Core position detector for processing an end of a shield wire and method for processing an end of a shield wire

Abstract

A core wire position detector is equipped with: a close contact means by which a shielding material exposed by peeling off a sheath can be brought into close contact with a core wire over the entire periphery at a given position that is far away from the front end of an electric wire by a given length toward the base end side; the measuring device is used for measuring the size of the cross section of the shielding material along the diameter direction of the electric wire on the whole periphery at a given position; and the calculation device is used for calculating the arrangement of the two core wires at the given position according to the measurement result of the measurement device.

Description

Technical Field

[0001] The present invention relates to a core wire position detection device which detects the relative position relationship between a plurality of core wires hidden in a shielding material (mainly a braid) during terminal processing of a shielded electric wire, and to a terminal processing method for a shielded electric wire performed by the device. Background Art

[0002] Among various types of shielded electric wires, there is a shielded electric wire used for high-speed communication in which a plurality of (eg, two) core wires (signal wires) are twisted spirally and arranged in a shielding material (mainly a braid) covered with a sheath made of an insulating resin.

[0003] This type of shielded wire has two twisted core wires, so the position of the two core wires arranged side by side in the wire cross section (e.g., the arrangement angle relative to the horizontal line) is different depending on the position in the wire length direction. Each twist pitch of the two core wires reaches the same arrangement position, and the conditions of this twisting are predetermined in the specifications of each type of wire.

[0004] Shielded connectors are used to connect shielded electric wires. As examples of shielded connectors attached to terminals of this type of shielded electric wires, Fig.11 The shielded connector shown is known (see, for example, Patent Document 1).

[0005] The shielded connector 200 includes an external housing 201 made of resin, an external terminal (shielding shell) 202 made of metal and inserted into the external housing 201, an internal housing 203 made of resin and disposed in a tubular housing accommodating portion 202a of the external terminal 202, and an internal terminal (inner terminal) 20 made of metal and attached to a terminal accommodating hole 203a of the internal housing 203. An impedance adjusting member 204 may also be arranged between the internal housing 203 and the internal terminal 20 as required.

[0006] For example, the terminal processing of attaching the shielded connector 200 to the shielded electric wire 10 is performed as follows. Here, in the shielded electric wire 10, a braid (shielding material) 12 is provided inside a sheath 11 made of resin at the outermost periphery, and two core wires 15, 15 are twisted together and provided inside the braid 12. A shield foil (aluminum foil or copper foil) is also provided between the core wires 15, 15 and the braid 12.

[0007] In the terminal processing, first, the sheath 11 of the terminal of the shielded electric wire 10 is stripped of a predetermined length. By stripping the sheath 11 of the terminal of the shielded electric wire 10, the braid 12 surrounding the two core wires 15 is exposed. Next, the metal tubular sleeve 13 is installed and fixed to the outer periphery of the base end of the braid 12 by crimping. This state is as shown in FIG. Fig.11(a) shown.

[0008] Next, the terminal portion of the braid 12 is cut (trimmed) to a predetermined size, the braid 12 is folded back toward the wire base end side at the end edge of the sleeve 13, and the folded back portion 12a of the braid 12 is covered so as to overlap with the outer periphery of the sleeve 13. This state is as shown in FIG. Fig.11 (b) as shown.

[0009] By trimming and folding back the braid 12 in this way, the two core wires 15, 15 are exposed. Here, when the shielding foil is provided to cover the outer periphery of the core wires 15, 15, the shielding foil is cut at the end portion of the folded back portion 12a of the braid 12 to expose the two core wires 15, 15.

[0010] At this stage, since the core wires 15, 15 are still twisted, at least their terminal portions are untwisted to extend the two core wires 15, 15 in a straight line, and then the insulating sheaths 15b, 15b at the front ends of the core wires 15, 15 are stripped off to expose the core wire conductors 15a, 15a, and the internal terminals 20, 20 are respectively connected to the core wire conductors 15a, 15a by crimping.

[0011] Thereafter, the internal terminals 20, 20 are accommodated in the terminal accommodation holes 203a, 203a of the internal housing 203, and the internal housing 203 is accommodated in the tubular housing accommodation portion 202a of the external terminal 202. The braid crimping piece 202b of the external terminal 202 is crimped to the folded back portion 12a of the braid 12 and the sleeve 13, and the sheath crimping piece 202c of the external terminal 202 is fixed to the sheath 11 by crimping. Thus, the internal module 200A is completed, and the internal module 200A is inserted into the external housing 201, thereby completing the attachment of the shielded connector 200 to the terminal of the shielded electric wire 10.

[0012] Reference List

[0013] Patent Literature

[0014] Patent Document 1: JP2021-86677A Summary of the invention

[0015] Technical issues

[0016] In the shield connector 200 for high-speed communication having such a configuration, it is required to eliminate the influence of external noise on the core wires 15, 15 as much as possible. For this purpose, it is necessary to strictly manage the length of the two core wires 15, 15 exposed from the braid (shielding material) 12.

