JPS63200418A - Cross head of extruder for vertical tape pad molded cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a cable formed by vertically attaching a metal tape such as A or ll to the outer periphery of a core and extruding a resin sheath around the outer periphery. This invention relates to an improvement in the crosshead of an extruder for manufacturing tape longitudinally molded cables.

[Prior Art] One example of the crosshead of a conventional extruder for tape longitudinally molded cables is one constructed as shown in FIG.

That is, the crosshead part 100 is provided with a main body 2 having an injection port 1 through which resin for forming a sheath is injected, and the middle part of this main body 2 is penetrated, and a cylindrical shape is formed in the penetrated part. A sleeve 3 is closely fitted, and the right side of the part of the sleeve 3 that contacts the injection port 1 is formed into a shape with a reduced outer circumference, so that a cylindrical shape is formed between the sleeve 3 and the main body 2. It has a resin flow path 4a.

A nipple holder 6 is fixed to the inner periphery of the sleeve 3, in which a conical cylindrical nipple portion 5 protruding from the tip of the sleeve 3 is formed.

Further, a cylindrical holder 8 with a forming diamond supported at the tip is fitted into the inner circumference of the nipple holder 6.
A guide portion 9 is attached to the base end of the holder 8, through which the tape, core, and core wire are inserted, and serves as a guide for running these. The tip of the forming diamond is positionally regulated by the tip of the nipple part 5,
Further, an opening 5a is formed at the tip of the nipple portion 5, through which a running cable is inserted.

On the other hand, a support part 10 having a stepped hole formed in the inner periphery is fixed to the side surface of the main body 2, and communicates with the resin flow path 4a. A cylindrical resin flow path 4b having an outer diameter of φD is formed by the outer peripheral surface of the nipple holder 6. In addition, the support part 10
A die 11 having a predetermined inclination is provided on the inner circumferential surface of the small diameter stepped portion.
is fixed by a fixing member 12 and a fixing screw 13. The inner periphery of this die 11 is communicated with the resin flow path 4b, and is formed by the inner periphery of the die 11 and the outer periphery of the nipple portion 5, and is inclined toward the running direction of the running cable. Resin channel 4 formed toward the center of the cable
C is formed.

At the tip of this die 11, an opening communicating with the resin flow path 4C is bored, forming resin flow paths 4a and 4b.

A covering molded part 4d is formed in the flow path formed by the distance L' formed by the 4C.
are now communicated.

In the crosshead of a conventional extruder for tape-formed cables having such a configuration, a running cable consisting of a tape, a core, and a core wire is inserted through the guide portion 9.
While the tape travels along the path between the inner circumference of the holder 8, the forming dia, and the opening 5a of the nipple holder 6, the vertical attachment of the tape is completed.

Then, the outer periphery of the traveling cable whose tape has been vertically attached is continuously coated with resin at the resin coating molding part 4d located in the opening of the die 11. That is, injection port 1
a resin flow path 4a formed in a cylindrical shape through which the resin flows;
4b and a resin flow path 4C formed in a conical cylindrical shape to flow into and fill the resin coating molding part 4d, and this resin coating molding part 4
The resin is continuously coated on the outer periphery of the running cable where the tape has been vertically attached at the part d, and a predetermined sheath can be formed.

[Problems to be Solved by the Invention] In the crosshead of such a conventional cable extruder for longitudinally forming tape, the forming dia is located deep inside the crosshead portion 100, and the tape is vertically formed in this part. Since it is additively molded, it is not possible to judge whether or not the tape is properly introduced into the forming dia, and the sheath of the completed cable coated with resin is peeled off by the resin coating section 4d disposed at the next stage. Since it is not possible to inspect whether the tape molding is normal until after this process, there is a risk that the reliability of the cable will be lowered.

In addition, adjustments to forming dia, etc., cannot be made while the cable is running, and each time an adjustment is made, the coating of the completed cable must be peeled off to determine whether the adjustment is appropriate, which significantly reduces adjustment efficiency. There is a problem of putting it away.

Furthermore, since the resin flow paths 4a and 4b are formed in a cylindrical shape and are arranged over a long distance outside the running cable before the tape is longitudinally attached, the resin flow paths 4a and 4b are heated. is transmitted through the sleeve 3, nipple holder 6, and holder 8 to the running cable before the tape is vertically attached, and the tape before the vertical attachment is thermally deformed, so there is a possibility that the covering molding cannot be performed normally. .

SUMMARY OF THE INVENTION Therefore, the purpose of this invention is to provide an extruder for tape longitudinally forming cables that solves the above-mentioned problems, improves cable reliability, improves adjustment efficiency, and does not cause thermal deformation of the tape before longitudinally forming the tape. The purpose is to provide a crosshead.

[Means and effects for solving the problems] The crosshead of the extruder for longitudinal tape molding cables according to the present invention has a monitoring window disposed opposite to the region where the tape is longitudinally molded onto the core. a first flow path formed in a circumferential direction perpendicular to the longitudinal direction of the running cable, and a resin flow path that communicates with the first flow path, and a second channel that is inclined in the direction side and formed toward the center of the running cable, and the outer diameter φD of the first channel and the running cable in the second channel are It is characterized by being formed so that the relationship with the longitudinal distance satisfies φD>L, and by providing a monitoring window, the tape molding state can be observed in real time, and by making the resin flow path thinner, This prevents the tape from deforming due to the heat of the resin.

