Covering removal device

Abstract

To provide a covering removal device capable of satisfactorily peeling a covering even in a case where a material of the covering is soft or in a case where a removal portion of the covering is long.SOLUTION: A covering removal device 1 comprises: a holding section holding a covered conductor 10; four contact sections 2 which are in surface-contact with an outer peripheral surface of the covered conductor 10 and hold the covered conductor 10 between them; movement means 3 which moves the contact sections 2; and a control section. When a work start signal is inputted to the control section, the holding section holding the covered conductor 10 with a slit 17 formed thereon is moved, and the covered conductor 10 is set between the four contact sections 2 which are being separated from each other. Next, the four contact sections 2 get closer to each other and the contact sections 2 are in surface-contact with the covered conductor 10 closer to an end than the slit 17. The four contact sections 2 holding the covered conductor 10 therebetween are moved to an end side of the covered conductor 10 in a length direction, such that a covering 11 closer to the end than the slit 17 is peeled.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a coating removal device for stripping a coating from a coated electric wire. [Background technology]

[0002] 2. Description of the Related Art A coating removal device that strips the coating from an end of a coated electric wire in order to connect a terminal to the end of the wire is known (see, for example, Patent Document 1).

[0003] Fig. 8 is an explanatory diagram for explaining a coating removal method using a conventional coating removal device. The coating removal device shown in Fig. 8 strips off the coating 11 and metal foil 12 of the coated electric wire 10 shown in Fig. 7, for example. The coated electric wire 10 is an electric wire with a circular cross section, with a conductive core wire 15 surrounded by an insulator 14, a braid 13, a metal foil 12, and an insulating coating 11 in that order.

[0004] The sheath removal device shown in Fig. 8 includes a pair of cutters 16 each having a V-shaped blade 16a, and a moving means for moving these cutters 16. The pair of cutters 16 move toward each other to pierce the sheath 11 and metal foil 12 of the sheathed electric wire 10, and rotate in the direction of the arrow to make circumferential slits in the sheath 11 and metal foil 12. The pair of cutters 16 then move toward the longitudinal end of the sheathed electric wire 10 to strip the sheath 11 and metal foil 12 from the slits on the end side.

[0005] 8 is a contact portion where the cutter 16 comes into contact with the coating 11 and the metal foil 12 when the cutter 16 moves to the longitudinal end of the coated electric wire 10 to strip the coating 11 and the metal foil 12. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2015-35278 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-mentioned conventional technology, when stripping the coating 11 and the metal foil 12, the cutter 16 only comes into contact with the coated electric wire 10 at the contact portion 18 in Fig. 8. Therefore, when the coating 11 is made of a soft material such as silicone, as shown in Fig. 9, only a part of the coating 11 is deformed (turned up, etc.) during stripping, and the force for stripping is not transmitted, which causes a problem that stripping cannot be performed properly. Similarly, when the portion of the coating 11 to be removed is long, the area of ​​the contact portion 18 is small, so that the coating 11 is deformed, causing a problem that stripping cannot be performed properly. Note that reference numeral 17 in Fig. 9 indicates a cut.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a coating removal device that can effectively strip a coating even when the coating material is soft or when the portion of the coating to be removed is long. [Means for solving the problem]

[0009] The present invention provides a coating removal device comprising a plurality of contact portions that make surface contact with the outer peripheral surface of a coated electric wire that has a circular cross section and has a circumferential notch on its outer peripheral surface to sandwich the coated electric wire between themselves, and a moving means for relatively moving the plurality of contact portions that sandwich the coated electric wire and the coated electric wire in the longitudinal direction of the coated electric wire, wherein the plurality of contact portions make surface contact with an end side of the notch of the coated electric wire and are moved relatively toward the longitudinal end side of the coated electric wire to strip the coating of the coated electric wire. Effect of the Invention

[0010] According to the present invention, the multiple contact portions come into surface contact with the end side of the insulated electric wire and are moved relatively toward the longitudinal end side of the insulated electric wire to strip the coating, so that the coating can be stripped well even when the coating is made of a soft material or the portion of the coating to be removed is long. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram of a coating removal device according to a first embodiment of the present invention. [Diagram 2] 2 is a view of the coating removal device of FIG. 1 as seen from another direction. [Diagram 3] FIG. 5 is a schematic configuration diagram of a coating removal device according to a second embodiment of the present invention. [Figure 4] 4 is a diagram showing a state in which a covered electric wire is sandwiched between the pair of contact portions in FIG. 3. FIG. [Diagram 5] 5 is a view of the coating removal device of FIG. 4 seen from another direction. [Figure 6] FIG. 11 is a schematic configuration diagram of a coating removal device according to a third embodiment of the present invention. [Figure 7] FIG. 2 is an explanatory diagram for explaining a cross-sectional structure of a coated electric wire. [Figure 8] 1 is an explanatory diagram for explaining a coating removal method using a conventional coating removal device. [Figure 9] 1 is an explanatory diagram for explaining a problem with a coating removal method using a conventional coating removal device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A coating removal device according to a first embodiment of the present invention will be described with reference to FIGS.

