Cable stripper and electric power tool

Abstract

The present invention addresses the problem of providing a cable stripper and an electric power tool, whereby a coating of a cable can be stripped at a rotational speed that is easy to handle. A cable stripper (1) comprises: an insertion hole (20) into which a cable (4) is inserted; a rotary cutting part (2) having a blade part (5) attached such that a blade edge (50) is positioned in the insertion hole (20); and a power transmission part (3) which has a connection part (30) that is connectable to a rotary drive mechanism, and which transmits a rotational force of the rotary drive mechanism to the rotary cutting part (2) to rotate the rotary cutting part (2). The power transmission part (3) has a speed reduction mechanism (12) that reduces the rotational force of the rotary drive mechanism. The electric power tool comprises: the cable stripper (1); and the rotary drive mechanism that drives the power transmission part (3).

Description

Cable stripper and power tool

[0001] The present disclosure relates to a cable stripper for stripping cable insulation and a power tool.

[0002] Patent Document 1 discloses a cable stripper for stripping cable insulation. This cable stripper is used by being attached to an existing tool such as a drill adapter.

[0003] When this cable stripper is attached to an impact driver, it may apply impact blows to the insulation of large-diameter cables with relatively high load torque, which may generate noise. In addition, the no-load rotational speed of an impact driver is as high as about 2,700 rpm, and the no-load rotational speed of a drill driver is also as high as about 1,800 rpm. Therefore, when this cable stripper is attached to an impact driver or a drill driver, it is difficult to adjust the rotational speed; the rotation is too fast to be handled easily, and there is a risk that the stripped insulation will scatter vigorously due to the centrifugal force generated by high-speed rotation.

[0004] US Patent Application Publication No. 2017 / 0040783

[0005] An object of the present disclosure is to provide a cable stripper and a power tool that can strip cable insulation at an easy-to-handle rotational speed.

[0006] A cable stripper according to one aspect of the present disclosure includes a rotary cutting unit and a power transmission unit. The rotary cutting unit has an insertion hole into which a cable including a core material and an insulation is inserted, and a blade portion attached such that a cutting edge of the blade is positioned inside the insertion hole. The power transmission unit has a connection portion connectable to a rotary drive mechanism, and transmits the rotational force of the rotary drive mechanism to the rotary cutting unit to rotate the rotary cutting unit relative to the cable. The power transmission unit includes a speed reduction mechanism that reduces the speed of the rotational force from the rotary drive mechanism and transmits the reduced rotational force to the rotary cutting unit.

[0007] A power tool according to one aspect of the present disclosure includes the cable stripper described above, and a rotary drive mechanism that drives the power transmission unit of the cable stripper.

[0008] Figure 1 is a perspective view showing a cable stripper according to one embodiment of the present disclosure. Figure 2 is a partially broken side view showing the same cable stripper. Figure 3 is a side cross-sectional view showing the power transmission section of the same cable stripper. Figure 4 is a perspective view showing the main part of the torque limiter of the same cable stripper. Figure 5 is a side view showing a power tool equipped with the same cable stripper.

[0009] (One Embodiment) 1. The cable stripper 1 of one embodiment shown in schematic diagrams 1 and 2 comprises a rotary cutting section 2 and a power transmission section 3. The rotary cutting section 2 has an insertion hole 20 into which a cable 4 including a core material 40 and a sheath 41 is inserted, and a blade section 5 mounted so that the cutting edge 50 is located inside the insertion hole 20. The power transmission section 3 has a connection section 30 that can be connected to a rotary drive mechanism 11 (see Figure 5), and transmits the rotational force of the rotary drive mechanism 11 to the rotary cutting section 2, causing the rotary cutting section 2 to rotate relative to the cable 4. The power transmission section 3 has a reduction mechanism 12 that reduces the rotational force of the rotary drive mechanism 11 and transmits it to the rotary cutting section 2.

[0010] The power tool 10 in one embodiment shown in Figure 5 comprises the cable stripper 1 described above and a rotary drive mechanism 11 that drives the power transmission unit 3.

[0011] In the cable stripper 1 and power tool 10 of the embodiment described above, the rotational force of the rotary drive mechanism 11 can be reduced and transmitted to the rotary cutting section 2, making it easier to reduce the rotational speed of the rotary cutting section 2 to a desired value, and allowing the insulation 41 of the cable 4 to be stripped at an easy-to-handle rotational speed.

[0012] 2. Details Next, a cable stripper 1 and a power tool 10 according to one embodiment will be described in detail with reference to Figures 1 to 5. The power tool 10 comprises a cable stripper 1 and a rotary drive mechanism 11 that drives the power transmission section 3 of the cable stripper 1.

[0013] 2-1. Cable Stripper The cable stripper 1 is used by connecting it to the rotary drive mechanism 11 of the power tool 10, as shown in Figure 5. As shown in Figures 1 and 2, the cable stripper 1 is a device that strips the insulation 41 of a cable 4, such as a power cable or optical cable, inserted inside it, by rotating relative to the cable 4, thereby exposing the core material 40, such as a conductor. The cable stripper 1 has an axis X1, which is the center of rotation. In the following, the direction parallel to the axis X1 will be referred to as the axial direction D1, and the direction in which the cable stripper 1 rotates around the axis X1 will be referred to as the rotation direction E1, and each component will be described accordingly.

