JP2012121251A - Resin coating apparatus and resin coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin-coated wire rod which can be identified by appearance at a low manufacturing cost in a resin coating apparatus.SOLUTION: The resin coating apparatus 1 is provided with: a coating means 4 which continuously coats the whole periphery of a traveling metal wire rod W with a first resin 3 along the longitudinal direction of the metal wire rod; and a projection forming means 7 which forms a plurality of intermittent resin projections 6 by intermittently coating a part of the periphery of the coated metal wire rod where the coating layer of the first resin 3 is formed by the coating means 4 with a second resin 5 along the longitudinal direction.

Description

  The present invention relates to a resin coating apparatus and a resin coating method for coating a surface of a metal wire with a resin.

A technique for coating the surface of a metal wire material (bar material, wire material or pipe material) such as copper or steel with a thermoplastic resin such as PVC or PE is conventionally known. Such a metal wire is coated with a thermoplastic resin by a resin coating apparatus for the wire.
By the way, a wire coated with such a thermoplastic resin (hereinafter referred to as a resin-coated wire) has no outstanding feature in appearance after coating, and thus it is very difficult to distinguish by appearance. In particular, some AC power cables and signal cables are made by twisting together a plurality of resin-coated wires to form a single cable. With such cables, there is a desire to simplify the identification of resin-coated wires in wiring work. Is strong. For this reason, a technique has been developed in which such a resin-coated wire having no distinctive appearance is provided with a mark such as a protrusion to obtain a resin-coated wire having excellent discrimination.

  For example, Patent Literature 1 discloses a resin-coated wire material that has a “protrusion continuous in the longitudinal direction” formed on the surface of the resin-coated wire material to improve the discrimination of the resin-coated wire material. The technique of Patent Document 1 supplies a second resin different from the resin disposed on the surface of a metal wire, for example, a resin containing a colorant or the like in a molten state in a resin coating apparatus. In the apparatus of Patent Document 1, the second resin extruded from the auxiliary extruder is superposed on the first resin inside the crosshead body, and is extruded from the resin flow path while being superposed. The surface is covered.

JP 05-84611 A

By the way, since the resin-coated wire in Patent Document 1 is formed with continuous protrusions, more resin is required than that without forming protrusions. With reference to the drawing of Patent Document 1, only a relatively small protrusion is shown. However, if the width of the protrusion is formed to be as wide as that of the metal wire or the height is further increased, A lot of resin is required. However, Patent Document 1 does not propose any means for suppressing the amount of resin used.
This invention is made in view of the above-mentioned problem, and it aims at providing the resin coating apparatus and the resin coating method which can suppress the usage-amount of resin of the resin coating wire material in which protrusion was formed in the outer periphery. To do.

In order to solve the above problems, the resin coating apparatus of the present invention takes the following technical means.
That is, the resin coating apparatus of the present invention includes a coating unit that continuously coats the entire circumference of the traveling metal wire along the longitudinal direction of the metal wire, and the first coating by the coating unit. Protrusion formation for forming a plurality of resin protrusions intermittently by covering the part of the periphery of the resin-coated wire with the resin coating layer formed thereon intermittently with the second resin along the longitudinal direction. Means are provided.

The protrusion forming means includes a recess that forms the resin protrusion, and a mold that can be repeatedly opened and closed in a closed state that covers the entire periphery of the resin-coated wire and an open state that is separated from the peripheral surface, And a resin supply portion that supplies the molten second resin into the recess facing the surface of the first resin coating layer when the mold is in a closed state. preferable.
And a pulling means that can be switched between a traveling state in which the metal wire travels and a stopped state in which the traveling of the metal wire is temporarily stopped. It is preferable that the second resin is supplied into the recess of the mold when the mold is in a closed state.

Furthermore, it is more preferable that the protrusion forming means has a mold moving part that moves the mold along the traveling direction of the metal wire.
Furthermore, the mold moving unit returns to the origin by moving the mold in the same direction at the same speed as the metal wire and moving the mold in a direction opposite to the direction in which the metal wire travels. The protrusion forming means is configured to switch the second resin in the recess of the mold when the mold moving portion is in a synchronized state and the mold is in a closed state. May be configured to supply.
On the other hand, in the resin coating method of the present invention, the first resin is continuously coated along the longitudinal direction of the metal wire while the metal wire travels along the longitudinal direction. In the resin coating method, the second resin is intermittently coated along the longitudinal direction with respect to a part of the periphery of the resin-coated wire formed with the coating layer of the first resin. A plurality of resin protrusions are formed intermittently.