[Example] Hereinafter, an example of the present invention will be described in detail using FIG. 1. In this embodiment, the same forming diamond and holder 8° guide portion 9 of the conventional example shown in FIG. 2 are used.

In FIG. 1, a crosshead portion 200 is provided with a main body 22 having an injection port 21 through which resin is introduced.
One end of the Zapoto stand 23 is fixed to the side of 2, and the holder 8 is supported at the other end. Further, the middle portion of the main body 22 is penetrated, and a nipple 24 is fixed to the penetrated portion using a nipple holder 25.

The shape of the nipple 24 is such that its inner circumferential surface wraps around the outer circumferential portion of the above-mentioned forming diamond, and has a large diameter portion with a protruding outer circumferential surface. The nipple 24 having such a shape is held by a nipple holder 25 that closely fits along its protruding outer peripheral surface.

Further, an opening 24a is formed at the tip of the nipple 24, through which a cable with a tape attached vertically is inserted, and a female thread is formed in the nipple holder 25, into which a fixing screw 26 is screwed. This ensures that both are firmly fixed.

Further, in a portion of the main body 22 that communicates with the injection port 21, a first flow path 30a is formed in a disk shape in a circumferential direction perpendicular to the longitudinal direction of the running cable. A pot-shaped die 27 is disposed with a predetermined gap from the tip of the nipple 24, and the die 27 is fixed by a thick ring-shaped support plate 28. A second flow path is formed on the facing surface of the die 27 and the nipple 24, which is connected to the first flow path 30a and is inclined in the running direction of the running cable and directed toward the center of the running cable. A path 30b is formed. Roughly speaking, at the tip of the die 27 mentioned above,
Resin-coated molded portion 30c communicating with the second flow path 30b
is formed.

Therefore, the first flow path 30a and the second flow path 30b constitute a resin flow path, which communicates with the resin coating molded portion 30c.
is constructed.

The relationship between the outer diameter φD of the first flow path 30a and the distance in the longitudinal direction of the running cable in the second flow path 30b is set to satisfy φD>L.

On the other hand, a monitoring window 31 having a transparent window portion is disposed opposite a portion of the forming dia where the tape is vertically attached.

In the crosshead of the extruder for tape-formed cables of this embodiment configured in this way, the running cable consisting of the tape, core and core wire is inserted into the guide part 9, and this is connected to the inner peripheral part of the holder 8 and the forming diaphragm. The vertical attachment of the tape is completed while the tape travels along the path of the opening 24a of the nipple holder 24.

Then, the outer periphery of the traveling cable whose tape has been vertically attached is continuously coated with resin at the resin coating molding part 30c located in the opening of the die 27. That is, the resin is kneaded by a screw (not shown), flows into the injection port 21 via a breaker plate, etc., passes through the first flow path 30a formed in the shape of a disk, and then flows into the second flow path 30 shaped like a conical tube.
The resin flows into and fills the resin coating molding part 30G through b, and in this resin coating molding part 30G, the resin is continuously coated on the outer periphery of the running cable on which the tape has been vertically attached to form a predetermined sheath. It can be done.

Further, since a monitoring window 31 is provided, it is possible to monitor the state of tape forming by the forming diamond from this part. Therefore, it is possible to judge whether the cable is running normally or not, and to judge whether the position adjustment of the nipple 24 or the die 27 is appropriate or not, while monitoring in real time.

[Effects of Invention □] As described above, according to the present invention, it is possible to determine whether or not the tape introduction in the forming die is normal, thereby improving the reliability of the cable.

Further, since the position of the forming die etc. can be adjusted in real time while the cable is running, the adjustment efficiency can be significantly improved.

Roughly speaking, since the resin flow path is arranged only over a short distance of a part of the running cable before the tape is attached vertically, the heat of the resin is transferred to the tape before the tape is attached vertically, causing thermal deformation of the tape. disappears.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a crosshead of an extruder for tape longitudinally molded cables showing an embodiment of the present invention, and FIG. 2 is a schematic sectional view of a crosshead of an extruder for tape longitudinally molded cables showing a conventional example. FIG. 7... Forming die 8... Holder 9... Guide section 21... Inlet port 22... ...Body 24...Niraful 14a...Opening hole 25...Nipple holder 27...
...Die 28...Support plate 30a...First channel 30b...Second channel 30G... ......Resin coating molding part 31...
...Monitoring window 200...Cross head part φD...
...Outer diameter L of the first flow path ......Second
Longitudinal distance of the running cable in the flow path of

Claims (1)

[Claims] In the crosshead of an extruder that continuously coats the outer periphery of a running cable with a tape longitudinally attached to the core with resin, the crosshead is disposed opposite to the part where the tape is longitudinally attached to the core. the resin flow path is in communication with a first flow path formed in a circumferential direction perpendicular to the longitudinal direction of the traveling cable; a second flow path inclined in the running direction of the running cable and formed toward the center of the running cable; the outer diameter φD of the first flow path; The relationship with the longitudinal distance L of the running cable in is φD>
A crosshead of an extruder for tape longitudinally molded cable, characterized in that it is formed to satisfy L.