Apparatus and method for forming cutouts for peeling

Abstract

An apparatus for forming a cutout for peeling, comprising a cutting mechanism comprising: an electrically conductive cutting edge; a contact detection unit for detecting contact between an outermost conductor of the coated electric wire and the cutting blade on the basis of a variable capacitance between the outermost conductor and the cutting blade; and a moving mechanism for adjusting a position of the cutting edge and thus positioning the cutting edge at a position corresponding to a specified cut depth to form a cut when contact between the cutting edge and the outermost conductor is detected by the contact detection portion during movement of the cutting edge.

Description

Technical Field

[0001] The present invention relates to an apparatus and method for forming an incision for peeling, wherein an incision is formed from the outer peripheral surface of a coated electric wire for peeling the coated electric wire. Background Art

[0002] As one of the conventional processes for processing the end of a coated electric wire, a peeling process is widely used, in which the coating is removed to expose an inner conductor such as a core wire. In addition, a device for forming a peeling cut is known, which forms a cut in the coated electric wire starting from the outer peripheral surface of the coated electric wire so that the peeled area can be removed (see, for example, Patent Document 1). The device for forming a peeling cut according to this type of Patent Document 1 includes a pair of V-shaped cutting blades, which are configured to sandwich the coated electric wire between them to bite into the outer peripheral surface, and then rotate around the wire axis of the coated electric wire to form the peeling cut.

[0003] Reference List

[0004] Patent Literature

[0005] Patent Document 1: JP 2000-350324 A Summary of the invention

[0006] The covered electric wire includes a thick electric wire including multiple layers of covering materials, such as an inner covering, a braid, a metal foil, and an outer covering, arranged around a core wire and stacked on each other. In many cases, this type of device for forming a peeling cut is constructed so that the wire axis is used as a reference for the movement of the V-shaped cutting blade when the covered electric wire is clamped by the V-shaped cutting blade, wherein the target position to be reached by the V-shaped cutting blade is determined as the distance from the wire axis. Then, the V-shaped cutting blade is moved toward the wire axis to clamp the covered electric wire so that the V-shaped cutting blade bites into the covered electric wire with a cut depth corresponding to the determined target position. For example, in the case of forming a cut in the thick electric wire as described above, the target position of the V-shaped cutting blade is determined as the distance from the wire axis, which is obtained by subtracting the thickness of the covering material to be removed from the radius of the core wire and the sum of the respective thicknesses of the multiple layers of covering materials. In the case of thick wires, the tolerance of the target position of the V-shaped cutting blade based on the wire axis is often large because the tolerance is a cumulative tolerance obtained from the tolerance of the core wire radius and the tolerance of the thickness of the coating material other than the removed coating material. This may result in low movement accuracy of the V-shaped cutting blade. For example, in the case of forming an incision in a thick wire to the desired coating material included in the thick wire, due to the low movement accuracy of the V-shaped cutting blade, the incision may be formed too deep, so that the incision may extend into the coating material further inside that should be kept untouched. The incision may also be formed too shallow, so that the incision may not be sufficient for peeling.

[0007] In addition, many coated electric wires are wound on bobbins for storage. During such storage, the core wire and / or the coating may be deformed and flattened due to the load of their own weight, or eccentricity may occur in which the axis of the wire may deviate from the center of the coated electric wire. When a coated electric wire having such deformation and / or eccentricity is cut by the above-mentioned type of device for forming a peeling incision, the rotation of a pair of V-shaped cutting blades around the axis of the wire may cause the depth of the incision obtained by the cutting blades in the direction around the axis of the wire to vary. As a result, the obtained incision may be too deep in some areas along the direction around the axis of the wire, thereby possibly cutting into a more inner portion that should not be touched, wherein the incision may be too shallow in some other areas along the direction around the axis of the wire, so that the wire may not be fully cut into.

[0008] Therefore, the above-mentioned type of device for forming a peeling incision, that is, a device having a pair of V-shaped cutting blades that clamp a coated electric wire and then rotate around the axis of the electric wire, has the following problem: when the incision is formed in a thick electric wire and in a coated electric wire wound on a bobbin for storage, the accuracy of the incision formation may be reduced.

[0009] Therefore, the present invention focuses on the above-mentioned problems, and an object of the present invention is to provide an apparatus and method for forming a peeling cut that can improve the accuracy of cut formation when forming a cut in a thick electric wire and / or a covered electric wire wound on a bobbin for storage.