In addition, a mold having a recess for forming the resin projection and capable of being repeatedly opened and closed in a closed state covering the entire periphery of the resin-coated wire and an open state spaced from the peripheral surface is prepared, In the closed state, the resin protrusion is preferably formed by supplying a molten second resin into the recess facing the surface of the first resin coating layer.
In addition, it is possible to switch between a traveling state in which the metal wire travels and a stopped state in which the traveling of the metal wire is temporarily stopped, and when the metal mold is in a closed state in the stopped state, It is preferable to supply the second resin.

  Furthermore, it is possible to switch between a synchronized state in which the mold is moved in the same direction at the same delivery speed as the metal wire, and a return state in which the mold is moved in the opposite direction to the direction in which the metal wire travels to return to the origin. Alternatively, the second resin may be supplied into the recess of the mold when the mold is in the synchronized state and the mold is in the closed state.

  According to the resin coating apparatus and the resin coating method of the present invention, the amount of resin used in the resin-coated wire having protrusions formed on the outer periphery can be suppressed.

It is front sectional drawing which shows typically the resin coating apparatus of 1st Embodiment. It is the sectional view on the AA line of FIG. It is a figure which shows the process of the resin coating method of 1st Embodiment. It is a perspective view which shows typically the resin coating wire manufactured using the resin coating apparatus of 1st Embodiment. (A) is a front view which shows typically the resin coating apparatus of 2nd Embodiment, (b) is the BB sectional drawing of (a). It is a figure which shows the process of the resin coating method of 2nd Embodiment.

[First Embodiment]
Hereinafter, embodiments of a resin coating apparatus 1 according to the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the overall configuration of a resin coating apparatus 1 according to the first embodiment.
The resin coating apparatus 1 according to the first embodiment travels by being pulled by a take-up machine (not shown) that can take up a coated wire capable of running the metal wire W along its longitudinal direction, and by the take-up machine. The entire circumference of the metal wire W is provided with covering means 4 for covering with the first resin 3. Further, the resin coating apparatus 1 applies the second resin 5 to the surface of the coating layer in the longitudinal direction with respect to a part of the periphery of the coated wire in which the coating layer of the first resin 3 is formed by the coating means 4. Protrusion forming means 7 for forming a plurality of resin protrusions 6 intermittently extending in the longitudinal direction of the coated wire on which the coating layer of the first resin 3 is formed is provided by intermittently building up (covering) the first resin 3. Yes.

In the following description, the resin coating apparatus 1 of the present embodiment performs coating while moving (running) the metal wire W horizontally from the left side to the right side in FIG. Is the upstream side when the apparatus is described, and the right side of the sheet of FIG. 1 is the downstream side when the apparatus is described. Further, the upper and lower sides in FIG. 1 are the upper and lower sides when describing the apparatus.
The metal wire W which is a target for coating the resin in the resin coating apparatus 1 is a long material (wire material, plate material, bar material or pipe material) formed of a metal such as copper or steel. Although the metal wire W of this embodiment is made of copper and has a rectangular cross-sectional shape, the cross-sectional shape of the metal wire W may be, for example, round (circular) or ring-shaped. Can be a solid bar or plate, or a hollow pipe.

A take-up machine (not shown) for moving the metal wire W along the horizontal direction is provided on the downstream side of the crosshead body 8 described later, and by taking up the coated wire after coating the metal wire W, It is to be sent horizontally toward the downstream side (right side in FIG. 1). The metal wire W thus moved by the take-up machine passes through the covering means 4.
The covering means 4 covers the periphery of the metal wire W with the first resin 3. The covering means 4 includes a metal core 10 that guides the metal wire W, a die 11 that covers the entire circumference of the metal wire W guided by the metal core 10, and the core metal 10 and the die. 11 and the cross head body 8 (the main body of the covering means 4).