[0017] Fig.12 and 13 The relationship among the braid (shielding material) 12 , the two core wires 15 and 15 , and the inner terminal 20 is schematically shown. Fig.12 The arrangement of the two core wires 15, 15 at the position A (the position indicated by Δ in the figure) of the end portion 12e of the braid 12 and the arrangement of the two core wires 15, 15 at the position of the connection portion with the internal terminal 20 are different (deviation) in the circumferential direction of the wire. The upper figure is a side view, and the lower figure is a top view. Fig.13 The arrangement of the two core wires 15, 15 at the position A (the position indicated by Δ in the figure) of the end portion 12e of the braid 12 and the arrangement of the two core wires 15, 15 at the position of the connection portion with the internal terminal 20 are consistent with each other in the circumferential direction of the wire (the core wires 15, 15 are aligned). The upper figure is a side view, and the lower figure is a top view.

[0018] like Fig.12 and Fig.13 As shown, the distance L from the end portion 12e of the braid 12 to the internal terminal 20 is set to be constant. In order to improve the transmission performance, it is important to minimize the actual length (wire length) of the core wires 15, 15. Therefore, it is desirable to extend the exposed core wires 15, 15 as straight as possible to minimize the wire length.

[0019] like Fig.12 As shown, the arrangement of the two core wires 15, 15 that are not twisted and extend in a straight line may be different at the position of the end portion 12e of the braid 12 and the position of the connection portion with the internal terminal 20. In this case, the core wire 15 is not completely untwisted and is no longer straight, resulting in an excessive length of the exposed core wire 15.

[0020] In addition, when the braid crimping piece 202b of the external terminal 202 is crimped to the braid 12, the external force N generated by the crimping is applied to the two core wires 15, 15, so the alignment position of the two core wires 15, 15 may change, which may cause the two core wires 15, 15 to be misaligned in the length direction. When the two core wires 15, 15 have an excessively long length or are misaligned in the longitudinal direction, the transmission performance may be reduced accordingly.

[0021] Therefore, if Fig.13 As shown, it is desirable that the arrangement of the two core wires 15 , 15 that are not twisted and extend linearly at the position of the end portion 12 e of the braid 12 and the position of the connection portion with the internal terminal 20 matches (no twist).

[0022] However, in reality, as described above, since the arrangement of the internal core wires 15, 15 when hidden by the braid (shielding material) 12 cannot be known from the outside, depending on the manner in which the terminal processing process is performed, the arrangement of the core wires 15, 15 exposed from the braid (shielding material) 12 cannot be aligned at both ends (the position of the end portion 12e of the braid 12 and the position of the connection portion with the internal terminal 20).

[0023] The above problems are not limited to the use of Fig.11 In the case of the sleeve 13 shown, the above problem also occurs when the folded portion 12a of the braid 12 is directly covered by the end portion of the sheath 11 without using the sleeve 13 and the braid crimping piece 202b of the external terminal 202 is crimped to this portion.

[0024] The present invention has been proposed in view of the above situation. An object of the present invention is to provide a core wire position detection device for terminal processing of shielded electric wires, which device can align the arrangement of the core wire exposed from the shielding material at the base end and the front end, thereby improving the linearity and dimensional accuracy of the core wire exposed from the shielding material, thereby helping to improve the transmission characteristics of the terminal processing unit. An object of the present invention is also to provide a terminal processing method for shielded electric wires using the core wire position detection device.

[0025] Solution to the problem

[0026] In order to achieve the above-mentioned object, a core wire position detection device according to the present invention has the following features.

[0027] A core wire position detection device for detecting the mutual positional relationship in the wire cross section of two core wires inside a shielding material covered by a sheath made of insulating resin during terminal processing of a shielded wire, in which the two core wires are spirally twisted and arranged inside the shielding material, the core wire position detection device comprising:

[0028] a close contact unit configured to bring the shielding material into close contact with the core wire over the entire circumference at a predetermined position away from the front end of the wire by a predetermined length toward the base end side of the shielding material, the shielding material being exposed by stripping the sheath;

[0029] a measuring unit configured to measure a cross-sectional dimension of the shielding material in a wire diameter direction over the entire circumference at a predetermined position; and

[0030] A calculation unit is configured to calculate the arrangement of the two core wires at a predetermined position according to the measurement result of the measurement unit.

[0031] Advantageous Effects of the Invention

[0032] According to the present invention, even if the core wire is hidden by the shielding material, the arrangement of the core wire inside the shielding material can be accurately detected. That is, even when the shielding material is in an expanded state, the shielding material can be brought into close contact with the core wire by squeezing the expanded portion, so that the arrangement of the core wire can be measured from the outside of the shielding material. For this reason, at the stage before the shielding material is removed to extend the core wire in a straight line, the arrangement of the core wire exposed from the shielding material can be aligned at the base end and the front end. For this reason, after the internal terminal and the external terminal are attached, the linearity and dimensional accuracy of the core wire exposed from the shielding material can be improved. Therefore, it can contribute to improving the transmission characteristics of the terminal processing unit.