[0014] 2-1-1. Rotary cutting section The rotary cutting section 2 has an insertion hole 20 into which the cable 4 is inserted, and a blade section 5 that is mounted so that the cutting edge 50 is located inside the insertion hole 20.

[0015] The rotary cutting unit 2 comprises a main body 6 with an insertion hole 20 on its inside, and a cylindrical part 7 with a housing hole 70 on its inside that communicates with the back of the insertion hole 20 and is connected to the power transmission unit 3.

[0016] The main body 6 is detachably connected to the cylindrical part 7. The main body 6 is attached to the cylindrical part 7 by a detachable fastener 8 such as a pin.

[0017] The main body 6 is cylindrical. The space inside the main body 6 is the insertion hole 20 into which the cable 4 is inserted. In the following, the insertion direction of the cable 4 is used as the reference point, with the insertion direction of the cable 4 (i.e., the right side in Figure 2) being considered the downstream side of the axial direction D1, and the opposite direction (i.e., the left side in Figure 2) being considered the upstream side of the axial direction D1, and each component will be described accordingly.

[0018] The main body 6 has a large-diameter portion 60 and a small-diameter portion 61 aligned in the axial direction D1. The small-diameter portion 61 is located downstream of the large-diameter portion 60 in the axial direction D1. The outer diameter of the small-diameter portion 61 is smaller than the outer diameter of the large-diameter portion 60. The small-diameter portion 61 fits inside the upstream end of the cylindrical portion 7 in the axial direction D1 and is detachably attached to the cylindrical portion 7 by a fastener 8.

[0019] The inner circumferential surface 600 of the large-diameter portion 60 includes a guide surface 600a whose diameter decreases towards the downstream side in the axial direction D1, and a retaining surface 600b that is continuous with the guide surface 600a downstream in the axial direction D1 and has a constant or nearly constant diameter. The diameter of the retaining surface 600b is the same as or slightly larger than the diameter of the outer circumferential surface of the cable sheath 41 of the cable 4. When the tip of the cable 4 is inserted into the large-diameter portion 60, the tip of the cable 4 comes into contact with the guide surface 600a, and the guide surface 600a guides the cable 4 into the retaining surface 600b.

[0020] The blade portion 5 is attached to the large-diameter portion 60 such that the cutting edge 50 is positioned inside the holding surface 600b of the large-diameter portion 60 (i.e., on the axis X1 side). The large-diameter portion 60 is provided with an outlet 62 that penetrates radially through a part of the rotation direction E1 of the large-diameter portion 60. The blade portion 5 is attached to the portion of the large-diameter portion 60 around the outlet 62 by fasteners 51 such as screws. The blade portion 5 is detachably attached to the large-diameter portion 60 and can be replaced if the cutting edge 50 becomes worn or otherwise damaged.

[0021] The diameter of the inner circumferential surface 610 of the small diameter portion 61 is constant or approximately constant along the entire length in the axial direction D1. The diameter of the inner circumferential surface 610 is smaller than the diameter of the holding surface 600b of the large diameter portion 60, and larger than the diameter of the core material 40 of the cable 4.

[0022] The cylindrical portion 7 is cylindrical and extends in the axial direction D1. The power transmission unit 3 is connected to the downstream end of the cylindrical portion 7 in the axial direction D1. The cylindrical portion 7 rotates together with the main body 6 due to the rotational force transmitted from the power transmission unit 3.

[0023] A stopper 9 is attached to the cylindrical portion 7 so as to be movable in the axial direction (i.e., axial direction D1) of the cylindrical portion 7 to receive the tip surface of the core material 40 of the cable 4. The stopper 9 receives the tip surface of the core material 40 after the coating 41 has been removed (i.e., it is not covered by the coating 41). The space inside the cylindrical portion 7 that is upstream of the stopper 9 in the axial direction D1 is the housing hole 70. The housing hole 70 houses the tip of the cable 4, specifically the core material 40 that is not covered by the coating 41.

[0024] The outer circumferential surface 71 of the cylindrical portion 7 has an elongated hole 72 extending in the axial direction of the cylindrical portion 7 (i.e., the axial direction D1). The elongated hole 72 is provided along the entire length of the axial direction D1 in the remaining portion of the cylindrical portion 7, excluding both ends in the axial direction D1. The elongated hole 72 is provided in a part of the outer circumferential direction (i.e., the rotational direction E1) of the outer circumferential surface 71 of the cylindrical portion 7. The elongated hole 72 penetrates the cylindrical portion 7 inward and outward (i.e., in a direction perpendicular to the axis X1). The outer circumferential surface 71 of the cylindrical portion 7 further has an insertion hole 73 through which the fastener 8 is inserted.

