Slitting device for peeling and slitting method for peeling

Abstract

To provide a slitting device and slitting method for peeling that can improve the slitting accuracy when the target is a thick wire or a covered wire wound around a bobbin and stored.SOLUTION: A cut mechanism 11 of a slitting device 1 for peeling includes a conductive cutter blade 111, a contact detection unit 113 that detects contact between an outermost conductor and the cutter blade 111 on the basis of variable electrostatic capacity between the outermost conductor and the cutter blade 111 in a covered wire, and a moving mechanism 112 that adjusts the position of the cutter blade 111 and positions it to make the cut at the specified cutting depth when contact with the outermost conductor is detected by a contact detection unit 113 during movement of the cutter blade 111.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cutting device and a cutting method for stripping a coated electric wire, which cuts an incision from the outer surface to strip the insulated electric wire. [Background technology]

[0002] Conventionally, as one of the end treatments for covered electric wires, a stripping process is widely performed in which the covering is removed to expose the conductor such as the core wire inside. For this stripping process, a stripping incision device is known that can remove the stripped portion by making an incision from the outer circumferential surface of the covered electric wire (see, for example, Patent Document 1). In the type of stripping incision device described in Patent Document 1, a pair of V-shaped cutter blades that clamp the covered electric wire so as to bite into the outer circumferential surface are rotated around the axis of the electric wire to form an incision for stripping. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-350324 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, the insulated electric wire includes a thick electric wire having a core wire and a plurality of layers of coating materials, such as an inner coating, a braid, a metal foil, and an outer coating, laminated thereon. In the above-mentioned type of stripping incision device, in many cases, the reference for the movement of the V-shaped cutter blade when clamping the insulated electric wire is set to the electric wire axis, and the position of the movement destination of the V-shaped cutter blade is specified as the distance from the electric wire axis. Then, the V-shaped cutter blade is moved toward the electric wire axis so as to bite into the insulated electric wire with a cutting depth according to the specified movement destination, and clamps the insulated electric wire. For example, when the above-mentioned thick electric wire is to be incised, the position of the movement destination of the V-shaped cutter blade is specified as the distance from the electric wire axis obtained by subtracting the thickness of the coating material to be stripped from the radius of the core wire and the sum of the thicknesses of the plurality of layers of coating materials. In this case, for thick electric wires, the tolerance of the position of the V-shaped cutter blade relative to the electric wire axis tends to be large because it is the cumulative tolerance of the core wire radius tolerance and the thickness tolerance of the coating material other than the target to be stripped. As a result, the movement accuracy of the V-shaped cutter blade is low. For example, when trying to cut into the desired coating material of the above-mentioned thick electric wire, the low movement accuracy of the V-shaped cutter blade may cause the cut to be too deep, cutting into the coating material that should be left inside. Or, the cut may be too shallow, and not enough cut for stripping.

[0005] In addition, many insulated electric wires are stored wound on bobbins, and during storage, the core wire and the coating may become deformed and flattened due to the load caused by their own weight, or the wire axis may become eccentric and shift from the center of the insulated electric wire. When cutting such a deformed or eccentric insulated electric wire with the above-mentioned type of stripping incision device, when the pair of V-shaped cutter blades are rotated around the axis of the electric wire, the cutting depth of the V-shaped cutter blades varies around the axis of the electric wire. As a result, the incision may be too deep in some places around the axis of the electric wire, cutting into the inside part that should be left, and conversely, may be too shallow in other places, resulting in insufficient cutting.

[0006] In this way, the above-mentioned type of peeling and cutting device, in which a pair of V-shaped cutter blades that clamp the insulated electric wire are rotated around the axis of the wire, has a problem in that the cutting accuracy decreases when cutting thick electric wires or insulated electric wires that are wound on bobbins and stored.