[0010] In order to achieve the above-mentioned purpose, a device for forming an incision for peeling includes: one or more cutting mechanisms, the cutting mechanism including one or more mechanism parts, one of the one or more mechanism parts is associated with one of the one or more cutting mechanisms, wherein the one or more mechanism parts are constructed to be arranged around the wire axis of a coated wire, wherein the coated wire includes a core wire covered by an insulating layer or covered by an insulating layer and one or more conductive layers, wherein the one or more conductive layers are stacked on the inside of the insulating layer, wherein each of the one or more cutting mechanisms is constructed to form one or more incisions in the coated wire at a specified incision depth starting from the outer peripheral surface of the coated wire through each of the one or more mechanism parts; and a rotating mechanism, the rotating mechanism being constructed to rotate the one or more mechanism parts around the wire axis in a state where the one or more mechanism parts have formed the one or more incisions in the coated wire and thereby extend the one or more incisions in a direction around the wire axis. , so that the peeled area corresponding to the incision depth can be removed; wherein each of the one or more cutting mechanisms includes: a conductive cutting blade that can move in a cross direction that intersects the outer peripheral surface; a contact detection portion that is constructed to detect the contact between the outermost conductor and the cutting blade based on a variable capacitance between the outermost conductor and the cutting blade, wherein the outermost conductor is located at a minimum depth from the outer peripheral surface in the coated wire, and the variable capacitance changes depending on the movement of the cutting blade; and a moving mechanism that forms each of the one or more mechanism portions together with the cutting blade, the moving mechanism being constructed to move the cutting blade in the cross direction, wherein the moving mechanism is constructed to adjust the position of the cutting blade in the cross direction when the contact is detected by the contact detection portion during the movement of the cutting blade, and to position the cutting blade to a position corresponding to the incision depth to form one or more incisions therein.

[0011] In order to achieve the above-mentioned purpose, the present invention also provides a method for forming a peeling incision, comprising: a preparation step, placing the coated electric wire in the device as described above, and positioning the cutting blade at an initial position by the device, wherein the initial position is spaced apart from the outer peripheral surface in the cross direction; a first incision forming step, moving the cutting blade until the contact between the outermost conductor and the cutting blade is detected by the contact detection unit based on the variable capacitance; a second incision forming step, when the contact is detected by the contact detection unit during the movement of the cutting blade according to the first incision forming step, adjusting the position of the cutting blade in the cross direction and positioning the cutting blade at a position corresponding to the incision depth to form one or more incisions therein; and a rotation step, rotating the one or more mechanism parts around the axis of the wire, and thereby rotating the one or more mechanism parts around the axis of the wire in a state where the one or more mechanism parts have formed the one or more incisions in the coated electric wire, and thereby extending the one or more incisions in a direction around the axis of the wire, so that the peeling area can be removed.

[0012] With the apparatus and method for forming an incision for peeling, it is possible to improve the accuracy of incision formation when forming an incision in a thick electric wire and / or in a coated electric wire wound on a bobbin for storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram showing a device for forming an incision for peeling according to an embodiment;

[0014] Figure 2 A schematic diagram of the covered wire is shown, which can be obtained by Figure 1 The incision is formed on the coated wire by the device for forming the incision for peeling shown;

[0015] Figure 3 Show according to Figure 2 The covered wires are along Figure 2 A cross-sectional view along line V11-V11 shown;

[0016] Figure 4 Shows the view from the cutting rotation direction according to Figure 1 A schematic side view of a mechanism portion of a cutting mechanism;

[0017] Figure 5 Schematically shows the Figure 1 how the contact detection unit detects the contact between the cutting blade and the metal foil based on the variable capacitance between the metal foil and the cutting blade;

[0018] Figure 6 Schematically shows the Figure 5A clamping portion;

[0019] Figure 7 The diagram is used to illustrate the Figure 5 A schematic circuit diagram of a configuration for contact detection of a cutting edge;

[0020] Figure 8 Shown for illustration purposes Figure 1 A schematic flow chart of a series of processes of a method for forming a peeling incision at an end of a coated electric wire by a device for forming a peeling incision shown in FIG.

[0021] Fig. 9 Shown to illustrate the use of Figure 4 The peripheral structure of the cutting edge shown in the side view is based on Figure 8 An illustrative view of some processes of forming a peeling method using an incision.