[0033] The present invention has been briefly described above. Further, the details of the present invention can be clarified by reading the mode for implementing the present invention (hereinafter referred to as "embodiment") which will be described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a side view showing a schematic configuration of a core wire position detection device according to a first embodiment of the present invention.

[0035] Figure 2 is a side view showing a state in which the opening and closing claws are closed and the shielding material is in close contact with the core wire in the device according to the first embodiment.

[0036] Figure 3 : is a graph showing data changes when the arrangement of two core materials hidden inside the shielding material is measured over the entire circumference in the circumferential direction of the wire from the outside of the shielding material in close contact with the core wire in the device according to the first embodiment.

[0037] Figure 4 : is a side view showing the relationship between the position of the sleeve and the measurement position A when the terminal processing of the shielded electric wire is performed using the measurement result in the apparatus according to the first embodiment.

[0038] Figure 5 An example is shown in which the shielding material is in close contact with the core wire except for the opening and closing claws.

[0039] Figure 6 An example of optical measurement of the core material arrangement in the device according to the first embodiment is shown.

[0040] Figure 7 A schematic configuration of a core wire position detection device according to a second embodiment of the present invention is shown, wherein the left figure is a side view and the right figure is a cross-sectional view taken along line MM in the side view.

[0041] Figure 8 A modification of the core wire position detection device according to the second embodiment of the present invention is shown.

[0042] Fig. 9 A schematic configuration of a core wire position detection device according to a third embodiment of the present invention is shown, wherein the left figure is a side view and the right figure is a cross-sectional view taken along line MM in the side view.

[0043] Fig.10 The state of the device according to the third embodiment during operation is shown, wherein the left figure is a side view and the right figure is a cross-sectional view taken along the line MM in the side view.

[0044] Fig.11 is a schematic perspective view showing a shielded connector in the prior art.

[0045] Fig.12 The relationship between the braid (shielding material), two core wires and the internal terminal is schematically shown, and the two core wires exposed from the braid are arranged differently at the base end and the front end, where the upper figure is a side view and the lower figure is a top view.

[0046] Fig.13 The relationship between the braid (shielding material), two core wires and the internal terminal is schematically shown, and the two core wires exposed from the braid are aligned at the base end and the front end, where the upper figure is a side view and the lower figure is a top view. DETAILED DESCRIPTION

[0047] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0048] Figure 1 is a side view showing a schematic configuration of a core wire position detection device according to a first embodiment of the present invention, Figure 2 It is a side view showing a state in which the opening and closing claws are closed and the shielding material is in close contact with the core wire.

[0049] First, if Figure 1 As shown, in the shielded electric wire 10 as the target, a braid (shielding material) 12 is provided in a sheath 11 made of resin at the outermost periphery, and two core wires 15, 15 are twisted together spirally and provided in the braid 12. If necessary, a shielding foil (aluminum foil or copper foil) may also be provided between the core wires 15, 15 and the braid 12.

[0050] The terminal processing method of the device using this embodiment is to use a tubular sleeve 13 (see Figure 4 ) Example of extruded braid 12.

[0051] During the terminal processing of the shielded wire 10, the core wire position detection device detects the relative position relationship of the two core wires 15, 15 hidden in the braid 12 covered by the sheath 11 made of insulating resin in the cross section of the wire. In the shielded wire 10, the two core wires 15, 15 are spirally twisted and arranged in the braid (shielding material 12).

[0052] The configuration includes: a unit for making the braid 12 in close contact with the core wire over the entire circumference at position A, which is away from the front end of the wire by a predetermined length toward the base end side of the braid 12, and the braid 12 is exposed by stripping the sheath 11; a unit for measuring the cross-sectional dimensions of the shielding material in the diameter direction of the wire over the entire circumference at position A; and a unit for calculating the arrangement of the two core wires 15 at position A based on the measurement results of these units.

[0053] like Figure 1 and Figure 2 As shown, the core wire position detection device according to the first embodiment includes an opening and closing claw 102 as a unit that makes the braid (shielding material) 12 in close contact with the core wire 15 over the entire circumference, and the opening and closing claw 102 can rotate around the axis of the shielded wire 10, and when closed, the braid 12 is in close contact with the core wire 15. A pair of opening and closing claws 102 separated by 180° in the circumferential direction are provided in the opening and closing mechanism 100, and are driven to open and close by an opening and closing drive mechanism (not shown). In addition, the opening and closing mechanism 100 is provided with a wire front end guide 101, which aligns the central axis and the front-to-back direction of the shielded wire 10 by abutting against the front end of the shielded wire 10.