[0007] Therefore, the present invention focuses on the above-mentioned problems and aims to provide a peeling incision device and a peeling incision method that can improve the incision accuracy when used on thick electric wires or insulated electric wires wound on bobbins and stored. [Means for solving the problem]

[0008] In order to solve the above problems, the peeling incision device is provided with one or more mechanism parts arranged one-to-one around the axis of an insulated electric wire in which a core wire is covered with an insulating layer or the core wire is covered with the insulating layer and one or more conductor layers laminated inside the insulating layer, and the device is equipped with a cutting mechanism that makes an incision from an outer circumferential surface of the insulated electric wire to a specified incision depth in each of the mechanism parts, and a rotation mechanism that rotates the mechanism part with the incision made in the insulated electric wire about the axis of the wire to extend the incision about the axis of the wire, thereby making it possible to remove a peeled portion according to the incision depth, and the cutting mechanism is arranged to rotate the insulated electric wire about the axis of the wire to extend the incision about the axis of the wire, the cutter blade is configured to move in a cross direction relative to the outer conductor of the insulated electric wire; a contact detection unit that detects contact between the outermost conductor and the cutter blade based on a variable capacitance between the cutter blade and an outermost conductor that is shallowest from the outer circumferential surface of the insulated electric wire, the value of which changes in response to movement of the cutter blade; and a moving mechanism that constitutes the mechanical part together with the cutter blade and moves the cutter blade in the cross direction, and that, when the contact detection unit detects the contact during movement of the cutter blade, adjusts the position of the cutter blade in the cross direction to position it in accordance with the cutting depth and makes the cut.

[0009] In addition, in order to solve the above problem, a peeling incision method includes a preparation step of using the above-mentioned peeling incision device to set the insulated electric wire in the peeling incision device and positioning the cutter blade at an initial position away from the outer peripheral surface in the cross direction; a first incision step of moving the cutter blade until the contact detection unit detects contact between the outermost conductor and the cutter blade based on the variable capacitance; a second incision step of adjusting the position of the cutter blade in the cross direction to a position corresponding to the incision depth and making the incision when the contact detection unit detects the contact during the movement of the cutter blade in the first incision step; and a rotation step of rotating the mechanism part with the incision made in the insulated electric wire about the wire axis to extend the incision about the wire axis, thereby making it possible to remove the peeled portion. Effect of the Invention

[0010] According to the above-described stripping incision device and stripping incision method, it is possible to improve the incision accuracy when a thick electric wire or a coated electric wire wound on a bobbin and stored is treated as the target. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing a peeling incision device according to one embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing a coated electric wire to be cut by the peeling and cutting device shown in FIG. 1. [Diagram 3] 3 is a cross-sectional view showing a cross section of the covered electric wire shown in FIG. 2 taken along line V11-V11 in FIG. 2. [Figure 4] 2 is a schematic side view showing a mechanical portion of the cutting mechanism shown in FIG. 1 as viewed from the cutting rotation direction. [Diagram 5] 2 is a schematic diagram showing how the contact detection unit shown in FIG. 1 detects contact of the cutter blade with the metal foil based on the variable capacitance between the metal foil and the cutter blade. FIG. [Figure 6]FIG. 7 is a schematic diagram showing the clamp portion shown in FIGS. 5 and 6. [Figure 7] FIG. 6 is a schematic circuit diagram showing a configuration for detecting contact of the cutter blade shown in FIG. 5. [Figure 8] 2 is a schematic flowchart showing a series of steps in a peeling incision method for making incisions for peeling at an end of a coated electric wire using the peeling incision device shown in FIG. 1. [Figure 9] 9 is an explanatory diagram for explaining a part of the process in the peeling incision method shown in FIG. 8, using the peripheral structure of the cutter blade in the side view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of a peeling incision device and a peeling incision method will be described.

[0013] Fig. 1 is a schematic diagram showing a peeling incision device according to one embodiment. Fig. 2 is a schematic diagram showing a covered electric wire to be incised by the peeling incision device shown in Fig. 1. Fig. 3 is a cross-sectional view showing a cross section of the covered electric wire shown in Fig. 2 taken along line V11-V11 in Fig. 2.

[0014] First, the insulated electric wire 2 to be cut in this embodiment is a thick electric wire in which a conductor core wire 21 is covered with multiple layers of coating material, and is stored wound on a bobbin and used for high-voltage wire harnesses for automobiles, etc. The coating material includes an inner coating 22 as an insulating layer made of insulating resin, a braid 23 as a conductor layer, a metal foil 24 as a conductor layer, and an outermost coating 25 as an insulating layer made of insulating resin. The stripping cutting device 1 makes a cut to a specified cutting depth from the outer circumferential surface 2a as end processing for the insulated electric wire 2, thereby making it possible to remove the peeled portion according to the cutting depth.

