JP2010041866A - Apparatus and method for manufacturing electric cord - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric cord manufacturing apparatus and an electric cord manufacturing method, for manufacturing an electric cord whose insulating sheath is removed properly to ensure satisfactory electric connection. <P>SOLUTION: The manufacturing apparatus is used for manufacturing an electric cord 50 whose core wire 51 is sheathed and which has a connection portion for electric connection that is formed in the middle by exposing the core wire 51. The manufacturing apparatus includes: an upper heater 21 and a lower heater 41 arranged opposite to each other across the electric cord 50, a pressure cylinder 30 which moves toward the heaters 21 and 41 to cause the heaters 21 and 41 to apply a pressure to the electric cord 50, temperature control units 22 and 42 which control the temperatures of the heaters 21 and 41 that melt a part of the insulating sheath 52, a drive control unit 32 which controls the pressure applied by the heaters 21 and 41 to the electric cord 50, and a pressure application time control unit 33 which controls time for applying pressure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrical cord manufacturing apparatus and a manufacturing method in which a connecting portion for electrical connection is provided in the middle.

  As an electrical cord with a connection part that performs electrical connection in the middle, the part of the insulation coating is peeled off and removed in the middle of the electrical cord to expose the core wire, and the exposed portion of the core wire is used as the connection portion There is. When connecting an electrical device with the electrical cord, the connecting portion where the core wire is exposed is electrically connected to the core wire connection position of the electrical device, and unnecessary portions of the core wire connected to the electrical device are cut and removed. (See Patent Document 1).

Japanese Patent Publication No. 6-65079

  By the way, when the insulation coating of the electrical cord is peeled off at the site where the electrical cord is connected as in Patent Document 1, for example, the insulation coating is peeled off by forming a cut with a blade in the insulation coating. In addition, there is a situation in which the insulation coating remains in an unintended portion where the cut is not sufficiently formed, or the cut is deeply formed and the core wire is damaged. If the insulation coating remains on the unintended part or the core wire is damaged, there is a possibility that the electrical connection with the electric cord becomes insufficient in electrical connection or breaks. For this reason, an electric cord that can be appropriately removed to provide a good electrical connection is desired.

  The present invention is proposed in view of the above problems, and provides an electrical cord manufacturing apparatus and a manufacturing method capable of obtaining an electrical cord capable of ensuring a good electrical connection after appropriate insulation coating is removed. The purpose is to do.

  An electrical cord manufacturing apparatus according to the present invention is an electrical cord manufacturing apparatus in which a core wire is insulated and a connecting portion for electrical connection is provided in the middle of the core wire so as to be exposed. A heater arranged oppositely across the electric cord, and an advance / retreat mechanism for moving at least one heater of the oppositely arranged heater to the other heater side so as to apply pressure to the electric cord with the oppositely arranged heater A temperature control unit that controls the temperature of the opposed heater that melts a part of the insulation coating with the pressure load, and a drive control unit that controls the pressure applied to the electric cord by the opposed heater. And a pressure load time control unit for controlling a time during which pressure is applied to the electric cord by the opposed heater.

  In the electrical cord manufacturing apparatus of the present invention, the one heater and the other heater arranged opposite to each other may be a pair of heaters, and the pair of heaters may provide a region corresponding to a region near both ends of the connection portion. The insulating coating is melted.

  In the electrical cord manufacturing apparatus of the present invention, when the insulating coating material of the electrical cord is a thermoplastic elastomer (TPE) and has a thickness of 0.6 to 1.0 mm, the heater temperature is set to 270. The pressure applied by the heater is 0.1 Pa to 0.2 Pa, and the pressure loading time during which the pressure is applied by the heater is 2.0 seconds to 2.5 seconds.

  The electric cord manufacturing apparatus according to the present invention is characterized in that a surface of the heater for applying pressure to the electric cord has a shape extending in a V shape or a U shape in the longitudinal direction of the electric cord.

  The electrical cord manufacturing method of the present invention is a manufacturing method of an electrical cord in which a core wire is insulated and a connecting portion for electrical connection is provided in the middle of the core wire so as to be exposed. The heater is set to a predetermined temperature, and a first step of placing an electrical cord with insulation coating between the opposed heaters, and at least one heater of the opposed heaters is moved to the other heater side, A second step of applying a predetermined pressure to the electric cord with the opposedly arranged heater and melting a part of the insulation coating of the electric cord; and after applying the predetermined pressure for a predetermined time, at least one of the heaters And a third step of retreating away from the other heater side.

  Also, in the electrical cord manufacturing method of the present invention, the one heater and the other heater in the opposed arrangement are each a pair of heaters, and in the second step, by the pair of heaters, in the vicinity of both ends of the connecting portion. The insulating coating in a region corresponding to the region is melted, and after the third step, a fourth step of stripping the insulating coating between the melted regions is performed.