[0054] When rotating around the axis of the shielded electric wire 10, the opening and closing claws 102 open and close over the entire circumference of the braid 12 to bring the braid 12 into close contact with the core wire 15. After the braid 12 is in close contact with the core wire 15 over the entire circumference, the measuring unit measures the cross-sectional dimensions of the braid 12 in the wire diameter direction at position A, and the calculating unit calculates the arrangement of the two core wires 15 at position A based on the measurement result.

[0055] The measuring unit for measuring the cross-sectional dimension of the braid 12 in the wire diameter direction at the position A over the entire circumference is not limited to the contact type and the non-contact type. As an example, a non-contact optical measuring unit is used here, which measures the cross-sectional dimension of the braid 12 in the wire diameter direction based on optical data obtained when the braid 12 is observed from the side.

[0056] Specifically, Figure 6As shown, the non-contact optical measuring unit includes a light emitting unit 103a, a light receiving unit 103b, a laser measuring instrument 103, and a computing unit. The light emitting unit 103a irradiates laser light to the braid 12 from the side, the light receiving unit 103b receives the laser light emitted from the light emitting unit 103a and passing through the braid 12, the laser measuring instrument 103 outputs the width dimension of the shadow portion caused by the presence of the braid 12 in the data of the light receiving unit 103b as measurement data, and the computing unit is used to determine the position where the measurement data (width dimension) becomes the smallest with the arrangement (arrangement direction) of the two core wires 15.

[0057] Figure 3 1 is a data graph showing the relationship between the interval between the opening and closing claws (the width dimension of the braid) and the rotation angle position. As can be seen from the graph, the angle position at which the width dimension of the braid 12 is the smallest represents the arrangement direction of the two core wires 15. If the two core wires 15 are not distinguished, the minimum width dimension can be obtained every 180°, but in actual terminal processing, it is necessary to distinguish the two core wires 15 and set the rotation angle of the shielded wire 10.

[0058] In addition to the laser measuring unit, the width dimension of the braid 12 may also be measured based on image data captured by a camera, and the arrangement (arrangement direction) of the two core wires 15 may be obtained from the measurement result.

[0059] The following will describe a measurement method using the apparatus of this embodiment. First, the sheath 11 of the shielded wire 10 is stripped. That is, as described above, starting from position A toward the base end side of the shielded wire 10, the sheath 11 on the front end side is stripped from the position set on the base end side to the sleeve 13 (see FIG. 1 ) mounted on the outer periphery of the braid 12. Figure 4 )’s length in the axial direction.

[0060] Next, the front end of the shielded wire 10 is brought into contact with the wire front end guide 101 so that the central axis and the front-back position are aligned. In this state, the opening and closing claws 102 are closed to squeeze the expanded part of the braid (shielding material) 12 of the shielded wire 10. In this case, the core wire 15 therein is squeezed with a pressure that the core wire 15 does not move. As a result, the braid 12 that is easy to expand is in close contact with the core wire 15 to eliminate the expansion.

[0061] The unevenness of the outer circumference of the braid 12 is measured. Next, the opening and closing claws 102 (or the shielded electric wire 10) are rotated to move the position where the braid 12 is pressed, and then the entire circumference is pressed. In addition, the unevenness of the braid 12 is measured by a contact measuring unit or a non-contact measuring unit for one circumference of the outer circumference of the electric wire.

[0062] By measuring in this way, Figure 3As shown, the variation of the cross-sectional dimensions of the braid 12 in the wire diameter direction over one circumference is known. Therefore, based on this data, the arrangement of the two core wires 15 in the wire cross section at position A can be calculated from the outside of the exposed braid 12.

[0063] When the arrangement of the two core wires 15 in the wire cross section at the position A obtained as described above is known, the measurement result is used to advance the subsequent terminal processing. That is, first, the shielded wire 10 is rotated about its axis so that the arrangement of the two core wires 15 becomes a predetermined reference angle position (e.g., a horizontal angle position).

[0064] Next, if Figure 4 As shown, the sleeve 13 is installed on the outer periphery of the exposed braid 12, and the sleeve 13 is simultaneously located on the base end side of the exposed braid 12. At this time, the position of the sleeve 13 is determined and fixed so that the position of the end portion of the sleeve 13 on the front end side of the wire coincides with position A.

[0065] The exposed braid 12 is then trimmed to a predetermined length, and the trimmed braid 12 is folded back toward the base end side of the wire at the position of the end portion of the sleeve 13, as shown in FIG. Figure 6 As shown, the outer periphery of the sleeve 13 is covered with a folded portion 12a.

[0066] Thereafter, the two core wires 15 exposed by trimming and folding back the braid 12 are untwisted at the reference angle position and extended in a straight line, and the insulating sheaths at the front ends of the two extended core wires 15 are removed to connect the internal terminals 20 (see Fig.11 ) is fixed to the exposed core conductor.

