JP2017079165A - Method of manufacturing electric wire with heat shrinkable tube and heat shrinkable tube mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of more surely inhibiting an adhesive provided between a heat shrinkable tube and an electric wire with a terminal from flowing out up to a mating connection side of the terminal.SOLUTION: A method of manufacturing an electric wire 10 with a heat shrinkable tube includes steps shown below. A first step (a) is a step for covering the heat shrinkable tube 28 on an electric wire 11 with a terminal and arranging and installing an adhesive in the heat shrinkable tube 28. A second step (b) is a step for squeezing the heat shrinkable tube 28 from the front end to the rear end by an abutting member which abuts on the outer surface of the heat shrinkable tube 28 and moves while thermally contracting the heat shrinkable tube 28.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technique for attaching a heat-shrinkable tube to a connection portion between an electric wire and a terminal.

  A heat-shrinkable tube may be attached to an electric wire with a terminal for the purpose of water stop or corrosion prevention. At this time, Patent Document 1 discloses a technique for suppressing the adhesive provided between the heat-shrinkable tube and the terminal-attached electric wire from flowing out to the mating connection portion of the terminal.

  The jig for assembling the heat-shrinkable tube described in Patent Document 1 has the damming wall portion with which one end of the tube of the heat-shrinkable tube is brought into contact, so that the adhesive leaks to the mating connection portion of the terminal. It is said that there is no.

JP 2013-114936 A

  However, in the invention described in Patent Document 1, the jig is provided with a wall for stopping the adhesive, and when the amount of the adhesive is large, the adhesive passes through the wall and the other side connection portion of the terminal. There was a risk of flowing to the side.

  Then, this invention provides the technique which can suppress more reliably that the adhesive agent provided between the heat contraction tube and the electric wire with a terminal flows out to the other party connection part side of a terminal. Objective.

  In order to solve the above-described problem, a method of manufacturing an electric wire with a heat-shrinkable tube according to a first aspect includes: (a) a step of covering the heat-shrinkable tube with an electric wire with a terminal and disposing an adhesive in the heat-shrinkable tube; And (b) squeezing the heat-shrinkable tube from the front end toward the rear end by a contact member that moves against the outer surface of the heat-shrinkable tube while shrinking the heat-shrinkable tube.

  The method for manufacturing the electric wire with heat-shrinkable tube according to the second aspect is the method for manufacturing the electric wire with heat-shrinkable tube according to the first aspect, wherein the abutting member has a direction perpendicular to the moving direction as the axial direction. And a roller supported so as to be rotatable at least in a direction corresponding to a moving direction around the axis, and the roller hits while rotating from the front end to the rear end of the heat shrinkable tube.

  The manufacturing method of the electric wire with a heat contraction tube which concerns on a 3rd aspect is a manufacturing method of the electric wire with a heat contraction tube which concerns on the 1st or 2nd aspect, Comprising: The said contact member is with respect to the said heat contraction tube. Contact from all sides.

  The manufacturing method of the electric wire with a heat-shrinkable tube which concerns on a 4th aspect is a manufacturing method of the electric wire with a heat-shrinkable tube which concerns on any one 1st-3rd aspect, Comprising: The said heat | fever via the said contact member Heat the shrink tube.

  A method for manufacturing an electric wire with a heat-shrinkable tube according to a fifth aspect is a method for manufacturing an electric wire with a heat-shrinkable tube according to any one of the first to fourth aspects, wherein the contact member is moved. The contact form is deformed according to the outer shape of the electric wire with terminal.

  The method for manufacturing an electric wire with a heat-shrinkable tube according to a sixth aspect is a method for manufacturing an electric wire with a heat-shrinkable tube according to any one of the first to fifth aspects, and when the heat-shrinkable tube is squeezed, A step of pressing a rear end edge portion of the heat shrinkable tube.

  The heat-shrinkable tube mounting device according to a seventh aspect includes a heating mechanism provided to heat the heat-shrinkable tube in a state where the heat-shrinkable tube before shrinkage is covered with the electric wire with terminal, and the heat-shrinkable tube includes A throttle mechanism including an abutting member that moves from the front end side toward the rear end side with respect to the heat shrinkable tube while hitting the heat shrinkable tube during the heat shrinkage.

  According to the first to sixth aspects, (a) covering the heat-shrinkable tube with the terminal-attached electric wire and disposing an adhesive in the heat-shrinkable tube; and (b) heat shrinking the heat-shrinkable tube while And a step of squeezing the heat-shrinkable tube from the front end toward the rear end by the contact member that moves against the outer surface of the shrinkable tube, so that an excess amount of the adhesive hardly flows out from the front-end opening of the heat-shrinkable tube. Thereby, it can suppress more reliably that the adhesive agent provided between the heat contraction tube and the electric wire with a terminal flows out to the other party connection part side of a terminal.

  In particular, according to the second aspect, the abutting member includes a roller that is supported so as to be rotatable in a direction corresponding to at least the moving direction around the axis, with the direction orthogonal to the moving direction as the axial direction. , While being rotated while rotating from the front end to the rear end of the heat-shrinkable tube, it is difficult to apply an extra force when the contact member moves along the outer surface of the heat-shrinkable tube.

  In particular, according to the third aspect, the abutting member abuts against the heat-shrinkable tube from four directions, so that the entire periphery of the tube can be more reliably squeezed.

  In particular, according to the fourth aspect, the heat-shrinkable tube is heated via the contact member, so that the portion of the heat-shrinkable tube that is in contact with the contact member can be thermally contracted first. At this time, since the heat-shrinkable tube is squeezed from the front end toward the rear end, the front end side of the heat-shrinkable tube can be heat-shrinked first. For this reason, it is possible to create a situation in which the heat shrinkage of the heat shrinkable tube to which the contact member is moved is not completed, and the gap between the inner surface side of the heat shrinkable tube to which the contact member is moved and the electric wire with terminal. However, since the contact member becomes larger than the portion after the movement, the excess amount of the adhesive moves more reliably to the rear end side of the heat-shrinkable tube. This makes it difficult for the adhesive to flow out of the opening on the front end side of the heat shrinkable tube.