[0025] Although not shown in the figures, the portion of the outer circumferential surface 71 of the cylindrical portion 7 around the elongated hole 72 is an inclined surface that is positioned further away from the central axis (i.e., axis X1) of the cylindrical portion 7 as it approaches the power transmission portion 3. The angle that the inclined surface makes with respect to the axis X1 is, for example, 0.5 degrees or more and 2 degrees or less.

[0026] The stopper 9 comprises a stopper body 90 and an operating part 91. The stopper body 90 is located inside the housing hole 70 and is movable in the axial direction of the cylindrical part 7 (i.e., axial direction D1). The operating part 91 is located outside the cylindrical part 7 and is movable in a direction perpendicular to the axial direction of the cylindrical part 7.

[0027] The stopper body 90 is substantially cylindrical. The stopper body 90 has a small diameter portion 90a and a large diameter portion 90b. The diameter of the large diameter portion 90b is the same as or approximately the same as the diameter of the inner circumferential surface of the cylindrical portion 7. The small diameter portion 90a has a smaller diameter than the large diameter portion 90b. The large diameter portion 90b is continuous with the small diameter portion 90a on the downstream side in the axial direction D1. The small diameter portion 90a and the large diameter portion 90b are arranged concentrically. The upstream end face of the small diameter portion 90a in the axial direction D1 is the surface that receives the tip surface of the core material 40 of the cable 4. The large diameter portion 90b is provided with a through hole 92 that penetrates in a direction perpendicular to the axis X1.

[0028] The operating unit 91 includes an operating unit body 910 provided in the shape of a disc, and a connecting shaft 911 extending from the operating unit body 910 toward the stopper body 90.

[0029] Multiple anti-slip grooves 912 are provided on the outer circumferential surface of the operating unit body 910. Multiple grooves 912 are provided on the outer circumferential surface of the operating unit body 910 so as to extend around its entire circumference. The connecting shaft 911 has screw threads on its outer circumferential surface and is mounted in a through hole 92 of the stopper body 90 so as to be able to move back and forth.

[0030] The operating unit 91 is movable between a fixed position where the operating unit body 910 is in contact with the edge of the elongated hole 72 on the outer circumferential surface 71 of the cylindrical portion 7, and an unfixed position where the operating unit body 910 is located away from the edge of the hole, by rotating the operating unit body 910.

[0031] When the operating unit body 910 is in a fixed position, the wall of the cylindrical portion 7 is sandwiched between the operating unit body 910 and the stopper body 90, preventing the stopper body 90 from moving in the axial direction D1, and thus fixing the position of the stopper body 90. When the operating unit body 910 is in an unfixed position, the stopper body 90 is movable in the axial direction D1.

[0032] Of the outer circumferential surface 71 of the cylindrical portion 7, the portion around the elongated hole 72 is an inclined surface that is positioned further from the central axis of the cylindrical portion 7 the closer it is to the power transmission portion 3. Therefore, even if the core material 40 of the cable 4 collides with the stopper body 90 when the operating unit body 910 is in a fixed position, the inclined surface can prevent the operating unit body 910 from shifting downstream in the axial direction D1, thereby preventing the stopper body 90 from shifting position.

[0033] 2-1-2. Power transmission section The power transmission section 3 has a connection section 30 that can be connected to the rotary drive mechanism 11 (see Figure 5). The power transmission section 3 transmits the rotational force of the rotary drive mechanism 11 to the rotary cutting section 2, causing the rotary cutting section 2 to rotate relative to the cable 4. The power transmission section 3 is driven by being connected to the rotary drive mechanism 11 of the power tool 10, thereby rotating the rotary cutting section 2.

[0034] The connection part 30 is detachably connected to the rotary drive mechanism 11. As shown in Figure 3, the connection part 30 has a bit part 300 that is connected to a bit mounting part (not shown) of the power tool 10, and a pair of release operation parts 301 that release the connection between the bit part 300 and the bit mounting part. By pressing the pair of release operation parts 301, the bit part 300 can be removed from the bit mounting part of the power tool 10.

[0035] The power transmission unit 3 further includes an output-side connection part 31 that is connected to the downstream end of the cylindrical portion 7 of the rotary cutting unit 2 in the axial direction D1. The output-side connection part 31 is fitted inside the downstream end of the cylindrical portion 7 in the axial direction D1 and rotates integrally with the cylindrical portion 7. The output-side connection part 31 is fixed to the tip of the output shaft 32 of the power transmission unit 3 and rotates around the axis X1.

[0036] The power transmission unit 3 further includes a reduction mechanism 12 that reduces the rotational force of the rotational drive mechanism 11 and transmits it to the rotational cutting unit 2. The reduction mechanism 12 has a plurality of reduction sections 120 with different reduction ratios. The plurality of reduction mechanisms 12 have a first reduction section 120a, a second reduction section 120b, and a third reduction section 120c, each with different reduction ratios. The first reduction section 120a, the second reduction section 120b, and the third reduction section 120c are located side by side in the axial direction D1. The first reduction section 120a is located upstream of the second reduction section 120b in the axial direction D1, and the third reduction section 120c is located upstream of the first reduction section 120a in the axial direction D1.