[0067] After the inner terminal 20 is fixed, the braid crimping piece (shielding material crimping piece) 202b of the outer terminal 202 (see Fig.11 ) is crimped and fixed to the folded back portion 12a of the braid 12, which is folded back to cover the sleeve 13. Thereafter, by following the above reference Figure 3 By completing the assembly process in the described order, the terminal of the shielded electric wire 10 to which the shielded connector is fixed can be obtained.

[0068] As described above, according to the first embodiment, even when the two core wires 15 are hidden by the braid 12, the arrangement of the two core wires 15 within the braid 12 can be accurately detected. That is, even when the braid 12 is in an expanded state (or even when there are wrinkles or offsets), the arrangement of the two core wires 15 can be measured from the outside of the braid 12 by squeezing the expanded portion with the opening and closing claws 102 so that the braid 12 is in close contact with the core wires 15. For this reason, at the stage before removing the braid 12 to extend the core wires 15 in a straight line, the arrangement of the core wires exposed from the braid 12 can be aligned at the base end and the front end. For this reason, after the internal terminal 20 and the external terminal 202 are attached, the linearity and dimensional accuracy of the core wires 15 exposed from the braid 12 can be improved. Therefore, it can help to improve the transmission characteristics of the terminal processing unit.

[0069] When the rotation direction of the wire after being clamped by the opening and closing claws 102 is the direction in which the twist of the core wire 15 becomes tighter, the influence of the expansion (untwisting) of the core wire can be eliminated in the measurement. In addition, when the strength of the opening and closing claws 102 to clamp the wire increases, the bending of the core wire 15 can also be corrected.

[0070] Figure 7 1 shows a schematic configuration of a core wire position detection device according to a second embodiment of the present invention, wherein the left figure is a side view and the right figure is a cross-sectional view taken along line MM in the side view. Figure 8 A variation of the core wire position detection device is shown.

[0071] In the core wire position detection device 120 according to the second embodiment, as a unit for making the braid 12 in close contact with the core wire 15 over the entire circumference, a pressure roller mechanism 125A is provided, which rotates the roller 126 around the entire circumference of the braid 12 around the axis of the shielded wire 10 while pressing the roller 126 against the outer periphery of the braid 12, thereby making the braid 12 in close contact with the core wire 15. The pressure roller mechanism 125A is also used as a measuring instrument for measuring the cross-sectional dimensions of the braid 12, and incorporates a telescopic measuring unit having the roller 126 as a contact member. That is, in the present embodiment, a contact measuring unit is provided, which measures the cross-sectional dimensions of the braid 12 in the wire diameter direction by measuring the displacement of the contact member (roller 126) in contact with the outer periphery of the braid 12 at position A. In addition, a wire core anti-deflection guide 122 using two rollers is provided.

[0072] The pressing roller mechanism 125A and the wire core deflection prevention guide 122 are arranged at positions facing each other, the wire is interposed between the pressing roller mechanism 125A and the wire core deflection prevention guide 122, and the roller 126 as a contact member is pressed against the braid 12 with an appropriate force by cylinders 127, 123 respectively. The braid 12 is clamped by the roller 126 rotating around the wire, and the diameter of the wire at each angle can be measured by rotating the wire or the roller 126.

[0073] During the measurement, the sheath 11 is first stripped from the shielded wire 10. The stripping dimension is the same as that of the first embodiment. Next, the front end of the shielded wire 10 is brought into contact with the wire front end guide 121 to align the center axis and the front-back position. By this positioning, the position A and the position of the roller 126 coincide with each other.

[0074] Then, the roller of the electric wire core deflection prevention guide 122 and the roller 126 of the pressing roller mechanism 125A (also used as a measuring instrument) are pressed against the outer periphery of the braid 12 by the cylinders 123, 127. The pressure at this time is a pressure that prevents the core wire 15 therein from moving.

[0075] In this state, when the roller mechanism 125A and the wire core deflection prevention guide 122 on the shielded wire 10 side or the core wire position detection device 120 side rotate, the wire core deflection prevention guide 122 moves back and forth in the radial direction of the wire according to the unevenness of the core wire 15 therein, and the cylinder 123 also moves back and forth. The cylinder 127 on the roller mechanism 125A side presses the roller 126 against the braid 12 and then fixes the position during measurement. In this way, the roller 126, which also serves as a contact member of the contact measuring instrument, changes according to the unevenness of the braid 12, the measuring unit incorporated in the roller mechanism 125A expands and contracts according to the unevenness of the braid 12, and the data of the cross-sectional size of the braid 12 is obtained. In this state, when the shielded electric wire 10 or the pressing roller mechanism 125A rotates, the roller 126 is displaced according to the unevenness of the internal core wire 15, and the measuring unit measures the expansion and contraction length, thereby measuring the cross-sectional size of the braid 12 over the entire circumference, and the arrangement of the two core wires 15 is determined based on the measurement.

[0076] The method of performing terminal processing on the shielded electric wire using the obtained arrangement data of the core wire 15 is the same as that of the first embodiment.