  In particular, according to the fifth aspect, the contact member is deformed in accordance with the outer shape of the terminal-attached electric wire during movement, so that it is possible to prevent the adhesive from being squeezed too much or the adhesive squeezing is insufficient. can do.

  In particular, according to the sixth aspect, when the heat-shrinkable tube is squeezed, it includes a step of pressing the rear end edge portion of the heat-shrinkable tube, so that the heat-shrinkable tube is heat-shrinked when squeezed from the front end side toward the rear end side. It can suppress that a tube shifts to the other end part side on the opposite side to the side in which the said heat contraction tube is provided with respect to the electric wire with a terminal.

  According to the seventh aspect, in a state where the heat-shrinkable tube before shrinkage is covered with the electric wire with terminal, the heating mechanism provided so that the heat-shrinkable tube can be heated, and the heat-shrinkable tube is in the middle of heat shrinking And a throttle mechanism that includes a contact member that moves from the front end side toward the rear end side with respect to the heat shrinkable tube while hitting the heat shrinkable tube. It is squeezed toward the rear end side. For this reason, the excess part of the adhesive moves to the rear end side of the heat-shrinkable tube and hardly flows out from the front end opening. Thereby, it can suppress more reliably that the adhesive agent provided between the heat contraction tube and the electric wire with a terminal flows out to the other party connection part side of a terminal.

It is a schematic sectional drawing which shows an electric wire with a heat contraction tube. It is explanatory drawing which shows a heat contraction tube attachment apparatus. It is explanatory drawing which shows a heat contraction tube attachment apparatus. It is explanatory drawing which shows one manufacturing process of an electric wire with a heat contraction tube. It is explanatory drawing which shows one manufacturing process of an electric wire with a heat contraction tube. It is explanatory drawing which shows the modification of an abutting member. It is explanatory drawing which shows the modification of an abutting member.

{Embodiment}
Hereinafter, the manufacturing method of the electric wire with a heat contraction tube which concerns on embodiment is demonstrated. For convenience of explanation, after first describing the heat-shrinkable tube-attached electric wire to be produced and the heat-shrinkable tube mounting device for producing the same, a method for producing the heat-shrinkable tube-attached electric wire will be explained.

<Electric wire with heat shrinkable tube>
First, the electric wire 10 with a heat-shrinkable tube will be described with reference to FIG. Drawing 1 is an outline sectional view showing electric wire 10 with a heat contraction tube concerning an embodiment.

  The heat-shrinkable tube-equipped electric wire 10 includes an electric wire 13, a terminal 18, and a heat-shrinkable tube 28. Specifically, the heat-shrinkable tube 28 is attached to the electric wire with terminal 11 in which the terminal 18 is attached to the electric wire 13 to form the electric wire 10 with heat-shrinkable tube.

  The electric wire 13 includes a core wire portion 14 and a covering portion 16 formed around the core wire portion 14. The core wire portion 14 is formed in a linear shape from a conductive material such as copper, copper alloy, aluminum, or aluminum alloy. Here, the core wire portion 14 has a configuration in which a plurality of strands are twisted together. But the core wire part may be comprised by the single wire. The covering portion 16 is formed by extruding the insulating resin material around the core wire portion 14 by an extrusion device or the like. The core wire portion 14 is exposed at the distal end portion of the electric wire 13, and an exposed core wire portion 14a having a predetermined length is formed.

  The terminal 18 is a member formed by, for example, pressing a plate material formed of copper or a copper alloy. The surface of the terminal 18 may be tin-plated or the like. Here, a ground terminal is assumed as the terminal 18.

  The terminal 18 includes a counterpart connection part 20, a wire connection part 22, and a connection part 26. The mating side connection part 20 and the wire connection part 22 are connected in a straight line via the connection part 26.

  The counterpart connection part 20 is formed in a plate shape. The counterpart connection part 20 is formed in, for example, an elliptical plate shape, a circular plate shape, or a square plate shape. A hole 20 h is formed in the mating connection portion 20. Bolts 32 are inserted into the holes 20h. Although the hole 20h is described as being formed in a circular shape, it is not always necessary.

  The electric wire connecting portion 22 includes a core wire crimping portion 23 and a covering crimping portion 24. A coated crimping portion 24 is formed on the opposite side of the core wire crimping portion 23 from the counterpart connection portion 20. The core wire crimping part 23 has a configuration in which a pair of crimping pieces 23b are extended and formed on both sides of the bottom part 23a. Then, the pair of crimping pieces 23b are caulked to the exposed core part 14a in a state where the exposed core part 14a is disposed on the bottom 23a. Further, the cover crimping portion 24 is configured such that a pair of crimping pieces 24b are extended and formed on both side portions of the bottom portion 24a. The bottom 24a is continuous with the bottom 23a. The pair of crimping pieces 24 b are caulked to the covering portion 16 in a state where the end portion of the covering portion 16 is disposed on the bottom portion 24 a. Thereby, the end portion of the electric wire 13 is connected to the electric wire connecting portion 22 of the terminal 18. Here, the bottom 24a of the cover crimping portion protrudes outside the bottom 23a of the core crimping portion, but this is not always necessary.

  Note that the coated crimping portion 24 may be omitted. Further, the exposed core wire portion 14a may be connected to the electric wire connecting portion by ultrasonic welding, resistance welding, soldering, or the like.

  The connecting portion 26 is formed in a plate shape, and connects the counterpart connection portion 20 and the bottom portion 23 a of the wire connection portion 22. The counterpart connection part 20 and the coupling part 26 extend in the same plane.