[0037] The power transmission unit 3 further includes a gear shift mechanism 13 that can switch the reduction ratio of the reduction mechanism 12. The gear shift mechanism 13 has an operating unit 130 for switching the reduction ratio of the reduction mechanism 12.

[0038] The reduction ratio of the reduction mechanism 12 can be switched within a range of, for example, 1 / 10 to 1 / 20. The reduction ratio of the reduction mechanism 12 is set appropriately according to the no-load rotational speed of the rotary drive mechanism 11 connected to the power transmission unit 3.

[0039] The first reduction gear 120a, the second reduction gear 120b, and the third reduction gear 120c are each composed of a planetary gear mechanism, and each has a ring gear, a sun gear, and a planet gear. A conventionally known structure can be applied as the planetary gear mechanism, so a detailed explanation is omitted.

[0040] The gear shifting mechanism 13 has a pin-shaped operating part 130. The operating part 130 is movable between a first position (shown in Figure 3) in which it catches on a part of the outer circumferential surface of the ring gear of the first reduction unit 120a and fixes the ring gear, and a second position in which it catches on the outer circumferential surface of the ring gear of the second reduction unit 120b and fixes the ring gear. The first position is located upstream of the second position in the axial direction D1.

[0041] When the operating unit 130 is operated to position it in the first position, the ring gear of the first reduction unit 120a stops, and the planet gear and sun gear inside this ring gear rotate. As a result, the first reduction unit 120a and the third reduction unit 120c function, and the reduction ratio of the reduction mechanism 12 becomes 1 / 18. At this time, the ring gear of the second reduction unit 120b rotates freely, so the second reduction unit 120b does not perform its reduction function.

[0042] When the operating unit 130 is operated to position it in the second position, the ring gear of the second reduction unit 120b stops, and the planet gear and sun gear inside this ring gear rotate. As a result, the second reduction unit 120b and the third reduction unit 120c function, and the reduction ratio of the reduction mechanism 12 becomes 1 / 12. At this time, the ring gear of the first reduction unit 120a rotates freely, so the first reduction unit 120a does not perform its reduction function.

[0043] The no-load rotational speed of an impact driver is, for example, around 2700 rpm, while the no-load rotational speed of a drill driver is, for example, around 1800 rpm. The no-load rotational speed of an impact driver is higher than that of a drill driver, for example, about 1.5 times.

[0044] When the rotation drive mechanism 11 is a mechanism of an impact driver, the reduction ratio of the speed reduction mechanism 12 is set to 1 / 18, and the rotation speed transmitted from the rotation drive mechanism 11 to the output shaft 32 can be reduced to about 150 rpm. When the rotation drive mechanism 11 is a mechanism of a drill driver, the reduction ratio of the speed reduction mechanism 12 is set to 1 / 12, and the rotation speed transmitted from the rotation drive mechanism 11 to the output shaft 32 can be reduced to about 150 rpm. That is, in both cases where the rotation drive mechanism 11 is an impact driver mechanism and a drill driver mechanism, the rotation speed transmitted from the rotation drive mechanism 11 to the output shaft 32 can be reduced to approximately the same level.

[0045] The power transmission unit 3 further includes a torque limiter 14. The torque limiter 14 stops transmission of the rotational force of the rotation drive mechanism 11 to the rotary cutting unit 2 when the torque applied to the rotary cutting unit 2 reaches or exceeds a predetermined value.

[0046] As shown in Fig. 3 and Fig. 4, the torque limiter 14 includes a ring gear 140 and a spherical body 141 that is spring-biased and pressed against one axial surface 140a of the ring gear 140. The ring gear 140 is a part of the third speed reduction portion 120c. The spherical body 141 is pressed against the ring gear 140 by the biasing force of a coil spring 143. The spherical body 141 may be spring-biased by a disc spring, and in this case, size reduction of the power transmission portion 3 in the axial direction D1 can be achieved.

[0047] Said one surface 140a has peak portions 142 on which the spherical body 141 is caught when the ring gear 140 rotates forward and reversely. Each peak portion 142 includes a first inclined surface 142a facing the reverse rotation direction of the ring gear 140 and a second inclined surface 142b facing the forward rotation direction of the ring gear 140. The inclination of the second inclined surface 142b with respect to the flat portion, which is the remaining part of said one surface 140a excluding the peak portions 142, is smaller than that of the first inclined surface 142a. Said one surface 140a has a plurality of peak portions 142 positioned at intervals in the circumferential direction of the ring gear 140. In said one surface 140a, the portion between two circumferentially adjacent peak portions 142 is the flat portion.

[0048] When the bit unit 300 connected to the rotation drive mechanism 11 rotates forward, the ring gear 140 meshed via a plurality of gears with a sun gear (not shown) of the bit unit 300 rotates in reverse. When the bit unit 300 connected to the rotation drive mechanism 11 rotates in reverse, the ring gear 140 meshed via a plurality of gears with the sun gear (not shown) of the bit unit 300 rotates forward.