[0022] Reference Mark List

[0023] 1 Device for forming an incision for peeling

[0024] 2 Covered wire

[0025] 2a Outer surface

[0026] 2b Wire axis

[0027] 11 Cutting mechanism

[0028] 11a Organization Department

[0029] 12 Rotation mechanism

[0030] 13 Clamping part

[0031] 21 core wire

[0032] 22 covered

[0033] 23 Braid

[0034] 24 metal foil

[0035] 25 outermost covering

[0036] 111 Cutting Edge

[0037] 111a Tool axis

[0038] 112 Mobile mechanism

[0039] 112a Servo motor

[0040] 112b Tool connection frame

[0041] 113 Contact detection unit

[0042] 113a IN terminal

[0043] 113b OUT terminal

[0044] 131 Clamping parts

[0045] 131a Wire receiving recess

[0046] C1 Clamping side capacitor

[0047] C2 Capacitor on tool side

[0048] CR1 Circuit

[0049] D11 Cutting rotation direction

[0050] D12 Cross direction

[0051] D13 Length direction

[0052] D14 Radial

[0053] P11 incision formation position

[0054] P12 Clamping position

[0055] P13 Initial position

[0056] S11 Preparation Steps

[0057] S12 First incision formation step

[0058] S13 Second incision forming step

[0059] S14 Rotation steps

[0060] S121 Tool movement steps

[0061] S122 Contact determination steps

[0062] t11 Cut depth DETAILED DESCRIPTION

[0063] Hereinafter, embodiments of an apparatus and method for forming an incision for peeling will be described.

[0064] Figure 1 A schematic diagram showing an apparatus for forming an incision for skin peeling according to an embodiment. Figure 2 A schematic diagram of the covered wire is shown, which can be obtained by Figure 1 The incision is formed on the coated electric wire by using the device for forming the incision for peeling, and Figure 3 Show according to Figure 2 The covered wires are along Figure 2 A cross-sectional view along line V11 - V11 is shown.

[0065] First, the covered electric wire 2 to be cut according to the present embodiment is a thick electric wire including a multi-layer covering material and a conductive core wire 21 covered by the multi-layer covering material. The covered electric wire 2 is wound on a bobbin for storage and is used, for example, for a high-voltage wiring harness of an automobile. As a covering material, the covered electric wire 2 includes: an inner covering 22 as an insulating layer made of an insulating resin, a braid 23 as a conductive layer, a metal foil 24 as a conductive layer, and an outermost covering 25 as an insulating layer made of an insulating resin. In order to process the end of the covered electric wire 2, the device 1 for forming a peeling cut is constructed to form one or more cuts starting from the outer peripheral surface 2a of the covered electric wire 2 at a specified cut depth, whereby a peeled area corresponding to the cut depth can be removed.

[0066] For example, the incision formation as described below is possible. For example, the following incision formation process can be performed: the depth extending to the inner circumference of the metal foil 24 is designated as the incision depth, so that the outermost coating 25 and the metal foil 24 are defined as a peeling area, wherein one or more incisions extending to the inner circumference of the metal foil 24 are formed. In this example, after peeling, the braid 23 will be exposed at the end of the coated electric wire 2, and the braid 23 accommodates the inner coating 22 and the core wire 21 on its inner side. In addition, as another example, the following incision formation process can be performed: the depth extending to the inner circumference of the inner coating 22 is designated as the incision depth, so that all the coating materials except the core wire 21 are defined as a peeling area, wherein one or more incisions extending to the inner circumference of the inner coating 22 are formed. In this example, after peeling, the core wire 21 is exposed at the end of the coated electric wire 2.

[0067] The device 1 for forming a peeling incision is capable of forming such an incision in a coated electric wire 2, and includes three cutting mechanisms 11 and a rotating mechanism 12. The three cutting mechanisms 11 include a plurality of mechanism parts 11a (three mechanism parts 11a in the present embodiment) in a one-to-one manner, that is, one mechanism part 11a of the mechanism parts 11a is associated with one cutting mechanism 11 in the cutting mechanism 11, wherein the mechanism parts 11a are arranged around the wire axis 2b of the coated electric wire 2. The cutting mechanism 11 is configured to form more than one incision at a specified incision depth starting from the outer peripheral surface 2a of the coated electric wire 2 by each mechanism part 11a. In the present embodiment, the three mechanism parts 11a of the cutting mechanism 11 are arranged around the wire axis 2b and spaced apart from each other at an angle of 120°. The rotating mechanism 12 is configured to rotate the three mechanism parts 11a in the cutting rotation direction D11 around the wire axis 2b in a state where the mechanism parts 11a have formed one or more cuts in the coated wire 2, and thus one or more cuts extend in the cutting rotation direction D11 around the wire axis 2b. In the present embodiment, the rotating mechanism 12 rotates the three cutting mechanisms 11 around the wire axis 2b in the cutting rotation direction D11 by an angle greater than or equal to 120°. This rotation connects the cuts at three positions in the direction around the wire axis 2b to obtain one cut extending over the entire circumference of the coated wire 2, thereby enabling removal of a peeled area corresponding to a specified cut depth.

