Wire gripper and wire tensioning device

Abstract

[Problem] To provide a wire gripper and a wire tensioning device with good operability. [Solution] According to one aspect of the present invention, a wire gripper to be used when gripping a linear body is provided. This wire gripper is provided with a wire gripping part, a displacement mechanism, and a motor. The wire gripping part has a first member and a second member. The first member has a tapered groove. The second member is disposed so as to be in contact with a part of the groove, thereby forming a holding space in a gap which is not in contact therewith. The displacement mechanism is configured to displace a positional configuration of the first member and the second member, thereby changing the size of the holding space. The positional configuration has a first mode and a second mode. In the first mode, the linear body is gripped by the wire gripping part. In the second mode, the gripping of the linear body by the wire gripping part is released, and the motor is configured to generate rotational power for applying power to the displacement mechanism.

Description

Wire gripping device and wire tensioning device

[0001] The present invention relates to a wire gripper and a wire tensioning device.

[0002] Patent Document 1 discloses a wire gripper that can maintain a good gripping state even when a force is generated in the opposite direction to the tension, and also has a tension adjustment function.

[0003] This wire gripper has a wedge portion consisting of upper and lower wedge pieces as its wire gripping mechanism. The wedge portion is held in the main body so as to surround the side surface in the thickness direction and the upper and lower inclined portions. The upper wedge piece has an inclined groove formed on its back side that slidably engages with an inclined ridge formed on the main body. The lower wedge piece is connected to the upper wedge piece via a detachable guide portion that guides it in a direction opposite to the upper wedge piece so that it can be detached. A base with an inclined lower guide portion formed at its upper end is interposed between the lower wedge piece and the bottom of the main body. The upper end of an eyebolt threaded into the main body is rotatably connected to the lower end of the base.

[0004] JP 2018-11495 A

[0005] However, wire tensioning work is often performed at high altitudes, and therefore a wire gripper that is easy to operate and allows for quick and safe work is required. In view of the above circumstances, the present invention provides a wire gripper and wire tensioning device that are easy to operate.

[0006] According to one aspect of the present invention, there is provided a wire gripper used to clamp a linear object. The wire gripper includes a wire gripping unit, a displacement mechanism, and a motor. The wire gripping unit has a first member and a second member. The first member has a tapered groove. The second member is disposed so as to abut against a portion of the groove, thereby forming a clamping space in the gap where they do not abut. The displacement mechanism is configured to displace the positional aspects of the first member and the second member, thereby changing the size of the clamping space. The positional aspects include a first aspect and a second aspect. In the first aspect, the linear object is clamped by the wire gripping unit. In the second aspect, the clamping of the linear object by the wire gripping unit is released, and the motor is configured to generate rotational power to power the displacement mechanism.

[0007] According to this aspect, the wire gripper can be easily operated, and wire tensioning work can be carried out quickly and safely.

[0008] FIG. 1 is a front view showing the wire tensioning device 100 of the present embodiment. FIG. 2 is a perspective view showing the configuration of the support 300a in FIG. 1. FIG. 3 is a perspective view showing the configuration of the support 300b in FIG. 1. FIG. 4 is a perspective view showing the wire gripper 1 of the present embodiment. FIG. 5 is a perspective view showing the wire gripper 1 of the present embodiment. FIG. 6 is an exploded perspective view showing the configuration of the wire gripping unit 2 and the displacement mechanism 3. FIG. 7 is an exploded perspective view showing the configuration of the wire gripping unit 2 and the wire type detection mechanism 6. FIG. 8 is an exploded perspective view showing the configuration of the motor 4 and the transmission mechanism 5. FIG. 9 is a left side view showing the configuration of the transmission mechanism 5. FIG. 10 is a block diagram showing the configuration of the control board 7.

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Various features shown in the following embodiments can be combined with each other.

[0010] Incidentally, the program for realizing the software appearing in this embodiment may be provided as a non-transitory computer-readable recording medium, or may be provided so as to be downloadable from an external server, or may be provided so that the program is started on an external computer and its functions are realized on a client terminal (so-called cloud computing).