[0049] The first inclined surface 142a is a surface that the spherical body 141 abuts against when the bit unit 300 rotates forward and the ring gear 140 rotates in reverse. The second inclined surface 142b is a surface that the spherical body 141 abuts against when the bit unit 300 rotates in reverse and the ring gear 140 rotates forward.

[0050] Since the inclination of the second inclined surface 142b is smaller than that of the first inclined surface 142a, the clutch torque during reverse rotation of the rotation drive mechanism 11 can be reduced. Accordingly, even if the cut coating 41 is bitten when the rotary cutting unit 2 is rotated in reverse, it is possible to suppress excessive torque from being applied to the cutting edge 50 of the blade unit 5.

[0051] Furthermore, when the rotary cutting unit 2 is rotated forward and a torque of a predetermined value or more is generated between the cutting edge 50 of the blade unit 5 and the coating 41, the spherical body 141 of the torque limiter 14 climbs over the first inclined surface 142a of the crest 142 of the ring gear 140. Accordingly, transmission of the rotational force of the rotation drive mechanism 11 to the rotary cutting unit 2 is stopped.

[0052] The power transmission unit 3 further includes a manual tightening mechanism 33. The manual tightening mechanism 33 is a mechanism for releasing the connected state between the rotary cutting unit 2 and the rotation drive mechanism 11 when the rotary cutting unit 2 is gripped by hand and rotated forward, to prevent the rotational force of the rotary cutting unit 2 from being transmitted to the rotation drive mechanism 11. The power transmission unit 3 does not need to include the manual tightening mechanism 33, and in this case, size reduction of the power transmission unit 3 in the axial direction D1 can be achieved.

[0053] 2-2. Electric Power Tool The electric power tool 10 shown in FIG. 5 includes the above-described cable stripper 1 and the rotation drive mechanism 11 that drives the power transmission unit 3 of the cable stripper 1.

[0054] The power tool 10 is a drill driver. Conventional, well-known drill drivers can be used. The power tool 10 may also be an impact driver.

[0055] The power tool 10 includes a rotary drive mechanism 11 which comprises a chuck (not shown) on which tools such as screwdriver bits and sockets are detachably attached, and a motor (not shown) that rotates the chuck.

[0056] The power tool 10 further includes a clutch 15 for adjusting the tightening force, a housing 16, a trigger switch 17, a forward / reverse selector switch 18, and a speed change switch 19, etc. The housing 16 includes a grip 160 and a battery mounting section 161. The power tool 10 can drive the motor and rotate the chuck by attaching a battery (not shown) to the battery mounting section 161. The power tool 10 may further include a power cord connected to a commercial power source.

[0057] The bit portion 300 of the cable stripper 1 is attached to the chuck (i.e., the bit mounting portion). The bit portion 300 can be removed from the chuck by pressing the pair of release operation portions 301.

[0058] In the power tool 10, by selecting forward rotation with the forward / reverse selector switch 18 and pressing the trigger switch 17 with a finger to rotate the chuck forward, the bit portion 300 of the cable stripper 1 can be rotated forward at high speed. The rotation of the bit portion 300 is reduced by the reduction mechanism 12 and transmitted to the output shaft 32, and the reduced rotational force is transmitted from the output shaft 32 to the cylindrical portion 7 and the main body portion 6 (i.e., the rotary cutting portion 2) via the output side connection portion 31. As a result, the rotary cutting portion 2 can be rotated forward at a reduced rotational speed, and the cutting edge 50 of the blade portion 5 of the rotary cutting portion 2 can cut the insulation 41 at the tip of the cable 4 and peel the insulation 41 from the core material 40. The cut insulation 41 is discharged from the discharge port 62. When the core material 40, from which the insulation 41 has been removed, moves downstream in the axial direction D1 and hits the end face of the stopper body 90, the cable 4 can no longer move downstream in the axial direction D1. In this state, a portion of the coating 41 in the axial direction D1 is cut by the cutting edge 50 over the entire circumference in the rotational direction E1, and the peeled coating 41 separates from the coating 41 upstream of that point in the axial direction D1.

[0059] 3. Effects and Effects As described above, the cable stripper 1 reduces the rotational force of the rotary drive mechanism 11 by the reduction mechanism 12 of the power transmission unit 3 and transmits it to the rotary cutting unit 2 of the cable stripper 1.

[0060] Therefore, even when the cable stripper 1 is connected to a drill driver or impact driver, the rotation speed of the rotating cutting section 2 can be easily controlled, allowing the cable 4's insulation 41 to be stripped at a manageable rotation speed. This makes the cable stripper 1 easier to use, and also prevents the stripped insulation 41 from flying off forcefully.

[0061] Furthermore, when the cable stripper 1 is connected to an impact driver, the rotation speed of the rotating cutting section 2 can be reduced, which means that less torque is applied to the rotational drive mechanism 11, making impact blows less likely and reducing noise.

