Cable stripper and electric tool
Patent Information
- Application Number
- PCT/JP2026/006594
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-28
- Filing Date
- 2026-02-24
- Publication Date
- 2026-10-01
Smart Images
Figure JP2026006594_01102026_PF_FP_ABST
Abstract
Description
Cable Stripper and Electric Power Tool
[0001] The present disclosure relates to a cable stripper for stripping cable insulation and an electric power tool.
[0002] Patent Document 1 discloses a cable stripper for stripping cable insulation. This cable stripper includes a plurality of cable holding blocks that hold a cable insulation, and a blade that strips the cable insulation on a downstream side of the plurality of cable holding blocks.
[0003] The plurality of cable holding blocks can move in a radial direction of the cable to change the holding position of the cable. Accordingly, the cable stripper can hold a plurality of types of cables having different outer diameters from each other, and for any of these cables, rotation of the cable stripper allows the blade to strip the insulation of the cable.
[0004] Incidentally, in this cable stripper, depending on the arrangement of the plurality of cable holding blocks and the thickness of the cable, the cable cannot be held straight, and the cable may be slightly inclined. In addition, the core of a cable is generally formed of a stranded wire formed by twisting a plurality of copper wires, which may expand somewhat when the insulation is stripped.
[0005] If the cable core expands while the cable is inclined as described above, when the cable stripper rotates, the cable core may get caught in a part of the cable stripper, which may cause a malfunction.
[0006] US Patent Application Publication No. 2017 / 0040783
[0007] An object of the present disclosure is to provide a cable stripper and an electric power tool that easily suppress jamming of a cable core.
[0008] A cable stripper according to one embodiment of the present disclosure comprises a rotary cutting section, a positioning section, and a jamming prevention structure. The rotary cutting section has an insertion hole into which a cable including a core and a sheath is inserted, and a repositionable cable holding section that holds the sheath of the cable inserted into the insertion hole. The rotary cutting section further has a repositionable blade section whose cutting edge is located in the insertion hole downstream of the cable holding section in the cable insertion direction. The positioning section allows for changing the positions of the cable holding section and the cutting edge when viewed in the insertion direction. The jamming prevention structure is configured to prevent jamming of the portion of the cable core that has been stripped of its sheath and is exposed.
[0009] An electric power tool according to one embodiment of the present disclosure comprises a cable stripper and a rotary drive mechanism for rotationally driving the rotary cutting portion of the cable stripper.
[0010] Figure 1 is a side view showing a cable stripper according to one embodiment of the present disclosure. Figure 2 is a side cross-sectional view showing a part of the cable stripper. Figure 3 is a side cross-sectional view showing another part of the cable stripper. Figure 4 is an exploded perspective view of a part of the cable stripper. Figure 5 is a side view showing a power tool equipped with the cable stripper. Figure 6 is a perspective view showing the cable holder, blade, and base of the cable stripper. Figure 7 is another perspective view showing the cable holder, blade, and base. Figure 8 is a front view showing the cable holder, blade, and base. Figure 9 is a perspective view showing the blade, base, and cable. Figure 10 is another perspective view showing the blade, base, and cable. Figure 11 is a side view showing the blade, base, and cable. Figure 12 is a front view showing the blade, base, and cable. Figure 13 is another side view showing the blade, base, and cable. Figure 14 is a perspective view showing the main components of the torque limiter included in the cable stripper described above.
[0011] (One Embodiment) 1. The cable stripper 1 of one embodiment shown in schematic diagrams 1 and 2 comprises a rotary cutting section 2, a position operation section 4, and a jamming prevention structure 5. The rotary cutting section 2 has an insertion hole 20 into which a cable 6 including a core material 60 and a sheath 61 is inserted, and a repositionable cable holding section 7 that holds the sheath 61 of the cable 6 inserted into the insertion hole 20. The rotary cutting section 2 further has a repositionable blade section 8 whose cutting edge 810 is located in the insertion hole 20 downstream of the cable holding section 7 in the insertion direction of the cable 6. The position operation section 4 allows for the operation of changing the positions of the cable holding section 7 and the cutting edge 810 when viewed in the insertion direction. The jamming prevention structure 5 is configured to prevent jamming of the portion of the core material 60 of the cable 6 that has been stripped of its sheath 61 and is exposed.
[0012] The power tool 10 in one embodiment shown in Figure 5 comprises the cable stripper 1 described above and a rotational drive mechanism 11 that rotationally drives the rotary cutting section 2 of the cable stripper 1.
[0013] In the cable stripper 1 and power tool 10 of the above-described embodiment, the anti-pinch structure 5 can prevent the exposed portion of the cable 6's core material 60 from getting caught in the cable after the sheath 61 has been stripped. Therefore, the cable stripper 1 and power tool 10 of the above embodiment make it easier to suppress the pinching of the cable 6's core material 60.
[0014] 2. Details Next, a cable stripper 1 and power tool 10 according to one embodiment will be described in detail with reference to Figures 1 to 14.
[0015] 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 61 of a cable 6, such as a power cable or optical cable, inserted inside it, by rotating relative to the cable 6, thereby exposing the core material 60, 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. In the following, with the insertion direction of the cable 6 as the reference, the insertion direction of the cable 6 (i.e., the right side in Figure 2) will be described as the downstream side of the axial direction D1, and the opposite side of the insertion direction of the cable 6 (i.e., the left side in Figure 2) will be described as the upstream side of the axial direction D1. The cable stripper 1 comprises a rotating cutting section 2, a power transmission section 3, a positioning section 4, and an anti-jamming structure 5.
[0016] 2-1-1. Rotary Cutting Section As shown in Figures 1 and 2, the rotary cutting section 2 has an insertion hole 20 into which the cable 6 is inserted, and a cable holding section 7 which is repositionable and holds the sheath 61 of the cable 6 inserted into the insertion hole 20. The rotary cutting section 2 further has a blade section 8 which is repositionable and whose cutting edge 810 is located in the insertion hole 20 downstream of the cable holding section 7 in the direction of cable 6 insertion, and a housing hole 9 which communicates with the downstream side of the insertion hole 20.
[0017] The rotary cutting unit 2 has a main body 2a with an insertion hole 20 on its inside, and a cylindrical part 2b with a housing hole 9 on its inside that communicates with the downstream side of the insertion hole 20 and is connected to the power transmission unit 3.
[0018] The main body portion 2a is detachably connected to the cylindrical portion 2b. The main body portion 2a is attached to the cylindrical portion 2b by a detachable fastener 12 (see Figure 4), such as a screw. In this embodiment, since the fastener 12 is a screw, the main body portion 2a is firmly attached to the cylindrical portion 2b.
[0019] As shown in Figures 2 and 4, the main body portion 2a includes a cylindrical housing portion 21 that forms the outer shell, a partition wall 22 that divides the space inside the housing portion 21 in the axial direction D1, and a cap portion 23 that closes the downstream end of the housing portion 21 in the axial direction D1.
[0020] A discharge port 210 is provided in the portion of the housing 21 that faces the blade portion 8. The discharge port 210 is provided in a notched shape, cut out from the downstream edge of the housing 21 in the axial direction D1 toward the upstream side.
[0021] The central part of the partition wall 22 is provided with a through hole 220 that penetrates the partition wall 22 in the axial direction D1, and an inner cylinder portion 221 that extends upstream in the axial direction D1 from the periphery of the through hole 220. Two protrusions 2210 that project in opposite directions are provided at the upstream end of the inner cylinder portion 221 in the axial direction D1. Fixing devices 45 such as screws that fix the position operating unit 4 are attached to the two protrusions 2210.