  The electric cord manufacturing apparatus or electric cord manufacturing method of the present invention melts by applying pressure to a part of the insulation coating of the electric cord with a heater arranged oppositely, and at that time, the temperature, pressure, and pressure of the heater are loaded. It is possible to remove the appropriate insulating coating by controlling the time to be performed to a predetermined value. In other words, the insulation coating remains in an unintended part due to insufficient melting of the insulation coating, or the insulation coating is melted too much, for example, a plurality of core wires are provided in the insulation coating, and the plurality of core wires are enameled. It is possible to prevent a situation where the inner insulation coating melts and the core wires are short-circuited when insulated by a high quality inner insulation coating, and an electric cord capable of ensuring a good electrical connection can be obtained. it can.

  Also, one heater and the other heater arranged opposite to each other form a pair of heaters, and the pair of heaters melt the insulating coating in the region corresponding to the region near both ends of the connection portion, so that the connection portion is finally obtained. An exposed portion of the insulation coating having a length to be used can be directly formed on the electric cord, so that a necessary connection region can be ensured. In addition, when the insulation coating material is highly stretchable, it is possible to form a melted part in one place, and to secure the region of the connection part by bringing the insulation coating on both sides or one side of the melted part closer together. When the stretchability of the covering material is low, it is difficult to secure such a connection area, but the insulation covering material stretches in the area corresponding to the area near both ends of the connecting area. Even when the property is low, it is possible to ensure the area of the connection portion.

  Further, when the insulation material of the electrical cord is a thermoplastic elastomer (TPE) having a thickness of 0.6 to 1.0 mm, the heater temperature is 270 ° C. to 300 ° C., and the pressure applied by the heater is 0. By removing the appropriate insulation coating of the electric cord having the material of the insulation coating as TPE by setting the pressure load time for applying the pressure with the heater to 2.0 to 2.5 seconds by 1 Pa to 0.2 Pa, An optimum connection portion can be formed.

  In addition, the surface of the heater that applies pressure to the electric cord has a shape extending in a V shape or U shape in the longitudinal direction of the electric cord, so that the pressure and temperature are substantially uniformly distributed over the entire circumference of the insulating coating of the electric cord. Can be applied, and local bias of applied pressure and temperature can be prevented.

  An electrical cord manufacturing apparatus and method according to an embodiment of the present invention will be described with reference to the drawings.

[Electric Cord Manufacturing Apparatus and Manufacturing Method of First Embodiment]
The electric cord manufacturing apparatus according to the first embodiment is an apparatus 10 for manufacturing an electric cord 50 in which a core wire 51 is covered with an insulating coating 52 and a connecting portion for electrical connection is provided in the middle of the core wire being exposed. As shown in FIGS. 1 and 2, the upper and lower heaters 21 and 41 are arranged opposite to each other with the electric cord 50 interposed therebetween, and the electric cord 50 is loaded with pressure by the upper and lower heaters 21 and 41. And a pressure cylinder 30 corresponding to an advance / retreat mechanism for moving the upper heater 21 toward the lower heater 41 side.

  The upper heater 21 is provided in a pair in a region corresponding to a region near both ends of the connecting portion where the core wire 51 is exposed from the insulating coating 52 of the electric cord 50. The upper heater 21 is formed in a substantially rectangular plate shape, is attached so that one side surface is inserted into the lower end portion of the upper jig 20, and is disposed with the side surface opposite to the one side surface facing downward. . The lower side surface directed downward of the upper heater 21 becomes a pressing surface 211 that applies pressure to the electric cord 50, and the pressing surface 211 extends in the longitudinal direction of the electric cord 50 in a V shape or a U shape as shown in FIG. 3. It is formed in a shape. The upper heater 21 is connected to an upper heater temperature control unit 22 that controls the temperature of the upper heater 21, and the upper heater temperature control unit 22 stores the set predetermined temperature in the storage unit and sets the set predetermined temperature. A current is passed through the upper heater 21 to raise the temperature so as to reach a temperature, and a predetermined temperature state is maintained.

  The upper jig 20 is fixedly attached to the lower end of the cylinder rod 31 of the pressure cylinder 30, and the upper jig 20 and the upper heater 21 are lowered and raised as the cylinder rod 31 expands and contracts. The pressure cylinder 30 is appropriate such as an air cylinder or a hydraulic cylinder. The pressure cylinder 30 is connected to a drive control unit 32, and the cylinder rod 31 is expanded and contracted by the drive control of the drive control unit 32 so that the upper heater 21 is lowered and raised.

