JP2015196366A - Resin coating device and resin coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably coat a resin with uniform film thickness around a rectangular conductor.SOLUTION: A nozzle unit 12 of a resin coating device is configured in such a way that guide means 26 rotates a nozzle 14 which is rotatably held by nozzle holding means 22 so as to follow twisting of a rectangular conductor 80 inserted into the nozzle 14. The nozzle 14 and a die 16 are rotatably integrated and coupled by coupling means 28, and the die 16 is rotatably held by die holding means 24. Therefore when the nozzle 14 is rotated, the die 16 and the nozzle 14 rotates together in an integrated state. Thereby the rectangular conductor 80 passes through a center position of a passage hole 31 of a die plate 30 without inclination, so that the resin can be coated over whole periphery of the rectangular conductor 80 with uniform film thickness.

Description

  The present invention relates to a resin coating apparatus and a resin coating method.

  A motor coil used as a motor for an automobile or the like is configured by plastically processing a rectangular conductor wire coated with a resin and then incorporating it into a laminated core. In order to improve the performance of the motor, the rectangular conductor wire used for the motor coil is twisted on a plurality of assembled conductor wires and rolled into a rectangular shape, and a resin (enamel or PPS) that covers the periphery of the aggregate conductor wire. Etc.) is extruded to coat the insulating resin with a uniform film thickness. At this time, the assembly conductor wire that has been twisted and rolled into a rectangular cross section is subjected to heat treatment before resin molding, and the resin is supplied to the surroundings while maintaining the heat generated by the heating. However, the twisted collective conducting wire passes through the resin injection nozzle in a state where the twisting stress is released by the heat treatment and the twisting is returned. For this reason, the collective conducting wire passes through the outlet portion at the nozzle tip with an inclination with respect to the rectangular cross section, and may be damaged by contact with the outlet portion at the nozzle tip, and the insulating resin film thickness is not uniform. There is a risk of becoming. As a countermeasure to such a problem, a method is disclosed in which the collective conducting wire is guided by a guide roller before the nozzle tip, and the collective conducting wire passes through the central position of the outlet portion of the nozzle tip without inclination (for example, Patent Documents 1 to 3).

JP-A-9-213146 JP 2005-254561 A Japanese Utility Model Publication No. 2-137225

However, although the method described above can pass the collective conductor without contacting the outlet portion at the tip of the nozzle, when looking at the overall conveyance of the collective conductor that is unwound, heated, coated with resin, etc. The twisting force generated by the twisting return due to the heat treatment is gradually accumulated in the guide roller. For this reason, damage is generated in the collective conducting wire in the guide roller, and the quality of the resin coating may deteriorate due to this influence. Furthermore, when the amount of accumulated force reaches the limit, the guide roller may be damaged, the assembly conductor may meander during the heat treatment, or the like.
The present invention has been made in view of the above problems, and an object thereof is to stably coat a resin with a uniform film thickness around a flat conductor.

(Aspect of the Invention)
The following aspects of the present invention exemplify the configuration of the present invention, and will be described separately for easy understanding of various configurations of the present invention. Each section does not limit the technical scope of the present invention. Therefore, while considering the best mode for carrying out the invention, some of the constituent elements in each section are replaced, deleted, or further added with other constituent elements. It can be included in the range.

  (1) A nozzle having a flat opening through which a flat conductor is inserted at a conical tip and a die provided with a conical hole corresponding to the shape of the tip of the nozzle are inserted into the nozzle and conveyed. A device for coating the rectangular conductor with resin by a nozzle unit that supplies molten resin to the periphery of the rectangular conductor through a gap between the tip of the nozzle and the conical hole of the die. The unit is guided by a plane of the rectangular conductor, nozzle holding means for holding the nozzle so as to be rotatable and movable in the axial direction, die holding means for holding the die so as to be rotatable, and the nozzle is supported by the flat conductor. A resin coating apparatus comprising: guide means for rotating to follow the twist of the nozzle; and connecting means for connecting the nozzle and the die so as to be integrally rotatable.

  (2) In the above item (1), the die has a die plate attached to the small diameter side of the conical hole and provided with a passage hole for the flat conductor, and the nozzle unit moves the nozzle in the axial direction. A moving mechanism that moves the nozzle to the tip side by the moving mechanism, thereby blocking a gap formed between the tip portion and the die plate, and the molten resin with respect to the rectangular conductor The supply control means for stopping the supply and the moving mechanism moves the nozzle to the side opposite to the tip, thereby pulling out the tip from the tip through a gap formed between the tip and the die plate. A supply path for supplying a molten resin around the rectangular conductor, and the nozzle and the die are connected to the die of the nozzle by the connecting means. While allowing axial movement, a resin coating device which is rotatably connected integrally (claim 2).

  (3) In the above items (1) and (2), the guide means is a plurality of rollers having a shaft fixed inside the nozzle and rotating in close contact with two opposing flat surfaces of the rectangular conductor, The connecting means includes a protrusion provided on the outer periphery of the tip of the nozzle, and a recess provided in the conical hole of the die so as to engage with the protrusion. When the roller rotates along the rectangular conductor, the nozzle is rotated in the twisting direction of the rectangular conductor via the rotation axis of the roller, and the recess is provided via the protrusion that follows the nozzle. A resin coating apparatus configured such that the formed die rotates synchronously with the nozzle (Claim 3).