[0022] As shown in Figures 2, 4, and 7, the cap portion 23 has a plate-shaped closing wall 230 that faces the partition wall 22 and closes the downstream end of the housing portion 21, and a through hole 231 that penetrates the central part of the closing wall 230 in the axial direction D1. The cap portion 23 further has a surrounding wall 232 (see Figure 2) that protrudes upstream from the closing wall 230 in the axial direction D1 and is positioned to surround the through hole 231, and a cylindrical connecting tube portion 233 that protrudes downstream from the closing wall 230 in the axial direction D1 and is positioned to surround the through hole 231. The surrounding wall 232 is formed in a U-shape when viewed in the axial direction D1. The connecting tube portion 233 fits inside the upstream end of the cylindrical portion 2b in the axial direction D1. The connecting tube portion 233 is fixed to the cylindrical portion 2b by a fixing device 12.
[0023] Multiple cylindrical spacers 24 are placed between the partition wall 22 and the closing wall 230. The partition wall 22 and the closing wall 230 are fixed together with a space S1 formed between them by fasteners 25 such as screws that are passed through each spacer 24. The cable holding part 7, the blade part 8, and the base 13 that supports the blade part 8 are placed in the space S1.
[0024] As shown in Figures 4 and 7, the partition wall 22 and the closing wall 230 are each provided with a plurality of elongated guide holes 222 and 234 to guide the repositioning of the cable holding portion 7. The closing wall 230 is further provided with a plurality (specifically two) of elongated guide holes 235 to guide the repositioning of the base 13 that supports the blade portion 8. The plurality of guide holes 222 and 234 extend linearly in the same direction. The plurality of guide holes 235 extend parallel to each other.
[0025] As shown in Figure 4, the cable holding section 7 has a first holding member 7a and a second holding member 7b. The first holding member 7a and the second holding member 7b are members for holding the cable 6's sheath 61 between them, and are attached to the partition wall 22 and the closing wall 230 so as to move closer to or further apart from each other in one direction.
[0026] The direction in which the first retaining member 7a and the second retaining member 7b are movable is along the longitudinal direction of the guide holes 222 and 234. The first retaining member 7a and the second retaining member 7b are positioned to move closer to or further apart from the axis X1.
[0027] As shown in Figures 6 and 8, the first retaining member 7a and the second retaining member 7b each have a T-shaped base portion 70 when viewed in the axial direction D1, and a semi-cylindrical retaining portion 71 that protrudes upstream in the axial direction D1 from the base portion 70. The base portion 70 is provided with an arc-shaped notch 72, and the retaining portion 71 protrudes upstream in the axial direction D1 from the peripheral edge of the notch 72. Both ends of the retaining portion 71 in the circumferential direction protrude upstream in the axial direction D1 more than the central part in the circumferential direction.
[0028] The inner circumferential surface 720 surrounding the notch 72 of the base portion 70 and the inner circumferential surface 710 facing the axis X1 side of the holding portion 71 constitute the holding surface that holds the outer circumferential surface of the cable 6's sheath 61. The holding surfaces of the first holding member 7a and the second holding member 7b each have a pair of planar portions located at both ends in the circumferential direction (i.e., the rotational direction E1) and an arc-shaped curved portion located between the pair of planar portions. The pair of planar portions are longer upstream in the axial direction D1 than the curved portion.
[0029] Each of the base portions 70 of the retaining members 7a and 7b is provided with multiple (specifically three) through holes 73. A pin 74 is attached to each of the multiple through holes 73 so that it can be inserted through them.
[0030] The multiple pins 74 include four pins 74a and two pins 74b that protrude more upstream in the axial direction D1 than the four pins 74a. Each of the four pins 74a has both ends in the axial direction D1 contained within the guide holes 222 and 234 of the partition wall 22 and the closing wall 230.
[0031] In the base portions 70 of each of the retaining members 7a and 7b, cylindrical portions 75 extending toward the closing wall 230 are provided on the peripheral edges of the two through holes 73 located at both ends. A pin 74a is inserted through each of the four cylindrical portions 75. Between the peripheral edge of the remaining through hole 73 of the first retaining member 7a and the closing wall 230, a cylindrical member 76, which is a separate component from the first retaining member 7a, is positioned. The cylindrical member 76 functions as a spacer, similar to the cylindrical portions 75.
[0032] A pin 74b is inserted through the cylindrical member 76. The pin 74b inserted through the first retaining member 7a and the cylindrical member 76 has its downstream end in the axial direction D1 contained within the guide hole 234 of the closing wall 230. The pin 74b inserted through the second retaining member 7b has its downstream end in the axial direction D1 contained within the insertion hole 73 of the second retaining member 7b.
[0033] The upstream ends of the two pins 74b in the axial direction D1 are connected to the position control unit 4 (see Figure 2). This allows the position of the holding members 7a and 7b to be changed by operating the position control unit 4.
[0034] The base portion 70 of the second retaining member 7b is further provided with a through hole 78 through which a pin 77 is inserted. The pin 77 is used to connect the base portion 70 of the second retaining member 7b to the base 13.
[0035] As shown in Figure 6, the base 13 has a long groove 132 for housing the pin 77 and a plurality of protrusions 133 that are inserted into a plurality of guide holes 235 in the closing wall 230. As the pin 77 moves in the longitudinal direction of the long groove 132 and pushes against the pair of side walls surrounding the long groove 132, the base 13 moves in the longitudinal direction of the guide holes 235. As a result, the blade portion 8 attached to the base 13 can move in conjunction with the second holding member 7b. The thickness of the sheathing 61 differs for each diameter of the cable 6. Therefore, the amount of movement of the second holding member 7b and the base 13 is not the same. As shown in Figures 9 and 12, the long groove 132 is not a straight line, but is bent in stages while maintaining a constant width.
[0036] 2-1-2. Position Operation Section The position operation section 4 shown in Figures 2 and 4 allows for changing the position of the cable holding section 7 and the cutting edge 810 when viewed in the insertion direction. The position operation section 4 comprises a bottomed cylindrical rotating operation section 40 that forms the outer shell of the position operation section 4, a cam member 41, an annular seat member 42, and an annular fixing member 43.
[0037] The rotating operating section 40 has an annular bottom wall portion 400 and a cylindrical tube portion 401 extending downstream in the axial direction D1 from the outer peripheral edge of the bottom wall portion 400. Multiple anti-slip recesses 402 are provided on the outer peripheral surface of the tube portion 401 at intervals in the circumferential direction (i.e., the rotation direction E1).
[0038] The bottom wall portion 400 has a through hole 403 located in the center. The inner circumferential surface of the through hole 403 is provided with an annular recess 404 in which the fixing member 43 is housed, and a pair of projections 405 located downstream of the recess 404 in the axial direction D1 and projecting toward the axis X1. The bottom wall portion 400 is further provided with two pins (not shown) that project toward the downstream side in the axial direction D1 and are used for connection with the cam member 41.
[0039] The cam member 41 is located inside the rotating operating section 40. The cam member 41 is an annular plate when viewed in the axial direction D1. The cam member 41 has a fitting hole 410 located in the center, two slits 411 located between the fitting hole 410 and the outer edge of the cam member 41, and two fixing holes 412 into which fasteners 44 such as screws are fixed. The cam member 41 further has two fitting holes 413 into which two pins (not shown) protruding from the bottom wall 400 of the rotating operating section 40 are fitted.