  The heat shrinkable tube 28 is a member that covers the connection portion 12 between the terminal 18 and the electric wire 13. Here, a heat-shrinkable tube 28B before heat shrinkage (hereinafter, the symbol attached after the name is distinguished from the heat-shrinkable tube 28B before heat-shrink and the heat-shrinkable tube 28 after heat-shrinkage) covers the connecting portion 12. The heat shrinkable tube 28 is formed by heat shrinking in the above state. The heat-shrinkable tube 28B is obtained by cooling a resin member formed into a tubular shape by extrusion molding after being stretched into a thick tubular shape after being subjected to a crosslinking treatment. The heat-shrinkable tube 28B thus obtained has a shape memory characteristic that, when heated, shrinks to a thin tubular shape before being stretched.

  The heat-shrinkable tube 28 is heat-shrinked in a shape corresponding to the outer shape of the connection portion 12 and is in close contact with the surface of the connection portion 12 as much as possible. A hot melt 29 is provided as an adhesive inside the heat shrinkable tube 28B. For example, the hot melt 29 is formed on the entire inner peripheral surface of the heat shrinkable tube 28B. When the heat-shrinkable tube 28B is thermally shrunk, the hot melt 29 is softened or melted to fill the gap between the surface of the connecting portion 12 and the inner surface of the heat-shrinkable tube 28 as much as possible. When the heat shrinkable tube 28 </ b> B is thermally shrunk, an excessive amount of hot melt 29 that does not fit in the gap may protrude from the end of the heat shrinkable tube 28. Here, the excess hot melt 29 protrudes outward from the end portion of the heat shrinkable tube 28 on the covering portion 16 side. Further, at the end of the heat shrinkable tube 28 on the counterpart connection part 20 side, the heat shrink 29 is suppressed by using a heat shrinkable tube mounting device 40 which will be described later, thereby preventing the hot melt 29 from protruding.

  As the adhesive, in addition to the hot melt 29, a thermosetting adhesive, a moisture curable adhesive, or the like may be used. In these cases, an adhesive may be applied to the connection portion 12 in advance.

  The terminal 18 is connected to the part 30 to be connected as follows. That is, the bolt 32 is erected on the part 30 to be connected (for example, the ground connection part 30). The peripheral portion of the portion where the bolt 32 is erected in the ground connection portion 30 is formed in a conductive portion by metal or the like. And the other party connection part 20 is arrange | positioned on the earth connection site | part 30 so that the volt | bolt 32 may be penetrated to the hole 20h. Thereafter, the nut 34 is fastened to the bolt 32, and the counterpart connection portion 20 is sandwiched between the ground connection portion 30 and the nut 34. As a result, the counterpart connection portion 20 is fixed in a fixed posture with respect to the ground connection portion 30, and the counterpart connection portion 20 comes into contact with the ground connection portion 30, the bolt 32, and the nut 34. It is electrically connected to the connection site 30.

  Since the terminal 18 contacts the ground connection part 30 and the nut 34 and is electrically connected to the ground connection part 30 as described above, the hot melt 29 is attached to the surface of the mating connection part 20. Then, the electrical connection between the mating connector 20 and the ground connection part 30 or the nut 34 becomes unstable.

  The heat shrinkable tube mounting device 40 to be described next more reliably ensures that when the heat shrinkable tube 28B is heat shrunk around the terminal-attached electric wire 11, the hot melt 29 therein flows into the mating connecting portion 20 side. It is an apparatus for suppressing.

<About heat shrinkable tube mounting device>
2 and 3 are explanatory views showing the heat-shrinkable tube mounting device 40. FIG. 2 is an explanatory view showing a state in which the work W is set on the heat shrinkable tube mounting device 40, and FIG. 3 is an explanatory view showing a state in which the roller 62 is in contact with the work W. Moreover, FIG. 2 is the figure seen from the side with respect to the electric wire 11 with a terminal, and FIG. 3 is the figure seen from the front end side of the terminal 18 with respect to the electric wire 11 with a terminal. In the following, for the sake of convenience, the extending direction of the terminals in FIGS. 2 and 3 may be referred to as the x-axis direction, the width direction of the terminals may be referred to as the y-axis direction, and the x-axis direction and the direction orthogonal to the y-axis direction may be referred to as the z-axis direction. is there. In FIG. 3, the moving mechanism 70 is depicted in a simplified manner (the same applies to FIGS. 6 and 7 described later).

  The heat-shrinkable tube mounting device 40 includes a base body 50, a throttle mechanism 60, and a heating mechanism 80.

  The base body 50 is formed so as to be able to set a work W in which the heat-shrinkable tube 28 </ b> B before contraction is covered on the terminal-attached electric wire 11. Here, the base body 50 includes a terminal positioning portion and a tube positioning portion. The terminal positioning part and the tube positioning part are connected to the frame 51.

  The terminal positioning part is a part that suppresses the displacement of the terminal 18 when the workpiece W is set. Here, the terminal positioning part includes a terminal support part 52 and a positioning pin 54.

  The terminal support 52 is provided so as to support the terminal 18. Here, the terminal support portion 52 is provided so as to support the bottom surface of the terminal 18. Further, the terminal support portion 52 is connected to the frame 51.

  The positioning pin 54 protrudes from the terminal support portion 52. The positioning pin 54 is formed at a position corresponding to the hole 20h of the mating connector 20 when the workpiece W is set. Then, the terminal 18 is positioned with respect to the base body 50 by inserting the positioning pin 54 into the hole 20h.

  The tube positioning portion is a portion that suppresses the displacement of the heat shrinkable tube 28B when the workpiece W is set. Here, the tube positioning portion includes a pressing portion 56 that presses the rear end edge portion of the heat-shrinkable tube 28. The pressing portion 56 is provided at a position where the rear end portion of the heat shrinkable tube 28B can be pressed when the workpiece W is set. Then, the pressing portion 56 presses the rear end portion of the heat shrinkable tube 28 </ b> B, so that the heat shrinkable tube 28 </ b> B is positioned with respect to the base body 50. Here, the presser portion 56 is connected to the frame 51.