  (4) In the above item (3), the protrusion has a semicircular plate shape provided with a semicircular main surface facing the rotation direction of the nozzle, and the recess has a shape following the protrusion. The supply path is formed between a circumferential surface that forms a semicircular circumference of the projection and the recess, and the semicircular main surface of the projection is A resin coating apparatus configured to be slidable in contact with the opposing surface of the recess (Claim 4).

  (5) In the above item (4), when the supply control means stops the supply of the molten resin to the rectangular conductor, the supply control means moves the nozzle to the tip side so that the peripheral surface of the protrusion and the depression A resin coating apparatus that controls the moving mechanism so as to press the tip portion against the die plate while securing a gap between the tip and the die plate.

  (6) In the above items (1) to (5), further, a transport unit that intermittently transports the flat conductor drawn from the nozzle unit, a supply of molten resin by the nozzle unit, and the flat angle by the transport unit. A resin coating apparatus including a control means for synchronously controlling the conveyance of the conductor (Claim 6).

  (7) A resin coating apparatus as set forth in (1) to (6) above, wherein the flat conductor is a collective conducting wire (claim 7).

  (8) A nozzle having a flat opening through which a flat conductor is inserted into a conical tip, a die provided with a conical hole corresponding to the shape of the tip of the nozzle, and the nozzle can be rotated and moved in the axial direction. Nozzle holding means for holding the die, die holding means for holding the die rotatably, guide means guided by the flat surface of the rectangular conductor, and rotating the nozzle so as to follow the twist of the rectangular conductor; Twist of the rectangular conductor that is inserted into the nozzle and conveyed by the nozzle unit using a resin coating apparatus that includes a nozzle unit that includes a connecting unit that rotatably connects the nozzle and the die integrally. In a state in which the nozzle and the die are integrally rotated so as to follow, the gap between the tip portion of the nozzle and the conical hole of the die is used. Resin coating method of supplying around the rectangular conductor molten resin (claim 8).

  (9) In the above item (8), the guide means is a plurality of rollers having a shaft fixed inside the nozzle and rotating in close contact with two opposing flat surfaces of the rectangular conductor, and the connecting means is A protrusion provided on the outer periphery of the tip of the nozzle, and a recess provided in the conical hole of the die so as to be engaged with the protrusion. By rotating a plurality of rollers along the rectangular conductor, the nozzle is rotated in the torsional direction of the rectangular conductor via the rotating shaft of the roller, and the depression is formed via the protrusion following the nozzle. A resin coating method in which the die provided with is rotated in synchronization with the nozzle.

  (10) In the above items (8) and (9), the resin coating apparatus includes a transport unit that intermittently transports the rectangular conductor inserted through the nozzle of the nozzle unit, and synchronizes the nozzle unit and the transport unit. A step of controlling and transporting the rectangular conductor while supplying molten resin around the rectangular conductor, a step of conveying the rectangular conductor in a state where supply of the molten resin is stopped, and the flat angle between these steps. And a step of stopping both the conveyance of the conductor and the supply of the molten resin, and a resin coating apparatus that repeats the steps.

  Since this invention was comprised in this way, it becomes possible to coat | cover resin stably with a uniform film thickness around a flat conductor.

It is the schematic which shows the structure of the resin coating apparatus which concerns on embodiment of this invention. It is a cross-sectional image figure which shows the nozzle unit of the resin coating apparatus of FIG. FIG. 3 is a cross-sectional perspective view of the vicinity of a nozzle tip of the nozzle unit of FIG. 2. It is a perspective view which shows the nozzle front-end | tip of the nozzle unit of FIG. FIG. 3 is a cross-sectional perspective view selectively showing a plurality of rollers of the nozzle unit of FIG. 2. It is sectional drawing in the rotating shaft of the some roller of FIG. FIGS. 3A and 3B are cross-sectional image diagrams for explaining the nozzle opening / closing operation of the nozzle unit of FIG. 2, in which FIG. It is a graph which shows the relationship of the timing of supply of molten resin and conveyance of a rectangular conductor in the resin coating method which concerns on embodiment of this invention. FIGS. 2A and 2B show a rectangular conductor in which resin is intermittently coated, in which FIG. 3A is a perspective view in a state where three resin coating portions are provided, and FIG. 2B is a perspective view in the vicinity of the boundary between the resin coating portion and the non-covering portion. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, detailed description of the same or corresponding parts as those of the prior art will be omitted. In the following description, a case where a collective conducting wire in which a plurality of conducting wires are twisted and rolled into a rectangular shape is used as a flat conductor will be described as an example unless otherwise specified.
FIG. 1 schematically shows a resin coating apparatus 10 according to an embodiment of the present invention. As illustrated, the resin coating apparatus 10 includes a nozzle unit 12, a transport unit 60, a resin melting unit 64, and a control means 70.
The nozzle unit 12 supplies molten resin around the rectangular conductor 80 while guiding the rectangular conductor 80 inserted therein, and includes the moving mechanism 32, the supply control means 74, the heater shown in FIG. The detailed configuration will be described later.