[0013] The sheath removing device 1 shown in Fig. 1 and 2 strips the sheath 11 of the sheathed electric wire 10 shown in Fig. 7, for example. The sheathed electric wire 10 is an electric wire with a circular cross section, with a conductive core wire 15 surrounded by an insulator 14, a braid 13, a metal foil 12, and an insulating sheath 11, in that order. The material of the sheath 11 may be any of polyvinyl chloride, polyethylene, silicone, etc., but the sheath removing device 1 is designed to be able to successfully strip the sheath 11 even when the sheath 11 is made of a soft material such as silicone or when the portion of the sheath 11 to be removed is long.

[0014] The sheath removal device 1 strips the sheath 11 of the insulated electric wire 10, which has a circumferential slit 17 made in advance on its outer circumferential surface, from the end side of the slit 17. The slit 17 is made over the entire circumference of the insulated electric wire 10. The method for making the slit 17 may be the above-mentioned conventional method using a pair of cutters 16, or another method may be used.

[0015] The sheath removal device 1 includes a holding section (not shown) that holds the insulated electric wire 10, four contact sections 2 that come into surface contact with the outer peripheral surface of the insulated electric wire 10 and sandwich the insulated electric wire 10 between them, a moving means 3 that moves each of the contact sections 2, and a control section (not shown).

[0016] The holding portion holds the portion of the coated electric wire 10 on the central side of the slit 17 (that is, the portion where the coating 11 is not peeled off). A well-known chuck or the like can be used as this holding portion.

[0017] All four contact portions 2 have the same configuration. Each contact portion 2 includes a cylindrical main body portion 21 and a rubber portion 22 provided on the entire outer periphery of the main body portion 21. That is, the contact surface of each contact portion 2 with the insulated electric wire 10 is made of rubber. These contact portions 2 are in surface contact with the end side of the insulated electric wire 10 relative to the slits 17, and are moved toward the longitudinal end side of the insulated electric wire 10 to strip the insulated electric wire 10 of its insulated electric wire 10.

[0018] The contact portion 2 can prevent deformation of the coating 11 by increasing the contact area with the coating 11, and can strip the coating 11. In addition, since the contact surface of the contact portion 2 with the coated electric wire 10 is made of rubber, the frictional force of the contact surface can be increased and slippage can be prevented, so that the coating 11 can be stripped more reliably. In addition, in this example, the contact portion 2 is made of the main body portion 21 and the rubber portion 22, but the entire contact portion 2 may be made of rubber.

[0019] The moving means 3 moves the contact portion 2 in the radial direction of the insulated electric wire 10 and in the longitudinal direction of the insulated electric wire 10. The moving means 3 in this example includes a first air cylinder that moves the contact portion 2 in the radial direction of the insulated electric wire 10, and a second air cylinder that moves the contact portion 2 together with the first air cylinder in the longitudinal direction of the insulated electric wire 10. Alternatively, the moving means may be configured by a robot arm, an electric actuator, or the like.

[0020] The control unit controls the holding unit and the moving means 3. The control unit stores a plurality of drive programs in which the part number of the insulated electric wire 10 and the movement amount of the moving means 3 (air supply amount to the first air cylinder and the second air cylinder) are associated with each other. Thus, the sheath removing device 1 can remove the sheath of a plurality of types of insulated electric wires with different part numbers by specifying the drive program to the control unit. For example, when removing the sheath of an insulated electric wire with a smaller diameter than that shown in FIG. 1, the movement distance of each contact portion 2 in the electric wire radial direction (the movement distance until it comes into surface contact with the insulated electric wire) becomes longer. The reason why the device can clamp a plurality of types of insulated electric wires with different diameters is that it has four cylindrical contact portions 2. Also, when the length of the sheath to be removed is longer than that shown in FIG. 2, the movement distance of each contact portion 2 in the electric wire longitudinal direction becomes longer.

[0021] Next, an example of a coating removal method using the coating removal device 1 will be described. In this example, the coating 11 of the coated electric wire 10 is made of soft silicone. In this example, the coating 11 and the metal foil 12 are simultaneously peeled off. Therefore, the slit 17 previously made in the coated electric wire 10 reaches from the surface of the coating 11 to the layer of the metal foil 12.