[0062] Furthermore, the cable stripper 1 allows the reduction ratio of the reduction mechanism 12 to be switched by the speed change mechanism 13. Therefore, with the cable stripper 1, it is easy to keep the rotation speed of the rotating cutting section 2 within a desired range, regardless of whether it is connected to an impact driver or a drill driver, which have different no-load rotation speeds.

[0063] Furthermore, in the cable stripper 1, if the torque applied to the rotary cutting section 2 exceeds a predetermined value, the torque limiter 14 can stop the transmission of the rotational force of the rotary drive mechanism 11 to the rotary cutting section 2. Therefore, the cable stripper 1 makes it easier to prevent the cutting edge 50 from hitting the core material 40 of the cable 4, thereby preventing damage to the core material 40 or chipping of the cutting edge 50.

[0064] Furthermore, since the power tool 10 is equipped with the cable stripper 1 described above, it can achieve the same effects and benefits as described above.

[0065] 4. Modifications Next, modifications of the cable stripper 1 and power tool 10 of the above-described embodiment will be explained. The following modifications can be combined as appropriate.

[0066] The power transmission unit 3 does not necessarily have a gear shift mechanism 13. In this case, the reduction mechanism 12 is provided such that the reduction ratio corresponds to a reduction ratio corresponding to the connected rotary drive mechanism 11, and the reduction ratio is set to a predetermined value between 1 / 20 and 1 / 10.

[0067] Furthermore, the reduction mechanism 12 is not limited to the structure described above, but may be provided in other conventionally known structures.

[0068] The rotating cutting section 2 of the cable stripper 1 may have multiple types of main body sections 6 to match the thickness of the cable 4.

[0069] The rotary cutting section 2 may be formed by integrally molding the main body section 6 and the cylindrical section 7.

[0070] The stopper 9 does not necessarily have an operating part 91, and may be fixed immovably on the cylindrical part 7. In this case, the cylindrical part 7 does not necessarily have an elongated hole 72. In other words, the cable stripper 1 may be used to strip the insulation 41 of the cable 4 to a predetermined length.

[0071] The outer circumferential surface 71 of the cylindrical portion 7 does not have to be an inclined surface that is tilted so that the portion closer to the power transmission portion 3 is located further away from the central axis of the cylindrical portion 7. The outer circumferential surface 71 of the cylindrical portion 7 may have a constant cross-sectional area over its entire length in the axial direction D1.

[0072] The power transmission unit 3 does not necessarily have a torque limiter 14. Also, the first inclined surface 142a and the second inclined surface 142b of the peaks 142 of the ring gear 140 of the torque limiter 14 may have the same inclination.

[0073] The torque limiter 14 is not limited to the structure described above, and only needs to stop transmitting the rotational force of the rotation drive mechanism 11 to the rotation cutting unit 2 when the torque applied to the rotation cutting unit 2 exceeds a predetermined value.

[0074] The cable stripper 1 may be connected to a rotary drive mechanism 11 of any power tool, not limited to an impact driver or drill driver.

[0075] 5. Summary As described above in one embodiment and its modified form, the cable stripper (1) of the first embodiment has the following configuration.

[0076] In other words, the cable stripper (1) of the first embodiment comprises a rotary cutting section (2) and a power transmission section (3). The rotary cutting section (2) has an insertion hole (20) into which a cable (4) including a core material (40) and a sheath (41) is inserted, and a blade section (5) mounted such that the cutting edge (50) is located within the insertion hole (20). The power transmission section (3) has a connection section (30) that can be connected to a rotary drive mechanism (11). The power transmission section (3) transmits the rotational force of the rotary drive mechanism (11) to the rotary cutting section (2), causing the rotary cutting section (2) to rotate relative to the cable (4). The power transmission section (3) has a reduction mechanism (12) that reduces the rotational force of the rotary drive mechanism (11) and transmits it to the rotary cutting section (2).

[0077] In the first embodiment of the cable stripper (1) having the above configuration, the rotational force of the rotary drive mechanism (11) can be reduced and transmitted to the rotary cutting section (2), making it easier to reduce the rotational speed of the rotary cutting section (2) and making it easier to strip the insulation (41) of the cable (4) at an easy-to-handle rotational speed.

[0078] Furthermore, as described above in one embodiment and its modified form, the cable stripper (1) of the second embodiment additionally includes the following configuration in addition to the configuration of the first embodiment.

[0079] In other words, in the cable stripper (1) of the second embodiment, the power transmission unit (3) further includes a speed change mechanism (13) that can switch the reduction ratio of the reduction mechanism (12).

[0080] In the second embodiment of the cable stripper (1) having the above configuration, the reduction ratio of the reduction mechanism (12) can be switched by the speed change mechanism (13). Therefore, in the second embodiment of the cable stripper (1), it is easy to set the rotational cutting section (2) to an appropriate rotational speed according to the type of rotational drive mechanism (11) (in other words, the difference in rotational speed).