[0040] Each of the two slits 411 extends in the circumferential direction (i.e., the rotational direction E1) of the cam member 41, and is positioned such that the distance from the axis X1 gradually increases from one end in the longitudinal direction to the other end in the longitudinal direction. The two slits 411 are positioned point-symmetrically with respect to the axis X1.
[0041] The cam member 41 is fixed to the bottom wall portion 400 of the rotary operating portion 40 via two fasteners 44 and two pins. As a result, the cam member 41 rotates integrally with the rotary operating portion 40.
[0042] The annular sheet member 42 is made of metal. The sheet member 42 blocks some of the guide holes 222 of the partition wall 22, making it difficult for debris to enter the cam member 41. The sheet member 42 has a fitting hole 420 located in the center and two through holes 421 located on either side of the fitting hole 420. The sheet member 42 is attached to the partition wall 22 along the surface of the partition wall 22 facing upstream in the axial direction D1, such that the two through holes 421 are aligned with the two guide holes 222 of the partition wall 22 in the axial direction D1.
[0043] The annular fixing member 43 is a member for rotatably attaching the rotating operation unit 40 to the main body 2a of the rotating cutting unit 2. The fixing member 43 has a central insertion hole 430 and two fixing holes 431 through which the fixing device 45 is inserted. The fixing member 43 also serves as a guide for inserting the cable 6.
[0044] The position operation unit 4 is combined with the main body 2a of the rotary cutting unit 2 such that the inner cylindrical portion 221 of the main body 2a of the rotary cutting unit 2 is inserted through the insertion hole 403 of the bottom wall 400 of the rotary operation unit 40, the fitting hole 410 of the cam member 41, and the fitting hole 420 of the sheet member 42. In this state, a fixing member 45 is driven into a fixing member 43 disposed in the recess 404 of the bottom wall 400 of the rotary operation unit 40, and the fixing member 45 is fixed to the two protrusions 2210 of the inner cylindrical portion 221, whereby the position operation unit 4 is rotatably attached to the rotary cutting unit 2.
[0045] In a state where the position operation unit 4 is attached to the rotary cutting unit 2, the rotary operation unit 40 is held by the fixing member 43 and is rotatable relative to the main body 2a of the rotary cutting unit 2. The protrusion 2210 of the inner cylindrical portion 221 of the main body 2a is located between the pair of protrusions 405 of the rotary operation unit 40 in the circumferential direction. Thereby, the rotary operation unit 40 can be rotationally operated within a certain range (specifically, the range from the position where the protrusion 405 abuts against one protrusion 2210 to the position where it abuts against the other protrusion 2210).
[0046] In a state where the position operation unit 4 is attached to the rotary cutting unit 2, the cam member 41 is located on the downstream side in the axial direction D1 of the inner cylindrical portion 221 relative to the pair of protrusions 2210, and is rotatable integrally with the rotary operation unit 40.
[0047] In each of the two slits 411 of the cam member 41, an upstream portion in the axial direction D1 of the two pins 74b of the cable holding unit 7 is inserted. Thereby, when the rotary operation unit 40 is rotationally operated, the distance of the two pins 74b from the axis X1 can be changed by the two slits 411 of the cam member 41 that rotates integrally with the rotary operation unit 40. As a result, the distance of the pair of holding members 7a and 7b, which move integrally with the two pins 74b, from the axis X1 can be changed. Thereby, the interval between the holding surfaces of the pair of holding members 7a and 7b can be adjusted to match the diameter of the outer peripheral surface of the coating 61 of the cable 6.
[0048] By rotationally operating the rotary operation portion 40, the distance from the axis X1 of the pair of holding members 7a and 7b can be varied in a plurality of steps in accordance with the thickness of the cable 6. On the axially downstream side surface of the bottom wall portion 400 of the rotary operation portion 40, a plurality of recesses are provided at predetermined intervals in the rotational direction E1 (30° intervals in the present embodiment) respectively at portions facing the two slits 411 of the cam member 41.
[0049] A click pin 74c biased toward the bottom wall portion 400 is inserted into an axially D1 upstream end of one of the two pins 74b. Each time the rotary operation portion 40 is rotated by 30°, the click pin 74c fits into one of the plurality of recesses, thereby enabling positioning of the rotary operation portion 40. Accordingly, the distance from the axis X1 of the pair of holding members 7a and 7b can be varied in a plurality of steps.
[0050] By applying a force of not less than a predetermined value to the positioned rotary operation portion 40 to perform a rotation operation, the state in which the click pin 74c is fitted into one recess can be released, and the rotary operation portion 40 can be rotated to a position where the click pin 74c fits into the next recess.
[0051] A click pin 74c may be provided on each of the two pins 74b. In this case, the click feeling can be enhanced when operating the rotary operation portion 40.
[0052] In a state where the position operation portion 4 is attached to the rotary cutting portion 2, the holding portions 71 of the pair of holding members 7a and 7b are arranged inside the insertion hole 430 of the fixing member 43 and the inner cylindrical portion 221 of the main body portion 2a. The axially D1 upstream end of each holding portion 71 is located within the insertion hole 430 of the fixing member 43. The cable 6 is inserted into a space between the holding portions 71 of the pair of holding members 7a and 7b.
[0053] As shown in Fig. 8, the blade portion 8 is position-changeable, and is configured such that a blade edge 810 is located inside the insertion hole 20 on a downstream side in the insertion direction of the cable 6 relative to the cable holding portion 7. The blade portion 8 is fixed to the pedestal 13, and moves in conjunction with the movement of the second holding member 7b.
[0054] Figures 9 to 13 show the positional relationship between the blade 8, the base 13, and the cable 6 when the cable 6's sheath 61 is held by the holding portions 71 of the pair of holding members 7a and 7b.
[0055] As shown in Figures 9 and 11, the blade portion 8 has a plate-shaped base portion 80 extending in one direction, and a blade body portion 81 that protrudes from the first longitudinal end of the base portion 80 (more specifically, the end closer to the axis X1) to one side in the thickness direction of the base portion 80 (more specifically, the side opposite to the axis X1).
[0056] The base portion 80 is fixed to the pedestal 13 at its second end, which is the end opposite to the first end in the longitudinal direction of the base portion 80, by fasteners such as screws (not shown). The second end of the base portion 80 is provided with an insertion hole 800 through which the fasteners are inserted.
[0057] The first end of the base portion 80 is located in a range that overlaps with the sheathing 61 of the cable 6 in the axial direction D1. Hereinafter, the first end side of the longitudinal direction of the base portion 80 will be referred to as the tip side, and the opposite side as the base side.
[0058] The tip half of the blade body 81 is the cutting edge 810. As shown in Figure 11, the cutting edge 810 has a shorter axial length D1 towards the tip. The surface 810a on the upstream side of the axial length D1 (i.e., the upper side in Figure 11) of the cutting edge 810 is inclined so that the part closer to the axis X1 is located further upstream in the axial length D1, as shown in Figures 11 and 13.
[0059] The surface 811a on the upstream side (i.e., the upper side in Figure 11) of the base portion 811, which is the base half of the blade body portion 811, is inclined so that the portion on the base end side (left side in Figure 11) is located further downstream in the axial direction D1. This surface 811a is located further downstream in the axial direction D1 than the surface 810a of the cutting edge 810, making it less likely to come into contact with the downstream end face of the cable sheath 61 of the cable 6. In other words, the surface on the upstream side in the axial direction D1 of the blade body portion 81 of the blade portion 8 is provided with a recess to avoid contact with the cable sheath 61 of the cable 6.