[0011] In this embodiment, the term "unit" may also include, for example, a combination of hardware resources implemented by a circuit in the broad sense and software information processing that can be specifically realized by these hardware resources. In addition, this embodiment handles various types of information, which may be represented by, for example, physical values ​​of signal values ​​representing voltages and currents, high and low signal values ​​as a binary bit set consisting of 0 or 1, or quantum superposition (so-called quantum bits), and communication and calculations may be performed on a circuit in the broad sense.

[0012] Furthermore, a circuit in the broad sense is a circuit realized by at least an appropriate combination of a circuit, circuitry, a processor, a memory, etc. In other words, it includes an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)), etc.

[0013] <Wire tensioning device> First, the wire tensioning device of this embodiment will be described. Fig. 1 is a front view showing the wire tensioning device 100 of this embodiment. Figs. 2 and 3 are perspective views showing the configuration of the support tool 300 in Fig. 1. In the following description, in Figs. 1 to 3 (and also in Figs. 4 to 9), the upper side will be referred to as "upper" or "upper side," and the lower side will be referred to as "lower" or "lower side." In addition, in Figs. 1 to 3 (and also in Figs. 4 to 9), the right side will be referred to as "right" or "rightward," and the left side will be referred to as "left" or "leftward."

[0014] The wire tensioning device (also referred to as a "strain rod") 100 shown in Fig. 1 is used, for example, to cut an insulated electric wire, which is an example of a linear body Ln, while it is in an overhead state. In Fig. 1, the insulated electric wire is indicated by a two-dot chain line.

[0015] This wire tensioning device 100 includes a pair of wire grippers 1 for clamping an insulated electric wire, which is an example of a linear body Ln, and a long stretcher 200 whose both ends are connected to the wire grippers 1 via connectors 400. The stretcher 200 is configured such that the longitudinal dimension of the stretcher 200 can be expanded or contracted by operating an operating unit 205 provided on the right side (the other side) of the stretcher 200 in the longitudinal direction.

[0016] 1, the extender 200 has a cylindrical main body portion 201 and a small-diameter cylindrical moving shaft portion 202 inserted into the main body portion 201 so as to be relatively movable in the longitudinal direction. The main body portion 201 is composed of a cylindrical portion 203 made of, for example, aluminum or FRP (fiber reinforced plastic), and a moving portion 204 fixed to the end of the cylindrical portion 203.

[0017] The moving part 204 has a casing made of, for example, an aluminum alloy, and a gear transmission mechanism (not shown) housed within the casing. The gear transmission mechanism is connected to an operating part 205 that protrudes from the underside of the casing and is rotated. The gear transmission mechanism is connected to a screw shaft that extends longitudinally within the cylindrical part 203, and a nut (not shown) provided at the end of the moving shaft part 202 on the main body cylindrical part 201 side is screwed onto the screw shaft. The moving shaft part 202 is made of, for example, FRP or the like.

[0018] When the telescopic device 200 is extended or retracted, a remote control device (an indirect tool) is engaged with the operating unit 205, and the operating unit 205 is rotated using the remote control device. This rotates the screw shaft inside the cylindrical part 203, and the moving shaft part 202, whose end nut is screwed onto the screw shaft, moves along the axial direction. As a result, the moving shaft part 202 appears and disappears from the main cylindrical part 201, and the telescopic device 200 is configured to extend or retract.

[0019] The end of the extender 200 on the main body cylindrical portion 201 side and the end on the moving shaft portion 202 side are provided with fixing members 500 capable of locking the connectors 400 .

[0020] The wire tensioning device 100 also includes a pair of supports 300 (support 300a and support 300b) attached to the stretcher 200. As shown in Figures 2 and 3, the supports 300a and 300b each include a substantially C-shaped support body 302 having an opening 301 on one side, and a closing piece 303 that closes the opening 301 of the support body 302. With this configuration, after an insulated electric wire, which is an example of a linear body Ln, is introduced into the support body 302 through the opening 301, the opening 301 of the support body 302 is closed with the closing piece 303, whereby the insulated electric wire can be supported by the support 300.