[0081] Furthermore, as described in the embodiment and its modified form above, the cable stripper (1) of the third embodiment additionally includes the following configuration in addition to the configuration of the second embodiment.

[0082] In other words, in the third embodiment of the cable stripper (1), the reduction mechanism (12) has a plurality of reduction units (120) with different reduction ratios. The gear shifting mechanism (13) has an operating unit (130) for switching between the functional reduction units (120) from among the plurality of reduction units (120).

[0083] In the third embodiment of the cable stripper (1) having the above configuration, the operating part (130) of the speed change mechanism (13) allows switching between the functional reduction unit (120) from among the multiple reduction units (120). Therefore, in the third embodiment of the cable stripper (1), it is easy to set the rotational cutting unit (2) to an appropriate rotational speed according to the type of rotational drive mechanism (11) (in other words, the difference in rotational speed).

[0084] Furthermore, as described in the embodiment and its modified form above, the cable stripper (1) of the fourth embodiment additionally includes the following configuration in addition to the configuration of any one of the first to third embodiments.

[0085] In other words, in the fourth embodiment of the cable stripper (1), the rotary cutting section (2) has a main body (6) with an insertion hole (20) on its inside, and a cylindrical section (7) with a housing hole (70) on its inside that communicates with the back of the insertion hole (20) and is connected to a power transmission section (3). A stopper (9) that receives the tip surface of the core material (40) is attached to the cylindrical section (7) so as to be movable in the axial direction of the cylindrical section (7).

[0086] In the fourth embodiment of the cable stripper (1) having the above configuration, the position of the stopper (9) inside the cylindrical part (7) can be changed, so that the length of the cable (4) sheath (41) can be stripped can be adjusted.

[0087] Furthermore, as described in the embodiment and its modified form above, the cable stripper (1) of the fifth embodiment additionally includes the following configuration in addition to the configuration of the fourth embodiment.

[0088] In other words, in the fifth embodiment of the cable stripper (1), the outer circumferential surface (71) of the cylindrical portion (7) has an elongated hole (72) extending in the axial direction of the cylindrical portion (7) (i.e., axial direction D1). The stopper (9) integrally comprises a stopper body (90) located within the housing hole (70) and movable in the axial direction, and an operating portion (91) located outside the cylindrical portion (7) and movable in a direction perpendicular to the axial direction. Of the outer circumferential surface (71) of the cylindrical portion (7), the portion around the elongated hole (72) is an inclined surface that is tilted such that the portion closer to the power transmission portion (3) is located further away from the central axis (i.e., axis X1) of the cylindrical portion (7).

[0089] In the fifth embodiment of the cable stripper (1) having the above configuration, the inclined surface prevents the operating part (91) from shifting toward the power transmission part (3) from a state in which the stopper body (90) inside the cylindrical part (7) is positioned by the operating part (91) contacting the part around the elongated hole (72) on the outer surface (71) of the cylindrical part (7). Therefore, in the fifth embodiment of the cable stripper (1), it is possible to prevent the stopper body (90) from shifting toward the stopper body (90) when the core material (40) of the cable (4) collides with the stopper body (90). As a result, in the fifth embodiment of the cable stripper (1), it is easier to stably strip the core material (40) of the cable (4) to a desired length.

[0090] Furthermore, as described above in one embodiment and its modified form, the cable stripper (1) of the sixth embodiment additionally includes the following configuration in addition to the configuration of any one of the first to fifth embodiments.

[0091] In other words, in the cable stripper (1) of the sixth embodiment, the power transmission unit (3) further includes a torque limiter (14) that stops the transmission of rotational force from the rotational drive mechanism (11) to the rotational cutting unit (2) when the torque applied to the rotational cutting unit (2) exceeds a predetermined value.

[0092] In the sixth embodiment of the cable stripper (1) having the above configuration, when the torque applied to the rotary cutting section (2) exceeds a predetermined value, the transmission of rotational force from the rotary drive mechanism (11) to the rotary cutting section (2) can be stopped by the torque limiter (14). Therefore, in the sixth embodiment of the cable stripper (1), the rotation of the rotary cutting section (2) can be stopped when the cutting edge (50) of the blade section (5) of the rotary cutting section (2) hits the core material (40) of the cable (4), so that damage to the cutting edge (50) or the core material (40) is less likely to occur.

[0093] Furthermore, as described in the embodiment and its modified form above, the cable stripper (1) of the seventh embodiment additionally includes the following configuration in addition to the configuration of the sixth embodiment.

[0094] In other words, in the seventh embodiment of the cable stripper (1), the torque limiter (14) comprises a ring gear (140) and a spherical body (141) that is spring-biased and presses against one axial surface (140a) of the ring gear (140). The surface (140a) has a peak (142) that the spherical body (141) catches on when the ring gear (140) rotates in the forward and reverse directions. The peak (142) includes a first inclined surface (142a) facing the reverse rotation direction of the ring gear (140) and a second inclined surface (142b) facing the forward rotation direction of the ring gear (140). The second inclined surface (142b) has a smaller inclination than the first inclined surface (142a) with respect to the flat portion which is the remaining part of the surface (140a) excluding the peak (142).