  Specifically, the cored bar 10 is a member having a shape such that the funnel is laid down horizontally, a large-diameter cylindrical part 10a that opens to a large diameter, and a small-diameter cylindrical part that opens to a smaller diameter than the large-diameter cylindrical part 10a 10b, and a conical cylinder part 10c disposed between the large diameter cylinder part 10a and the small diameter cylinder part 10b. The cored bar 10 is arranged such that the large-diameter cylindrical portion 10a opened to the large diameter faces the upstream side and the small-diameter cylindrical portion 10b opened to the small diameter faces the downstream side.

  The cross head body 8 is formed thick using a material such as a metal so as to withstand the pressure applied from the melted first resin 3. Inside the cross head body 8, a cavity is formed in accordance with the outer shape of the cored bar 10 (the outer shape of the upstream side of the large-diameter cylindrical part 10a and the conical cylindrical part 10c). The tip of the small-diameter cylindrical portion 10b of the cored bar 10 protrudes from the cross head body 8 toward the downstream side.

  The cavity of the cross head body 8 is formed to have a size slightly larger than the outer shape of the core metal 10, and a gap is formed between the inner peripheral surface of the cross head body 8 and the outer peripheral surface of the core metal 10. A gap formed between the cross head body 8 and the cored bar 10 is a flow path through which the melted first resin 3 can flow. An extruder (not shown) is provided on the upstream side of the flow path, and the first resin 3 plasticized by the extruder is supplied to the flow path.

On the other hand, the die 11 is disposed so as to be fitted into a portion on the downstream side of the cross head body 8. A cavity is also formed in the die 11 according to the outer shape of the cored bar 10 (the outer shape on the downstream side of the conical cylindrical part 10c and the small-diameter cylindrical part 10b), and the small-diameter cylindrical part 10b of the cored bar 10 is formed in this cavity. Is housed.
The cavity of the die 11 is also formed in a size slightly larger than the outer shape of the core metal 10, and a gap is formed between the inner peripheral surface of the die 11 and the outer peripheral surface of the core metal 10. The gap formed between the die 11 and the core metal 10 is also a flow path through which the melted first resin 3 can flow, and the first resin 3 flowing through the flow path is downstream of the die 11. Extruded from the side surface.

In the covering means 4 described above, the die 11 is put on the portion 10b protruding toward the downstream side of the core metal 10 and the die 11 is inserted into the cross head body 8 from the downstream side. The opening (surface facing the downstream side) is fixed with a die holding member 12 so as to cover it.
In the covering means 4 having such a configuration, the first resin 3 that has passed through the flow path in the crosshead body 8 is pushed out from the downstream surface of the die 11 and passes through the core 10. Thus, the metal wire W (hereinafter referred to as a resin-coated wire) that is continuously coated in the longitudinal direction with the first resin 3 is manufactured.

By the way, about the resin-coated wire manufactured in this way, there is one in which a band-shaped projection (resin projection 6) is further formed on the coating layer of the first resin 3.
Therefore, in the resin coating apparatus 1 of the present invention, the periphery (surface) of the resin-coated wire material on which the coating layer is formed by the coating means 4 described above is intermittently coated with the second resin 5 along the longitudinal direction. Further, there is further provided a protrusion forming means 7 for intermittently forming a plurality of resin protrusions 6 formed in a raised shape with the second resin 5 in the longitudinal direction.

Next, the protrusion forming means 7 will be described in detail.
As shown in FIGS. 1 and 2, the protrusion forming means 7 is arranged adjacent to the downstream side of the covering means 4 described above. The protrusion forming means 7 includes a recess 13 for forming the resin protrusion 6, a mold that can be repeatedly opened and closed in a closed state that covers the entire periphery of the coated wire and an open state that is spaced from the peripheral surface, and a mold And a resin supply unit 14 for supplying the melted second resin 5 to the concave portion 13 of the mold when in the closed state.

  The mold constituting the protrusion forming means 7 is composed of a moving mold and a fixed mold. In the present embodiment, a lower mold 17 is provided as a fixed mold, and an upper mold 16 is provided as a moving mold. The upper surface of the lower mold 17 is formed to match a part of the outer periphery of the resin-coated wire, and the resin-coated wire can be placed on the upper surface. In the illustrated example where the cross-sectional shape of the resin-coated wire is rectangular, the lower mold 17 is formed in a flat plate shape, and the upper surface thereof is formed in a flat surface. When the resin protrusion 6 is formed, the height position of the lower mold 17 is fixed in a state where the lower mold 17 is placed on a mold support base 18 that can be adjusted in the vertical direction.