[0060] The tip end 801 of the base portion 80 is less thick towards the tip. The tip surface 802 of the base portion 80 is inclined such that the downstream portion in the axial direction D1 is located closer to the base end. The tip surface 802 includes a first portion 802a, which is the upstream portion of the tip surface 802 in the axial direction D1; a second portion 802b, which is the middle portion of the tip surface 802 in the axial direction D1; and a third portion 802c, which is the downstream portion of the tip surface 802 in the axial direction D1.
[0061] The first portion 802a is approximately parallel to the axial direction D1. The second portion 802b is inclined with respect to the axial direction D1. The third portion 802c is inclined with respect to the axial direction D1 at a larger angle than the second portion 802b. As a result, the tip surface 802 is inclined such that the portion downstream of the axial direction D1 is located closer to the base end.
[0062] The second portion 802b and the third portion 802c, which are recessed toward the base side compared to the first portion 802a, constitute a pinching prevention structure 5 that prevents pinching of the portion of the core material 60 of the cable 6 that has been stripped of its covering 61 and is exposed.
[0063] Of the tip end portion 801 of the base portion 80, the outer surface 801a facing away from the axis X1 is an inclined surface that is inclined so that the tip portion is closer to the axis X1. As shown in Figures 10 and 13, of the tip end portion 801 of the base portion 80, the tip edge of the inner surface 801b facing the axis X1 is provided with an inclined surface 801c in the portion continuous with the second portion 802b and the third portion 802c, which is inclined so that the tip portion is further away from the axis X1. Of the inner surface 801b, the remaining portion excluding the inclined surface 801c is flush with the surface facing the axis X1 of the remaining portion of the base portion 80 excluding the tip end portion 801.
[0064] As the cable 6 moves downstream in the axial direction D1, the cutting edge 810 of the blade portion 8, which rotates relative to the cable 6, strikes the downstream end face of the cable 6's sheath 61 in the axial direction D1, forming a spiral cut in the sheath 61. At this time, the cut sheath 61 is sent away from the core material 60 by the cutting edge 810 and the tip end 801 of the base portion 80, and is discharged from the discharge port 210.
[0065] As shown in Figure 9, the base 13 has a main body 130 to which the blade 8 is fixed, and a guide portion 131 that protrudes from the main body 130 toward the tip of the blade 8. The guide portion 131 is located closer to the axis X1 than the main body 130, and a part of it is located inside the insertion hole 20.
[0066] A long groove 132 is provided on the upstream side of the main body 130 in the axial direction D1, and two protrusions 133 are provided on the downstream side of the main body 130 in the axial direction D1. The blade portion 8 is fixed to the middle portion of the main body 130 in the axial direction D1 by a fixing device (not shown). A mounting groove 134 is provided on the side of the main body 130 facing away from the axis X1, and the blade portion 8 is fixed to this mounting groove 134.
[0067] The guide portion 131 is the part of the cable 6 core material 60 that has had its sheathing 61 stripped off and is exposed, and guides it away from the cutting edge 810. The surface 135 of the guide portion 131 facing upstream in the axial direction D1 is located downstream in the axial direction D1 from the cutting edge 810.
[0068] As shown in Figures 10 and 12, the surface 135 of the guide portion 131 facing upstream in the axial direction D1 includes a first surface 135a and a second surface 135b, both located at different positions in the axial direction D1. The first surface 135a is located downstream of the cutting edge 810 and upstream of the downstream end of the base portion 80 in the axial direction D1. The second surface 135b is located adjacent to the downstream side of the base portion 80 in the axial direction D1.
[0069] The ends of the first surface 135a and the second surface 135b on the axis X1 side are provided with inclined surfaces 136 and 137, respectively, which are inclined so that the portion closer to the axis X1 is located downstream in the axial direction D1. The inclined surface 136 of the first surface 135a includes a portion 136a that extends in a straight line when viewed in the axial direction D1, and a curved portion 136b that curves in an arc when viewed in the axial direction D1. The curved portion 136b is provided so as to follow the circumferential direction (i.e., the rotational direction E1) centered on the axis X1.
[0070] The inclined surface 137 of the second surface 135b is provided so as to follow the circumferential direction (i.e., the rotational direction E1) centered on the axis X1. The inclined surface 137 is located on the downstream side of the axial direction D1 of the edge of the cutting edge 810 on the axis X1 side when viewed in the axial direction D1.
[0071] The inclined surfaces 136 and 137 function as guide portions that guide the core material 60 of the cable 6 away from the cutting edge 810. In other words, the inclined surfaces 136 and 137 of the guide portion 131 constitute a jamming prevention structure 5 that prevents jamming of the portion of the core material 60 of the cable 6 that has been stripped of its covering 61 and is exposed.
[0072] As shown in Figures 1, 2, and 4, the cylindrical portion 2b is cylindrical and extends in the axial direction D1. The power transmission unit 3 is connected to the downstream end of the cylindrical portion 2b in the axial direction D1. The cylindrical portion 2b rotates together with the main body portion 2a due to the rotational force transmitted from the power transmission unit 3.
[0073] A stopper 14 is attached to the cylindrical portion 2b so as to be movable in the axial direction (i.e., axial direction D1) of the cylindrical portion 2b, receiving the tip surface of the core material 60 of the cable 6 (i.e., the downstream end surface in the axial direction D1). The stopper 14 receives the tip surface of the core material 60 after the coating 61 has been stripped off (i.e., not covered by the coating 61). The space inside the cylindrical portion 2b, upstream of the stopper 14 in the axial direction D1, is the housing hole 9. The core material 60 of the tip of the cable 6 that is not covered by the coating 61 is housed in the housing hole 9.
[0074] The outer circumferential surface 26 of the cylindrical portion 2b has two elongated holes 260 and 261 extending in the axial direction (i.e., axial direction D1) of the cylindrical portion 2b. Each of the two elongated holes 260 and 261 is provided along the entire length of the axial direction D1 in the remaining portion of the cylindrical portion 2b, excluding both ends in the axial direction D1. Each of the elongated holes 260 and 261 is provided in a part of the circumferential direction (i.e., rotational direction E1) of the outer circumferential surface 26 of the cylindrical portion 2b. Each of the elongated holes 260 and 261 penetrates the cylindrical portion 2b inward and outward (i.e., in a direction perpendicular to the axis X1). The elongated holes 260 and 261 are positioned opposite each other, straddling the axis X1. A scale (not shown) indicating the stripping length of the cable 6 is provided around the elongated hole 261 on the outer circumferential surface 26. The outer circumferential surface 26 of the cylindrical portion 2b further has an insertion hole 262 through which the fastener 12 is inserted.
[0075] Although not shown in the figures, the portion of the outer circumferential surface 26 of the cylindrical portion 2b surrounding the elongated hole 260 is an inclined surface that is positioned further away from the central axis (i.e., axis X1) of the cylindrical portion 2b 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.
[0076] The stopper 14 integrally comprises a stopper body 140 located within the housing hole 9 and movable in the axial direction of the cylindrical portion 2b (i.e., axial direction D1), and an operating portion 141 located outside the cylindrical portion 2b and movable in a direction perpendicular to the axial direction of the cylindrical portion 2b.
[0077] The stopper body 140 is substantially cylindrical. The stopper body 140 has a small diameter portion 140a and a large diameter portion 140b. The diameter of the large diameter portion 140b is the same as or approximately the same as the diameter of the inner circumferential surface of the cylindrical portion 2b. The small diameter portion 140a has a smaller diameter than the large diameter portion 140b. The large diameter portion 140b is continuous with the small diameter portion 140a on the downstream side in the axial direction D1. The small diameter portion 140a and the large diameter portion 140b are provided concentrically. The upstream end face of the small diameter portion 140a in the axial direction D1 is the surface that receives the tip surface of the core material 60 of the cable 6. The large diameter portion 140b is provided with a mounting hole 142 that opens in a direction perpendicular to the axis X1. The small diameter portion 140a and the large diameter portion 140b are provided with a recess 143 that opens toward the downstream side in the axial direction D1. The mounting hole 142 is connected to the recess 143.