[0077] Instead of incorporating a contact type measuring unit into the roller mechanism 125A, as Figure 8 As shown, a pressing member 128 pressed against the braid 12 by a spring may be provided, and the displacement of the pressing member 128 is measured by a non-contact laser sensor 125B or the like.

[0078] Fig. 9A schematic configuration of a core wire position detection device according to a third embodiment of the present invention is shown, wherein the left figure is a side view and the right figure is a cross-sectional view taken along line MM in the side view. Fig.10 The state of the device during operation is shown, wherein the left figure is a side view and the right figure is a cross-sectional view taken along the line MM in the side view.

[0079] In addition to the opening and closing mechanism 100 having the opening and closing jaws 102 of the first embodiment, the core wire position detection device of the third embodiment includes a measuring instrument 108 (e.g., a contact sensor) that measures the displacement amount of the opening and closing jaws 102 in the extrusion direction relative to the braid 12. When the opening and closing jaws 102 are closed and the braid 12 is in close contact with the core wire 15, the measuring instrument 108 measures the opening degree of the opening and closing jaws 102 over the entire circumference, thereby measuring the cross-sectional size of the braid 12 and determining the arrangement of the two core wires 15.

[0080] During the measurement, the sheath 11 is first stripped from the shielded wire 10. The stripping dimensions are the same as those of the first embodiment. Next, the front end of the shielded wire 10 is brought into contact with the wire front end guide 121 to align the center axis and the front-rear position. By this positioning, the position A and the position of the roller 126 coincide with each other.

[0081] In this state, the opening and closing claws 102 are closed to squeeze the expanded portion of the braid (shielding material) 12 of the shielded electric wire 10. In this case, the core wire 15 therein is pressed at a pressure at which the core wire 15 does not move. As a result, the braid 12, which is easy to expand, is in close contact with the core wire 15 to eliminate the expansion. The unevenness of the outer periphery of the braid 12 is measured by a measuring instrument 108, which is interlocked with the opening and closing operation of the opening and closing claws 102. That is, the interval (opening) of the opening and closing claws 102 at the stop position of the opening and closing claws 102 is measured.

[0082] Then, the opening and closing claws 102 are opened, and the opening and closing claws 102 or the shielded electric wire 10 are rotated to provide an angle difference between them. The position where the braid 12 is squeezed is moved, and the opening degree of the opening and closing claws 102 is measured. By repeating the above operation over the entire circumference, the interval of the opening and closing claws 102 at the angle difference between the shielded electric wire 10 and the opening and closing claws 102 is measured to be 90 degrees or more. Thus, the cross-sectional dimensions of the braid 12 can be measured, and the arrangement of the two core wires 15 can be determined based on the measured cross-sectional dimensions.

[0083] The method of performing terminal processing on the shielded electric wire using the obtained arrangement data of the core wire 15 is the same as that of the first embodiment.

[0084] In the above-described embodiment, the braid is exemplified as the shielding material, but the present invention can also be applied to a shielded electric wire using a shielding material other than the braid (eg, a shielding foil).

[0085] The core wire position detection devices according to the second and third embodiments described above can achieve the same effects as those of the first embodiment.

[0086] Here, the core wire position detection device and the terminal processing method according to the above-mentioned embodiments of the present invention are briefly summarized and listed in the following [1] to [6].

[0087] [1] A core wire position detection device for detecting the relative positional relationship of two core wires (15) in a shielding material (12) covered by a sheath (10) made of insulating resin in a cross section of a shielded wire (10) during terminal processing of the shielded wire (10), wherein the two core wires (15) are spirally twisted and arranged in the shielding material (12), the core wire position detection device comprising:

[0088] A close contact unit configured to bring the shielding material (12) into close contact with the core wire (15) over the entire circumference at a predetermined position, the predetermined position being away from the front end of the wire by a predetermined length toward the base end of the shielding material (12), the shielding material (12) being exposed by stripping off the sheath (11);

[0089] a measuring unit configured to measure a cross-sectional dimension of the shielding material (12) in a wire diameter direction at a position A over the entire circumference; and

[0090] A calculation unit is configured to calculate the arrangement of the two core wires (15) at the position A according to the measurement result of the measurement unit.

[0091] According to the configuration of [1], even when the two core wires (15) are hidden by the shielding material (12), the arrangement of the two core wires (15) within the shielding material (12) can be accurately detected. That is, even when the shielding material (12) is in an expanded state (or even when there are wrinkles or offsets), the arrangement of the two core wires (15) can be measured from the outside of the shielding material (12) by squeezing the expanded portion to bring the shielding material (12) into close contact with the core wires (15). For this reason, at a stage before removing the shielding material (12) to extend the core wire (15) in a straight line, the arrangement of the core wire (15) exposed from the shielding material (12) can be aligned at the base end and the front end. For this reason, after the internal terminal (20) and the external terminal (202) are attached, the linearity and dimensional accuracy of the core wire (15) exposed from the shielding material (12) can be improved. Therefore, it can contribute to improving the transmission characteristics of the terminal processing unit.