  The pressing portion 56 can press the rear end edge portion of the heat-shrinkable tube 28B even when the heat-shrinkable tube 28B is squeezed from the front end toward the rear end. Accordingly, when the heat shrinkable tube 28B is squeezed from the front end side toward the rear end side, the heat shrinkable tube 28B is opposite to the side on which the heat shrinkable tube 28B is provided with respect to the terminal-attached electric wire 11 side. It is possible to suppress the positional deviation.

  Since the presser part 56 presses the rear end edge of the heat shrinkable tube 28B when the heat shrinkable tube 28B is heat shrunk, the hot melt 29 that is softened and flows out from the rear end of the heat shrinkable tube 28B is pressed. It is considered that the portion 56 abuts. Therefore, it is preferable that the presser part 56 is formed of a material to which the hot melt 29 is difficult to stick. For example, it is preferably formed of a resin such as Teflon (registered trademark). Further, only the surface of the presser portion 56 that faces the heat-shrinkable tube 28B and the terminal-attached electric wire 11 may be formed of a resin such as Teflon (registered trademark). Further, it is preferable that the entire pressing portion 56 is formed of a material that can withstand the temperature when the heat shrinkable tube 28B is heat shrunk. Teflon (registered trademark) resin satisfies this requirement.

  The presser part 56 may be in contact with the covering part 16 or may not be in contact. When the presser portion 56 is in contact with the covering portion 16 over the entire circumference, the hot melt 29 can be prevented from flowing out from the rear end of the heat shrinkable tube 28.

  However, when the amount of the hot melt 29 is large, the hot melt 29 may escape from the rear end of the heat shrinkable tube 28B in order to prevent the rear end of the heat shrinkable tube 28B from swelling too much. In this case, by providing the presser part 56 so that the presser part 56 is not in contact with the covering part 16, the presser part 56 can escape the hot melt 29 that is about to flow out from the rear end of the heat shrinkable tube 28 </ b> B. It becomes. However, even when the presser portion 56 is in contact with the covering portion 16, the presser portion 56 can escape the hot melt 29 that tends to flow out from the rear end of the heat shrinkable tube 28 </ b> B if the following configuration is adopted. It becomes possible. That is, it is conceivable that the presser part 56 is provided so as to contact only a part of the covering part 16 in the circumferential direction, or that the heat-shrinkable tube 28B is provided so that it can be retracted to a certain degree after being thermally contracted to some extent.

  In order to suppress hot melt 29 from accumulating too much at the rear end of heat shrink tube 28 or to prevent hot melt 29 from flowing out from the rear end of heat shrink tube 28, heat shrink tube 28 is heated. It is preferable to control heating conditions such as temperature and heating time, and drawing conditions such as the position and speed of rollers, which will be described later.

  Further, when the presser portion 56 is in contact with the covering portion 16, the presser portion 56 may be configured to sandwich the cover portion 16. When the pressing portion 56 holds the covering portion 16, the electric wire 13 is positioned with respect to the base body 50 by the pressing portion 56.

  However, the shape of the terminal positioning portion is not limited to the above. For example, the terminal positioning part may include a terminal holding part that holds a part of the terminal 18. Similarly, the shape of the tube positioning portion is not limited to the above. For example, the tube positioning part may include a tube clamping part that clamps a part of the tube.

  The squeezing mechanism 60 is a part that squeezes the heat-shrinkable tube 28B from the front end side toward the rear end side while the heat-shrinkable tube 28B is heat shrinking. Specifically, the diaphragm mechanism 60 includes a contact member, an elastic member 66, and a moving mechanism 70.

  The abutting member is a member that hits the heat shrinkable tube 28B while the heat shrinkable tube 28B is heat shrinking. Further, the contact member is provided so as to be movable from the front end side to the rear end side with respect to the heat shrinkable tube 28B. Specifically, in this case, the contact member includes a roller 62. Here, the roller 62 is provided so as to be movable from the front end side to the rear end side with respect to the heat shrinkable tube 28 </ b> B by the moving mechanism 70.

  The roller 62 is provided such that the direction perpendicular to the moving direction is the axial direction. The roller 62 is supported by the roller support portion 65 so as to be rotatable at least in the direction corresponding to the moving direction around the axis. The roller 62 hits the heat shrinkable tube 28B while rotating from the front end to the rear end of the heat shrinkable tube 28B during the heat shrinkage of the roller 62.

  The roller 62 may also contact the hot melt 29. In this case, it is conceivable that the roller 62 is also formed of Teflon (registered trademark) resin in the same manner as the pressing portion 56.

  Here, four rollers 62 are provided so as to come into contact with the heat-shrinkable tube 28B from four directions. Hereinafter, the pair of rollers 62 that come into contact with the heat shrinkable tube 28 </ b> B from both main surface sides of the terminal 18 among the four rollers 62 may be referred to as main surface side rollers 63. In addition, the pair of rollers 62 that come into contact with the heat-shrinkable tube 28B from both side surfaces of the terminal 18 may be referred to as side surface side rollers 64.

  When the contact member includes the roller 62, when the contact member moves against the heat-shrinkable tube 28B, an extra force is hardly applied to the heat-shrinkable tube 28B. Further, the four rollers 62 from four sides come into contact with the heat-shrinkable tube 28B, so that the entire periphery of the heat-shrinkable tube 28B can be more reliably squeezed.

  The moving mechanism 70 is provided so that the roller 62 can be moved. Here, the moving mechanism 70 is provided so that the elastic member 66 and the roller 62 can be moved. Here, the moving mechanism 70 is provided for each roller 62 so that each roller 62 can be moved independently. Specifically, the moving mechanism 70 includes a first moving mechanism 72, a second moving mechanism 74, and a slider member 76. Here, the driving of the moving mechanism 70 is controlled by the control unit 90 described later.