[0078] The operating unit 141 includes an operating unit body 1410 that is provided in the shape of a disc, and a connecting shaft 1411 that extends from the operating unit body 1410 toward the stopper body 140.
[0079] Multiple anti-slip grooves 1412 are provided on the outer circumferential surface of the operating unit body 1410. Multiple grooves 1412 are provided on the outer circumferential surface of the operating unit body 1410 so as to extend around its entire circumference. The connecting shaft 1411 has screw threads on its outer circumferential surface and is mounted in the mounting hole 142 of the stopper body 140 so as to be able to move back and forth.
[0080] The operating unit 141 is movable between a fixed position where the operating unit body 1410 is in contact with the edge of the elongated hole 260 on the outer circumferential surface 26 of the cylindrical portion 2b, and an unfixed position where the operating unit body 1410 is located away from the edge of the hole, by rotating the operating unit body 1410.
[0081] When the operating unit body 1410 is in a fixed position, the wall of the cylindrical portion 2b is sandwiched between the operating unit body 1410 and the stopper body 140, preventing the stopper body 140 from moving in the axial direction D1, and thus fixing the position of the stopper body 140. When the operating unit body 1410 is in an unfixed position, the stopper body 140 is movable in the axial direction D1.
[0082] Of the outer circumferential surface 26 of the cylindrical portion 2b, the portion around the elongated hole 260 is an inclined surface that is positioned further from the central axis of the cylindrical portion 2b as it approaches the power transmission portion 3. Therefore, even if the core material 60 of the cable 6 collides with the stopper body 140 when the operating unit body 1410 is in a fixed position, the inclined surface can prevent the operating unit body 1410 from shifting downstream in the axial direction D1. This prevents the stopper body 140 from shifting position.
[0083] 2-1-3. Power Transmission Section The power transmission section 3 shown in Figures 1 and 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 6. 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.
[0084] The connection part 30 is detachably connected to the rotary drive mechanism 11. The connection part 30 includes 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.
[0085] The power transmission unit 3 further includes an output-side connection part 31 connected to the downstream end of the cylindrical portion 2b 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 2b in the axial direction D1 and rotates integrally with the cylindrical portion 2b. The output-side connection part 31 is fixed to the tip of the output shaft 32 of the power transmission unit 3 via a fastener 33 such as a screw and rotates around the axis X1. The head of the fastener 33 can be inserted into the recess 143 of the stopper 14 (see Figure 2), thereby allowing the stopper 14 to move downstream in the axial direction D1 to a position where it overlaps with the head of the fastener 33.
[0086] The power transmission unit 3 further includes a reduction mechanism 15 that reduces the rotational force of the rotary drive mechanism 11 and transmits it to the rotary cutting unit 2. The reduction ratio of the reduction mechanism 15 is, for example, in the range of 1 / 10 to 1 / 20.
[0087] The reduction gear mechanism 15 is composed of a planetary gear mechanism and includes a ring gear, a sun gear, and planet gears. Since a conventionally known structure can be used for the planetary gear mechanism, a detailed explanation is omitted.
[0088] By providing the power transmission unit 3 with a reduction mechanism 15 having a reduction ratio of 1 / 10 to 1 / 20, the rotational speed transmitted from the rotational drive mechanism 11 to the output shaft 32 can be reduced to an appropriate rotational speed (for example, 150 rpm), regardless of whether the rotational drive mechanism 11 is an impact driver mechanism or a drill driver mechanism.
[0089] The power transmission unit 3 further includes a torque limiter 16. The torque limiter 16 stops 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.
[0090] As shown in Figures 3 and 14, the torque limiter 16 comprises a ring gear 160 and a spherical body 161 that is spring-biased and presses against one axial surface 160a of the ring gear 160. The ring gear 160 constitutes part of the reduction mechanism 15. The spherical body 161 is pressed against the ring gear 160 by the biasing force of a coil spring 163. The spherical body 161 may also be spring-biased by a disc spring, in which case the axial length D1 of the power transmission unit 3 can be reduced.
[0091] One surface 160a has peaks 162 that the spherical body 161 catches on when the ring gear 160 rotates in the forward and reverse directions. The peaks 162 include a first inclined surface 162a facing the reverse rotation direction of the ring gear 160 and a second inclined surface 162b facing the forward rotation direction of the ring gear 160. The inclination of the second inclined surface 162b with respect to the flat portion, which is the remaining part of the surface 160a excluding the peaks 162, is smaller than that of the first inclined surface 162a. One surface 160a has a plurality of peaks 162 that are spaced apart in the circumferential direction of the ring gear 160. The portion of the surface 160a between two circumferentially adjacent peaks 162 is the flat portion.
[0092] When the bit section 300 connected to the rotary drive mechanism 11 rotates in the forward direction, the ring gear 160, which meshes with the sun gear (not shown) of the bit section 300 via multiple gears, rotates in the reverse direction. When the bit section 300 connected to the rotary drive mechanism 11 rotates in the reverse direction, the ring gear 160, which meshes with the sun gear (not shown) of the bit section 300 via multiple gears, rotates in the forward direction.
[0093] The first inclined surface 162a is the surface that the spherical body 161 strikes when the bit portion 300 rotates in the forward direction and the ring gear 160 rotates in the reverse direction. The second inclined surface 162b is the surface that the spherical body 161 strikes when the bit portion 300 rotates in the reverse direction and the ring gear 160 rotates in the forward direction.
[0094] Since the second inclined surface 162b has a smaller inclination than the first inclined surface 162a, the clutch torque when the rotary drive mechanism 11 rotates in reverse can be reduced. As a result, even if the coating 61 becomes jammed after cutting when the rotary cutting section 2 is rotated in reverse, excessive torque cannot be applied to the cutting edge 810 of the blade section 8.
[0095] Furthermore, when the rotary cutting unit 2 is rotated in the forward direction, if a torque exceeding a predetermined value is generated between the cutting edge 810 of the blade 8 and the coating 61, the spherical body 161 of the torque limiter 16 will move over the first inclined surface 162a of the peak 162 of the ring gear 160. This stops the transmission of the rotational force of the rotary drive mechanism 11 to the rotary cutting unit 2.
[0096] The power transmission unit 3 further includes a hand-tightening mechanism 17. The hand-tightening mechanism 17 is a mechanism that, when the rotary cutting unit 2 is grasped by hand and rotated in the forward direction, releases the connection between the rotary cutting unit 2 and the rotary drive mechanism 11, thereby preventing the rotational force of the rotary cutting unit 2 from being transmitted to the rotary drive mechanism 11. The power transmission unit 3 does not necessarily have to have the hand-tightening mechanism 17, in which case the axial length D1 of the power transmission unit 3 can be reduced.
[0097] 2-2. Power Tools The power tool 10 shown in Figure 5 comprises the cable stripper 1 described above and a rotational drive mechanism 11 that rotates the rotating cutting section 2 of the cable stripper 1.
[0098] 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.
[0099] The power tool 10 includes a rotary drive mechanism 11 which comprises a chuck (i.e., a bit mounting section) on which tools such as screwdriver bits and sockets can be detachably attached, and a motor (not shown) that rotates the chuck.
