JP3687446B2 - Braid reversing device for shielded wire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a braid reversing device used for terminal processing of shielded wires.
[0002]
[Prior art]
As shown in FIG. 10, the shielded electric wire has a structure in which the conductor S ₁ is sequentially covered with an insulating coating S ₂ , a conductive braid S _3, and an insulating outer sheath S ₄ .
[0003]
When attaching a terminal or the like to the terminal portion of the shielded electric wire A, first, the outer shell S _{4 of the} terminal portion is peeled to a predetermined length to expose the braid S ₃ , and then the braid S ₃ is rolled up on the outer shell S _4. , then, it is necessary to expose the conductor S ₁ of the center is stripped exposed insulating coating S _2.
[0004]
Particularly problematic in this terminal processing is the braiding process. This braid must be loosened and then flipped over and rolled up on the outer skin, which is difficult to process unlike the outer skin or insulation coating that is simply peeled off.
[0005]
In order to efficiently perform the process, Japanese Utility Model Publication No. 8-4714 discloses that the braid is spread with a cylindrical body, and then squeezed onto the outer skin at the entrance of the hole of the jig into which the cylindrical body is immersed. A jig to be reversed is proposed.
[0006]
In addition, the jig of the above publication requires that the exposed end of the braid be loosened with a finger before inserting the cylindrical body, and the processing is not fully automated, so the applicant must Japanese Patent Application No. 10-267993 proposes a terminal processing apparatus that loosens and spreads the braid without any need.
[0007]
[Problems to be solved by the invention]
The above processing device proposed by the present applicant hits the front end of the braid exposed by a pair of opposing punches from the outside, and intermittently rotates the punch around the outer periphery of the electric wire to repeat the hitting operation at each position of rotation. Bend the tip side outward and bend it open. After that, the reversing members arranged opposite each having a semicircular groove are driven by an air cylinder and brought into contact with each other on the outer periphery of the electric wire (before that, sucked inside the braid as proposed in Japanese Patent Application No. 11-89321) The braid may be further expanded by inserting a pipe or the like), and the reversing member is moved from the front end side to the rear end side of the electric wire by a slide mechanism to press and reverse the braid.
[0008]
Such a processing apparatus finishes the braid reversed by holes formed between the reversing members when reversing the braid, but the folded portion of the braid does not sufficiently plastically deform only by squeezing with the reversing member, and the outer shell is caused by backlash action. The braid that was rolled up floated up from the outer skin and the quality was not stable, which sometimes hindered subsequent processing.
[0009]
An object of the present invention is to provide a braid reversing device for a shielded electric wire in which a braid that has been reversed without such a problem is finished to a stable shape.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a clamp mechanism for holding a shielded electric wire at a positioning point, and a braid previously peeled off at the tip of the electric wire by peeling off the outer skin and hitting the tip side of the braid A braiding reversing device having a braid expanding mechanism that bends outwardly and bending the reversing member surrounding the outer periphery of the electric wire relative to the electric wire in the longitudinal direction of the electric wire, and the braiding with the tip expanded by the reversing member. In addition, a braid reversing mechanism that folds back on the outer sheath of the electric wire and a forming mechanism that pressurizes from the outside with a forming tool obtained by dividing the inverted braid into a plurality of portions in the circumferential direction and attaches to the outer sheath of the electric wire.
[0011]
In this braid reversing device, the forming tool is provided with a forming surface of a taper hole whose diameter is reduced toward the distal end side of the electric wire, and a slide mechanism for moving the forming tool relative to the electric wire in the longitudinal direction of the electric wire. It is preferable that the inverted braid be included again with a forming tool.
[0012]
[Action]
The braid that has just been reversed with a reversing member is not sufficiently plastically deformed, and a backlash occurs due to the elastic restoring force of the strands and rises from the outer skin.