[0015] For example, the following types of incisions are possible. That is, one example of the incision is to specify the incision depth up to the inner circumference of the metal foil 24 so that the outermost coating 25 and the metal foil 24 are the peeled parts, and to make an incision up to the inner circumference of the metal foil 24. In this example, after peeling, the braid 23 that houses the inner coating 22 and the core wire 21 on the inside is exposed at the end of the insulated electric wire 2. Another example of the incision is to specify the incision depth up to the inner circumference of the inner coating 22 so that all coating materials other than the core wire 21 are the peeled parts, and to make an incision up to the inner circumference of the inner coating 22. In this example, after peeling, the core wire 21 is exposed at the end of the insulated electric wire 2.

[0016] The peeling incision device 1 is a device capable of making such an incision in the insulated electric wire 2, and includes three cutting mechanisms 11 and a rotating mechanism 12. The cutting mechanism 11 has a plurality of mechanism parts 11a (three in the present embodiment) arranged around the wire axis 2b of the insulated electric wire 2, and the mechanism parts 11a make an incision at a specified incision depth from the outer peripheral surface 2a of the insulated electric wire 2. In the present embodiment, the mechanism parts 11a of the three cutting mechanisms 11 are arranged at intervals of 120° around the wire axis 2b. The rotating mechanism 12 is a part that rotates the three mechanism parts 11a that have made an incision in the insulated electric wire 2 in a cutting rotation direction D11 around the wire axis 2b to extend the incision around the wire axis 2b. In the present embodiment, the rotating mechanism 12 rotates the three cutting mechanisms 11 by 120° or more in the cutting rotation direction D11 around the wire axis 2b. This rotation connects the three cuts around the wire axis 2b to complete one revolution, making it possible to remove the peeled portion according to the specified cut depth.

[0017] The three cutting mechanisms 11 in this peeling incision device 1 have the same configuration including the above-mentioned mechanism portion 11a, and the configuration of one cutting mechanism 11 will be described below.

[0018] FIG. 4 is a schematic side view showing a mechanical portion of the cutting mechanism shown in FIG. 1 as viewed from the cutting rotation direction.

[0019] 1 and 4, the cutting mechanism 11 includes a cutter blade 111 and a moving mechanism 112 constituting a mechanism portion 11a, and a contact detection unit 113 that detects contact between the cutter blade 111 and an outermost conductor that is shallowest from the outer circumferential surface 2a of the insulated electric wire 2. In this embodiment in which the insulated electric wire 2 shown in FIGS. 2 and 3 is to be cut, the outermost conductor is a metal foil 24.

[0020] The cutter blade 111 is a conductive, disk-shaped blade member movable in a direction intersecting the outer circumferential surface 2a of the insulated electric wire 2. In this embodiment, the cutter blade 111 is supported by a cutter frame 112b (described later) of the moving mechanism 112 so as to be rotatable about a cutter axis 111a intersecting the intersecting direction D12 along the electric wire axis 2b.

[0021] The moving mechanism 112 is a mechanism for moving the cutter blade 111 in the cross direction D12. When the contact detection unit 113 detects contact with the metal foil 24 during the movement of the cutter blade 111, the moving mechanism 112 adjusts the position of the cutter blade 111 in the cross direction D12 to a position according to the cutting depth, and makes a cut in the insulated electric wire 2. In this embodiment, the moving mechanism 112 has a servo motor 112a capable of precise driving as a driving source. The moving mechanism 112 also has a cutter connecting frame 112b which is moved in the cross direction D12 by the servo motor 112a and has the cutter blade 111 journaled at its tip on the insulated electric wire 2 side. The moving mechanism 112 precisely moves the cutter blade 111 via the cutter connecting frame 112b by the servo motor 112a, so that the cutter blade 111 enters the outer circumferential surface 2b of the insulated electric wire 2 to a specified cutting depth.

[0022] As described above, the contact detection unit 113 is a part that detects the contact of the cutter blade 111 with the metal foil 24. This contact detection is performed based on a variable capacitance between the metal foil 24 and the cutter blade 111, the value of which changes in response to the movement of the cutter blade 111.