[0100] The power tool 10 further includes a clutch 18 for adjusting the clamping force, a housing 19, a trigger switch 27, a forward / reverse selector switch 28, and a speed change switch 29, etc. The housing 19 includes a grip 190 and a battery mounting section 191. The power tool 10 can drive the motor and rotate the chuck by attaching a battery (not shown) to the battery mounting section 191. The power tool 10 may further include a power cord connected to a commercial power source.
[0101] The bit portion 300 of the cable stripper 1 is attached to the chuck. The bit portion 300 can be removed from the chuck by pressing the pair of release operation parts 301.
[0102] In the power tool 10, by selecting forward rotation with the forward / reverse selector switch 28 and pressing the trigger switch 27 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 15 and transmitted to the output shaft 32, and the reduced rotational force is transmitted from the output shaft 32 to the cylindrical portion 2b and the main body portion 2a (i.e., the rotating cutting portion 2) via the output side connection portion 31. As a result, the rotating cutting portion 2 can be rotated forward at a reduced rotational speed, and the cutting edge 810 of the blade portion 8 of the rotating cutting portion 2 can cut the insulation 61 at the tip of the cable 6 and peel the insulation 61 from the core material 60. The cut insulation 61 is discharged from the discharge port 210. When the core material 60, from which the insulation 61 has been removed, moves downstream in the axial direction D1 and hits the end face of the stopper body 140, the cable 6 can no longer move downstream in the axial direction D1. In this state, a portion of the coating 61 in the axial direction D1 is cut by the cutting edge 810 over the entire circumference in the rotational direction E1, and the peeled coating 61 separates from the coating 61 upstream of that point in the axial direction D1.
[0103] 3. Effects and Effects As described above, the cable stripper 1 allows the outer surface of the sheathing 61 of cables of various thicknesses to be held by the holding parts 71 of the holding members 7a and 7b by operating the positioning part 4 according to the thickness of the cable 6. In this state, by rotating the rotary cutting part 2 while inserting the cable 6 downstream in the axial direction D1, the cutting edge 810 of the blade part 8 makes a cut in the sheathing 61 of the cable 6, and the sheathing 61 can be peeled off from the core material 60.
[0104] In the cable stripper 1, if the core material 60 exposed after the insulation 61 is stripped becomes tilted relative to the axis X1, or if the strands constituting the core material 60 spread out, the core material 60 can be guided toward the axis X1 by the inclined surfaces 136 and 137 of the guide portion 131 (see Figure 10).
[0105] Furthermore, in the cable stripper 1, a recess is provided in the downstream portion of the tip surface 802 of the base portion 80 of the blade portion 8 in the axial direction D1 (i.e., a second portion 802b and a third portion 802c that are set back from the first portion 802a), so that the core material 60 is less likely to come into contact with the blade portion 8 (see Figure 9).
[0106] Therefore, the cable stripper 1 can prevent the core material 60, which is exposed after the insulation 61 is stripped, from coming into contact with the blade portion 8 and getting jammed. As a result, the cable stripper 1 can prevent the blade portion 8 and the core material 60 from coming into contact and causing damage to either the blade portion 8 or the core material 60.
[0107] Furthermore, in the cable stripper 1, the surface 811a of the base portion 811 of the blade body portion 81 of the blade portion 8 that is continuous with the cutting edge 810 (i.e., the base portion 811) is located downstream of the surface 810a of the cutting edge 810 that is facing upstream in the axial direction D1 (see Figure 9). Therefore, in the cable stripper 1, when the cutting edge 810 contacts the downstream end face of the cable sheath 61 in the axial direction D1, other parts of the blade portion 8 other than the cutting edge 810 are prevented from contacting the same end face of the sheath 61, thereby preventing the other parts from hindering the insertion of the cable 6.
[0108] Furthermore, in the cable stripper 1, the curved portion 136b of the inclined surface 136 and the inclined surface 137 located downstream of the curved portion 136b in the axial direction D1 allow the core material 60 of the cable 6 to be guided away from the cutting edge 810 in two stages (see Figures 10 and 12). Therefore, the cable stripper 1 makes it easier to prevent contact between the core material 60 of the cable 6 and the cutting edge 810.
[0109] Furthermore, in the cable stripper 1, the tip surface 802 of the base portion 80 of the blade portion 8 is positioned further back towards the downstream portion in the axial direction D1 (see Figure 11). Therefore, in the cable stripper 1, although the core material 60 is prone to shifting from the axis X1 in portions where the axial distance D1 from the cutting edge 810 is long, it is easier to prevent contact between the tip surface 802 of the blade portion 8 and the core material 60.
[0110] Furthermore, in the cable stripper 1, the reduction mechanism 15 of the power transmission unit 3 reduces the rotational force of the rotary drive mechanism 11 and transmits it to the rotary cutting unit 2 of the cable stripper 1.
[0111] 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 6's insulation 61 to be stripped at a manageable rotation speed. This makes the cable stripper 1 easier to use, and also prevents the stripped insulation 61 from flying off forcefully.
[0112] 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.
[0113] Furthermore, in the cable stripper 1, if the torque applied to the rotary cutting section 2 exceeds a predetermined value, the torque limiter 16 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 810 from hitting the core material 60 of the cable 6, thereby preventing damage to the core material 60 or chipping of the cutting edge 810.
[0114] 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.
[0115] 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.
[0116] The anti-pinch structure 5 is not limited to the structures shown in Figures 9 to 13, and is not limited to any structure configured to prevent pinching of the portion of the cable 60 core material 60 that has been stripped of its covering 61 and is exposed.
[0117] The guide portion 131 is not limited to the structures shown in Figures 9 to 13, as long as it protrudes into the insertion hole 20 downstream of the cutting edge 810 and guides the core material 60 so as to avoid contact between the core material 60 and the cutting edge 8.
[0118] The recess provided in the downstream portion of the cutting edge 810 of the blade portion 8 (i.e., the tip end 801 of the base portion 80) is not limited to the structure shown in Figures 9 to 13. For example, the tip surface 802 may be provided in a stepped manner, with the first portion 802a and the second portion 802b being continuous at a right angle or nearly a right angle, and the second portion 802b and the third portion 802c being continuous at a right angle or nearly a right angle.
[0119] The blade portion 8 is provided on the surface facing the upstream side in the insertion direction of the cable 6, and does not necessarily have a recess to avoid contact with the covering 61 (i.e., the surface 811a of the base portion 811 that is set back from the surface 810a of the blade tip 810 of the blade body portion 81). The surfaces 810a and 811a of the blade body portion 81 facing the upstream side in the axial direction D1 of the blade tip 810 and base portion 811 may be provided flush with each other.
[0120] The bottomed cylindrical rotating operating section 40 is not limited to the structure shown in Figure 2, etc. The cylindrical section 401 may be provided so as to extend upstream from the bottom wall section 400 in the axial direction D1.
[0121] The cable stripper 1 does not necessarily have a power transmission unit 3, and may be configured to strip the insulation 61 of the cable 6 by manually rotating the rotary cutting unit 2.
[0122] The power transmission unit 3 does not necessarily have to have a reduction mechanism 15.
[0123] The reduction mechanism 15 may have a plurality (for example, two) of reduction sections with different reduction ratios. In this case, the power transmission unit 3 may further have a gear shift mechanism that can switch the reduction ratio of the reduction mechanism 15. The gear shift mechanism preferably has an operating section for switching between the functional reduction sections among the plurality of reduction sections. Furthermore, it is preferable that the operating section is provided so as to protrude from the outer shell of the power transmission unit 3.