[0021] An engaging piece 306 is rotatably provided on the end of the support body 302 facing the opening 301 , and engages with the closing piece 303 when the opening 301 is closed by the closing piece 303 .

[0022] As shown in Fig. 2, the support 300a has a through-hole 304 formed in the lower part of the support body 302, through which the extender 200 (moving shaft portion 202) is inserted. On the other hand, as shown in Fig. 3, the support 300b has a through-hole 305 formed in the lower part of the support body 302, through which the extender 200 (cylindrical portion 203) is inserted.

[0023] Furthermore, the support 300b is provided with a fixing part 307 at the bottom of the support body 302 for fixing the expander 200 at a desired longitudinal position or at a predetermined rotation angle around the axis. Furthermore, operation parts 308 and 309 for operating the fixing part 307 by a remote control device are provided on both sides. With such support 300b, an operation for changing the direction of the end of the insulated electric wire on the right side after cutting (sorting operation) can be performed so that the ends of the insulated electric wires do not come into contact with each other after cutting.

[0024] The wire tensioning device 100 (or the stretcher 200 having a pair of wire grippers 1 at both ends) is used, for example, as follows: First, the pair of supports 300a, 300b are hooked onto the insulated electric wire. Next, a predetermined portion of the insulated electric wire is clamped by the right-side wire gripper 1, and a predetermined portion of the insulated electric wire is clamped by the left-side wire gripper 1. After that, the operating unit 205 is operated to contract the longitudinal dimension of the stretcher 200, and the pair of wire grippers 1 clamping the insulated electric wire (an example of a linear body Ln) are brought closer together. As a result, the insulated electric wire is tensioned outside the wire grippers 1 and relaxed in the portion of the insulated electric wire between the two wire grippers 1, and the relaxed portion of the insulated electric wire is cut with an indirect live wire cutting tool. On the other hand, the operating unit 205 can be operated to extend the longitudinal dimension of the extender 200 and separate the pair of wire grippers 1 that hold the insulated electric wire (an example of a linear body Ln). According to this embodiment, the wire grippers 1 can be easily operated to quickly and safely perform wire tensioning work.

[0025] <Wire gripper 1> Next, the wire gripper 1 will be described. Figures 4 and 5 are perspective views showing the wire gripper 1 of this embodiment. Figure 6 is an exploded perspective view showing the configuration of the wire gripping unit 2 and the displacement mechanism 3. Figure 7 is an exploded perspective view showing the configuration of the wire gripping unit 2 and the wire type detection mechanism 6. Figure 8 is an exploded perspective view showing the configuration of the motor 4 and the transmission mechanism 5. Figure 9 is a left side view showing the configuration of the transmission mechanism 5.

[0026] The wire gripper 1 shown in Figure 4 is a device used to clamp a linear object Ln, and is equipped with a wire gripping unit 2, a displacement mechanism 3, a motor 4, a transmission mechanism 5, a wire type detection mechanism 6, a control board 7, and a power supply unit 8.

[0027] 4 to 6, the wire gripping portion 2 has a first member 21, a second member 22, a third member 23, and a connecting member 24. The displacement mechanism 3 has a screw shaft 31 and a washer 32. In the following explanation, the first member 21, the second member 22, and the displacement mechanism 3 will first be explained.

[0028] The first member 21 is formed as a block-shaped member and has a tapered groove 21c and a through-hole 21d. The groove 21c has a gripping surface 21a and an inclined surface 21b on its inner surface, with the gripping surface 21a and the inclined surface 21b positioned opposite each other. The second member 22 is formed as a block-shaped member and has a gripping surface 22a, a sliding surface 22b, and a screw hole 22c. The second member 22 has the gripping surface 22a and the sliding surface 22b on opposite sides. The first member 21 and the second member 22 are arranged so that the inclined surface 21b and the sliding surface 22b abut against each other. In other words, the second member 22 is arranged so as to abut against a portion of the groove 21c of the first member 21. As a result, the wire gripping portion 2 has the wire gripping surface 21 a and the wire gripping surface 22 a at opposing positions, whereby the wire gripping surface 21 a and the wire gripping surface 22 a form a clamping space CS for clamping the linear body Ln. That is, with this configuration, the clamping space CS is formed in the gap where the first member 21 and the second member 22 are not in contact with each other.