  The drive control unit 32 includes a pressure gauge, a pressure adjustment unit that adjusts the pressure of the pressure cylinder 30, and a storage unit that stores a predetermined pressure that is set, and lowers and sets the upper jig 20 and the upper heater 21. The pressure in the pressure cylinder 30 is measured with a pressure gauge so that the predetermined pressure is set, and the pressure for lowering the upper jig 20 and the upper heater 21 or the pressure for pressing the electric cord 50 is set. Adjust so that

  The drive control unit 32 is connected to the pressure load time control unit 33. The pressure load time control unit 33 has a timer and a storage unit that stores a predetermined time for loading the set pressure, and when the pressure of the pressure gauge of the drive control unit 32 becomes the set predetermined pressure The predetermined time set to the time is measured by a timer, and when the predetermined time is reached, a signal reaching the predetermined time is transmitted to the drive control unit 32, and the drive control unit 32 contracts the cylinder rod 31 in response to the signal. The upper heater 21 is raised.

  The lower heater 41 is provided in a pair in a region corresponding to a region in the vicinity of both ends of the connecting portion where the core wire 51 is exposed from the insulating coating 52 of the electric cord 50. The lower heater 41 is formed in a substantially rectangular plate shape, and is attached so that one side surface is inserted into the upper end portion of the lower jig 40 on the support base 43, and the side surface opposite to the one side surface is directed upward. It is arranged. The upper side surface directed upward of the lower heater 41 is a pressing surface 411 that applies pressure to the electric cord 50, and as shown in FIG. 3, the pressing surface 411 extends in a V shape or U shape in the longitudinal direction of the electric cord 50. And provided at positions corresponding to the pressing surface 211 of the upper heater 21. The lower heater 41 is connected to a lower heater temperature control unit 42 that controls the temperature of the lower heater 41, and the lower heater temperature control unit 42 stores a set predetermined temperature in a storage unit and sets a set predetermined temperature. A current is passed through the lower heater 41 to raise the temperature so as to reach a temperature, and a predetermined temperature state is maintained.

  When manufacturing the electric cord 50 in which the core wire 51 is exposed in the middle by the electric cord manufacturing apparatus 10 of the first embodiment, the upper heater 21 and the lower heater 41 and the lower heater 41 are set to a predetermined temperature. An electric cord 50 provided with an insulating coating 52 is disposed between the heater 41 and the heater 41. Thereafter, the cylinder rod 31 of the pressure cylinder 30 is extended by the drive control unit 32, the upper jig 30 and the upper heater 31 are moved downward, and the electric cord 50 is connected by the pair of upper heaters 31 and the pair of lower heaters 32. A predetermined pressure is applied to the electric cord 50 so as to be sandwiched, and a predetermined pressure is applied for a predetermined time to melt the insulating coating 52 in a region corresponding to a region near both ends of the connecting portion of the electric cord 50.

  In response to the recognition of the passage of the predetermined time by the pressure load time control unit 33, the drive control unit 32 contracts the cylinder rod 31 and moves the upper heater 21 backward from the lower heater 41 side. Thereafter, the insulation coating 52 between the melted regions is peeled off to expose the core wire 51 to form a connection portion. In addition, when the material of the insulating coating 52 of the electric cord 50 is a thermoplastic elastomer (TPE) and has a thickness of 0.6 to 1.0 mm, the predetermined temperature of the upper heater 21 and the lower heater 41 is set to 270 ° C. to 300 ° C. The predetermined pressure to be loaded is preferably 0.1 Pa to 0.2 Pa, and the predetermined pressure load time to load the pressure is preferably 2.0 seconds to 2.5 seconds.

  By using the electrical cord manufacturing apparatus or the manufacturing method of the first embodiment, it is possible to remove the appropriate insulating coating 52 and obtain the electrical cord 50 that can ensure good electrical connection. In addition, the insulating coating exposed portion having a length finally used as a connection portion can be directly formed on the electric cord, so that a necessary connection region can be ensured. Further, even when the stretchability of the material of the insulating coating 52 is low, the region of the connection portion can be ensured reliably. Moreover, the surface which applies a pressure to the electric cord 50 of the heaters 21 and 41 is formed in a V-shaped or U-shaped cross-sectional view extending in the longitudinal direction of the electric cord 50, so that the entire circumference of the insulating coating of the electric cord is extended. Pressure and temperature can be applied substantially uniformly, and local bias of applied pressure and temperature can be prevented.

[Electric Cord Manufacturing Apparatus and Manufacturing Method of Second Embodiment]
In the electric cord manufacturing apparatus according to the second embodiment, as shown in FIG. 4, one upper heater 21 a is provided at the approximate center of the upper jig 20, and corresponds to the upper heater 21 a at the approximate center of the lower jig 40. One lower heater 41a is provided at the position, and other configurations are the same as those of the first embodiment. When the electric cord 50 is manufactured by the electric cord manufacturing apparatus according to the second embodiment, a part of the region where the connection portion of the electric cord 50 is to be formed, for example, the approximate center of the region where the connection portion is to be formed. A region is sandwiched between the upper heater 21a and the lower heater 41a, and a predetermined pressure is applied for a predetermined time to melt the region. Thereafter, the upper heater 21a is retracted away from the lower heater 41a side, and the insulation coating 52 between the melted regions is brought to both sides or one side to expose the core wire 51, thereby forming a connection portion. Other configurations are the same as those of the first embodiment.