[0124] The rotating cutting section 2 of the cable stripper 1 may have multiple types of main body sections 2a to match the thickness of the cable 6.
[0125] The rotary cutting section 2 may be formed by integrally molding the main body section 2a and the cylindrical section 2b.
[0126] The stopper 14 does not necessarily have an operating part 141, and may be fixed immovably on the cylindrical part 2b. In this case, the cylindrical part 2b does not necessarily have an elongated hole 260. In other words, the cable stripper 1 may be used to strip the insulation 61 of the cable 6 by a predetermined length.
[0127] The outer circumferential surface 26 of the cylindrical portion 2b does not have to be an inclined surface that is inclined so that the portion closer to the power transmission portion 3 is located further away from the central axis of the cylindrical portion 2b. The outer circumferential surface 26 of the cylindrical portion 2b may have a constant cross-sectional area over its entire length in the axial direction D1.
[0128] The power transmission unit 3 does not necessarily have a torque limiter 16. Also, the first inclined surface 162a and the second inclined surface 162b of the peaks 162 of the ring gear 160 of the torque limiter 16 may have the same inclination.
[0129] The torque limiter 16 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, and is not limited to the structure described above.
[0130] 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.
[0131] The blade portion 8 may be mounted to the base 13 in an angle-adjustable manner, thereby allowing the angle at which the blade tip 810 bites into the sheath 61 of the cable 6 to be changed.
[0132] 5. Summary As described above in one embodiment and its modified form, the cable stripper (1) of the first embodiment has the following configuration.
[0133] In other words, the cable stripper (1) of the first embodiment comprises a rotary cutting section (2), a positioning section (4), and an anti-jamming structure (5). The rotary cutting section (2) has an insertion hole (20) into which a cable (6) including a core material (60) and a sheath (61) is inserted, and a repositionable cable holding section (7) that holds the sheath (61) of the cable (6) inserted into the insertion hole (20). The rotary cutting section (2) further has a repositionable blade section (8) whose cutting edge (810) is located in the insertion hole (20) downstream of the cable holding section (7) in the insertion direction of the cable (6). The positioning section (4) allows for the operation of changing the positions of the cable holding section (7) and the cutting edge (810) when viewed in the insertion direction. The anti-jamming structure (5) is configured to prevent jamming of the portion of the core material (60) of the cable (6) that has been stripped of its sheath (61) and is exposed.
[0134] In the first embodiment of the cable stripper (1) having the above configuration, the anti-pinch structure (5) can prevent pinching of the exposed portion of the cable (6) core material (60) after the sheath (61) has been stripped. Therefore, the first embodiment of the cable stripper (1) makes it easier to suppress pinching of the cable (6) core material (60).
[0135] 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.
[0136] In other words, in the cable stripper (1) of the second embodiment, the anti-jamming structure (5) includes a guide portion (131) that protrudes into the insertion hole (20) downstream of the cutting edge (810) and guides the core material (60) away from the cutting edge (810).
[0137] In the second embodiment of the cable stripper (1) having the above configuration, the core material (60) of the cable (6) can be guided by the guide portion (131) in a direction away from the cutting edge (810), making it easier to suppress the core material (60) of the cable (6) from getting caught.
[0138] Furthermore, as described above in one embodiment and its modified form, the cable stripper (1) of the third embodiment additionally includes the following configuration in addition to the configuration of the first or second embodiment.
[0139] In other words, in the third embodiment of the cable stripper (1), the anti-jamming structure (5) is provided in the portion of the blade (8) downstream of the cutting edge (810) (i.e., the tip end 801 of the base portion 80) and includes a recess to avoid contact with the core material (60) (i.e., a second portion 802b and a third portion 802c that are set back from the first portion 802a).
[0140] In the third embodiment of the cable stripper (1) having the above configuration, the core material (60) of the cable (6) can be prevented from coming into contact with the part of the blade (8) downstream of the cutting edge (810), making it easier to prevent the core material (60) of the cable (6) from getting caught in the blade.
[0141] 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.
[0142] In other words, in the fourth embodiment of the cable stripper (1), the blade portion (8) is provided on the surface facing the upstream side in the insertion direction of the cable (6) and has a recess (i.e., the surface 811a of the base portion 811 that is set back from the surface 810a of the cutting edge 810 of the blade body portion 811) to avoid contact with the covering (61).
[0143] In the fourth embodiment of the cable stripper (1) having the above configuration, the recess prevents the cable (6) sheath (61) from coming into contact with a part of the blade portion (8) other than the cutting edge (810), thereby preventing the cable (6) from entering.
[0144] 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 any one of the first to fourth embodiments.
[0145] In other words, in the fifth embodiment of the cable stripper (1), the rotary cutting section (2) further comprises a housing section (21) that constitutes the outer shell of the rotary cutting section (2). The positioning section (4) has a bottomed cylindrical rotary operating section (40). The rotary operating section (40) has an annular bottom wall section (400) located on the upstream side in the direction of insertion of the cable (6) relative to the housing section (21), and a cylindrical section (401) extending from the bottom wall section (400) so as to overlap the outer circumferential surface of the housing section (21).
[0146] In the fifth embodiment of the cable stripper (1) having the above configuration, the bottomed cylindrical rotating operating part (40) of the position operating part (4) is provided so as to overlap the outer circumferential surface of the housing part (21) of the rotating cutting part (2). Therefore, in the fifth embodiment of the cable stripper (1), the cable stripper (1) having the position operating part (4) and the rotating cutting part (2) can be compactly provided in the direction of insertion of the cable (6). In addition, in the fifth embodiment of the cable stripper (1), the cylindrical part (401) does not get in the way when viewing the insertion hole (20) of the rotating cutting part (2) through the annular bottom wall part (400), making it easy to insert the cable (6) into the insertion hole (20).
[0147] 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.
[0148] In other words, the cable stripper (1) of the sixth embodiment further comprises a power transmission unit (3). The power transmission unit (3) has a connection unit (30) that can be connected to a rotary drive mechanism (11). The power transmission unit (3) transmits the rotational force of the rotary drive mechanism (11) to the rotary cutting unit (2), causing the rotary cutting unit (2) to rotate relative to the cable (6). The power transmission unit (3) has a reduction mechanism (15) that reduces the rotational force of the rotary drive mechanism (11) and transmits it to the rotary cutting unit (2).
[0149] In the sixth embodiment of the cable stripper (1) having the above configuration, the connection part (30) of the power transmission part (3) is connected to the rotary drive mechanism (11), so that the rotary cutting part (2) is rotated by the rotational force of the rotary drive mechanism (11) and the sheath (61) of the cable (6) can be cut. In the sixth embodiment of the cable stripper (1), the rotational force of the rotary drive mechanism (11) can be reduced by the reduction mechanism (15) and transmitted to the rotary cutting part (2). Therefore, in the sixth embodiment of the cable stripper (1), it is easier to reduce the rotational speed of the rotary cutting part (2), and it is easier to strip the sheath (61) of the cable (6) at an easy-to-handle rotational speed.
[0150] 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.
[0151] In other words, in the seventh embodiment of the cable stripper (1), the power transmission unit (3) further includes a torque limiter (16) 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.
[0152] In the seventh 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 (16). Therefore, in the seventh embodiment of the cable stripper (1), the rotation of the rotary cutting section (2) can be stopped when the cutting edge (810) of the blade section (8) of the rotary cutting section (2) comes into contact with the core material (60) of the cable (6). As a result, in the seventh embodiment of the cable stripper (1), damage to the cutting edge (810) or the core material (60) is less likely to occur.