[0068] In the device 1 for forming an incision for peeling, the three cutting mechanisms 11 are identically configured, including a mechanism portion 11 a. Hereinafter, the configuration of the cutting mechanism 11 will be described with respect to one of the cutting mechanisms 11 .

[0069] Figure 4 Shows the view from the cutting rotation direction according to Figure 1 A schematic side view of the mechanism portion of the cutting mechanism.

[0070] like Figure 1 and Figure 4 As shown, the cutting mechanism 11 includes a cutting blade 111, a moving mechanism 112, and a contact detection portion 113, wherein the cutting blade 111 and the moving mechanism 112 form a mechanism portion 11a, wherein the contact detection portion 113 is configured to detect contact between the outermost conductor and the cutting blade 111, wherein the outermost conductor is located at the smallest depth from the outer peripheral surface 2a in the coated electric wire 2. Figure 2 and Figure 3 As shown, the covered electric wire 2 is cut and the outermost conductor is a metal foil 24 .

[0071] The cutting blade 111 is a conductive disc-shaped cutting member that can move in a crossing direction D12 that crosses the outer peripheral surface 2a of the coated electric wire 2. According to the present embodiment, the moving mechanism 112 includes a cutter frame 112b as described below, wherein the cutting blade 111 is mounted to the cutter frame 112a so that the cutting blade 111 can pivot around a cutter axis 111a that extends along the electric wire axis 2b and crosses the crossing direction D12.

[0072] The moving mechanism 112 is configured to move the cutting blade 111 in the cross direction D12. In addition, during the movement of the cutting blade 111, when the contact between the cutting blade 111 and the metal foil 24 is detected by the contact detection unit 113, the moving mechanism 112 adjusts the position of the cutting blade 111 in the cross direction D12, and positions the cutting blade 111 at a position corresponding to the incision depth to form an incision in the coated electric wire 2. The moving mechanism 112 according to the present embodiment includes a servo motor 112a as a driving source, wherein the servo motor 112a can be driven accurately. In addition, the moving mechanism 112 includes a cutter connection frame 112b, which is driven by the servo motor 112a in the cross direction D12, wherein the cutting blade 111 is pivotably mounted to the end of the cutter connection frame 112 facing the coated electric wire 2. The moving mechanism 112 accurately moves the cutting blade 111 via the cutter coupling frame 112 b by a servo motor 112 a to move the cutting blade 111 into the outer peripheral surface 2 a of the coated electric wire 2 to a designated incision depth.

[0073] As described above, the contact detection portion 113 is configured to detect contact of the cutting edge 111 with the metal foil 24 , wherein such contact detection is performed based on the variable capacitance between the metal foil 24 and the cutting edge 111 , which varies depending on the movement of the cutting edge 111 .

[0074] Figure 5 Schematically shows the Figure 1 How does the contact detection unit detect the contact between the cutting blade and the metal foil based on the variable capacitance between the metal foil and the cutting blade? Figure 6 Schematically shows the Figure 5 The clamping portion, and Figure 7 The diagram is used to illustrate the Figure 5 A schematic circuit diagram of a configuration for contact detection of a cutting edge.

[0075] The clamping portion 13 is a conductive member configured to hold the coated electric wire 2 by contacting the outer peripheral surface 2a at a clamping position P12 that is spaced apart from the cutout forming position P11 of the cutting blade 111 in the length direction D13 of the coated electric wire 2. One clamping portion 13 is provided for each of the three cutting mechanisms 11, and the clamping portion 13 is configured to hold and clamp the coated electric wire 2 in the radial direction D14 of the coated electric wire 2 using a pair of clamping members 131, as shown in FIG. Figure 6 As shown, both clamping members 131 are conductive. Each clamping member 131 has a wire receiving recess 131a formed on the side facing the coated wire 2, wherein the wire receiving recess 131a is recessed in a V shape. The pair of clamping members 131 hold the coated wire 2 by receiving the coated wire 2 in the wire receiving recess 131a, so that the clamping members 131 make contact with the outer peripheral surface 2a of the coated wire 2 on the inner surface of the wire receiving recess 131a.