  The first moving mechanism 72 is provided to be able to move the roller 62 from the front end side to the rear end side with respect to the heat shrinkable tube 28B. Here, the first moving mechanism 72 is directly provided so as to be able to move the second moving mechanism 74 along the x-axis direction. That is, here, the first moving mechanism 72 is provided so that the roller 62 can be moved along the x-axis direction via the second moving mechanism 74. The first moving mechanism 72 includes a linear motor, a linear drive mechanism having a screw shaft, a motor that rotationally drives the screw shaft, and a nut portion screwed to the screw shaft, or a linear actuator such as an air cylinder or a hydraulic cylinder. Is done.

  The second moving mechanism 74 is provided to be able to move the roller 62 along a direction intersecting the first moving mechanism 72. The second moving mechanism 74 is provided so that the roller 62 can move toward or away from the heat-shrinkable tube 28B. Here, the second moving mechanism 74 is provided so that the slider member 76 can be moved directly along the y-axis direction or the z-axis direction. That is, here, the second moving mechanism 74 is provided so that the roller 62 can be moved along the y-axis direction or the z-axis direction via the slider member 76. More specifically, the second moving mechanism 74 provided for moving the main surface side roller 63 of the second moving mechanism 74 moves the main surface side roller 63 along the z-axis direction with respect to the heat shrinkable tube 28B. It is possible to move closer or away. The second moving mechanism 74 provided to move the side roller 64 out of the second moving mechanism 74 moves the side roller 64 toward or away from the heat shrinkable tube 28 along the y-axis direction. It is provided to be movable. The second moving mechanism 74 includes a linear motor, a linear drive mechanism having a screw shaft, a motor that rotationally drives the screw shaft, and a nut portion screwed to the screw shaft, or a linear actuator such as an air cylinder or a hydraulic cylinder. Is done.

  Here, the slider member 76 is movably provided in the second moving mechanism 74 and is connected to the elastic member 66.

  The elastic member 66 is provided for each roller 62. Here, the elastic member 66 connects the roller support portion 65 and the slider member 76. The elastic member 66 is provided so as to be elastically deformable along the direction in which the roller 62 moves toward or away from the heat-shrinkable tube 28B. That is, here, the elastic member 66 is provided so as to be elastically deformable along the direction in which the second moving mechanism 74 moves the roller 62. Accordingly, the elastic member 66 provided on the main surface side roller 63 is provided so as to be elastically deformable along the z-axis direction, and the elastic member 66 provided on the side surface side roller 64 is provided so as to be elastically deformable along the y-axis direction. It has been.

  By providing the elastic member 66, the roller 62 can be easily moved along the outer shape of the workpiece W. More specifically, while the roller 62 is being moved from the front end side to the rear end side of the heat shrinkable tube 28 by the first moving mechanism 72, the roller 62 is moved to the heat shrinkable tube 28B by the second moving mechanism 74. On the other hand, the change in the outer shape of the workpiece W can be absorbed by the elastic member 66 elastically deforming without being moved close to or away from it. Thereby, control of the moving mechanism 70 becomes easy.

  Further, by providing the elastic member 66, the force with which the roller 62 abuts against the workpiece W can be easily stored within a predetermined range. More specifically, while the roller 62 is moved from the front end side to the rear end side of the heat shrinkable tube 28B by the first moving mechanism 72, the elastic deformation amount of the elastic member 66 falls within a predetermined range. By moving the position of the roller 62 by the second moving mechanism 74 as described above, the roller 62 can always be brought into contact with the heat shrinkable tube 28B with a force within a predetermined range. Thereby, it can suppress more reliably that the hot-melt 29 is restrict | squeezed too much or that the hot-melt 29 is insufficiently squeezed.

  The heating mechanism 80 is provided so that the heat-shrinkable tube 28B can be heated in a state in which the heat-shrinkable tube 28B before shrinkage is covered with the electric wire 11 with terminal. The heating mechanism 80 heats the heat shrinkable tube 28 </ b> B via the roller 62. For example, it is conceivable that the heating mechanism 80 is incorporated in the roller 62 or the heating mechanism 80 is incorporated in the roller support portion 65. The form of heating by the heating mechanism 80 may be any of heat conduction, advection, and heat radiation. When a plurality of rollers 62 are provided, the heating mechanism 80 may be incorporated in all the rollers 62, or the heating mechanism 80 may be incorporated only in some of the rollers 62. For example, the heating mechanism 80 may be incorporated only in the main surface side roller 63 and the heating mechanism 80 may not be incorporated in the side surface side roller 64.

  The heating mechanism 80 heats the heat-shrinkable tube 28B via the roller 62, so that the portion of the heat-shrinkable tube 28B that contacts the roller 62 can be heat-shrinked first. At this time, since the heat-shrinkable tube 28B is squeezed from the front end toward the rear end, the front end side of the heat-shrinkable tube 28B can be heat-shrinked first. For this reason, it is possible to create a situation in which the heat shrinkage of the heat shrinkable tube 28B to which the roller 62 is moved is not completed. Accordingly, the gap between the inner surface of the heat-shrinkable tube 28 </ b> B and the terminal-attached electric wire 11 at the movement destination of the roller 62 becomes larger than the gap at the portion after the roller 62 has moved, so that surplus of the hot melt 29 is obtained. The minute moves more reliably to the rear end side of the heat shrink tube 28B. These prevent the adhesive from flowing out from the opening on the front end side of the heat shrinkable tube 28B.

  The heat-shrinkable tube mounting device 40 according to the present embodiment includes a control unit 90 that controls the overall operation of the device. The control unit 90 is configured by a general microcomputer including a CPU, a ROM, a RAM, and the like, and is connected to each driving unit of the present apparatus. And the control part 90 is a structure which controls the operation | movement including the operation | movement which squeezes, shrinking | contracting the heat contraction tube 28B according to the software program stored beforehand.