[0095] In the seventh embodiment of the cable stripper (1) having the above configuration, the second inclined surface (142b) of the peak (142) of the ring gear (140) facing the forward rotation direction has a smaller inclination than the first inclined surface (142a) facing the reverse rotation direction. Therefore, in the seventh embodiment of the cable stripper (1), when the cutting edge (50) becomes jammed with the sheathing (41) after cutting and locks up during the reverse rotation of the rotary cutting section (2), the torque required to release the lock (i.e., the torque required for the spherical body 141 to overcome the second inclined surface 142b) can be reduced. As a result, in the seventh embodiment of the cable stripper (1), excessive torque is suppressed from being applied from the cutting edge (50) to the object it contacts during the reverse rotation of the rotary cutting section (2).

[0096] Furthermore, as described in the embodiment and its modified form above, the power tool (10) of the eighth embodiment comprises a cable stripper (1) of any one of the first to seventh embodiments and a rotary drive mechanism (11) that drives the power transmission section (3) of the cable stripper (1).

[0097] In the eighth embodiment of the power tool (10) having the above configuration, the rotational force of the rotary drive mechanism (11) can be reduced and transmitted to the rotary cutting section (2), making it easier to control the rotational speed of the rotary cutting section (2) and making it easier to strip the insulation (41) from the cable (4) at an easy-to-handle rotational speed.

[0098] Although the present disclosure has been described above based on the embodiments shown in the attached drawings, the present disclosure is not limited to the above embodiments, and appropriate design modifications are possible within the scope intended by the present disclosure.

[0099] 1 Cable stripper 2 Rotary cutting section 20 Insertion hole 3 Power transmission section 30 Connection section 4 Cable 40 Core material 41 Sheath 5 Blade section 50 Cutting edge 6 Main body section 7 Cylindrical section 70 Housing hole 71 Outer surface 72 Slotted hole 9 Stopper 90 Stopper body 91 Operating section 10 Power tool 11 Rotary drive mechanism 12 Reduction mechanism 120 Reduction section 13 Speed ​​change mechanism 130 Operating section 14 Torque limiter 140 Ring gear 140a One surface 141 Spherical body 142 Peak section 142a First inclined surface 142b Second inclined surface

Claims

1. A cable stripper comprising: a rotary cutting section having an insertion hole into which a cable including a core material and a sheath is inserted, and a blade section mounted such that the cutting edge is positioned within the insertion hole; and a power transmission section having a connection section that can be connected to a rotary drive mechanism, which transmits the rotational force of the rotary drive mechanism to the rotary cutting section to rotate the rotary cutting section relative to the cable, wherein the power transmission section has a reduction mechanism that reduces the rotational force of the rotary drive mechanism and transmits it to the rotary cutting section.

2. The cable stripper according to claim 1, wherein the power transmission unit further comprises a speed change mechanism capable of switching the reduction ratio of the reduction mechanism.

3. The cable stripper according to claim 2, wherein the reduction mechanism has a plurality of reduction units with different reduction ratios, and the gear shift mechanism has an operating unit for switching between the functional reduction units among the plurality of reduction units.

4. The rotary cutting section comprises a main body with an insertion hole on its inner side, and a cylindrical section with a housing hole on its inner side that communicates with the back of the insertion hole and is connected to the power transmission section, wherein a stopper that receives the tip surface of the core material is attached to the cylindrical section so as to be movable in the axial direction of the cylindrical section.

5. The cable stripper according to claim 4, wherein the outer circumferential surface of the cylindrical portion has an elongated hole extending in the axial direction of the cylindrical portion, the stopper integrally comprises a stopper body located within the housing hole and movable in the axial direction, and an operating portion located outside the cylindrical portion and movable in a direction perpendicular to the axial direction, and the portion of the outer circumferential surface of the cylindrical portion around the elongated hole is an inclined surface that is inclined such that the portion closer to the power transmission portion is located further away from the central axis of the cylindrical portion.

6. The cable stripper according to any one of claims 1 to 5, wherein the power transmission unit further includes a torque limiter that stops the transmission of the rotational force of the rotational drive mechanism to the rotational cutting unit when the torque applied to the rotational cutting unit exceeds a predetermined value.

7. The torque limiter comprises a ring gear and a spherical body that is spring-biased and presses against one axial surface of the ring gear, wherein the surface has a ridge that the spherical body catches on when the ring gear rotates in the forward and reverse directions, the ridge includes a first inclined surface facing the reverse rotation direction of the ring gear and a second inclined surface facing the forward rotation direction of the ring gear, and the second inclined surface has a smaller inclination with respect to the flat portion of the surface excluding the ridge than the first inclined surface, the cable stripper according to claim 6.

8. A power tool comprising: a cable stripper according to any one of claims 1 to 7; and the rotary drive mechanism for driving the power transmission section of the cable stripper.

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