[0013]
On the other hand, the braid treated by the reversing device of the present invention has a folded portion that is pressed against the forming tool and has a tight bend, and the 90 ° bent shape is maintained and is almost in contact with the outer sheath of the wire. Follow the surface.
[0014]
If the forming tool is provided with a forming surface having a taper hole, the forming pressure can be increased and the braid after reversal can be squeezed again by the forming tool, and the squeezing of the braid after forming can be further improved by the re-squeezing. The molding pressure increases as the hole diameter at the small-diameter end of the tapered hole is reduced. However, if the hole diameter is reduced as a whole, the molding tool does not move against the stepped portion on the outer periphery of the electric wire, and ironing cannot be performed. If a tapered hole is used, this problem does not occur.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of a braid reversing device of the present invention. In FIG. 1, as shown in FIG. 10A, the shield wire A in which a part of the outer sheath S ₄ is peeled off in advance and a part of the braid S ₃ is exposed is processed to invert the braid S _3. , then, a terminal processing apparatus for exposing the conductors S ₁ as shown in FIG. 10 (b) strip off the inner insulator predetermined length.
[0016]
The terminal processing apparatus 1 includes a clamp unit 2 that holds the shielded electric wire A at a positioning point, a peeling unit 3 for an internal insulator, an expansion unit 4 that performs an expansion process of a braid, and a braid reversing unit 5. The knitting composition unit 6 and the slide mechanism 7 are provided. This exemplary terminal processing apparatus may be considered to be obtained by adding the peeling unit 3 to the braid reversing apparatus.
[0017]
A stay 9 is erected on the base plate 8, and a clamp unit 2 is mounted on the stay 9 so as to hold the shielded electric wire A between a pair of opposed clamps 2 a and hold it on the work center.
[0018]
The slide mechanism 7 has a slider 7b that moves back and forth in the longitudinal direction of the electric wire while controlling the position with a drive source 7a such as a servomotor. A U-shaped mounting plate 10 in front view is erected on the slider 7b, and a perforated gear disk 12 is rotatably mounted on the mounting plate 10 via a guide roller 11. As shown in FIG. 12, a skin peeling unit 3, an expansion unit 4, a braid reversing unit 5 and a knitting composition unit 6 are attached.
[0019]
The gear disk 12 is driven by a motor 14 via a gear 13 that meshes with the outer peripheral teeth 12a, and is rotated intermittently when necessary. The apparatus shown in the figure includes auxiliary elements such as sensors necessary for controlling the rotation angle of the gear disk 12, but the auxiliary elements are not shown in the drawing.
[0020]
The skinning unit 3 pushes and moves the pair of opposing skinning blades 3a with the air cylinder 3b to cut into the inner insulator of the shielded electric wire.
[0021]
The expansion unit 4 moves the punch 4a with the air cylinder 4b and strikes the braid exposed at the end of the electric wire from the outside. This tapping is performed at each position of rotation by intermittently rotating the gear disk 12 at an appropriate angle so that loosening and warping due to the tapping of the braid occur on average in each part in the circumferential direction.
[0022]
Here, the expansion unit 4 is moved along the outer periphery of the electric wire. However, the same object can be achieved even if the electric wire is rotated to strike the braid with the expansion unit fixed in position.
[0023]
The reversing unit 5 has a pair of reversing members 5a having a semicircular groove facing each other, and the pair of reversing members 5a are driven by an air cylinder 5b so that they are brought into contact with each other. A hole H (see FIG. 7) slightly larger than the outer diameter of the electric wire is created.
[0024]
The knitting composition unit 6 drives a pair of opposing forming tools 6a with an air cylinder 6b to press-mold the inverted braid from the outside.
[0025]
FIG. 4 shows a preferred form of the forming tool 6a, and each forming tool 6a has a forming surface 6c in which the tapered hole is divided in half at the abutting portion.