  As shown in FIG. 2, the upper mold 16 is a block-like member, and a groove portion 19 that opens downward is formed on the lower surface thereof. The groove portion 19 is formed on the lower surface of the upper mold 16 in accordance with the shape of the upper surface of the resin-coated wire so as to extend linearly from the upstream side toward the downstream side. Therefore, when the upper mold 16 is lowered and superimposed on the lower mold 17, the resin-coated wire material enters and is accommodated in the groove portion 19 of the upper mold 16.

  On the other hand, as shown in FIG. 1, a recess 13 is formed on the upper surface of the groove 19 of the upper mold 16 so as to be recessed further upward from the groove 19. The recess 13 has a shape corresponding to a resin protrusion 6 to be described later. In the case of this embodiment, the resin protrusion 6 having a rectangular parallelepiped shape (a shape as shown in FIG. 4A) can be formed. ing. An opening of a resin guide hole 20 for supplying the melted second resin 5 is formed on the upper surface of the recess 13 (on the side opposite to the opening of the recess 13).

In addition, when the upper mold 16 is lowered and stacked on the lower mold 17 between the upper mold 16 and the lower mold 17, the upper mold 16 and the lower mold 17 are resin-coated. Positioning pins 21 for positioning both molds in the horizontal direction are provided so as to form a shape that matches the cross-sectional shape of the wire.
The resin supply unit 14 dissolves the second resin 5 and supplies it to the concave portion 13. The resin supply unit 14 is formed so as to penetrate vertically inside the upper mold 16 and guides the second resin 5. A guide hole 20 and a resin supply nozzle 22 for supplying the melted second resin 5 to the resin guide hole 20 are provided.

  A gate valve 23 is provided at the opening of the resin guide hole 20 formed on the upper surface of the recess 13 described above. The gate valve 23 can block the flow of the second resin 5 with respect to the recess 13. When the gate valve 23 is opened, the recess 13 can be filled with the melted second resin 5. In addition, a resin supply nozzle 22 of an injection molding machine is provided above the upper mold 16 so that the second resin 5 injected from the resin supply nozzle 22 can be supplied to the resin guide hole 20. In other words, the gate valve 23 has a structure including a slidable gate member in the middle of the resin flow path in order to open or close the resin flow path (resin guide hole 20). Then, the flow of the resin can be stopped or allowed to flow as it is by opening and closing the resin flow path by moving the gate member back and forth by mechanical power (power source is not shown) from the outside.

  The configuration of the gate valve 23 is not limited to the above example, and a gate member that can rotate in the middle of the resin flow path is provided in order to open or close the resin flow path (resin guide hole 20). When the gate member is rotated by mechanical power from the outside, the flow path formed in the gate member does not communicate with the resin flow path (resin guide hole 20) like a rotary valve. It may be configured to switch between an open state communicating with the resin and stop the flow of the resin or allow it to flow as it is. Further, the rotatable gate member may be configured to open and close the resin flow path like a butterfly valve.

In the upper mold 16 and the lower mold 17, a cooling water flow path 24 through which cooling water flows is formed in order to quickly cool the extruded resin and enable efficient formation of the resin protrusions 6. .
The mold opening / closing part 15 opens and closes the mold by moving the moving mold while guiding it. In the present embodiment, the mold opening / closing part 15 has a closed state in which the upper mold 16 is guided up and down and the concave portion 13 of the upper mold 16 is opposed to the coating layer, and an open state that is separated from the peripheral surface of the coating layer. It can be repeated alternately. The mold opening / closing part 15 is provided at four positions of the upper mold 16 (four positions so as to surround the resin guide hole 20 in a balanced manner on a horizontal plane) and guides the upper mold 16 along the vertical direction. 25 and a rack and pinion type lifting mechanism 26 that moves the upper mold 16 in the vertical direction relative to the lower mold 17.