[0022] When a work start signal is input to the control unit, the holding unit holding the insulated electric wire 10 with the slits 17 moves, and the insulated electric wire 10 is set between the four contact units 2 that are spaced apart from each other. Next, the first air cylinder of the moving means 3 is driven to bring the four contact units 2 closer to each other, and these contact units 2 come into surface contact with the end side of the insulated electric wire 10 relative to the slits 17. That is, the four contact units 2 sandwich the insulated electric wire 10 between themselves (the state shown in Figs. 1 and 2). Then, the second air cylinder of the moving means 3 is driven to move the four contact units 2 sandwiching the insulated electric wire 10 toward the longitudinal end side of the insulated electric wire 10, and as a result, the coating 11 and the metal foil 12 on the end side relative to the slits 17 are peeled off.

[0023] As described above, the sheath removing device 1 strips the sheath 11 by moving the contact parts 2, each having a length in the longitudinal direction of the sheathed electric wire 10, toward the longitudinal end of the wire while being in surface contact with the outer circumferential surface of the sheathed electric wire 10. Therefore, compared with the conventional technology (e.g., the contact part 18 in FIG. 8), the contact area of ​​the contact parts 2 with the sheathed electric wire 10 is larger, and a larger frictional force is applied between the contact parts 2 and the sheath 11, which makes it possible to prevent the sheath 11 from being deformed. In addition, the larger contact area distributes pressure and does not apply a large force to a part of the sheath 11, making it difficult for the sheath 11 to be deformed. As a result, the sheath 11 can be stripped well even if the material of the sheath 11 is soft. In addition, even if the portion of the sheath 11 to be removed is long, the same action as above occurs, and the sheath can be stripped well.

[0024] A "coating removal device" according to a second embodiment of the present invention will be described with reference to Figures 3 to 5. In Figures 3 to 5, the same components as those in the first embodiment described above are given the same reference numerals and the description thereof will be omitted.

[0025] The sheath removing device 101 shown in Figs. 3 to 5 is configured to strip the sheath 11 of the sheathed electric wire 10 shown in Fig. 7, for example, as in the first embodiment. The sheath removing device 101 includes a holding unit (not shown) that holds the sheathed electric wire 10, a pair of contact units 102 that come into surface contact with the outer circumferential surface of the sheathed electric wire 10 to sandwich the sheathed electric wire 10 between them, a moving unit 3 that moves each of the contact units 102, and a control unit (not shown). The holding unit and the moving unit 3 have the same configuration as in the first embodiment.

[0026] Each contact portion 102 includes a plurality of metal plates 122 arranged at intervals in the longitudinal direction of the insulated electric wire 10, and a base 121 to which the plurality of plates 122 are fixed. The plurality of plates 122 protrude from the base 121 toward the insulated electric wire 10. As shown in Fig. 5, each plate 122 is formed with a V-shaped groove 122a for positioning the insulated electric wire 10.

[0027] As shown in Figs. 4 and 5, the pair of contact parts 102 move toward each other to position the insulated electric wire 10 in the grooves 122a of the plates 122 and make surface contact with the end side of the insulated electric wire 10 relative to the slits 17. That is, the inner surface of the groove 122a makes surface contact with the outer peripheral surface of the insulated electric wire 10. In this manner, with the pair of contact parts 102 sandwiching the insulated electric wire 10, the plates 122 of one contact part 102 and the plates 122 of the other contact part 102 are arranged alternately in the longitudinal direction of the electric wire. In addition, a gap is provided in the longitudinal direction of the electric wire between the alternately arranged plates 122. The pair of contact parts 102 are moved toward the longitudinal end side of the insulated electric wire 10 in a state of surface contact with the end side of the insulated electric wire 10 relative to the slits 17, thereby stripping the coating 11 of the insulated electric wire 10.

[0028] The contact part 102 has protrusions formed of multiple plates 122, which sandwich the insulated electric wire 10. By using multiple plates 122, the contact part 102 can strip the coating 11 while preventing deformation of the coating 11. Furthermore, because each plate 122 is thin, the tips of the plates 122 can bite into the coating 11 and prevent slipping. This allows the coating 11 to be stripped more reliably.

[0029] Next, an example of a coating removal method using the coating removal device 101 will be described. In this example, the coating 11 of the coated electric wire 10 is made of soft silicone. In this example, the coating 11 and the metal foil 12 are simultaneously peeled off. Therefore, the slit 17 previously made in the coated electric wire 10 reaches from the surface of the coating 11 to the layer of the metal foil 12.