The transport unit 60 sandwiches the flat conductor 80 by a clamp 62 that can be shifted, and intermittently transports the flat conductor 80 in the direction d1 in the drawing. That is, in the state where the flat conductor 80 is clamped by the clamp portion 62, the clamp portion 62 is shifted and moved in the direction d1 in the drawing, or the clamp portion 62 is clamped in the d2 direction in the state where the flat conductor 80 is not clamped by the clamp portion 62. The rectangular conductor 80 is intermittently transported in the direction d1 in the drawing by combining the operation of shifting 62 and the like.
The resin melting unit 64 melts the resin pellets that are input to the input unit 66 and supplies the molten resin to the nozzle unit 12.
Further, the control means 70 controls the resin coating apparatus 10. For example, synchronous control between the supply of molten resin to the rectangular conductor 80 by the nozzle unit 12 and the conveyance of the rectangular conductor 80 by the conveying unit 60 is performed. I do. Specifically, it is composed of various computers.

Next, FIG. 2 shows a detailed configuration of the nozzle unit 12 shown in FIG. The nozzle unit 12 is roughly constituted by a nozzle 14, a die 16, a resin supply shaft 44, a body 46, a heater 50 and the like. Further, although not shown in FIG. 2, the nozzle unit 12 includes a moving mechanism 32 that moves the nozzle 14 in the axial direction (left-right direction in FIG. 2) and the moving mechanism 32 as shown in FIG. Supply control means 74 for controlling the control. The supply control unit 74 may be included in the control unit 70, for example.
As shown in FIG. 2, the nozzle 14 has a conical tip 18 and a rotating shaft 42 that can move and rotate integrally, and a rectangular conductor 80 is inserted inside. The nozzle 14 is held inside the resin supply shaft 44 by a nozzle holding means 22 having an appropriate bearing structure so as to be rotatable about the axis line and movable in the left-right direction in the figure. Guide means 26 is provided inside the tip 18 of the nozzle 14.

  A resin supply shaft 44 is fixedly disposed inside the left side of the body 46 in the drawing, and a die 16 is placed inside the right side of the body 46 in the drawing by the die holding means 24 having an appropriate bearing structure. It is rotatably held as a central axis. The die 16 is provided with a conical hole 20 corresponding to the shape of the tip 18 of the nozzle 14, and a die plate 30 provided with a passage hole 31 through which the flat conductor 80 passes. With such a configuration, the tip 18 of the nozzle 14 is located in the conical hole 20 of the die 16. Further, the nozzle 14 and the die 16 are connected so as to be integrally rotatable by connecting means 28 described in detail later.

  Further, the rectangular conductor 80 inserted through the nozzle 14 is drawn from the tip end portion 18 to the transport unit 60 (see FIG. 1) through the passage hole 31 of the die plate 30. The through hole 31 of the die plate 30 has a predetermined size that is uniform in the circumferential direction between the flat conductor 80 and the inner periphery of the through hole 36 in a state where the flat conductor 80 that is not coated with resin is inserted. It is formed in a size and shape so as to ensure a gap. Furthermore, a heater 50 is installed on the right side of the die 16 in the drawing so as to heat the die plate 30.

  Next, a route for supplying the molten resin around the rectangular conductor 80 in the nozzle unit 12 will be described. As shown in FIG. 2, the body 46 is provided with a molten resin flow path 48 for introducing the molten resin 82 supplied from the resin melting unit 64 (see FIG. 1) into the body 46. Furthermore, a supply path 34 communicating with the molten resin flow path 48 is provided between the outer peripheral portion of the resin supply shaft 44 accommodated in the body 46 and the inner wall of the body 46. It continues to the gap between the tip 18 of the nozzle 14 and the conical hole 20 of the die 16. Accordingly, the molten resin 82 supplied from the resin melting unit 64 to the nozzle unit 12 passes through the molten resin flow path 48, passes through the supply path 34, and is a rectangular conductor 80 drawn from the tip end portion 18 of the nozzle 14. To reach around.

  Next, the guide means 26 and the connection means 28 of the nozzle unit 12 will be described in detail. In the resin coating apparatus 10 according to the embodiment of the present invention, as shown in FIG. 3, the connecting member 28 includes two protrusions 38 provided on the outer periphery of the tip 18 of the nozzle 14 and a conical hole of the die 16. 20 and two indentations 40 provided in 20. As can be seen in FIGS. 3 and 4, the two protrusions 38 are provided at rotationally symmetric positions with the axis of the nozzle 14 as the central axis, and each of them has a semicircular main shape in the rotational direction of the nozzle 14. It is a semicircular plate shape with the surface 38a facing. The two recesses 40 are provided so as to engage with the protrusions 38 of the tip 18 located in the conical hole 20, and each has a shape following the protrusion 38 of the semicircular plate shape, Between the surface 40b facing the peripheral surface 38b of the protrusion 38 and the peripheral surface 38b, a gap is secured. More specifically, regardless of the position of the nozzle 14 that moves in the axial direction with respect to the die 16, a gap is secured between the peripheral surface 38 b of the protrusion 38 and the surface 40 b of the recess 40 that faces the peripheral surface 38 b. It is formed in size.