[0076] As described above, each of the cutting blades 111 of the three cutting mechanisms 11 and the pair of clamping members 131 forming the clamping portion 13 is conductive. One of the pair of clamping members 131 is connected to the IN terminal 113a of the contact detection portion 113 of each of the three cutting mechanisms 11, wherein the cutting blade 111 of each cutting mechanism 11 is connected to the OUT terminal 113b of the corresponding contact detection portion 113. By such connection, a clamping side capacitor C1 is formed between the clamping member 131 connected to the IN terminal 113a of the clamping portion 13 and the metal foil 24 as the outermost conductor in the covered electric wire 2. Since the distance between the clamping member 131 and the metal foil 24 does not change during clamping, the capacitance of the clamping side capacitor C1 is a fixed capacitance having a substantially constant value. On the other hand, a tool side capacitor C2 is formed between the cutting blade 111 and the metal foil 24, wherein the capacitance of the tool side capacitor C2 is a variable capacitance whose value changes with the movement of the cutting blade 111 and the resulting change in the distance to the metal foil 24. When the cutting blade 111 is in contact with the metal foil 24, the value of the variable capacitance is substantially zero. According to the present embodiment, the circuit CR1 is formed by the IN terminal 113a and the OUT terminal 113b of the contact detection portion 113, the clamping side capacitor C1, the tool side capacitor C2, and the metal foil 24 between the two capacitors. The contact detection portion 113 applies an AC voltage between electrodes formed by the cutting blade 111 and the clamping member 131 of the clamping portion 13 to detect the variable capacitance in the tool side capacitor C2, wherein the AC voltage is applied between the electrodes via the IN terminal 113a and the OUT terminal 113b. Based on the detection result, more specifically, based on the variable capacitance of the tool side capacitor C2 having a zero value, the contact detection portion 113 detects the contact between the cutting blade 111 and the metal foil 24.

[0077] When contact is detected by the contact detection unit 113 during the movement of the cutting blade 111, the moving mechanism 112 of each cutting mechanism 11 adjusts the position of the cutting blade 111 in the cross direction D12 to position the cutting blade 111 to a position corresponding to the specified incision depth. In the case where the specified incision depth extends to the metal foil 24, this means that the moving mechanism 112 stops the movement of the cutting blade 111 when the contact is detected. On the other hand, in the case where the specified incision depth extends to the braid 23, when the cutting blade 111 has advanced a distance corresponding to the thickness of the metal foil 24 after the time point when the contact is detected, the moving mechanism 112 will stop the movement of the cutting blade 111. In the case where the incision depth extends to the inner coating 22, when the cutting blade 111 has advanced a distance corresponding to the sum of the thicknesses of the metal foil 24 and the braid 23 after the time point when the contact is detected, the moving mechanism 112 will stop the movement of the cutting blade 111. In the case where the incision depth extends to the core wire 21, when the cutting blade 111 has advanced a distance corresponding to the sum of the thicknesses of the metal foil 24, the braid 23, and the inner coating 22 after the time point of detecting the contact, the moving mechanism 112 stops the movement of the cutting blade 111. Once the incisions are formed in the coated electric wire 2 at three positions at intervals of 120° around the electric wire axis 2b with the specified incision depth, the rotating mechanism 12 rotates the mechanism portion 11a including the cutting blade 111 around the electric wire axis 2b by an angle greater than or equal to 120°. By this rotation, the incisions at the three positions extend in the direction around the electric wire axis 2b to connect to each other, thereby forming one incision extending over the entire circumference of the coated electric wire 2 in the direction around the electric wire axis 2b. This incision forming process can enable the peeled area corresponding to the specified incision depth to be removed.

[0078] Next, a method of forming a peeling incision will be described, in which a peeling incision is formed at the end of a coated electric wire 2 by using the apparatus 1 for forming a peeling incision as described above. Although the following description includes some repetitions of the above description, the following description will be made with reference to other drawings.