The slide rail 25 is a rod-like member having an L-shaped cross section in a horizontal cross section, and is attached so as to be erected along the vertical direction, and restricts the movement of the upper mold 16 along the horizontal direction. However, the upper mold 16 can be guided up and down.
The elevating mechanism 26 includes a rack portion 27 linearly provided on the side surface of the upper mold 16 and a pinion gear 28 that meshes with the rack portion 27 and moves the upper mold 16 up and down. The upper mold 16 can be moved up and down relative to the lower mold 17 by rotating and driving the pinion gear 28 using an electric motor or the like, so that the mold composed of the upper mold 16 and the lower mold 17 can be opened and closed. It is like that.

Next, a method of forming the resin protrusion 6 using the above-described protrusion forming means 7 while performing resin coating on the metal wire W, in other words, a resin coating method of the present embodiment will be described.
As shown in FIGS. 3A to 3D, the resin coating method of the present embodiment causes the metal wire W to travel along the longitudinal direction, and is then melted on the surface of the traveling metal wire W. The first resin 3 is continuously extruded, and the first resin 3 is continuously coated in the longitudinal direction while covering the entire surface of the metal wire W with the first resin 3. 3 by intermittently covering the surface of the resin 3 with the second resin 5, the resin protrusions 6 formed in a raised shape on the surface of the first resin 3 are intermittently formed in the longitudinal direction. To form.

Specifically, resin coating is performed according to the following procedure.
As shown in FIG. 3A, the metal wire W is taken from the downstream side by a take-up machine (not shown), traveled (moved) along the horizontal direction, and melted on the surface of the traveling metal wire W. 1 resin 3 is extruded, and the surface of the metal wire W is covered with the first resin 3 over the entire circumference.
Next, as shown in FIG. 3 (b), the upper mold 16 is lowered using the mold opening / closing part 15, and the mold is closed (closed state).

In this state, the resin-coated wire (metal wire W) continuously moves (runs continuously) at a predetermined delivery speed, and the surface of the resin-coated wire is not stopped unless the movement of the resin-coated wire is temporarily stopped. The resin protrusion 6 cannot be formed on the surface.
Therefore, in the resin coating method according to the first embodiment, it is possible to switch between a traveling state in which the metal wire W is continuously taken and traveled by the above-described take-up machine and a stopped state in which the take-up of the metal wire W is temporarily stopped. Make it available for selection. When the stop state is selected, the second resin 5 is supplied into the concave portion 13 of the mold in the closed state, and the concave portion 13 is filled with the second resin 5 to form the resin protrusion 6.

That is, as shown in FIG. 3C, in order to form the resin protrusion 6, the traveling of the metal wire W is temporarily stopped (stopped) when the mold is in the closed state.
Next, as shown in FIG. 3C, the gate valve 23 is opened and the second resin 5 is introduced into the recess 13 of the upper mold 16. If it does so, the recessed part 13 will be filled with the 2nd resin 5, the resin protrusion 6 will be formed with the 2nd resin 5, and the resin protrusion 6 will be joined to a coating layer.

  As shown in FIG. 3D, when the recess 13 is filled with the second resin 5 and the resin protrusion 6 is formed on the coating layer, the gate valve 23 is closed, the upper mold 16 is raised, and the mold is opened. After changing to the open state (open state), the take-up of the metal wire W is resumed to change the metal wire W from the stopped state to the running state. Thereafter, by repeating the operations of FIGS. 3A to 3D described above, a plurality of resin protrusions 6 are disposed in the longitudinal direction with respect to a part of the periphery of the resin-coated wire on which the coating layer is formed. It becomes possible to form intermittently.

As shown in FIG. 4A, the resin protrusions 6 formed on the surface of the resin-coated wire in which the coating layer is formed on the metal wire W by the above-described resin coating method are intermittent in the longitudinal direction of the metal wire W. A plurality are provided. If the resin protrusions 6 are formed intermittently in the longitudinal direction of the metal wire W in this way, the amount of resin necessary for forming the protrusions can be reduced compared to that formed continuously.
The example described above is an example in which the resin protrusion 6 is formed on the surface of the resin-coated wire using the rectangular metal wire W. However, as shown in FIG. The resin protrusions 6 can also be formed on the surface of the resin-coated wire using the wire W.