<Manufacturing method>
Next, the method to manufacture the electric wire 10 with a heat contraction tube using the said heat contraction tube attachment apparatus 40 is demonstrated.

  First, as shown in FIG. 2, the workpiece W is formed and the workpiece W is set in the heat shrinkable tube mounting device 40.

  Specifically, first, the heat-shrinkable tube 28B is placed on the connecting portion 12 of the terminal-attached electric wire 11, and an adhesive is disposed in the heat-shrinkable tube 28B. More specifically, a hot melt 29 is applied as an adhesive to the inner surface of the heat shrinkable tube 28B in advance. Then, the heat shrinkable tube 28 </ b> B to which the hot melt 29 is applied is put on the connecting portion 12. Thereafter, the workpiece W is set on the base body 50. More specifically, the terminal 18 is positioned by bringing the tip of the terminal 18 into contact with the terminal support portion 52 and inserting the positioning pin 54 into the hole 20 h of the mating connection portion 20 of the terminal 18. Thereby, the electric wire 11 with a terminal is positioned. Then, with the heat-shrinkable tube 28B covered at a predetermined position with respect to the terminal-attached electric wire 11, the rear end edge of the heat-shrinkable tube 28B is pressed by the presser 56 to position the heat-shrinkable tube 28B. In this state, the roller 62 is located at a position away from the heat shrinkable tube 28B on the front end side of the heat shrinkable tube 28B.

  Next, the roller 62 is brought into contact with the front end of the heat shrinkable tube 28B. Further, here, the heat shrinkable tube 28 </ b> B is pressed toward the terminal 18 by the roller 62. Specifically, by driving the second moving mechanism 74, the roller 62 is moved closer to the heat-shrinkable tube 28B along the y-axis direction or the z-axis direction via the slider member 76. At this time, the roller 62 is further moved to the terminal 18 side from the position where the roller 62 first contacts the heat shrinkable tube 28B. Preferably, the heat shrinkable tube 28 </ b> B located outside the main surface of the terminal 18 may be pressed toward the terminal 18 by the main surface side roller 63.

  When a plurality of rollers 62 are provided, all the rollers 62 may be brought into contact with the heat-shrinkable tube 28B from the beginning, or only some of the rollers 62 may be brought into contact with the heat-shrinkable tube 28B first. For example, it is also conceivable that only the main surface side roller 63 is first brought into contact with the heat shrinkable tube 28B, and the side roller 64 is brought into contact with the heat shrinkable tube 28B when the front end of the heat shrinkable tube 28B is thermally contracted to some extent.

  With the roller 62 in contact with the heat shrinkable tube 28B, the heat shrinkable tube 28B is heated by the heating mechanism 80. Here, the heating mechanism 80 heats the heat shrinkable tube 28 </ b> B via the roller 62. That is, since the roller 62 directly heats the heat-shrinkable tube 28B, as shown in FIGS. 3 and 4, the heat-shrinkable tube 28B starts heat shrinkage from the portion where the roller 62 is in contact, that is, from the front end side. .

  When the thermal contraction of the front end of the heat-shrinkable tube 28B is almost completed and the front end of the heat-shrinkable tube 28B is in close contact with the periphery of the terminal 18 with the hot melt 29 interposed therebetween, the roller 62 is thermally contracted as shown in FIG. The tube 28B is moved from the front end side to the rear end side. Specifically, by driving the first moving mechanism 72, the roller 62 is moved from the front end side to the rear end side of the heat-shrinkable tube 28B along the x-axis direction via the second moving mechanism 74 and the slider member 76. . At this time, the roller 62 moves to the rear end side while rotating along the outer surface of the heat shrinkable tube 28B. Thereby, an extra force is hardly applied to the heat shrinkable tube 28B.

  More specifically, when the heat-shrinkable tube 28B is heated, the heat-shrinkable tube 28B transitions to return to a thin tube before being stretched. In the middle of this, the thermal contraction of the heat shrinkable tube 28 </ b> B is inhibited by the connecting portion 12, and the heat shrinkable tube 28 is thermally contracted into a shape corresponding to the outer shape of the connecting portion 12. The hot melt 29 in the heat shrinkable tube 28B is softened or melted by the heat of the heating mechanism 80, further receives the heat shrinkage of the heat shrinkable tube 28B, fills the gap between the connecting portion 12 and the heat shrinkable tube 28, and an excess amount. Tends to flow out of the opening of the heat-shrinkable tube 28B.

  Here, since the heat-shrinkable tube 28B is heated via the roller 62, the portion of the heat-shrinkable tube 28B that contacts the roller 62 can be heat-shrinked first. At this time, since the heat-shrinkable tube 28B is squeezed from the front end toward the rear end, the front end side of the heat-shrinkable tube 28B can be heat-shrinked first. That is, it is possible to create a situation in which the thermal contraction on the front end side with respect to the roller 62 is completed in a state where the thermal contraction on the rear end side with respect to the roller 62 is not completed in the heat contraction tube 28B. As a result, the gap between the inner surface side of the heat-shrinkable tube 28 </ b> B on the rear end side with respect to the roller 62 and the terminal-attached electric wire 11 becomes larger than the gap on the front end side with respect to the roller 62. The surplus portion can easily move to the rear end side of the heat-shrinkable tube 28B. For this reason, the hot melt 29 is unlikely to flow out of the opening on the front end side of the heat shrinkable tube 28B.

  Further, when the roller 62 presses the heat-shrinkable tube 28B toward the terminal-attached electric wire 11, the gap between the inner surface of the heat-shrinkable tube 28B and the terminal-attached electric wire 11 becomes small at the pressed portion. Accordingly, the hot melt 29 located on the rear end side from the roller 62 is less likely to move to the front end side than the roller 62.