[0079] Figure 8 Shown for illustration purposes Figure 1 The illustrated apparatus for forming a peeling incision is a schematic flowchart of a series of processes of a method for forming a peeling incision at an end portion of a coated electric wire. Fig. 9 Shown to illustrate the use of Figure 4 The peripheral structure of the cutting edge shown in the side view is based on Figure 8 An illustrative view of some processes of forming a peeling method using an incision.

[0080] according to Figure 8The process of the method for forming the peeling incision starts when the coated electric wire 2 in which the incision is to be formed is prepared. When a series of processes starts, the preparation step S11 is first performed. In the preparation step S11, the coated electric wire 2 is placed in the device 1, and in each of the mechanism parts 11a of the three cutting mechanisms 11, the cutting blade 111 is located at the initial position P13, wherein the initial position P13 is spaced apart from the outer peripheral surface 2a in the cross direction D12. At this time, the coated electric wire 2 is placed in the device 1 by holding the coated electric wire 2 with the clamping part 13.

[0081] The preparation step S11 is followed by a first cut formation step S12, in which the cutting blade 111 is moved in the cross direction D12 by the moving mechanism 112 as described below. During the first cut formation step S12, the tool movement step S121 and the contact determination step S122 are repeated, wherein the contact determination step S122 is performed based on the variable capacitance of the tool side capacitor C2. In the contact determination step S122, the contact detection unit 113 determines whether the variable capacitance of the tool side capacitor C2 is zero. If the variable capacitance is not zero (determined as "No"), this indicates that the cutting blade 111 is not in contact with the metal foil 24 as the outermost conductor, and the tool movement step S121 is repeated. If the variable capacitance is zero (determined as "Yes"), this indicates that the cutting blade 111 is in contact with the metal foil 24, and the process therefore proceeds to the next step, i.e., the second cut formation step S13.

[0082] After the contact between the cutting blade 111 and the metal foil 24 is detected by the contact detection unit 113, in the second incision forming step S13, the moving mechanism 112 adjusts the position of the cutting blade 111 in the cross direction D12. Through this position adjustment, the cutting blade 111 is positioned at a position corresponding to the specified incision depth t11 to form an incision. In the case where the specified incision depth extends to the metal foil 24, as described above, the movement of the cutting blade 111 is stopped when the contact is detected. On the other hand, in the case where the specified incision depth extends to the braid 23, the movement of the cutting blade 111 stops when the cutting blade 111 has advanced a distance corresponding to the thickness of the metal foil 24 after the time point when the contact is detected. After the contact between the cutting blade 111 and the metal foil 24 has been detected, the above-mentioned position adjustment of the cutting blade 111 is performed in the second incision forming step S13 to form an incision.

[0083] After each of the three cutting mechanisms 11 has performed the second incision forming step S13, the incision extension according to the rotation step S14 will be performed last. In the rotation step S14, in a state where the mechanism part 11a has formed an incision in the coated electric wire 2, the mechanism part 11a of the three cutting mechanisms 11 is rotated by an angle greater than or equal to 120° around the wire axis 2b by the rotation mechanism 12. Through this rotation, the incisions at three positions extend in the direction around the wire axis 2b to connect to each other, so that a incision extending over the entire circumference of the coated electric wire 2 in the direction around the wire axis 2b is formed at the end of the coated electric wire 2. Forming this incision over the entire circumference enables the peeling area corresponding to the specified incision depth t11 to be removed, wherein a series of processes of the method for forming the peeling incision are terminated here. After this, the peeling area that can be removed is removed to expose its interior. The peeling area can be removed manually by the operator, or can be removed by using a dedicated removal device.

[0084] The device 1 and method for forming a peeling incision according to the above-mentioned embodiment can have one or more effects as follows: According to the present embodiment, in order to form one or more peeling incisions by the cutting blade 111, the contact between the metal foil 24 (outermost conductor) and the cutting blade 111 is detected based on the variable capacitance of the cutter side capacitor C2 between the metal foil 24 and the cutting blade 111. After the detection, the position of the cutting blade 111 is adjusted to position the cutting blade 111 to a position corresponding to the specified incision depth t11, for forming one or more incisions with the incision depth t11. According to this configuration, the position where the cutting blade 111 has actually come into contact with the metal foil 24 of the coated electric wire 2 becomes the position as a reference, and then the cutting blade 111 is advanced forward from the position as a reference. By defining the reference for advancement as described above, even in the case of a thick electric wire, the influence of the accumulated thickness tolerance on each coated material can be suppressed, thereby improving the accuracy of incision formation. Furthermore, even for the covered electric wire 2 having deformation and / or eccentricity caused by winding and storage on a bobbin, since the cutting blade 111 is pushed forward after the cutting blade 111 is actually brought into contact with the metal foil 24, the influence of the deformation and / or eccentricity can be suppressed to improve the accuracy of the cut formation. In this way, the present embodiment can provide the accuracy of the cut formation when forming a cut in a thick electric wire and / or in a covered electric wire 2 wound on a bobbin for storage. Furthermore, for the thick electric wire, according to the present embodiment, the specified cut depth t11 can be appropriately variably selected, which enables one or more cuts to be formed in a desired covering material without changing the device structure, wherein the desired covering material can be selected in a wide range.