[0153] Furthermore, as described above in one embodiment and its modified form, the cable stripper (1) of the eighth embodiment additionally includes the following configuration in addition to the configuration of the seventh embodiment.
[0154] In other words, in the eighth embodiment of the cable stripper (1), the torque limiter (16) comprises a ring gear (160) and a spherical body (161) that is spring-biased and presses against one axial surface (160a) of the ring gear (160). The surface (160a) has a peak (162) that the spherical body (161) catches on when the ring gear (160) rotates in the forward and reverse directions. The peak (162) includes a first inclined surface (162a) facing the reverse rotation direction of the ring gear (160) and a second inclined surface (162b) facing the forward rotation direction of the ring gear (160). The inclination of the second inclined surface (162b) with respect to the flat portion which is the remaining part of the surface (160a) excluding the peak (162) is smaller than that of the first inclined surface (162a).
[0155] In the eighth embodiment of the cable stripper (1) having the above configuration, the second inclined surface (162b) of the peak (162) of the ring gear (160) facing the forward rotation direction has a smaller inclination than the first inclined surface (162a) facing the reverse rotation direction. Therefore, in the eighth embodiment of the cable stripper (1), when the cutting edge (810) becomes jammed with the sheathing (61) 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 161 to overcome the second inclined surface 162b) can be reduced. As a result, in the eighth embodiment of the cable stripper (1), excessive torque is suppressed from being applied from the cutting edge (810) to the object it contacts during the reverse rotation of the rotary cutting section (2).
[0156] Furthermore, as described above in one embodiment and its modified form, the cable stripper (1) of the ninth embodiment additionally includes the following configuration in addition to the configuration of any one of the sixth to eighth embodiments.
[0157] In other words, in the ninth embodiment of the cable stripper (1), the rotary cutting section (2) has a main body section (2a) with an insertion hole (20) on its inside, and a cylindrical section (2b) with a housing hole (9) on its inside that communicates with the downstream side of the insertion hole (20) and is connected to a power transmission section (3). A stopper (14) that receives the tip surface of the core material (60) is attached to the cylindrical section (2b) so as to be movable in the axial direction of the cylindrical section (2b).
[0158] In the ninth embodiment of the cable stripper (1) having the above configuration, the position of the stopper (14) inside the cylindrical part (2b) can be changed, so that the length of the cable (6) sheath (61) to be stripped can be adjusted.
[0159] Furthermore, as described above in one embodiment and its modified form, the tenth embodiment of the cable stripper (1) additionally includes the following configuration in addition to the configuration of the ninth embodiment.
[0160] In other words, in the tenth embodiment of the cable stripper (1), the outer circumferential surface (26) of the cylindrical portion (2b) has an elongated hole (260) extending in the axial direction of the cylindrical portion (2b) (i.e., the axial direction D1). The stopper (14) integrally comprises a stopper body (140) located within the housing hole (9) and movable in the axial direction, and an operating portion (141) located outside the cylindrical portion (2b) and movable in a direction perpendicular to the axial direction. Of the outer circumferential surface (26) of the cylindrical portion (2b), the portion around the elongated hole (260) 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 (axis X1) of the cylindrical portion (2b).
[0161] In the tenth embodiment of the cable stripper (1) having the above configuration, the operating part (141) contacts the portion of the outer circumferential surface (26) of the cylindrical part (2b) around the elongated hole (260), and from the state in which the stopper body (140) inside the cylindrical part (2b) is positioned, the inclined surface can prevent the operating part (141) from shifting toward the power transmission part (3). Therefore, in the tenth embodiment of the cable stripper (1), when the core material (60) of the cable (6) collides with the stopper body (140), displacement of the stopper body (140) can be prevented. As a result, in the tenth embodiment of the cable stripper (1), it is easier to stably strip the core material (60) of the cable (6) to a desired length.
[0162] Furthermore, as described in the embodiment and its modified form above, the eleventh embodiment of the power tool (10) comprises a cable stripper (1) of any one of the first to tenth embodiments and a rotational drive mechanism (11) for rotationally driving the rotary cutting section (2) of the cable stripper (1).
[0163] In the eleventh embodiment of the power tool (10) having the above configuration, when the rotational cutting section (2) is rotated by the rotational force of the rotational drive mechanism (11) to strip the insulation (61) from the cable (6), it is easier to suppress the core material (60) of the cable (6) from getting caught. Therefore, in the eleventh embodiment of the power tool (10), the rotational drive mechanism (11) is less likely to be subjected to load.
[0164] 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.
[0165] 1 Cable stripper 2 Rotary cutting section 2a Main body 2b Cylindrical section 20 Insertion hole 26 Outer surface 260 Slotted hole 3 Power transmission section 30 Connection section 4 Position operation section 40 Rotation operation section 400 Bottom wall section 401 Cylindrical section 5 Anti-jamming structure 6 Cable 60 Core material 61 Sheath 7 Cable holding section 8 Blade section 810 Cutting edge 9 Housing hole 14 Stopper 140 Stopper body 141 Operation section 10 Power tool 11 Rotary drive mechanism 15 Reduction mechanism 16 Torque limiter 160 Ring gear 160a One surface 161 Spherical body 162 Peak section 162a First inclined surface 162b Second inclined surface
Claims
1. A cable stripper comprising: an insertion hole into which a cable including a core and a sheath is inserted; a repositionable cable holding portion that holds the sheath of the cable inserted into the insertion hole; a repositionable blade portion whose cutting edge is located in the insertion hole downstream of the cable holding portion in the direction of cable insertion; a position operation portion that allows for changing the positions of the cable holding portion and the cutting edge when viewed in the direction of insertion; and a jamming prevention structure configured to prevent jamming of the portion of the core of the cable whose sheath has been stripped and exposed.
2. The anti-jamming structure includes a guide portion that protrudes into the insertion hole downstream of the cutting edge and guides the core material away from the cutting edge, according to claim 1.
3. The anti-jamming structure is provided on the downstream portion of the blade tip of the blade portion and includes a recess to avoid contact with the core material, as described in claim 1 or 2.
4. The cable stripper according to any one of claims 1 to 3, wherein the blade portion is provided on the surface facing the upstream side in the insertion direction and has a recess to avoid contact with the covering.
5. The cable stripper according to any one of claims 1 to 4, wherein the rotary cutting section further comprises a housing section that constitutes the outer shell of the rotary cutting section, the positioning section comprises a bottomed cylindrical rotary operating section, and the rotary operating section comprises a bottom wall section located upstream of the housing section in the insertion direction, and a cylindrical section extending from the bottom wall section so as to overlap the outer circumferential surface of the housing section.
6. A cable stripper according to any one of claims 1 to 5, further comprising a power transmission unit having a connection part connectable to a rotary drive mechanism, which transmits the rotational force of the rotary drive mechanism to the rotary cutting unit to rotate the rotary cutting unit relative to the cable, wherein the power transmission unit has a reduction mechanism that reduces the rotational force of the rotary drive mechanism and transmits it to the rotary cutting unit.
7. The cable stripper according to claim 6, further comprising a torque limiter which stops the transmission of the rotational force of the rotational drive mechanism to the rotational cutting section when the torque applied to the rotational cutting section exceeds a predetermined value.
8. 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 7.
9. The rotary cutting section comprises a main body with an insertion hole on its inner side, and a cylindrical section with a receiving hole on its inner side that communicates with the downstream side 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.
10. The cable stripper according to claim 9, 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.
11. A power tool comprising: a cable stripper according to any one of claims 1 to 10; and a rotational drive mechanism for rotationally driving the rotary cutting portion of the cable stripper.