[0023] Fig. 5 is a schematic diagram showing how the contact detector shown in Fig. 1 detects the contact of the cutter blade with the metal foil based on the variable capacitance between the metal foil and the cutter blade. Fig. 6 is a schematic diagram showing the clamping unit shown in Fig. 5 and Fig. 6, and Fig. 7 is a schematic circuit diagram showing the configuration for detecting the contact of the cutter blade shown in Fig. 5.

[0024] The clamping portion 13 is a conductive member that holds the insulated electric wire 2 while contacting the outer peripheral surface 2a at a clamping position P12 that is separated from the incision position P11 of the cutter blade 111 in the length direction D13 of the insulated electric wire 2. One clamping portion 13 is provided for each of the three cutting mechanisms 11, and as shown in FIG. 6, the pair of clamping portions 131, both of which are conductive, hold the insulated electric wire 2 by clamping it in the radial direction D14. Each clamping portion 131 has a V-shaped wire receiving recess 131a formed on the side facing the insulated electric wire 2. The pair of clamping portions 131 receive and hold the insulated electric wire 2 in the wire receiving recess 131a such that the inner surface of each wire receiving recess 131a contacts the outer peripheral surface 2a of the insulated electric wire 2.

[0025] The pair of clamping parts 131 constituting the clamp unit 13 and the cutter blades 111 of the three cutting mechanisms 11 are conductive as described above. One of the pair of clamping parts 131 is connected to the IN terminal 113a of the contact detection part 113 of each of the three cutting mechanisms 11, and the cutter blades 111 of each cutting mechanism 11 are connected to the OUT terminal 113b of the corresponding contact detection part 113. With such a connection, a clamp-side capacitor C1 is first formed between the clamping part 131 connected to the IN terminal 113a in the clamp unit 13 and the metal foil 24 which is the outermost conductor of the coated electric wire 2. The capacitance of the clamp-side capacitor C1 is a fixed capacitance whose value is almost constant because the distance between the clamping part 131 and the metal foil 24 does not change during clamping. On the other hand, a cutter-side capacitor C2 is formed between the cutter blade 111 and the metal foil 24, and the capacitance of the cutter-side capacitor C2 is a variable capacitance whose value changes when the distance between the clamping part 131 and the metal foil 24 changes due to the movement of the cutter blade 111. The variable capacitance becomes approximately zero when the cutter blade 111 comes into contact with the metal foil 24. In this embodiment, an electric circuit CR1 is formed by the IN terminal 113a, the OUT terminal 113b, the clamp side capacitor C1, the cutter side capacitor C2, and the metal foil 24 between the two capacitors in the contact detection unit 113. The contact detection unit 113 detects the variable capacitance of the cutter side capacitor C2 by applying an AC voltage from the IN terminal 113a and the OUT terminal 113b using the clamping unit 131 of the clamp unit 13 and the cutter blade 111 as electrodes. Then, the contact detection unit 113 detects the contact between the cutter blade 111 and the metal foil 24 based on the detection result, specifically, when the variable capacitance of the cutter side capacitor C2 becomes approximately zero.

[0026] When the contact detector 113 detects contact during the movement of the cutter blade 111, the movement mechanism 112 of each cutting mechanism 11 adjusts the position of the cutter blade 111 in the cross direction D12 to position the cutter blade 111 at a position corresponding to the designated cutting depth. That is, when the designated cutting depth is up to the metal foil 24, the movement mechanism 112 stops the movement of the cutter blade 111 at the time of contact detection. When the cutting depth is up to the braid 23, the movement mechanism 112 feeds the cutter blade 111 by the thickness of the metal foil 24 from the time of contact detection and then stops the movement of the cutter blade 111. When the cutting depth is up to the inner coating 22, the movement mechanism 112 feeds the cutter blade 111 by the total thickness of the metal foil 24 and the braid 23 from the time of contact detection and then stops the movement of the cutter blade 111. Also, when the incision depth is up to the core wire 21, the cutter blade 111 is fed from the time of contact detection by the total thickness of the metal foil 24, the braid 23, and the inner coating 22, and then the movement of the cutter blade 111 is stopped. When the incisions of the specified incision depth are made in the insulated electric wire 2 at three locations at intervals of 120° around the electric wire axis 2b in this manner, the rotation mechanism 12 then rotates the mechanism part 11a including the cutter blade 111 by 120° or more around the electric wire axis 2b. This rotation extends the above three incisions around the electric wire axis 2b and connects them to form an incision that goes around the electric wire axis 2b. This incision formation makes it possible to remove the peeled portion at the end of the insulated electric wire 2 according to the specified incision depth.