[0085] According to the present embodiment, a conductive clamping portion 13 is provided, which is configured to hold the coated electric wire 2 at a clamping position P12, wherein the clamping position P12 is spaced apart from the incision forming position P11 of the cutting blade 111. The contact detecting portion 113 is configured to detect the variable capacitance of the cutter side capacitor C2 by applying a voltage to a circuit CR1, wherein the circuit CR1 includes the fixed capacitance of the clamping side capacitor C1, the variable capacitance, and the metal foil 24. In addition, the contact detecting portion 113 detects the contact between the cutting blade 111 and the metal foil 24 based on the detection result of the variable capacitance. This configuration is preferable because it enables the variable capacitance based on the cutting blade 111 to be effectively detected using the circuit CR1 formed by the fixed capacitance based on the conductive clamping portion 13, the variable capacitance, and the metal foil 24 of the coated electric wire 2.

[0086] Furthermore, according to the present embodiment, the moving mechanism 112 includes a servo motor 112a and is configured to move the cutting blade 111 by the servo motor 112a. This configuration can further improve the accuracy of the cut formation by accurately moving the cutting blade 111 by the servo motor 112a.

[0087] It should be noted that the above-mentioned embodiment only shows a representative configuration of the device and method for forming the incision for peeling. The device and method for forming the incision for peeling are not limited thereto, but can be modified and implemented in various ways.

[0088] For example, the above embodiment shows the covered electric wire 2 for example, which is used in a high voltage harness of an automobile, as an example of a covered electric wire with a cut for peeling. However, the covered electric wire with a cut is not limited thereto, but the covered electric wire can be used in any specific manner.

[0089] As an example of a covered electric wire in which a cut for peeling is formed, the above embodiment further shows a covered electric wire 2 in the form of a thick electric wire, which includes a conductive core wire 21 covered by a multi-layer covering material. As an example of a multi-layer covering material as described above, the present embodiment shows an inner covering 22 of an insulating resin, a conductive braid 23, a conductive metal foil 24, and an outermost covering 25 of an insulating resin. However, the covered electric wire subjected to cut formation is not limited thereto, but may include a core wire covered by a single-layer resin covering, and any specific layer structure may be used for the multi-layer covering material, even for a thick electric wire, for example. In the case of a simple covered electric wire including a core wire covered by a single-layer resin covering, the core wire is the outermost conductor at the minimum depth from the outer peripheral surface.

[0090] As an example of the cutting mechanism, the above embodiment shows three cutting mechanisms 11 including three mechanism portions 11a in a one-to-one manner, that is, each mechanism portion 11a is associated with one cutting mechanism 11, wherein the mechanism portions 11a are arranged at intervals of 120° around the wire axis 2b of the coated electric wire 2. However, the cutting mechanism is not limited thereto, but any specific number of cutting mechanisms and any specific arrangement may be selected for the cutting mechanism as long as more than one mechanism portion is arranged around the wire axis of the coated electric wire.

[0091] As an example of a device for forming an incision for peeling, the above embodiment further shows a device 1 for forming an incision for peeling, which holds the coated electric wire 2 by the conductive clamping portion 13. The contact detection portion 113 detects the contact between the cutting blade 111 and the metal foil 24 based on the detection result of the variable capacitance of the tool side capacitor C2 in the circuit CR1, wherein the circuit CR1 includes the fixed capacitance of the clamping side capacitor C1, the variable capacitance, and the metal foil 24. However, the device for forming an incision for peeling is not limited to this, but any specific implementation method for holding the coated electric wire can be selected, and any specific implementation method for detecting the contact between the cutting blade and the outermost conductor can also be selected. However, as described above, by using the circuit CR1 including the fixed capacitance of the clamping side capacitor C1, the variable capacitance of the tool side capacitor C2 can be effectively detected by holding the coated electric wire 2 using the conductive clamping portion 13.