  By using the electrical cord manufacturing apparatus or the manufacturing method of the second embodiment, it is possible to remove the appropriate insulating coating 52, and it is possible to obtain the electrical cord 50 that can ensure good electrical connection. Moreover, when the stretchability of the material of the insulating coating 52 is high, the area of the connecting portion can be secured more easily. Moreover, the surface which applies a pressure to the electric cord 50 of the heaters 21a and 41a is formed in a V-shaped or U-shaped cross-sectional view extending in the longitudinal direction of the electric cord 50, so that the entire circumference of the insulating coating of the electric cord is extended. Pressure and temperature can be applied substantially uniformly, and local bias of applied pressure and temperature can be prevented.

  In addition to the configurations of the inventions and embodiments, the invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification, to the extent applicable. Or those specified by adding other configurations disclosed in the present specification to these configurations, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained, Is also included.

  INDUSTRIAL APPLICABILITY The present invention can be used for manufacturing an electric cord in which a connecting portion that is electrically connected is provided in the middle.

Front explanatory drawing which shows the manufacturing apparatus of the electrical cord of 1st Embodiment. The partial front view which shows the state which pressed the electrical cord with the upper heater and the lower heater in the manufacturing apparatus of the electrical cord of FIG. (A) And (b) is a longitudinal cross-sectional view which shows the electric cord currently pressed by the upper heater and the lower heater. Front explanatory drawing which shows the manufacturing apparatus of the electric cord of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric cord manufacturing apparatus 20 ... Upper jig 21, 21a ... Upper heater 211 ... Pressing surface 22 ... Upper heater temperature control part 30 ... Pressure cylinder 31 ... Cylinder rod 32 ... Drive control part 33 ... Pressure load time control part 40 ... Lower jig 41, 41a ... Lower heater 411 ... Pressing surface 42 ... Lower heater temperature control unit 43 ... Support base 50 ... Electric cord 51 ... Core wire 52 ... Insulation coating

Claims (6)

An electrical cord manufacturing apparatus in which a core wire is insulated and a connection portion for electrical connection is provided in the middle while exposing the core wire,
A heater disposed oppositely across the insulating coated electrical cord disposed;
An advancing / retreating mechanism for moving at least one heater of the opposed arrangement heater to the other heater side so as to apply pressure to the electric cord with the opposed arrangement heater;
A temperature control unit for controlling the temperature of the opposed heater that melts a part of the insulating coating with the pressure load;
A drive control unit for controlling the pressure applied to the electric cord by the opposed heater;
An electrical cord manufacturing apparatus comprising: a pressure load time control unit configured to control a time during which pressure is applied to the electrical cord by the opposed heater. The one heater and the other heater in the opposite arrangement are each a pair of heaters,
The electrical cord manufacturing apparatus according to claim 1, wherein the insulating coating in a region corresponding to a region near both ends of the connection portion is melted by the pair of heaters. When the material of the insulating coating of the electrical cord is a thermoplastic elastomer and has a thickness of 0.6 to 1.0 mm,
The heater temperature is set to 270 ° C. to 300 ° C.,
The pressure applied by the heater is 0.1 Pa to 0.2 Pa,
3. The electric cord manufacturing apparatus according to claim 1, wherein a pressure load time for applying pressure by the heater is 2.0 seconds to 2.5 seconds.   The electric cord manufacturing method according to any one of claims 1 to 3, wherein a surface of the heater for applying a pressure to the electric cord has a shape extending in a V shape or a U shape in a longitudinal direction of the electric cord. apparatus. A method of manufacturing an electrical cord in which a core wire is insulated and a connection portion for electrical connection is provided in the middle of the core wire exposing the core wire,
A first step of setting a heater disposed opposite to a predetermined temperature, and disposing an electric cord covered with insulation between the heaters disposed opposite to each other;
Secondly, at least one heater of the opposed heater is moved to the other heater side, a predetermined pressure is applied to the electric cord by the opposed heater, and a part of the insulation coating of the electric cord is melted. Process,
And a third step of retracting at least one of the heaters away from the other heater side after the predetermined pressure is applied for a predetermined time. The one heater and the other heater in the opposite arrangement are each a pair of heaters,
In the second step, the insulating coating in a region corresponding to a region near both ends of the connection portion is melted by the pair of heaters,
After the third step, a fourth step of stripping the insulating coating between the melted regions is performed.

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