[0027] Next, the peeling incision method for making incisions for peeling at the end of the insulated electric wire 2 using the peeling incision device 1 described above will be explained below with reference to another figure, although some of the explanation will overlap with what has been explained so far.

[0028] Fig. 8 is a schematic flow chart showing a series of steps in a method for making incisions for peeling at an end of a coated electric wire using the device for peeling shown in Fig. 1. Fig. 9 is an explanatory diagram for explaining a part of the steps in the method for peeling shown in Fig. 8 by using the peripheral structure of the cutter blade in the side view of Fig. 4.

[0029] 8 starts when the insulated electric wire 2 to be cut is prepared. When the process starts, a preparation step S11 is first performed. In the preparation step S11, the insulated electric wire 2 is set in the insulated electric wire cutting device 1, and the cutter blade 111 is positioned at an initial position P13 away from the outer circumferential surface 2a in the cross direction D12 in each of the mechanism parts 11a of the three cutting mechanisms 11. At this time, the insulated electric wire 2 is set in the insulated electric wire cutting device 1 by holding the insulated electric wire 2 in the clamp part 13.

[0030] Following the preparation step S11, a first cutting step S12 is performed in which the movement mechanism 112 moves the cutter blade 111 in the cross direction D12 as follows. In this first cutting step S12, a cutter movement step S121 and a contact determination step S122 based on the variable capacitance of the cutter-side capacitor C2 are repeatedly performed. In the contact determination step S122, the contact detection unit 113 determines whether the variable capacitance of the cutter-side capacitor C2 is zero or not. If the variable capacitance is not zero (NO determination), the cutter blade 111 is not in contact with the metal foil 24, which is the outermost conductor, so the cutter movement step S121 is repeated. If the variable capacitance is zero (YES determination), the cutter blade 111 is in contact with the metal foil 24, so the process proceeds to the next second cutting step S13.

[0031] In the second cutting step S13, after the contact between the cutter blade 111 and the metal foil 24 is detected by the contact detection unit 113, the position of the cutter blade 111 in the cross direction D12 is adjusted by the movement mechanism 112. By this position adjustment, the cutter blade 111 is positioned at a position according to the specified cutting depth t11 and the cut is made. As described above, when the specified cutting depth is up to the metal foil 24, the movement of the cutter blade 111 is stopped at the time of contact detection. Also, when the cutting depth is up to the braid 23, the movement of the cutter blade 111 is stopped after the cutter blade 111 is fed out by the thickness of the metal foil 24 from the time of contact detection. In the second cutting step S13, such a position adjustment of the cutter blade 111 is performed after the contact detection between the cutter blade 111 and the metal foil 24, and the cut is made.

[0032] When the second incision step S13 is performed for each of the three cutting mechanisms 11, the incision is finally extended by the rotation step S14. In this rotation step S14, the mechanism parts 11a of the three cutting mechanisms 11, which have made an incision in the insulated electric wire 2, are rotated by the rotation mechanism 12 by 120° or more around the electric wire axis 2b. This rotation extends the three incisions around the electric wire axis 2b and connects them to each other, and a incision is formed around the electric wire axis 2b at the end of the insulated electric wire 2. This incision formation around the entire circumference makes it possible to remove the peeled portion according to the specified incision depth t11, and this completes the series of processes of the incision method for peeling. After this, the removable peeled portion is removed, and the inside is exposed. The removal of the peeled portion may be performed manually by an operator, or may be performed using a dedicated removal device.