And the clearance gap between the peripheral surface 38b of the projection part 38 and the surface 40b of the hollow 40 facing this is a molten resin with the clearance gap between the front-end | tip part 18 of the nozzle 14, and the conical hole 20 of the die | dye 16. 82 supply paths 34 are formed.
On the other hand, the main surface 38a of the protrusion 38 is configured to be in sliding contact with the surface 40a of the recess 40 facing the main surface 38a when the nozzle 14 moves in the axial direction with respect to the die 16.
As shown in FIG. 4, the tip end 18 of the nozzle 14 faces the outer periphery of the tip from which the flat conductor 80 is drawn out toward a plane 80 a that forms the long side of the rectangular cross section of the flat conductor 80. The taper part 18a which inclines and is provided is provided.

  In the resin coating apparatus 10 according to the embodiment of the present invention, the guide means 26 is composed of a plurality of rollers 36. As can be seen in FIGS. 5 and 6, a total of eight rollers 36 are provided for each rotation shaft 36 a in the illustrated example, and each rotation shaft 38 a is fixed to the tip 18 of the nozzle 14. Has been. Each of the rollers 36 has a hook shape on one end side in the rotation axis direction. As shown in FIG. 6, in the pair of rollers 36, the left end side of the roller 36 on the left side in the drawing has a hook shape, The right end side of the roller 36 has a bowl shape. With such a shape, the pair of rollers 36 on the upper side in the drawing rotate in such a manner that the peripheral surface is in close contact with the upper plane 80 a of the flat conductor 80 and the flat conductor 80 is sandwiched between the flanged portions of the left and right rollers 36. . Similarly, the pair of rollers 36 on the lower side in the drawing rotate in such a manner that the peripheral surface is brought into close contact with the lower plane 80 a of the flat rectangular conductor 80 and the rectangular conductor 80 is sandwiched between the flanged portions of the left and right rollers 36.

Accordingly, the four rollers 36 shown in FIG. 6 rotate so as to sandwich the flat conductor 80 from above, below, left and right. The guide means 26 is configured such that two sets of such four rollers 36 are arranged before and after the flat conductor 80 is pulled out.
For convenience of explanation, in FIG. 5, the tip 18 of the nozzle 14 is not shown, and the roller 36 and the flat conductor 80 are shown without being cut. In FIG. 6, the axis of the nozzle 14 is shown. As a center, a member outside the supply path 34 is not shown.

Next, an operation in which the nozzle 14 and the die 16 of the nozzle unit 12 rotate integrally so as to follow the twist of the flat conductor 80 will be described.
When the flat conductor 80 inserted into the nozzle 14 is pulled out by the transport unit 60, the twist direction and angle of the flat conductor 80 gradually change. As described above, the plurality of rollers 36 constituting the guide means 26 have the rotation shaft 36a fixedly installed at the tip 18 of the nozzle 14, and are in close contact with the flat surface 80a of the flat conductor 80, so It rotates so as to sandwich the conductor 80. Further, the nozzle 14 is rotatably held by the nozzle holding means 22. Therefore, assuming that the flat conductor 80 is twisted in the clockwise direction of FIG. 6 in accordance with the pulling out of the flat conductor 80, for example, the plurality of rollers 36 rotating along the flat conductor 80 are As shown in FIG. 80, the nozzle 14 is rotated in the clockwise direction so that the right side in the drawing is inclined downward.

  Then, along with the rotation of the nozzle 14, the protrusion 38 of the connecting member 28 provided at the tip 18 of the nozzle 14 as shown in FIGS. 3 and 4 draws a circular locus in the rotation direction of the nozzle 14. Move to. Here, as described above, since the main surface 38a of the projection 38 is in sliding contact with the opposing surface 40a of the recess 40 of the connecting member 28, the recess 40 is directly formed by the movement of the projection 38. Is transmitted to the die 16. Further, since the die 16 is rotatably held by the die holding means 24, when the rotation of the nozzle 14 is transmitted through the connecting means 28, the same direction of rotation as the nozzle 14 (that is, clockwise in FIG. 6). Direction) by the same rotation angle as the nozzle 14. The nozzle unit 12 of the resin coating apparatus 10 rotates the nozzle 14 and the die 16 integrally so as to follow the twist of the flat conductor 80 in this way.

Next, the nozzle opening / closing operation of the nozzle unit 12 will be described with reference to FIG.
FIG. 7A shows a state in which the nozzle is closed. The supply control means 74 controls the moving mechanism 32, the nozzle 14 is moved to the right side in the drawing by the moving mechanism 32, and the tip end portion 18 is in the die plate 30. It is pressed against. In this state, since there is no gap between the tip 18 and the die plate 30, the molten resin 82 is not supplied from the tip of the nozzle 14 to the periphery of the rectangular conductor 80 that passes through the passage hole 31 of the die plate 30. The molten resin 82 stagnates in the supply path 34. As can be seen in FIG. 7A, even when the nozzle is closed, there is a gap as the supply path 34 between the peripheral surface 38b of the protrusion 38 and the opposing surface 40b of the recess 40. It is secured.