The second resin 5 described above may be a different type of resin or the same type of resin as long as it can be integrated with the first resin 3 by molding. The second resin 5 may be the same color as the first resin 3 or may be a different color.
As described above, by using the resin coating apparatus 1 according to the first embodiment, it is possible to reduce the amount of resin used in the resin-coated wire having protrusions formed on the outer periphery.
“Second Embodiment”
Next, the resin coating apparatus 1 of 2nd Embodiment is demonstrated.

As shown in FIGS. 5A and 5B, the resin coating apparatus 1 according to the second embodiment does not form the resin protrusions 6 in a state in which the travel of the metal wire W is temporarily stopped. By moving the forming means 7 in synchronization with the metal wire W, the resin protrusion 6 is formed with the relative speed with respect to the metal wire W temporarily set to zero.
Specifically, the protrusion forming means 7 of the second embodiment moves the mold in the direction of feeding the metal wire W in addition to the mold, the resin supply unit 14 and the mold opening / closing unit 15. A portion 29 is provided. Then, the surface of the resin-coated wire on which the coating layer is formed (surrounding) when the mold moving unit 29 is in a synchronized state in which the mold in the closed state is moved in the same direction at the same delivery speed as the metal wire W The resin projection 6 is formed on a part of the mold, and after the formation of the resin projection 6 is finished, the mold in the open state is moved in the direction opposite to the feeding direction to shift to the return state where the mold is returned to the origin. That is, in the resin coating method of the second embodiment, the surface of the coating layer is repeatedly formed by alternately repeating the return state when the mold is in the open state and the synchronized state when the mold is in the closed state. The resin protrusions 6 are formed intermittently in the longitudinal direction.

Below, the metal mold | die moving part 29 and the resin coating method of 2nd Embodiment performed using this metal mold | die moving part 29 are demonstrated in detail.
The mold moving unit 29 is provided with a mold, a resin supply unit 14, and a mold opening / closing unit 15 for the covering unit 4 including the cored bar 10, the crosshead body 8, and the die 11 having substantially the same configuration as that of the first embodiment. The projection forming means 7 is made to move horizontally and reciprocally between the upstream side and the downstream side. The mold moving unit 29 includes a slider 30 that supports the protrusion forming means 7 from below and a receiving base 31 that guides the slider 30 in the left-right direction. The mold moving unit 29 is provided with a drive mechanism 36 that moves the slider 30 so as to reciprocate in the horizontal direction with respect to the cradle 31.

Among the members constituting the mold moving unit 29, the receiving base 31 is a base whose position is fixed, and is a base-like member whose upper surface is a flat surface. A guide groove 33 having a substantially U-shaped cross section that opens upward is formed on the upper surface of the pedestal 31. The guide groove 33 is formed horizontally from the upstream side toward the downstream side.
The slider 30 is a plate-like member disposed on the upper side of the cradle 31. As shown in FIG. 5B, the slider 30 has such a width that the side surface is guided by the guide groove 33, and moves in the guide groove 33 so that a part of the lower side is buried in the groove. It is possible. Further, a flat surface is formed on the lower surface of the slider 30, and the flat surface is brought into contact with the bottom surface of the guide groove 33 in a surface state. With this configuration, the slider 30 can be guided horizontally in the upstream direction or the downstream direction.

On the upper side of the slider 30, the above-described upper mold 16 (moving mold), lower mold 17 (fixed mold), resin supply unit 14, and mold opening / closing unit 15 are placed. It is possible to move while placing the member. Further, the slide rail 25 similar to that of the first embodiment is provided on the upper surface of the slider 30, and the lower mold 17 faces a pin clamp portion 35 described later provided on the upper mold 16. A plurality of clamp pins 34 extending upward are provided.
These clamp pins 34 are respectively inserted into pin clamp portions 35 provided on the upper mold 16. As a result, the clamp means for clamping the upper mold 16 and the lower mold 17 by locking the clamp pin 34 with the pin clamp portion 35 is configured.

  A rack and pinion type drive mechanism 36 is provided between the slider 30 and the cradle 31. The drive mechanism 36 is attached to the pedestal 31 while rotating the rack portion 37 formed on the side surface of the slider 30 from upstream to downstream, the pinion gear 38 meshing with the rack portion 37, and the pinion gear 38. Drive motor 39. In the drive mechanism 36, when the pinion gear 38 is driven to rotate in a desired direction by the drive motor 39, the rack portion 37 moves horizontally while meshing with the pinion gear 38, and the slider 30 to which the rack portion 37 is fixed moves to the cradle 31. On the other hand, it can move in either the upstream direction or the downstream direction.

