and positioned on one end side. Therefore, it is easy to accurately pass a plurality of linear bodies through the insertion holes of the nipple. Therefore, the workability of passing through the crosshead is good.
[0012]
In the crosshead according to the present invention, the first guide portion is provided on the outer surface of the nipple, and the inner side of the crosshead body is engaged with the first guide portion so that the nipple extends along the traveling direction of the linear body. It is desirable to provide a second guide part for guiding.
[0013]
According to the crosshead having such a configuration, when the nipple is inserted inside the crosshead main body, the nipple can be inserted while being slid along the traveling direction of the linear body. Therefore, the plurality of linear bodies inserted through the nipple do not intersect in the cross head body.
[0014]
In the crosshead according to the present invention, it is desirable that the nipple is restricted from moving in the other end side direction of the crosshead body by a position restricting member that can be divided along the traveling direction of the linear body.
[0015]
According to the crosshead having such a configuration, after the nipple is inserted inside the crosshead main body, the divided position regulating members are mutually attached from the side of the linear body located on the other end side of the crosshead main body. The nipple can be positioned in an integrated manner. Therefore, it is not necessary to insert a linear body through the position restricting member in advance, and workability can be improved.
[0016]
In addition, the crosshead wire passing method according to the present invention for achieving the above object is provided separately from the crosshead main body inside the crosshead main body configured in a cylindrical shape through which a plurality of linear bodies can be inserted. When mounting the nipple configured in the above, the linear body is inserted into each of the plurality of insertion holes provided in the nipple, and the other end opposite to the one end side where the dice is mounted inside the crosshead body. After inserting from the side, the nipple is inserted from the other end side of the crosshead body toward the one end side.
[0017]
According to the method of passing the crosshead having such a configuration, the linear body is inserted into the insertion hole of the nipple before the nipple is inserted inside the crosshead body. Easy to pass accurately through the hole. Therefore, the workability of passing through the crosshead is good.
[0018]
In the crosshead threading method according to the present invention, when inserting the nipple inside the crosshead body, it is desirable to insert the nipple while sliding along the traveling direction of the linear body.
[0019]
According to the crossing method of the crosshead having such a configuration, a plurality of linear bodies inserted through the nipple do not intersect in the crosshead.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a crosshead and a crosshead threading method according to the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing an embodiment of the crosshead of the present invention, FIG. 2 is a front view showing a die in FIG. 1, FIG. 3 is a front view showing a nipple in FIG. 1, and FIG. It is a perspective view which shows a member. 5 to 7 are cross-sectional views showing a process of passing through the cross head shown in FIG. 1, FIG. 5 shows a state in which a linear body is inserted through the nipple and the cross head body, and FIG. FIG. 7 shows a state where a die is mounted on the crosshead body, and FIG. 7 shows a state when the nipple is inserted into the nipple holder.
[0021]
The crosshead of this embodiment is a device that constitutes a part of an extruder for collectively covering a plurality of linear bodies with resin, and a die is mounted while the linear bodies are inserted through nipples. A nipple is attached to the inside of the crosshead body from the other end side opposite to the one end side of the crosshead body.
Further, the nipple is inserted by sliding movement while maintaining a constant posture without being rotated until it is inserted and positioned from the other end side to the one end side of the crosshead body.
Further, the position regulating member for positioning the nipple has a halved shape that can be divided along the traveling direction of the linear body, and is arranged around the linear body from the side of the linear body, Inserted inside the body.
[0022]
In addition, the crosshead of this embodiment shows the aspect for forming the optical fiber cable 100 (refer FIG. 8) mentioned above as an example.
[0023]
As shown in FIG. 1, in the crosshead 1 of the present embodiment, a die 3 is attached to the front end (one end) of the crosshead body 2, and a nipple 6 is fixed in the vicinity of the rear (right side in the drawing). The nipple 6 is positioned by a position restricting member 12 inside a nipple holder 9 that is inserted and fixed inside the crosshead main body 2.
The crosshead main body 2 is connected to a cylinder 120 that constitutes a part of the extruder. The cylinder 120 is a device that heats and melts the resin to supply the fluidized resin to the flow path 18 of the crosshead 1. The flow path 18 is a gap portion between the die 3 and the nipple 6, and the resin 103 that has passed through the flow path 18 is extruded forward from the extrusion hole 4 of the die 3. That is, the resin 103 is collectively coated around the optical fiber core wire 101 and the steel wire 102 that pass through the nipple 6. Thereby, the optical fiber cable 100 is produced.
[0024]
As shown in FIGS. 1 and 2, the die 3 is formed with an extrusion hole 4 for extruding a resin from the flow path 18 in the central portion of the front surface. The extrusion hole 4 has substantially the same shape as the cross-sectional outer shape of the optical fiber cable 100 (see FIG. 8).