  On the other hand, FIG. 7B shows a state in which the nozzle is open. The nozzle 14 is moved to the left side in the drawing by the moving mechanism 32, and a gap having a width x is formed between the tip 18 and the die plate 30. A part of the flat conductor 80 is exposed in the conical hole 20. In this state, since the supply path 34 is expanded to the gap between the tip portion 18 and the die plate 30, the molten resin 82 flows into this gap, and around the flat conductor 80 exposed in the conical hole 20, Molten resin 82 is supplied. The nozzle unit 12 controls the supply of the molten resin 82 that has reached the periphery of the tip 18 of the nozzle 14 to the rectangular conductor 80 as described above.

Next, a resin coating method according to an embodiment of the present invention that is executed using the resin coating apparatus 10 described above will be described along a time t in the graph shown in FIG.
FIG. 8 shows the relationship between the supply amount s of the molten resin 82 by the nozzle unit 12 and the transport speed v of the flat conductor 80 by the transport unit 60 when the flat conductor 80 is coated with the resin using the resin coating apparatus 10. It is the graph shown with time. FIG. 9 shows an example of a rectangular conductor 80 in which the resin 84 is intermittently coated by this resin coating method. The resin 84 is obtained by cooling and curing the molten resin 82.

When checking from the left side to the right side of the graph of FIG. 8 in order, first, in the state where the supply of the molten resin 82 by the nozzle unit 12 is stopped (see FIG. 7A), the rectangular conductor 80 is moved at a predetermined speed by the transport unit 60. After transporting by v2 and transporting the rectangular conductor 80 for a predetermined length, the transport is stopped (step S2). Through the steps so far, the uncovered portion B1 (see FIG. 9A) is formed on the flat conductor 80. Further, both the supply of the molten resin 82 and the conveyance of the flat conductor 80 are stopped for a predetermined time (step S3).
Next, the supply of the molten resin 82 by the nozzle unit 12 is started (see FIG. 7B), and at the same time, the transport of the flat conductor 80 by the transport unit 60 is started. Then, with the molten resin 82 supplied in a predetermined amount, the rectangular conductor 80 is conveyed at a predetermined speed v1, and the rectangular conductor 80 is conveyed for a predetermined length, and then the supply of the molten resin 82 and the conveyance of the rectangular conductor 80 are stopped. (Step S1). Through the steps so far, the covering portion A1 of the resin 84 (see FIG. 9A) is formed on the flat conductor 80. Further, both the supply of the molten resin 82 and the conveyance of the flat conductor 80 are stopped for a predetermined time (step S3).

Thereafter, a step S2 of transporting the rectangular conductor 80 with the supply of the molten resin 82 stopped, a step S1 of transporting the rectangular conductor 80 with the molten resin 82 supplied, and the melting resin 82 provided between these steps. Step S3 for stopping both the supply and the conveyance of the rectangular conductor 80 is repeated. Then, as shown in FIG. 9A, a non-covering portion B2, a covering portion A2, a non-covering portion B3, a covering portion A3,... Are formed in order, and the rectangular conductor 80 is intermittently covered with the resin 84.
The relationship between the supply of the molten resin 82 by the nozzle unit 12 and the conveyance of the flat conductor 80 by the conveyance unit 60 is achieved by synchronously controlling the nozzle unit 12 and the conveyance unit 60 by the control means 70. The

  Now, according to the embodiment of the present invention configured as described above, the following operational effects can be obtained. That is, in the resin coating apparatus 10 according to the embodiment of the present invention, the nozzle unit 12 is configured as shown in FIG. 2, so that the guide unit 26 is rotatably held by the nozzle holding unit 22. Is rotated so as to follow the twist of the rectangular conductor 80 inserted through the nozzle 14. That is, since the twisted flat conductor 80 is gradually moved in the right direction in FIG. 2 by the transport unit 60 (see FIG. 1), the twist direction and angle gradually change. The nozzle 14 is rotated so as to follow. Thereby, since the rectangular conductor 80 passes through the center position of the rectangular opening 18b (see FIG. 4) of the nozzle tip 18 without inclination, it is possible to prevent damage due to rubbing.

  Further, since the nozzle 14 and the die 16 are connected together by the connecting means 28 so as to be integrally rotatable, the die 16 is rotated together with the nozzle 14. Accordingly, since the flat conductor 80 passes through the center position of the passage hole 31 of the die plate 30 without inclination, the resin 84 (see FIG. 9) can be coated with a uniform film thickness over the entire circumference of the flat conductor 80. . The guiding means 26 is not guided so as to suppress the twist of the flat conductor 80 but is guided so as to follow the twist along the flat surface 80a (see FIG. 4) of the flat conductor 80. For this reason, the twisting force of the rectangular conductor 80 is not accumulated in the guide means 26, and the resin 84 can be stably coated.