[0092] As an example of the clamping portion, the above embodiment further illustrates the clamping portion 13 which holds the covered electric wire by clamping the covered electric wire between a pair of clamping members 131. However, the clamping portion is not limited thereto, but any specific implementation for holding may be selected as long as the clamping portion is conductive and holds the covered electric wire.

[0093] As an example of a moving mechanism, the above embodiment further shows a moving mechanism 112 that moves the cutting blade 111 by a servo motor 112a. However, the moving mechanism is not limited thereto, but a motor or cylinder mechanism that is generally used as a drive source may be selected, for example. However, as described above, by using a servo motor 112a as a drive source for the moving mechanism 112, the accuracy of the cut formation can be further improved.

Claims

1. A device for forming an incision for peeling, comprising: One or more cutting mechanisms including one or more mechanism parts, one mechanism part among the one or more mechanism parts being associated with one cutting structure among the one or more cutting mechanisms, wherein the one or more mechanism parts are configured to be arranged around a wire axis of a covered wire, wherein the covered wire includes a core wire covered by an insulating layer or covered by an insulating layer and one or more conductive layers, wherein one or more conductive layers are stacked inside the insulating layer, wherein each of the one or more cutting mechanisms is configured to form one or more cuts in the covered wire at a specified cut depth starting from an outer peripheral surface of the covered wire by a corresponding one of the one or more mechanism parts; and a rotating mechanism configured to rotate the one or more mechanism parts around the wire axis in a state where the one or more mechanism parts have formed the one or more cuts in the coated wire, thereby extending the one or more cuts in a direction around the wire axis so that a peeled area corresponding to the cut depth can be removed; Wherein, each of the at least one cutting mechanism comprises: a conductive cutting blade movable in a direction intersecting the outer peripheral surface; a contact detection portion configured to detect contact between the outermost conductor and the cutting blade based on a variable capacitance between the outermost conductor and the cutting blade, wherein the outermost conductor is located at a minimum depth from an outer peripheral surface in the covered electric wire and the variable capacitance varies depending on movement of the cutting blade; and A moving mechanism, which together with the cutting blade forms each of the more than one mechanism parts, and the moving mechanism is constructed to move the cutting blade in the cross direction, wherein the moving mechanism is constructed so that when the contact is detected by the contact detection part during the movement of the cutting blade, the moving mechanism adjusts the position of the cutting blade in the cross direction and positions the cutting blade to a position corresponding to the incision depth to form more than one incision therein.

2. The device according to claim 1, further comprising: A conductive clamping portion is configured to hold the covered electric wire by contacting the outer peripheral surface at a clamping position, wherein the clamping position is spaced apart from a notch forming position of the cutting blade in a length direction of the covered electric wire. wherein the contact detection portion is constructed to detect the variable capacitance by applying a voltage to a circuit using the clamping portion and the cutting blade as electrodes, the circuit comprising a fixed capacitance between the clamping portion and the outermost conductor, the variable capacitance and the outermost conductor, wherein the contact detection portion is constructed to detect the contact based on a detection result of the variable capacitance.

3. The device according to claim 1, in, The moving mechanism includes a servo motor, and Wherein, the moving mechanism is configured to move the cutting blade via the servo motor.

4. A method for forming an incision for peeling, comprising: a preparation step of placing the covered electric wire in the apparatus according to any one of claims 1 to 3, and positioning the cutting blade at an initial position by the apparatus, wherein the initial position is spaced apart from the outer peripheral surface in the intersecting direction; a first incision forming step of moving the cutting blade until contact between the outermost conductor and the cutting blade is detected by the contact detecting portion based on the variable capacitance; a second incision forming step of adjusting the position of the cutting blade in the intersecting direction and positioning the cutting blade at a position corresponding to the incision depth to form one or more incisions therein when the contact is detected by the contact detecting portion during the movement of the cutting blade according to the first incision forming step; and A rotation step, in which one or more of the mechanism parts have formed one or more of the incisions in the coated electric wire, rotate one or more of the mechanism parts around the electric wire axis, thereby extending one or more of the incisions in a direction around the electric wire axis, so that the peeled area can be removed.

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