  In addition, in the resin coating apparatus 1 of 2nd Embodiment, the L-shaped protrusion part 40 which protrudes below is attached to the side of the upper metal mold | die 16. As shown in FIG. And the rack part 27 of the raising / lowering mechanism 26 is formed in the side surface of this protrusion part 40 along an up-down direction. A pinion gear 28 is engaged with the rack portion 27, and when the pinion gear 28 is rotationally driven by an electric motor or the like, the upper mold 16 moves up and down to open and close the mold.

Next, a method for forming the resin protrusion 6 using the resin coating apparatus 1 of the second embodiment, in other words, a resin coating method of the second embodiment will be described.
As shown in FIGS. 6A to 6F, the resin coating method of the second embodiment causes the metal wire W to travel along the longitudinal direction and then travels in the same manner as in the first embodiment. The first resin 3 melted on the surface of the metal wire W to be extruded is extruded, and the first resin 3 is continuously coated over the entire circumference of the metal wire W in the longitudinal direction. The surface of the resin 3 is intermittently covered with the second resin 5 along the longitudinal direction, whereby the resin protrusions 6 formed in a raised shape with the second resin 5 are formed on the surface of the first resin 3. A plurality are formed intermittently in the longitudinal direction. The resin coating method of the second embodiment is different from that of the first embodiment in that the metal wire W is made to run while being continuously drawn by a take-up machine, and the protrusion forming means 7 is synchronized with the metal wire W. Thus, the resin protrusions 6 are formed with the relative speed of the protrusion forming means 7 with respect to the metal wire W temporarily reduced to zero.

First, as shown to Fig.6 (a), the 1st resin 3 fuse | melted by the surface of the metal wire W which runs along a horizontal direction is extruded, and the 1st resin 3 is used for the perimeter of the metal wire W. Covering continuously and longitudinally.
In this state, the metal wire W is drawn continuously (continuously) at a predetermined traveling (take-off) speed by the take-up machine, and thus, with respect to the metal wire W having a speed difference from the mold. The resin protrusion 6 cannot be molded unless the speed difference is eliminated.

Therefore, in the resin coating method according to the second embodiment, the protrusion forming means 7 is formed using the mold moving unit 29 at the same speed as the traveling (take-up) speed of the metal wire W and in the same direction as the traveling direction of the metal wire W. Move.
As shown in FIG. 6B, if the speed difference between the mold and the metal wire W disappears by starting the movement of the mold moving part 29 at the same time when the mold is closed, the same as in the stopped state. Thus, the concave portion 13 of the mold can be reliably opposed to a desired position on the surface of the coating layer. Then, as shown in FIG. 6C, when the gate valve 23 is opened as in the first embodiment, the concave portion 13 of the upper mold 16 is filled with the second resin 5, and the first resin 3 is filled. The resin protrusion 6 can be easily formed on the surface (part of the periphery) of the resin-coated wire on which the coating layer is formed.

As shown in FIG. 6D, when the resin protrusion 6 is formed on the coating layer, the gate valve 23 is closed and the upper mold 16 is raised.
Then, as shown in FIG. 6E, when the upper mold 16 is raised to a predetermined height at which the resin protrusion can be taken out of the mold and opened, the slider 30 is moved in a direction opposite to the traveling direction. . Then, as shown in FIG. 6 (f), the slider 30 is moved toward the original position to return to the state shown in FIG. 6 (a).

Thereafter, the slider 30 moves in the traveling direction as shown in FIGS. 6 (b) to 6 (c) and stops at the movement limit as shown in FIGS. 6 (d) to 6 (f). By repeating the return state in which the slider 30 is moved in the direction opposite to the traveling direction, a plurality of resin protrusions 6 can be intermittently formed in the longitudinal direction on the surface of the coating layer.
As described above, by using the resin coating apparatus 1 of the second embodiment, the amount of resin necessary for forming the protrusions is continuously formed in continuously manufacturing the resin-coated wire having the protrusions. It can be reduced compared to things.
The present invention is not limited to the above embodiments, and the shape, structure, material, combination, cross-sectional shape of the metal wire, the shape of the resin protrusion, etc. can be appropriately changed without changing the essence of the invention. is there.