[0026]
As shown in FIG. 2, the terminal processing apparatus 1 configured as described above holds the shielded electric wire A at the positioning point by the clamp unit 2 and operates the expansion unit 4 in this state. Striking the tip side of the braid S ₃ exposed punch 5a at each position of the rotation while the gear disk 12 is intermittently rotated, as shown in FIG. 5, the braid S ₃ loosened further, bent outwardly The end of the braid expands.
[0027]
Thereafter, the braid expanding pipe 15 may be inserted between the internal insulator S ₂ and the braid S ₃ as shown in FIG. 6 to further expand the braid S ₃ .
[0028]
Next, as shown in FIG. 7, reversing member 5a closed, which is moved rightward in FIG, squeezes the braid S ₃ is inverted, tuck on skin S _4. In this case, after the braid S ₃ was inverted fallen once, not cleanly come up to the outer skin S ₄ drifted up slightly elastic restoring force of the wire. Therefore, as shown in FIG. 8, the folded portion of the braid S ₃ is pressed from the outside with the forming tool 6 a of the forming unit 6, and a firm bend is applied. Thereafter, cleanly live up to the surface of the skin S ₄ as former 6a are moved in the entire region of the braid when squeezed braided inverted in this former 6a again is well formed in the arrow direction shown in FIG.
[0029]
Thereafter, to Nyuha the skinning blade 3a inside insulator S ₂ exposed, the conductor S ₁ Removing ironing internal insulator S ₂ cut by moving the skinning blade 3a the wire distally exposed Terminal processing is completed.
[0030]
Although the molding tool 6a shown in FIG. 4 is preferable, the molding tool 6a in the case where re-ironing of the braid is unnecessary does not particularly require a taper gradient of the molding surface.
[0031]
【The invention's effect】
As described above, the braid reversing device according to the present invention includes a molding tool for pressure-forming the braid so that the braid after the reversal is firmly bent, so that the backlash of the braid after the reversal is caused. There is no lifting, and a terminal processed part with stable shape and quality can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a terminal processing apparatus employing a braid reversing apparatus according to the present invention. FIG. 2 is a side sectional view of the same apparatus. FIG. FIG. 5 is a side view showing a state in which the braid end is expanded. FIG. 6 is a side view in which the braid is further expanded with a braid expansion pipe. FIG. FIG. 8 is a view showing a forming process of a braid after reversing by a forming tool of a forming unit. FIG. 9 is a side view showing an end of an electric wire after forming a knitted composition. FIG. Perspective view of electric wire (b) Perspective view of shielded electric wire with internal insulation stripped after braid reversal [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Terminal processing apparatus 2 Clamp unit 3 Peeling unit 4 Expansion unit 5 Braiding reversing unit 5a Reversing member 5b Air cylinder 6 Knitting composition unit 6a Molding tool 6b Air cylinder 7 Slide mechanism 8 Base plate 9 Stay 10 Mounting plate 12 Gear disk 15 Braid expansion pipe A Shielded wire S ₁ Conductor S ₂ Internal insulator S ₃ Braid S ₄ Outer sheath

Claims (1)

A clamp mechanism that holds the shielded electric wire at the positioning point, a braid expanding mechanism that peels the outer skin and strikes the braid previously exposed at the tip of the electric wire from the outside, and warps the leading end of the braid outward, and the electric wire The reversing member surrounding the outer periphery of the wire is moved relative to the electric wire in the longitudinal direction of the electric wire, and the braiding reversing mechanism that folds the braid whose tip is widened by the reversing member and folds it on the outer sheath of the electric wire, and the reversed braiding in the circumferential direction pressurized from the outside in the molding tool is divided into a plurality of Ri formed and a molding mechanism Sowaseru the outer skin of the wire, the former, provided with a molding surface of the tapered hole whose diameter decreases toward the distal end side of the wire And a braid reversing device for a shielded electric wire that includes a slide mechanism for moving the forming tool relative to the electric wire in the longitudinal direction of the electric wire so that the braid after reversal is re-secured with the forming tool .

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