[0030] When a work start signal is input to the control unit, the holding unit holding the insulated electric wire 10 with the slit 17 moves, and the insulated electric wire 10 is set between the pair of contact units 102 that are spaced apart from each other (the state shown in FIG. 3). Next, the first air cylinder of the moving means 3 is driven to bring the pair of contact units 102 closer to each other, and these contact units 102 come into surface contact with the end side of the insulated electric wire 10 relative to the slit 17. That is, the pair of contact units 102 sandwich the insulated electric wire 10 between them (the state shown in FIGS. 4 and 5). Then, the second air cylinder of the moving means 3 is driven to move the pair of contact units 102 sandwiching the insulated electric wire 10 toward the longitudinal end side of the insulated electric wire 10, and as a result, the coating 11 and the metal foil 12 on the end side relative to the slit 17 are peeled off.

[0031] The above-described sheath removing device 101, like the sheath removing device 1 of the first embodiment, can satisfactorily strip the sheath 11 even when the sheath 11 is made of a soft material or when the portion of the sheath 11 to be removed is long.

[0032] A "coating removal device" according to a third embodiment of the present invention will be described with reference to Fig. 6. In Fig. 6, the same components as those in the first embodiment described above are given the same reference numerals and the description thereof will be omitted.

[0033] A sheath removing device 201 shown in Fig. 6 has four contact parts 202 instead of the four contact parts 2 of the sheath removing device 1 of the first embodiment, and otherwise has the same configuration as the sheath removing device 1. As in the first embodiment, the sheath removing device 201 strips the sheath 11 of a sheathed electric wire 10 shown in Fig. 7, for example.

[0034] Each contact portion 202 is made of metal and formed into a cylindrical shape. The contact surface of the contact portion 202 with the coated electric wire 10, i.e., the outer peripheral surface of the contact portion 202, is formed with projections and recesses to increase frictional force. In this example, the projections and recesses are formed by knurling. Alternatively, the projections and recesses may be formed on the outer peripheral surface of the contact portion 202 by sand blasting or shot blasting.

[0035] The contact portion 202 can prevent deformation of the coating 11 by increasing the contact area with the coating 11, and can strip the coating 11. In addition, since the contact portion 202 has the above-mentioned unevenness formed on the contact surface with the coated electric wire 10, the frictional force of the contact surface can be increased and slippage can be prevented, so that the coating 11 can be stripped more reliably.

[0036] The coating removal method of the coating removal device 201 is similar to that of the coating removal device 1 of the first embodiment, and therefore a description thereof will be omitted.

[0037] The above-described sheath removing device 201, like the sheath removing device 1 of the first embodiment, can satisfactorily strip the sheath 11 even when the sheath 11 is made of a soft material or when the portion of the sheath 11 to be removed is long.

[0038] In the above-described embodiment, an example was described in which the moving means moves the contact portion relative to the fixed insulated electric wire, but in the present invention, the moving means may be configured to move the insulated electric wire relative to the fixed contact portion.

[0039] In the above embodiment, an example has been described in which the coating 11 and the metal foil 12 are stripped from the coated electric wire 10, which is a shielded electric wire having a five-layer structure, but the present invention is not limited thereto. The coating removal device of the present invention can also be applied to a coated electric wire having a two-layer structure in which the coating surrounds the core wire, for example. In addition, it is not limited to which layer of the coated electric wire is stripped from the outermost layer.

[0040] The above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to this embodiment. In other words, the present invention can be embodied in various modifications without departing from the gist of the present invention. As long as the configuration of the present invention is still provided even with such modifications, it is of course included in the scope of the present invention. [Explanation of symbols]

[0041] 1,101,201 Coating removal device 2,102,202 Contact part 3. Transportation 10. Insulated wire 11 Covering

Claims

1. a plurality of contact portions that come into surface contact with an outer peripheral surface of a covered electric wire having a circular cross section and a circumferential notch formed on the outer peripheral surface thereof to sandwich the covered electric wire therebetween; a moving means for relatively moving the plurality of contact portions sandwiching the insulated electric wire and the insulated electric wire in a longitudinal direction of the insulated electric wire, The plurality of contact portions are in surface contact with the end portion of the insulated electric wire relative to the slit, and are moved relatively toward the longitudinal end portion of the insulated electric wire to strip the insulated electric wire. A coating removal device comprising:

2. The contact surface of the contact portion that comes into contact with the insulated wire is made of rubber.

2. The coating removal device according to claim 1.

3. The contact surface of the contact portion that comes into contact with the insulated wire is formed with projections and recesses for increasing frictional force.

2. The coating removal device according to claim 1.

4. The contact portion is configured to include a plurality of plates arranged at intervals in the longitudinal direction of the insulated electric wire, and each of the plurality of plates is in surface contact with an outer circumferential surface of the insulated electric wire.

2. The coating removal device according to claim 1.

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