Further, in the resin coating apparatus 10 according to the embodiment of the present invention, as shown in FIGS. 5 and 6, a plurality of rollers 36 as guide means 26 are inserted into the nozzle 14 inside the nozzle 14. The flat conductor 80 rotates in close contact with two opposing flat surfaces 80a. Then, the nozzle 14 is rotated in the twisting direction of the flat conductor 80 via the rotation shaft 36 a of the roller 36 fixed inside the nozzle 14. Thus, by rotating the nozzle 14 via the plurality of rollers 36, the nozzle 14 can be rotated more reliably so as to follow the twist of the flat conductor 80.
Further, as shown in FIGS. 3 and 4, the protrusion 38 provided on the outer periphery of the tip 18 of the nozzle 14 is moved so as to draw a circular locus by the rotating nozzle 14. A die 16 having an indentation 40 to be engaged rotates in synchronization with the nozzle 14. Therefore, simultaneously with the rotation of the nozzle 14 via the guide means 26, it is possible to efficiently transmit the rotation of the nozzle 14 to the die 16 by the connecting means 28 having the protrusion 38 and the recess 40.

  Further, in the resin coating apparatus 10 according to the embodiment of the present invention, the protrusions 38 and the recesses 40 of the connecting means 28 are formed as shown in FIGS. For this reason, the semicircular plate-shaped protrusion 38 has a semicircular circumferential surface 38b and a recess 40 formed in the shape of the protrusion 38 and larger than the protrusion 38. The supply path 34 for supplying the molten resin 82 is formed. This eliminates the need for the molten resin 82 flowing in the gap between the tip 18 of the nozzle 14 and the conical hole 20 of the die 16 to flow around the tip of the nozzle 14 while avoiding the protrusion 38, and the protrusion It flows through the supply path 34 between the peripheral surface 38 b of the plate 38 and the recess 40. Furthermore, the supply path 34 between the peripheral surface 38b of the protrusion 38 and the recess 40 has a smooth arch shape. Therefore, the molten resin 82 is supplied more smoothly than when there is no gap between the peripheral surface 38b of the protrusion 38 and the recess 40, or when the protrusion 38 has a rectangular plate shape with a corner. It becomes possible.

  Further, the semicircular main surface 38 a of the protrusion 38 is configured to be slidable in contact with the facing surface 40 a of the recess 40. For this reason, the movement of drawing the circular locus of the protrusion 38 accompanying the rotation of the nozzle 14 is caused by the movement of the die 16 even though the protrusion 38 can move in the axial direction of the nozzle 14 inside the recess 40. It is transmitted directly to the recess 40. Thereby, the axial movement of the nozzle 14 with respect to the die 16 and the synchronous rotation of the nozzle 14 and the die 16 can be efficiently made compatible, and the rotation following the twist of the flat conductor 80 of the nozzle 14 and the die 16 is prevented. The supply and supply stop of the molten resin 82 can be controlled without any problems.

  Furthermore, as shown in FIG. 4, the resin coating apparatus 10 according to the embodiment of the present invention is provided with a tapered portion 18 a at the tip 18 of the nozzle 14. Here, since the flat conductor 80 includes a plane 80a having a long side of a rectangular cross section and a plane 80b having a short side, the flat conductor 80 is longer than the distance from the tip of the tip 18 to the plane 80a of the flat conductor 80. Similarly, the distance from the flat conductor 80 to the flat surface 80b is shorter. For this reason, in the nozzle open state of the nozzle unit 12, the molten resin 82 flowing through the supply path 34 between the conical tip 18 of the nozzle 14 and the conical hole 20 of the die 16 extends in the circumferential direction of the rectangular conductor 80. May be reached at different flow rates. That is, there is a difference in the flow velocity at which the molten resin 82 is supplied between the flat surface 80a and the flat surface 80b of the flat conductor 80, so that the coating thickness ta of the flat surface 80a and the coating thickness tb of the flat surface 80b (FIG. 9 ( b)) may not be the same.

  However, as shown in FIG. 4, the resin coating apparatus 10 according to the embodiment of the present invention is inclined toward the flat surface 80 a that forms the long side of the rectangular section of the flat conductor 80 at the tip portion 18 of the nozzle 14. A tapered portion 18a is provided. Thereby, for example, when the nozzle unit 12 shifts from the closed state to the open state, the distance from the molten resin 82 to the plane 80a that forms the long side of the rectangular cross section of the rectangular conductor 80 from the flow blocking portion, Similarly, the distance until the flat conductor 80 reaches the flat surface 80b that forms the short side of the rectangular cross section is substantially equal. For this reason, there is no difference in the flow velocity at which the molten resin 82 is supplied between the flat surface 80a and the flat surface 80b of the flat conductor 80. Accordingly, the coating thickness ta of the flat surface 80a and the coating thickness tb of the flat surface 80b can be made the same size. As a result, the flat conductor 80 can be more accurately and uniformly uniform in the circumferential direction. It becomes possible to coat the resin.

  Further, in the resin coating apparatus 10 according to the embodiment of the present invention, when the supply of the molten resin 82 is stopped by the nozzle unit 12, as shown in FIG. 7A, the supply control means 74 (see FIG. 1). ) To control the moving mechanism 32 (see FIG. 1) to move the nozzle 14 to the tip side (right side in the figure). And the clearance gap formed between the front-end | tip part 18 and the die plate 30 is interrupted | blocked. On the other hand, when the molten resin 82 is supplied to the flat conductor 80, the nozzle 14 is moved to the opposite side (left side in the drawing) by the moving mechanism 32 and formed between the tip 18 and the die plate 30. The molten resin 82 is supplied around the rectangular conductor 80 via the supply path 34 including the gap. That is, by forming a shut valve that opens and closes the supply path 34 of the molten resin 82 with the tip portion 18 of the nozzle 14 and the die plate 30, the supply and supply stop of the molten resin 82 can be accurately controlled.