  Further, the more the roller 62 moves to the rear end side of the heat shrinkable tube 28B, the farther the front end of the heat shrinkable tube 28B is from the heating mechanism 80. For this reason, when the roller 62 moves to the rear end side of the heat shrinkable tube 28B, the amount of heat lost due to discharge or the like compared to the amount of heat transferred from the rear end side by heat conduction in the work W at the front end of the heat shrinkable tube 28B. The amount can be large. In this case, the front end side is cooled, and if the degree is large, the hot melt 29 starts to be cured. Then, when the hot melt 29 is cured at the front end of the heat shrinkable tube 28B, the cured adhesive hinders the softened hot melt 29 on the rear end side of the heat shrinkable tube 28B from flowing toward the front end side. This also makes it difficult for the hot melt 29 to flow out of the opening on the front end side of the heat shrinkable tube 28B.

  When the roller 62 is moved by the first moving mechanism 72, here, as described above, the change in the outer shape of the workpiece W is absorbed by the elastic deformation of the elastic member 66 without moving the roller 62 by the second moving mechanism 74. Let Thereby, control of the moving mechanism 70 becomes easy. At this time, here, the roller 62 is moved from the front end to the rear end side of the heat shrinkable tube 28 </ b> B in a state where the heat shrinkable tube 28 </ b> B is pressed toward the terminal-attached electric wire 11 by the roller 62. The outer shape of the terminal-attached electric wire 11 having a ground terminal usually has a shape in which a portion where the electric wire connecting portion 22 is present is thicker than a portion where the front end of the heat shrinkable tube 28 is covered. Therefore, if the elastic member 66 is contracted when the roller 62 is in contact with the front end of the heat shrinkable tube 28, the roller 62 can be moved from the front end of the heat shrinkable tube 28B without driving the second moving mechanism 74. Until the position of the wire connecting portion 22 is reached, the elastic member 66 is kept in a contracted state. That is, the state in which the heat shrinkable tube 28 </ b> B is pressed toward the terminal-attached electric wire 11 by the roller 62 is maintained. However, the second moving mechanism 74 may be moved so that the elastic member 66 is elastically deformed within a predetermined range while the roller 62 is being moved by the first moving mechanism 72. In this case, the work W can be narrowed with a constant force as much as possible.

  When the roller 62 is moved to the rear end side of the heat shrinkable tube 28B and the heat shrinkage on the rear end side is completed, the heating is stopped and the roller 62 is retracted from the heat shrinkable tube 28. In order to retract the roller 62 from the heat shrinkable tube 28, for example, it is conceivable that the roller 62 is moved away from the heat shrinkable tube 28 by driving the second moving mechanism 74. Thereafter, the workpiece is removed from the base body 50. Thereby, the heat shrinkable tube-attached electric wire 10 in which the heat-shrinkable tube 28 is attached to the terminal-attached electric wire 11 is completed.

  In addition, it is not essential to move the roller 62 to the rear end edge portion of the heat shrinkable tube 28B. The roller 62 may be in a standby state in contact with the intermediate portion of the heat-shrinkable tube 28B, and may wait for heat to be transferred to the rear end side and the portion to be thermally contracted.

<Effects>
According to the manufacturing method of the electric wire with heat shrinkable tube 10 configured as described above, the step of covering the electric wire with terminal 11 with the heat shrinkable tube 28B and disposing the hot melt 29 in the heat shrinkable tube 28B, and the heat shrinkable tube And the step of squeezing the heat shrinkable tube 28B from the front end toward the rear end by the contact member that moves against the outer surface of the heat shrinkable tube 28B while heat shrinking the heat shrinkable tube 28B. It is difficult to flow out from the front end opening of 28B. Thereby, it can suppress more reliably that the hot melt 29 provided between the heat contraction tube 28B and the electric wire 11 with a terminal flows out to the other party connection part 20 side of the terminal 18. FIG.

  Further, the contact member includes a roller 62 that is supported so as to be rotatable at least in a direction corresponding to the moving direction out of the circumference of the axial center, and the roller 62 is the heat shrinkable tube 28B. Therefore, when the contact member moves along the outer surface of the heat-shrinkable tube 28B, it is difficult to apply an extra force.

  Moreover, since the contact member contacts the heat shrinkable tube 28B from four directions, the entire periphery of the heat shrinkable tube 28B can be more reliably squeezed.

  Further, since the heat-shrinkable tube 28B is heated via the contact member, the portion of the heat-shrinkable tube 28B that is in contact with the contact member can be thermally contracted first. At this time, since the heat-shrinkable tube 28B is squeezed from the front end toward the rear end, the front end side of the heat-shrinkable tube 28B can be heat-shrinked first. For this reason, it is possible to create a situation in which the heat shrinkage of the heat shrink tube 28 to which the contact member is moved is not completed, and the inner surface side of the heat shrink tube 28B to which the contact member is moved and the terminal-attached electric wire 11. Since the gap therebetween becomes larger than the portion after the contact member moves, the surplus portion of the hot melt 29 moves more reliably to the rear end side of the heat shrinkable tube 28B. This makes it difficult for the hot melt 29 to flow out of the opening on the front end side of the heat shrinkable tube 28B.

  In addition, since the step of pressing the rear edge of the heat shrink tube 28B is included when the heat shrink tube 28B is squeezed, the heat shrink tube 28B is a terminal when the heat shrink tube 28B is squeezed from the front end side toward the rear end side. It is possible to suppress displacement of the attached electric wire 11 toward the other end side opposite to the side where the heat shrinkable tube 28B is provided.

{Modification}
Next, a modified example of the contact member will be described. 6 and 7 are explanatory views showing modifications of the contact member.

  The contact member according to the modification is provided such that the contact form can be deformed according to the outer shape of the terminal-attached electric wire 11 during movement. Here, the main surface side roller 163 of the main surface side roller 163 is provided with a deformable contact form in accordance with the outer shape of the terminal-attached electric wire 11 while the main surface side roller 163A on the side where the electric wire 13 is located.