In addition, fixing portions 5 are formed on both sides of the outer peripheral side surface of the die 3, and the fixing portions 5 are provided with fixing holes 5a for mounting on the crosshead body 2 by screwing.
[0025]
As shown in FIGS. 1 and 3, the nipple 6 has a substantially cylindrical shape, and a fiber insertion hole 7 and a steel wire insertion hole 7a are formed at the front end thereof. The fiber insertion hole 7 and the steel wire insertion hole 7a are provided in the same arrangement and shape as the fiber insertion hole 117 and the steel wire insertion hole 117a (see FIG. 10).
In addition, guide protrusions 8 are provided on the outer periphery of the rear end portion of the nipple 6 in the vertical direction. The guide protrusion 8 is a first guide portion that engages with a guide groove 10 that is a second guide portion described later.
The nipple 6 is inserted forward from the rear end (other end) side of the crosshead body 2 into the nipple holder 9 so as to maintain a predetermined distance from the die 3 at the front end position of the guide groove 10. It is positioned from behind by the position regulating member 12.
[0026]
As shown in FIG. 1, the nipple holder 9 has a substantially cylindrical shape, and is positioned along two traveling directions (in the direction of arrow A) of the optical fiber core wire 101 at two opposing locations (upper and lower in the figure) of the inner peripheral surface. A guide groove 10 which is a two guide portion is formed. The guide groove 10 engages with the guide protrusion 8 of the nipple 6 when the nipple 6 is inserted into the nipple holder 9 so that the nipple 6 slides along the traveling direction of the optical fiber core wire 101. It is for guiding. The front end position of the guide groove 10 is a position where the nipple 6 is positioned.
A thread 11 is formed on the inner peripheral surface of the nipple holder 9 in the vicinity of the rear end. A thread 15 of a suction holder 16 to be described later is screwed into the thread 11 to press the nipple holder 9 toward the outside (cross head main body 2 side). Due to this pressing force, a strong frictional resistance acts between the nipple holder 9 and the crosshead body 2, and the nipple holder 9 is fixed so as not to move backward.
[0027]
As shown in FIGS. 1 and 4, the position regulating member 12 includes a half-split position regulating cylinder 13 and a suction holder 14.
The position regulating cylinder 13 includes two half cylinders having a shape in which a cylinder formed so as to contact the inner periphery of the nipple holder 9 is divided into two along the longitudinal direction (the traveling direction of the optical fiber core wire 101). 13a. The position regulating cylinder 13 is inserted into the nipple holder 9 in a state where it abuts against the rear end of the nipple 6.
[0028]
The suction holder 14 is composed of two halved holders 14 a in which the cylinder is divided into two, like the position regulating cylinder 13. At the rear end of each half holder 14a, a restricting portion 16 having an outer diameter enlarged so as to contact the rear end of the crosshead body 2 is provided. Further, a screw thread 15 is formed on the outer periphery of the vicinity of the front end of each half holder 14a. The thread 15 is screwed into the thread 11 of the nipple holder 9 until the restricting portion 16 contacts the rear end of the crosshead body 2.
As a result, the front end of the suction holder 14 comes into contact with the rear end of the position regulating cylinder 13 and the position regulating cylinder 13 is pressed forward. The position regulating cylinder 13 presses the nipple 6 from the rear to the front (leftward in the figure), and the nipple 6 is positioned at the front end of the guide groove 10.
[0029]
Next, a method for passing the cross head through which the plurality of linear bodies are inserted through the cross head 1 described above will be described.
First, as shown in FIG. 5, a nipple 6 is prepared behind the crosshead body 2 in a state where the nipple holder 9 is inserted into the crosshead body 2. Then, the optical fiber core wire 101 and the steel wire 102 are inserted from the rear side of the nipple 6 toward the front side through the fiber insertion hole 7 and the steel wire insertion hole 7a of the nipple 6, respectively. Since this operation is performed outside the crosshead main body 2, it can be performed more easily and accurately than in the past.
[0030]
Next, the optical fiber core wire 101 and the steel wire 102 inserted through the nipple 6 are inserted into the nipple holder 9 from the rear to the front of the crosshead body 2.
[0031]
Subsequently, as shown in FIG. 6, the optical fiber core wire 101 and the steel wire 102 inserted forward of the crosshead main body 2 are inserted into the extrusion hole 4 of the die 3. Then, a die 3 is attached to the front end of the crosshead body 2 from the front. At this time, since the extrusion hole 4 has a sufficiently large cross-sectional area as compared with the optical fiber core wire 101 and the steel wire 102, it is easy to insert the optical fiber core wire 101 and the steel wire 102.
[0032]
Further, as shown in FIG. 7, the nipple 6 is inserted from the rear end side to the front end side of the crosshead body 2. At that time, the guide protrusion 8 of the nipple 6 is engaged with the guide groove 10 of the nipple holder 9. Then, the nipple 6 is slid forward along the traveling direction of the optical fiber core wire 101 and the steel wire 102.