[0092] [2] The core wire position detection device according to [1], wherein

[0093] The close contact unit includes an opening and closing claw (102) which is rotatable about the axis of the shielded electric wire (10) and is configured to bring the shielding material (12) into close contact with the core wire (15) when closed.

[0094] According to the configuration of [2], since the opening and closing claws (102) bring the shielding material (12) into close contact with the core wire (15), the structure is simple and easy to implement.

[0095] [3] The core wire position detection device according to [1], wherein

[0096] The close contact unit includes a pressing roller mechanism (125A), which is configured to make the shielding material (12) and the core wire (15) closely contact by rotating a roller (126) rotatable around the axis of the shielded wire (10) over the entire circumference of the shielding material (12) while pressing the roller (126) against the outer periphery of the shielding material (12).

[0097] According to the configuration of [3], since the roller (126) is pressed to bring the shielding material (12) into close contact with the core wire (15), the roller (126) can be continuously pressed against the outer periphery of the braid (12) in the circumferential direction.

[0098] [4] The core wire position detection device according to [1], wherein

[0099] The measuring unit includes an optical measuring unit (103) configured to measure a cross-sectional dimension of the shielding material (12) in a wire diameter direction based on optical data when the shielding material (12) is observed from the side.

[0100] According to the configuration of [4], the arrangement of the core wire (15) can be detected in a non-contact manner by the optical measuring unit (103).

[0101] [5] The core wire position detection device according to [1], wherein

[0102] The measuring unit is configured to measure the cross-sectional dimension of the shielding material (12) in the direction of the wire diameter over the entire circumference at a predetermined position (A), and the measuring unit includes a unit configured to measure the cross-sectional dimension of the shielding material (12) in the direction of the wire diameter by measuring the displacement of a contact piece (126) in contact with the outer circumference of the shielding material (12) at the predetermined position (A).

[0103] According to the configuration of [5], the arrangement of the core wire (15) can be calculated by measuring the displacement amount of the contact member (eg, roller 126).

[0104] [6] A terminal processing method for a shielded electric wire, the terminal processing method comprising:

[0105] a stripping step of stripping the sheath on the front end from a position set on the base end by a length in the axial direction of a sleeve mounted on the outer periphery of the shielding material from a predetermined position (A);

[0106] a calculation step of calculating the arrangement of the two core wires in the electric wire cross section at a predetermined position (A) from the outside of the exposed shielding material by the core wire position detection device according to [1];

[0107] a rotating step of rotating the shielded electric wire about the axis so that the arrangement of the plurality of core wires in the electric wire cross section at the predetermined position (A) obtained by the calculating step becomes a predetermined reference angular position;

[0108] a sleeve fixing step of fixing the sleeve to the outer periphery of the shielding material exposed by stripping the sheath, while positioning the sleeve on the base end side of the exposed shielding material, and fixing the sleeve so that the position of the end portion of the sleeve on the front end side of the electric wire coincides with a predetermined position;

[0109] A folding back step, trimming the exposed shielding material to a predetermined length, folding the trimmed shielding material back toward the base end of the wire at the end portion of the sleeve, and covering the outer periphery of the sleeve with the folded back portion;

[0110] An extending step of untwisting the plurality of core wires exposed by trimming and folding back the shielding material in the folding back step, and extending the core wires in a straight line at a reference angle position;

[0111] a fixing step of removing the insulating sheaths at the front ends of the plurality of core wires linearly extended at the reference angle position in the extending step, and fixing an internal terminal to each of the exposed core wire conductors; and

[0112] The crimping step crimps and fixes the shield material crimping piece of the external terminal to the folded-back portion of the shield material folded back to cover the sleeve.

[0113] According to the terminal processing method having the configuration of [6], the arrangement of the core wire (15) exposed from the shielding material (12) can be aligned from the base end to the front end of the exposed portion. Therefore, the core wire (15) of the exposed portion can extend linearly from the base end to the front end, and as a result, the excess length of the exposed portion of the core wire (15) can be reduced. The front end of the exposed core wire (15) can be processed in a state where the length of the core wire (15) is aligned, and the transmission characteristics of the shielded connector can be improved.

[0114] The present invention is not limited to the above-mentioned embodiments, and modifications, improvements, etc. may be made as appropriate. In addition, as long as the present invention can be realized, the materials, shapes, sizes, quantities, arrangement positions, etc. of the components in the above-mentioned embodiments may be freely selected without limitation.

[0115] For example, Figure 5 As shown, a pair of rods are tied together with a rope, etc., and the shielding material can be tied with a rope at the same position as the position where the shielding material and the core wire are in close contact with each other in the above-mentioned embodiments. In this case, the rod can be operated by an automatic machine, but the rod can also be operated by an operator.