  Furthermore, since the nozzle unit 12 includes the heater 50 for heating the die plate 30, the temperature of the molten resin 82 flowing in the vicinity of the die plate 30 where the supply path 34 is opened and closed is increased. The viscosity is lowered. Accordingly, the occurrence of stringing of the molten resin 82 can be suppressed with respect to the opening and closing movement of the nozzle tip 18 with respect to the die plate 30, and the supply control of the molten resin 82 can be performed more accurately. .

  Further, as shown in FIG. 7A, the resin coating apparatus 10 according to the embodiment of the present invention controls the moving mechanism 32 by the supply control means 74 when the supply of the molten resin 82 is stopped. The tip 18 of the nozzle 14 is pressed against the die plate 30. However, even when the supply of the molten resin 82 is stopped in this way, a gap serving as the supply path 34 is ensured between the peripheral surface 38 b of the protrusion 38 and the opposing surface 40 b of the recess 40. Thereby, in the state which stopped supply of the molten resin 82, the molten resin 82 does not stagnate between the projection part 38 and the hollow 40, and the shut valve formed by the tip part 18 of the nozzle 14 and the die plate 30 As a result, the supply path 34 for the molten resin 82 is cut off. Therefore, when starting the supply from the state where the supply of the molten resin 82 is stopped, as shown in FIG. 7B, when the nozzle 14 is moved to the side opposite to the tip by the moving mechanism 32, The molten resin 82 can be supplied without stagnation around the drawn rectangular conductor 80.

  Further, the resin coating apparatus 10 according to the embodiment of the present invention is configured as shown in FIG. 1 by synchronously controlling the nozzle unit 12 and the transport unit 60 by the control means 70 with the configuration shown in FIG. As shown, the rectangular conductor 80 is intermittently coated with a resin 84. That is, the supply and stop of the molten resin 82 to the rectangular conductor 80 by the nozzle unit 12 and the intermittent conveyance of the rectangular conductor 80 by the conveying unit 60 are appropriately synchronously controlled without reducing the coating accuracy of the resin 84. The rectangular conductor 80 can be intermittently coated with the resin 84.

  Further, the resin coating apparatus 10 according to the embodiment of the present invention coats the collective conducting wire as a flat conductor 80, and the collective conducting wire is a plurality of conducting wires 86 as can be confirmed in FIG. 9B. The cross section is rolled into a rectangle by twisting. Although this collective conducting wire tends to be twisted back due to the heat treatment before the resin coating, the resin coated apparatus 10 also has the above-described effects on the collective conducting wire. is there.

  On the other hand, the resin coating method according to the embodiment of the present invention using the resin coating apparatus 10 includes the nozzle unit 12 that intermittently supplies the molten resin 82 and the transport unit 60 that intermittently transports the flat conductor 80 as described above. The control means 70 controls the synchronization. 8 and 9, the rectangular conductor 80 is intermittently coated with the resin 84 by repeating the following steps. That is, in the step S1 of providing the covering portion A (A1 to A3) of the resin 84 on the flat conductor 80, the transport unit 60 is supplied while supplying the molten resin 82 at a predetermined supply amount around the flat conductor 80 by the nozzle unit 12. Thus, the rectangular conductor 80 is conveyed by a predetermined length at which the covering portion A is provided at a predetermined speed v1. Further, in the step S2 of providing the rectangular conductor 80 with the non-coated portion B (B1 to B3) of the resin 84, the feeding of the molten resin 82 by the nozzle unit 12 is stopped and the rectangular conductor 80 is not covered by the transport unit 60. The rectangular conductor 80 is conveyed by a predetermined length for providing the part B. When the process proceeds from the step S1 for providing the covering part A to the process S2 for providing the non-covering part B, and when the process proceeds from the process S2 for providing the non-covering part B to the process S1 for providing the covering part A. The process goes through step S3 in which both the conveyance of the rectangular conductor 80 by 60 and the supply of the molten resin 82 by the nozzle unit 12 are stopped.

  Thus, when the process proceeds from the step S1 for providing the covering portion A to the step S2 for providing the non-covering portion B through the stopping step S3 described above, the supply of the molten resin 82 is stopped and the non-covering portion B is thus stopped. Is started. For this reason, the occurrence of stringing of the molten resin 82 due to the viscosity or the like can be prevented, and the boundary from the covering portion A to the non-covering portion B can be accurately formed. Furthermore, in the case where the process proceeds from the step S2 for providing the non-covered portion B to the step S1 for providing the covered portion A through the stopping step S3, the supply of the molten resin 82 is started, and for the covering portion A. The conveyance is started. For this reason, the boundary from the non-covering part B to the covering part A is accurately formed by appropriately setting the rising of the supply amount s of the molten resin 82 with respect to the rising of the conveying speed v of the flat conductor 80. be able to. Accordingly, the rectangular conductor 80 can be intermittently coated with the resin 84 without reducing the coating accuracy of the resin 84.