  Specifically, here, the main surface side roller 163A is composed of a plurality of (here, five) small rollers 163s. The five small rollers 163s are provided so as to be arranged along the axial direction (here, along the y-axis direction). The five small rollers 163 s are connected to one moving mechanism 70 via different elastic members 66. Accordingly, the five small rollers 163s can be moved independently of each other along the z-axis direction by elastic deformation of the elastic members 66 connected thereto.

  When the main surface side roller 163A is in contact with the heat shrinkable tube 28B by the second moving mechanism 74, the first moving mechanism 72 moves the terminal from the front end to the rear end of the heat shrinkable tube 28B. When a change occurs in the outer shape of the attached electric wire 11, the five small rollers 163 s change the contact form according to the change in the outer shape of the electric wire 11 with a terminal. In the example shown in FIG. 7, the portion of the terminal-attached electric wire 11 with which the main surface side roller 163A abuts has a shape that gradually protrudes in the z-axis direction from both ends along the y-axis direction toward the center. In accordance with the outer shape of the terminal-attached electric wire 11, the elastic member 66 connected to the small roller 163s contracts toward the middle of the five small rollers 163s and shifts to the positive position side in the z-axis direction.

  According to such an abutting member, since the abutting form is provided so as to be deformable according to the outer shape of the terminal-attached electric wire 11 during movement, it is necessary to squeeze the adhesive too much or the adhesive squeezing is insufficient. Can be suppressed.

  The configuration in which the contact form can be deformed according to the outer shape of the terminal-attached electric wire 11 while the contact member is moving is not limited to the above. For example, the part including the contact surface of the contact member may be formed of a flexible member such as rubber, and the shape of the contact surface may be deformed according to the outer shape of the terminal-attached electric wire 11.

{Other variations}
In the embodiment, the diaphragm mechanism 60 has been described as including the moving mechanism 70, but this is not essential. Further, although the movement mechanism 70 has been described as including the first movement mechanism 72 and the second movement mechanism 74, this is not essential. The moving mechanism 70 may not include one of the first moving mechanism 72 and the second moving mechanism 74. For example, when the diaphragm mechanism does not include the moving mechanism 70, or when the moving mechanism does not include the first moving mechanism 72, the workpiece W may be moved toward the roller 62 with the roller 62 positioned at a predetermined position. Good. Further, for example, when the diaphragm mechanism does not include the moving mechanism 70 or when the moving mechanism does not include the second moving mechanism 74, the operator may set the roller 62 so as to contact the heat shrinkable tube 28B. .

  In addition, although it has been described that a plurality of rollers 62 are provided, this is not essential. There may be a case where only one roller 62 is provided. In this case, the surface of the workpiece opposite to the surface facing the roller 62 side is preferably supported by the base body 50 or the like.

  In addition, each structure demonstrated by said each embodiment and each modification can be suitably combined unless it mutually contradicts.

  Moreover, although the heating mechanism 80 demonstrated as what heats the heat-shrinkable tube 28B via the roller 62, this is not essential. The heating mechanism may directly heat the heat-shrinkable tube 28B.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Electric wire with heat shrinkable tube 11 Electric wire with terminal 12 Connection part 13 Electric wire 18 Terminal 20 Opposite side connection part 20h Hole 22 Electric wire connection part 26 Connection part 28,28B Heat shrinkable tube 29 Hot melt 40 Heat shrinkable tube mounting apparatus 50 Base 52 Frame 54 Positioning Pins 56 Pressing Unit 60 Drawing Mechanism 62 Roller 66 Elastic Member 70 Moving Mechanism 80 Heating Mechanism 90 Control Unit

Claims (7)

(A) covering the heat-shrinkable tube over the electric wire with terminal and disposing an adhesive in the heat-shrinkable tube;
(B) squeezing the heat-shrinkable tube from the front end toward the rear end by a contact member that moves against the outer surface of the heat-shrinkable tube while shrinking the heat-shrinkable tube;
A method for manufacturing an electric wire with a heat-shrinkable tube. It is a manufacturing method of the electric wire with a heat contraction tube of Claim 1,
The abutting member includes a roller that is supported so as to be rotatable in a direction corresponding to at least the movement direction out of the circumference of the axis with the direction orthogonal to the movement direction as the axis direction.
The manufacturing method of the electric wire with a heat contraction tube which the said roller contacts, rotating from the front end to the rear end of the said heat contraction tube. It is a manufacturing method of the electric wire with a heat contraction tube according to claim 1 or 2,
The said contact member is a manufacturing method of the electric wire with a heat contraction tube which contacts the said heat contraction tube from four directions. It is a manufacturing method of the electric wire with a heat contraction tube according to any one of claims 1 to 3,
A manufacturing method of an electric wire with a heat contraction tube which heats the heat contraction tube via the contact member. It is a manufacturing method of the electric wire with a heat contraction tube of any one of Claims 1-4, Comprising:
The said contact member is a manufacturing method of the electric wire with a heat-shrinkable tube in which a contact form deform | transforms according to the external shape of the said electric wire with a terminal during a movement. It is a manufacturing method of the electric wire with a heat contraction tube of any one of Claims 1-5,
A method of manufacturing an electric wire with a heat-shrinkable tube, comprising a step of pressing a rear edge of the heat-shrinkable tube when the heat-shrinkable tube is squeezed. A heating mechanism provided to heat the heat-shrinkable tube in a state where the heat-shrinkable tube before shrinkage is covered on the electric wire with terminal;
A throttle mechanism including an abutting member that moves from the front end side toward the rear end side with respect to the heat shrinkable tube while hitting the heat shrinkable tube while the heat shrinkable tube is being heat-shrinked;
A heat shrinkable tube mounting device.

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