DESCRIPTION OF SYMBOLS 1 Resin coating apparatus 2 Sending means 3 1st resin 4 Covering means 5 2nd resin 6 Resin protrusion 7 Protrusion forming means 8 Crosshead body 9 Sending roller 10 Core metal 10a Large diameter cylinder part of 10a core metal 10b Small diameter of core metal Tube portion 10c Conical tube portion of core metal 11 Die 12 Die restraining member 13 Recess 14 Resin supply portion 15 Pressing portion 16 Upper die 17 Lower die 18 Mold support base 19 Groove portion 20 Resin guide hole 21 Positioning pin 22 Resin supply nozzle DESCRIPTION OF SYMBOLS 23 Gate valve 24 Cooling water flow path 25 Slide rail 26 Elevating mechanism 27 Rack part 28 Pinion gear 29 Mold moving part 30 Slider 31 Receptacle 33 Guide groove 34 Clamp pin 35 Pink lamp part 36 Drive mechanism 37 Rack part of drive mechanism 38 Drive mechanism Pinion gear 39 Drive mechanism drive motor 40 Projection end W Metal wire rod

Claims (9)

Coating means for continuously coating the first resin along the longitudinal direction of the metal wire with respect to the entire circumference of the traveling metal wire,
A plurality of resins intermittently covered by covering the part of the periphery of the resin-coated wire, on which the first resin coating layer is formed by the coating means, along the longitudinal direction with the second resin. A resin coating apparatus comprising a protrusion forming means for forming a protrusion. The protrusion forming means
A mold that includes a recess that forms the resin protrusion, and a mold that can be repeatedly opened and closed in a closed state that covers the entire periphery of the resin-coated wire and an open state that is spaced from the peripheral surface,
A resin supply section for supplying a molten second resin into the recess facing the surface of the first resin coating layer when the mold is in a closed state;
The resin coating apparatus according to claim 1, comprising: A take-up means capable of switching between a running state in which the metal wire is run and a stopped state in which the running of the metal wire is temporarily stopped;
The protrusion forming means is configured to supply a second resin into the recess of the mold when the take-up means is in a stopped state and the mold is in a closed state. The resin coating apparatus according to claim 2.   The resin coating apparatus according to claim 2, wherein the protrusion forming unit includes a mold moving unit that moves the mold along a direction in which the metal wire travels. The mold moving unit is a synchronized state in which the mold is moved in the same direction at the same speed as the metal wire, and a return state in which the mold is moved in a direction opposite to the direction in which the metal wire travels to return to the origin. And can be switched to
The protrusion forming means is configured to supply the second resin into the recess of the mold when the mold moving unit is in a synchronized state and the mold is in a closed state. The resin coating apparatus according to claim 4. In the resin coating method of continuously coating the first resin along the longitudinal direction of the metal wire with respect to the entire circumference of the metal wire while running the metal wire along the longitudinal direction,
The second resin is intermittently coated along the longitudinal direction with respect to a part of the periphery of the resin-coated wire on which the coating layer of the first resin is formed. A resin coating method characterized by forming a resin protrusion. A mold that can be repeatedly opened and closed in a closed state that covers the entire periphery of the resin-coated wire and an open state that is spaced apart from the peripheral surface, is provided with a recess that forms the resin protrusion.
When the mold is in a closed state, a resin protrusion is formed by supplying a melted second resin into the recess facing the surface of the first resin coating layer. The resin coating method according to claim 6. It is possible to switch between a running state for running the metal wire and a stopped state in which the running of the metal wire is temporarily stopped,
The resin coating method according to claim 7, wherein the second resin is supplied into the recess when the mold is in a stopped state and the mold is in a closed state. Switching between a synchronous state in which the mold is moved in the same direction at the same speed as the traveling speed of the metal wire and a return state in which the mold is moved in the opposite direction to the traveling direction of the metal wire to return to the origin Every
The resin coating method according to claim 8, wherein the second resin is supplied into the concave portion of the mold when the mold is in a synchronized state and the mold is in a closed state.