[0033] The peeling incision device 1 and the peeling incision method according to the embodiment described above can achieve the following effects. That is, in this embodiment, when the cutter blade 111 makes an incision for peeling, the contact between the metal foil 24 and the cutter blade 111 is detected based on the variable capacitance of the cutter-side capacitor C2 between the metal foil 24 (outermost conductor) and the cutter blade 111. Then, after the detection, the position of the cutter blade 111 is adjusted to a position according to the specified incision depth t11, and an incision of the incision depth t11 is made. According to this configuration, the position where the cutter blade 111 actually comes into contact with the metal foil 24 of the insulated electric wire 2 becomes the reference for the subsequent feeding of the cutter blade 111. By setting such a feeding reference, even in the case of a thick electric wire, the influence of the stacking tolerance regarding the thickness of each insulated material can be suppressed, and the incision accuracy can be improved. Furthermore, even when the covered electric wire 2 is deformed or eccentric due to being wound around a bobbin and stored, the cutter blade 111 is actually brought into contact with the metal foil 24 before being unwound, so that the influence of deformation or eccentricity can be suppressed and the incision accuracy can be improved. Thus, according to this embodiment, the incision accuracy can be improved when a thick electric wire or a covered electric wire 2 wound around a bobbin and stored is targeted. Furthermore, according to this embodiment, when a thick electric wire is targeted, a wide incision can be made up to the desired coating material without changing the device structure by appropriately setting the designation of the incision depth t11.

[0034] In this embodiment, a conductive clamp unit 13 is provided that holds the insulated electric wire 2 at a clamp position P12 away from the incision position P11 of the cutter blade 111. The contact detection unit 113 detects the variable capacitance by applying a voltage to an electric circuit CR1 including the fixed capacitance of the clamp side capacitor C1, the variable capacitance of the cutter side capacitor C2, and the metal foil 24. The contact detection unit 113 detects contact between the cutter blade 111 and the metal foil 24 based on the detection result of the variable capacitance. This configuration is preferable because the variable capacitance can be effectively detected by configuring the electric circuit CR1 including the fixed capacitance based on the conductive clamp unit 13, the variable capacitance based on the cutter blade 111, and the metal foil 24 of the insulated electric wire 2.

[0035] In this embodiment, the movement mechanism 112 has a servo motor 112a, which moves the cutter blade 111. According to this configuration, the cutter blade 111 is precisely moved by the servo motor 112a, so that the cutting accuracy can be further improved.

[0036] The above-described embodiment merely shows a representative form of the peeling incision device and the peeling incision method. The peeling incision device and the peeling incision method are not limited to the above and can be modified in various ways.

[0037] For example, in the above-described embodiment, the insulated electric wire 2 used in a high voltage wire harness for an automobile or the like is illustrated as an example of the insulated electric wire to be cut for peeling. However, the insulated electric wire to be cut is not limited to this, and the specific mode of use is not limited to this.

[0038] In the above-described embodiment, the insulated electric wire 2 is a thick electric wire in which the conductor core wire 21 is covered with multiple layers of coating material, as an example of the insulated electric wire to be cut for stripping. In addition, the insulating resin inner coating 22, the conductor braid 23, the conductor metal foil 24, and the insulating resin outermost coating 25 are exemplified as examples of the multiple-layer coating material. However, the insulated electric wire to be cut is not limited to this, and the core wire may be covered with one layer of resin coating, and even in the case of a thick electric wire, the specific layer structure of the multiple layers of coating material is not limited. In the case of a simple insulated electric wire in which the core wire is covered with one layer of resin coating, the outermost conductor that is shallowest from the outer circumferential surface is the core wire.

[0039] In the above-described embodiment, three cutting mechanisms 11 each having three mechanism parts 11a arranged at intervals of 120° around the wire axis 2b of the insulated electric wire 2 are exemplified as an example of the cutting mechanism. However, the cutting mechanism is not limited to this, and the specific number and arrangement of the mechanism parts can be arbitrarily set as long as one or more mechanism parts are arranged around the wire axis of the insulated electric wire.

[0040] In the above-described embodiment, the peeling incision device 1 that holds the insulated electric wire 2 with the conductive clamp unit 13 is exemplified as an example of the peeling incision device. The contact detection unit 113 detects the contact between the cutter blade 111 and the metal foil 24 based on the detection result of the fixed capacitance of the clamp-side capacitor C1, the variable capacitance of the cutter-side capacitor C2, and the variable capacitance in the electric circuit CR1 including the metal foil 24. However, the peeling incision device is not limited to this, and the specific holding mode of the insulated electric wire and the specific contact detection mode between the cutter blade and the outermost conductor are not limited to this. However, as described above, by using the electric circuit CR1 including the fixed capacitance of the clamp-side capacitor C1 while holding the insulated electric wire 2 with the conductive clamp unit 13, the variable capacitance of the cutter-side capacitor C2 can be effectively detected.