[0116] This application is based on the Japanese patent application (No. 2022-195799) filed on December 7, 2022, the contents of which are incorporated herein by reference.

[0117] Reference numerals list

[0118] 1 Outer periphery of the wire

[0119] 10 Shielded wire

[0120] 11. Sheath

[0121] 12 Braid (shielding material)

[0122] 12 Shielding Materials

[0123] 13 Sleeve

[0124] 15 core wire

[0125] 15a Core conductor

[0126] 15b Insulation sheath

[0127] 20 Internal terminals

[0128] 100 Opening and closing mechanism

[0129] 101 Wire front guide

[0130] 102 Opening and closing claws

[0131] 103 Laser measuring instrument

[0132] 103a Light emitting unit

[0133] 103b Light receiving unit

[0134] 120 Core wire position detection device

[0135] 121 Wire front guide

[0136] 122 Wire core anti-deflection guide

[0137] 123 Cylinder

[0138] 125a Roller mechanism

[0139] 125b Laser Sensor

[0140] 126 Roller

[0141] 127 Cylinder

[0142] 128 Components

[0143] 200 Shielded Connector

[0144] 200a Internal module

[0145] 201 External shell

[0146] 202 external terminal (shielding shell)

[0147] 202a Shell accommodating portion

[0148] 202b braid crimping parts (shielding material crimping parts)

[0149] 203 Inner shell

[0150] 203a Terminal receiving hole

[0151] 202c Jacket Crimp

[0152] 204: impedance adjustment component.

Claims

1. A core wire position detection device for detecting the relative positional relationship of two core wires inside a shielding material covered by a sheath made of insulating resin in a cross section of a shielded wire during terminal processing of the shielded wire, wherein the two core wires are spirally twisted and arranged inside the shielding material, the core wire position detection device comprising: a close contact unit configured to bring the shielding material into close contact with the core wire over the entire circumference at a predetermined position, the predetermined position being away from the front end of the wire by a predetermined length toward the base end of the shielding material, the shielding material being exposed by stripping off the sheath; a measuring unit configured to measure a cross-sectional dimension of the shielding material in a wire diameter direction over the entire circumference at the predetermined position; as well as A calculation unit is configured to calculate the arrangement of the two core wires at the predetermined position according to the measurement result of the measurement unit.

2. The core wire position detection device according to claim 1, wherein The close contact unit includes an opening and closing claw that is rotatable about an axis of the shielded electric wire and is configured to bring the shielding material into close contact with the core wire when closed.

3. The core wire position detection device according to claim 1, wherein The close contact unit includes a pressing roller mechanism configured to bring the shielding material into close contact with the core wire by rotating a roller rotatable about an axis of the shielded electric wire over an entire circumference of the shielding material while pressing the roller against an outer periphery of the shielding material.

4. The core wire position detection device according to claim 1, wherein The measuring unit includes an optical measuring unit configured to measure the cross-sectional dimension of the shielding material in the electric wire diameter direction based on optical data when the shielding material is observed from the side.

5. The core wire position detection device according to claim 1, wherein The measuring unit configured to measure the cross-sectional dimension of the shielding material in the direction of the diameter of the wire over the entire circumference at the predetermined position includes a unit configured to measure the cross-sectional dimension of the shielding material in the direction of the diameter of the wire by measuring the displacement of a contact piece in contact with the outer periphery of the shielding material at the predetermined position.

6. A terminal processing method for a shielded electric wire, the terminal processing method comprising: a stripping step of stripping the sheath on the front end from a position set on the base end by a length in the axial direction from a predetermined position to a sleeve mounted on the outer periphery of the shielding material; a calculation step of calculating the arrangement of the two core wires in the cross section of the wire at the predetermined position from the outside of the exposed shielding material by using the core wire position detection device according to claim 1; a rotating step of rotating the shielded electric wire around the axis so that the arrangement of the plurality of core wires at the predetermined position obtained by the calculating step in the cross section of the electric wire becomes a predetermined reference angular position; a sleeve fixing step of installing the sleeve on the outer periphery of the shielding material exposed by stripping the sheath, positioning the sleeve on the base end side of the exposed shielding material, and fixing the sleeve so that the position of the end portion of the sleeve on the front end side of the electric wire coincides with the predetermined position; a folding back step of trimming the exposed shielding material to a predetermined length, folding the trimmed shielding material back toward the base end side of the wire at the end portion of the sleeve, and covering the outer periphery of the sleeve with the folded back portion; an extending step of untwisting the plurality of core wires exposed by trimming and folding back the shielding material in the folding back step, and extending the core wires in a straight line at the reference angle position; a fixing step of removing the insulating sheaths at the front ends of the plurality of core wires extending linearly at the reference angle position in the extending step, and fixing an internal terminal to each exposed core wire conductor; as well as A crimping step of crimping and fixing a crimping piece of the shielding material of the external terminal to the folded-back portion of the shielding material folded back to cover the sleeve.

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