  In the resin coating apparatus 10 according to the embodiment of the present invention, the guide means 26 is not limited to the plurality of rollers 36 as shown in FIGS. 5 and 6, and the flat surface 80 a of the rectangular conductor 80 or What is necessary is just to be guided by 80b and to rotate the nozzle 14 so as to follow the twist of the flat conductor 80. Furthermore, only one protrusion 38 of the connecting means 28 may be provided on the outer periphery of the tip 18 of the nozzle 14, or three or more may be provided. The number of the recesses 40 of the connecting means 28 is only required to be provided in the conical hole 20 of the die 16 as many as the protrusions 38.

  DESCRIPTION OF SYMBOLS 10: Resin coating apparatus, 12: Nozzle unit, 14: Nozzle, 16: Dice, 18: Tip part, 18b: Flat opening, 20: Conical hole, 22: Nozzle holding means, 24: Dice holding means, 26: Guide means , 28: connecting means, 30: die plate, 31: passage hole, 32: moving mechanism, 34: supply path, 36: roller, 36a: rotating shaft, 38: protrusion, 38a: main surface, 38b: peripheral surface, 40: depression, 40a: facing surface, 60: transport unit, 70: control means, 74: supply control means, 80: flat conductor, 80a, 80b: plane, 82: molten resin, 84: resin, 86: conductor

Claims (8)

The flat conductor, which includes a nozzle having a flat opening through which a flat conductor is inserted into a conical tip, and a die provided with a conical hole corresponding to the shape of the tip of the nozzle, and is inserted into the nozzle and conveyed. An apparatus for covering the rectangular conductor with a nozzle unit that supplies molten resin through a gap between the tip of the nozzle and the conical hole of the die,
The nozzle unit is guided by a flat surface of the rectangular conductor, nozzle holding means for holding the nozzle so as to be rotatable and movable in the axial direction, die holding means for holding the die so as to be rotatable, and A resin coating apparatus comprising: guide means for rotating so as to follow twist of a flat conductor; and connection means for connecting the nozzle and the die so as to be integrally rotatable. The die has a die plate attached to the small diameter side of the conical hole and provided with a passage hole for the flat conductor,
The nozzle unit includes a moving mechanism that moves the nozzle in the axial direction. By moving the nozzle to the tip side by the moving mechanism, a gap formed between the tip portion and the die plate is formed. It is formed between the tip portion and the die plate by shutting off and stopping the supply of molten resin to the flat conductor, and by moving the nozzle to the side opposite to the tip by the moving mechanism. A supply path for supplying a molten resin to the periphery of the rectangular conductor drawn from the tip portion through a gap;
2. The resin coating apparatus according to claim 1, wherein the nozzle and the die are connected to each other so as to be integrally rotatable while allowing the nozzle to move in the axial direction of the nozzle with respect to the die. . The guide means is a plurality of rollers having a shaft fixed inside the nozzle and rotating in close contact with two opposing flat surfaces of the flat conductor,
The connecting means includes a protrusion provided on the outer periphery of the tip of the nozzle, and a recess provided in the conical hole of the die so as to engage with the protrusion.
The protrusions that follow the nozzle by rotating the nozzle in the twisting direction of the rectangular conductor via the rotation shaft of the roller by rotating the plurality of rollers along the rectangular conductor inside the nozzle. 3. The resin coating apparatus according to claim 1, wherein the die provided with the depression is configured to rotate synchronously with the nozzle through the first and second recesses. The protrusion is a semicircular plate shape provided with a semicircular main surface facing the rotation direction of the nozzle,
The indentation is formed to be larger than the protrusion in a shape that follows the protrusion,
The supply path is formed between a circumferential surface forming a semicircular circumference of the projection and the recess, and the semicircular main surface of the projection is slidable in contact with the opposing surface of the recess. 4. The resin coating apparatus according to claim 3, wherein the resin coating apparatus is configured as follows.   The supply control means, when stopping the supply of molten resin to the rectangular conductor, moving the nozzle to the tip side, while ensuring a gap between the peripheral surface of the projection and the recess, The resin coating apparatus according to claim 4, wherein the moving mechanism is controlled so as to press the tip portion against the die plate.   Furthermore, it includes a transport unit that intermittently transports the flat conductor drawn from the nozzle unit, and a control unit that synchronously controls the supply of molten resin by the nozzle unit and the transport of the flat conductor by the transport unit. The resin coating apparatus according to claim 1, wherein the apparatus is a resin coating apparatus.   The resin coating apparatus according to claim 1, wherein the flat conductor is a collective conductor. A nozzle having a flat opening through which a flat conductor is inserted into a conical tip, a die provided with a conical hole corresponding to the shape of the tip of the nozzle, and the nozzle being held rotatably and axially movable Nozzle holding means, die holding means for rotatably holding the die, guide means guided by the flat surface of the rectangular conductor, and rotating the nozzle so as to follow the twist of the rectangular conductor; and the nozzle; Using a resin coating apparatus provided with a nozzle unit including a connecting means for connecting to the die so as to be integrally rotatable,
In the state where the nozzle and the die are integrally rotated so as to follow the twist of the rectangular conductor that is inserted through the nozzle and conveyed by the nozzle unit, the tip of the nozzle and the cone of the die A resin coating method comprising supplying molten resin around the rectangular conductor through a gap between the holes.