[0033]
After the nipple 6 is inserted inside the crosshead body 2, the nipple 6 is positioned from the rear of the crosshead body 2 by the position regulating member 12.
First, behind the crosshead main body 2, the two half-cylinders 13a (see FIG. 4) are aligned with each other so as to surround the periphery of the optical fiber core wire 101 and the steel wire 102, and the cylindrical position regulating tube 13 is placed. To. Then, the position regulating cylinder 13 is inserted into the nipple holder 9 from the rear end side of the crosshead body 2. As a result, the nipple 6 slides forward, and the guide protrusion 8 of the nipple 6 contacts the front end portion 10 a of the guide groove 10. In this state, the nipple 6 is restricted from moving forward.
[0034]
After the nipple 6 is inserted up to the front end portion 10a, the two half holders 14a (see FIG. 4) are arranged so as to surround the periphery of the optical fiber core wire 101 and the steel wire 102 in the same manner as the position regulating cylinder 13. The cylindrical suction holders 14 are combined with each other. The suction holder 14 is moved from the rear end side of the crosshead main body 2 toward the front side, and the thread 15 is moved until the restricting portion 16 comes into contact with the rear end of the crosshead main body 2 as shown in FIG. Screw into the thread 11 of the nipple holder 9.
Thereby, the passing of the crosshead 1 is completed.
[0035]
As described above, the position restricting cylinder 13 and the suction holder 14 constituting the position restricting member 12 are members that can be divided along the traveling direction of the linear body. There is no need to insert the wire 102 inside. Therefore, before inserting the optical fiber core wire 101 and the steel wire 102 into the nipple 6, the operation of inserting the optical fiber core wire 101 and the steel wire 102 into the position regulating member 12 can be omitted, and the workability is good. is there.
[0036]
【The invention's effect】
As described above, the present invention provides a crosshead and a crosshead wiring method capable of obtaining good workability and accurately passing a plurality of linear bodies through the crosshead. Can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a crosshead of the present invention.
2 is a front view showing a die in FIG. 1. FIG.
FIG. 3 is a front view showing the nipple in FIG. 1;
4 is a perspective view showing a position regulating member in FIG. 1. FIG.
5 is a cross-sectional view showing a state in which a linear body is inserted through the nipple and the crosshead body in FIG. 1. FIG.
6 is a cross-sectional view showing a state in which a die is attached to the crosshead main body in FIG. 1. FIG.
7 is a cross-sectional view showing a state when a nipple is inserted into the nipple holder in FIG. 1. FIG.
FIG. 8 is a cross-sectional view showing an optical fiber cable manufactured by a crosshead.
FIG. 9 is a cross-sectional view showing an example of a conventional crosshead.
10 is a front view showing the nipple in FIG. 9. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cross head 2 Cross head main body 3 Dies 4 Extrusion hole 5 Fixing part 6 Nipple 7 Fiber insertion hole 7a Steel wire insertion hole 8 Guide protrusion (1st guide part)
9 Nipple holder 10 Guide groove (second guide part)
11 Thread 12 Position restriction member 13 Position restriction cylinder 13a Half cylinder 14 Suction holder 14a Half holder 15 Thread 16 Restriction part

Claims (5)

A crosshead body configured in a cylindrical shape through which a plurality of linear bodies can be inserted, a die attached to one end of the crosshead body, and a predetermined distance from the die inside the crosshead body A nipple provided, extruding resin from between the die and the nipple, and collectively covering the resin around the linear body that passes through a plurality of insertion holes provided in the nipple. In a crosshead configured to:
A crosshead characterized in that the nipple is configured to be insertable into the crosshead main body from the other end side of the crosshead main body and is positioned so as to maintain the predetermined distance from the die. 2. The crosshead according to claim 1, wherein a first guide portion is provided on an outer surface of the nipple, and the nipple is engaged with the first guide portion on the inner side of the crosshead main body so that the linear body is engaged with the nipple. A crosshead, characterized in that a second guide portion is provided for guiding along the traveling direction. 2. The crosshead according to claim 1, wherein the nipple is restricted in movement in the other end side direction of the crosshead body by a position restricting member that can be divided along a traveling direction of the linear body. Crosshead characterized by that. When a nipple configured separately from the crosshead main body is mounted inside the crosshead main body configured in a cylindrical shape through which a plurality of linear bodies can be inserted,
After the linear body is inserted through a plurality of insertion holes provided in the nipple, and further inserted through the inside of the crosshead body from the other end side opposite to the one end side where the die is mounted,
A crosshead wire passing method, wherein the nipple is inserted from the other end side of the crosshead body toward the one end side. 5. The crosshead threading method according to claim 4, wherein the nipple is inserted while being slid along the traveling direction of the linear body when the nipple is inserted inside the crosshead main body. How to pass through.

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