[0041] In the above-described embodiment, the clamp unit 13 that holds the insulated electric wire by clamping it with the pair of clamping parts 131 is exemplified as an example of the clamp unit. However, the clamp unit is not limited to this, and a specific holding mode can be set arbitrarily as long as it is a conductive one that holds the insulated electric wire.

[0042] In the above-described embodiment, the moving mechanism 112 that moves the cutter blade 111 with the servo motor 112a is exemplified as an example of the moving mechanism. However, the moving mechanism is not limited to this, and a general motor, cylinder mechanism, or the like may be adopted as a driving source. However, as described above, by adopting the servo motor 112a as the driving source in the moving mechanism 112, the cutting accuracy can be further improved. [Explanation of symbols]

[0043] 1 Peeling incision device 2. Insulated wire 2a Outer surface 2b Wire shaft 11 Cutting mechanism 11a Mechanical part 12 Rotation mechanism 13 Clamp section 21 Core Wire 22 Internal coating 23 Braid 24 Metal foil 25 Outermost coating 111 Cutter blade 111a Cutter shaft 112 Moving mechanism 112a Servo motor 112b Cutter connecting frame 113 Contact detection unit 113a IN terminal 113b OUT terminal 131 Clamping part 131a Wire receiving recess C1 Clamp side capacitor C2 Cutter side capacitor CR1 Electrical circuit D11 Cutting rotation direction D12 Cross direction D13 Length direction D14 Radial P11 Cutting position P12 Clamp position P13 Initial position S11 Preparation process S12 First cutting process S13 Second cutting process S14 Rotation process S121 Cutter movement process S122 Contact determination process t11 cutting depth

Claims

1. a cutting mechanism that is provided in one or more pairs so as to have one or more mechanism parts arranged around the axis of a coated electric wire in which a core wire is covered with an insulating layer or the core wire is covered with the insulating layer and one or more conductor layers laminated inside the insulating layer, and that cuts a specified cutting depth from the outer circumferential surface of the coated electric wire in each of the mechanism parts; and a rotation mechanism that rotates the mechanism part with the incision made in the insulated electric wire about the electric wire axis to extend the incision about the electric wire axis, thereby removing a peeled portion according to the incision depth, The cutting mechanism is a conductive cutter blade movable in a direction intersecting the outer circumferential surface; a contact detection unit that detects contact between the outermost conductor and the cutter blade based on a variable capacitance between the cutter blade and an outermost conductor that is shallowest from the outer circumferential surface of the insulated electric wire, the variable capacitance changing in value according to a movement of the cutter blade; a movement mechanism that constitutes the mechanism portion together with the cutter blade and moves the cutter blade in the intersecting direction, and when the contact detection unit detects the contact during the movement of the cutter blade, adjusts the position of the cutter blade in the intersecting direction to a position corresponding to the cutting depth and makes the cut; A cutting device for peeling, comprising:

2. a conductive clamp portion that holds the insulated electric wire while contacting the outer circumferential surface at a clamp position that is spaced apart from the incision position of the cutter blade in the length direction of the insulated electric wire, The peeling incision device according to claim 1, characterized in that the contact detection unit detects the variable capacitance by applying a voltage to an electrical circuit including a fixed capacitance between the clamp portion and the outermost conductor, the variable capacitance, and the outermost conductor, using the clamp portion and the cutter blade as electrodes, and detects the contact based on the detection result.

3. 2. The peeling incision device according to claim 1, wherein the movement mechanism has a servo motor and is a mechanism for moving the cutter blade by the servo motor.

4. A preparation step of using the peeling incision device according to any one of claims 1 to 3, setting the coated electric wire in the peeling incision device, and positioning the cutter blade in an initial position away from the outer circumferential surface in the cross direction; a first cutting step of moving the cutter blade until the contact between the outermost conductor and the cutter blade is detected by the contact detection unit based on the variable capacitance; a second cutting step of adjusting a position of the cutter blade in the cross direction to a position corresponding to the cutting depth and making the cut when the contact is detected by the contact detection unit during the movement of the cutter blade in the first cutting step; a rotating step of rotating the mechanism part with the incision made in the insulated electric wire about an axis of the electric wire to extend the incision about the axis of the electric wire, thereby making it possible to remove the peeled portion; A peeling incision method comprising the steps of:

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