[0029] In this embodiment, the gripping surfaces 21a and 22a have V-shaped grooves for clamping the linear body Ln. The gripping surfaces 21a and 22a may have arc-shaped grooves instead of V-shaped grooves. More preferably, the gripping surfaces 21a and 22a may be provided with anti-slip means for the linear body Ln. Examples of such anti-slip means include the formation of sharp minute protrusions, the formation of minute protrusions extending in the short direction, and the attachment of a rubber member.

[0030] Furthermore, the first member 21 and the second member 22 are configured so that the size of the clamping space CS changes depending on the change in the positional state. The positional state has a first state and a second state. The first state is a positional state in which the size of the clamping space CS is narrowed, thereby enabling the linear body Ln to be clamped. The second state is a positional state in which the size of the clamping space CS is widened, thereby enabling the clamping of the linear body Ln to be released. In other words, the positional state is configured so that the linear body Ln is clamped in the first state and the clamping of the linear body Ln is released in the second state.

[0031] In this embodiment, the first member 21 is fixed, and the second member 22 is configured to slide relative to the first member 21 and thereby displace along the longitudinal direction of the linear body Ln. That is, the second member 22 is a block-shaped slider. Preferably, the second member 22 has a wedge, prism, square pyramid, or truncated square pyramid shape. This configuration allows the linear body Ln to be more firmly clamped by the wedge effect, enabling quick and safe wire tensioning. More preferably, the first member 21 and the second member 22 are engaged with each other by a shape that aligns with the sliding direction. Such a shape that aligns with the sliding direction may be, for example, a convex shape on one side and a concave shape on the other side. The wire gripping portion 2 may be configured to displace both the first member 21 and the second member 22, or may be configured to displace the first member 21 relative to the fixed second member 22.

[0032] 6, first member 21, which is fixed, has through hole 21d, and second member 22, which slides relative to first member 21, has screw hole 22c. Alternatively, first member 21 may have the screw hole, and second member 22 may have the through hole. That is, at least one of first member 21 and second member 22 has a screw hole (e.g., screw hole 22c). Through hole 21d and screw hole 22c are provided at positions facing each other along the sliding direction of second member 22. The sliding direction of second member 22 is substantially the same as the longitudinal direction of linear body Ln.

[0033] The screw shaft 31 has a threaded portion 31a on one side in the longitudinal direction and a shaft portion 31c on the other side in the longitudinal direction. The screw shaft 31 also has a flange portion 31b between the threaded portion 31a and the shaft portion 31c.

[0034] A shaft portion 31c (screw shaft 31) is inserted into the washer 32, and the flange portion 31b abuts against the washer 32. The shaft portion 31c is inserted into the through-hole 21d (first member 21), and a timing pulley 53 of the transmission mechanism 5 is fitted into the portion (part of the shaft portion 31c) protruding from the first member 21 (details of the transmission mechanism 5 will be described later). As a result, the screw shaft 31, which is the displacement mechanism 3, is rotatably attached to the through-hole 21d (first member 21) with its axial displacement restricted. Furthermore, a threaded portion 31a (screw shaft 31) is threadedly engaged with the threaded hole 22c of the second member 22. In other words, the displacement mechanism 3 has a screw shaft 31 that threads into the screw hole 22c. With this configuration, as the screw shaft 31 rotates, the screw hole 22c (part of the second member 22) and the through-hole 21d (part of the first member 21) move closer to or farther away from each other along the longitudinal direction of the linear body Ln. That is, the displacement mechanism 3 is configured to be able to displace the second member 22 along the longitudinal direction of the linear body Ln while the first member 21 is fixed. In other words, the displacement mechanism 3 is configured to displace at least one of the first member 21 and the second member 22 in the longitudinal direction of the linear body Ln.

[0035] Furthermore, the size of the clamping space CS changes depending on the position of the second member 22 in the longitudinal direction of the linear body Ln. That is, the size of the clamping space CS changes depending on the longitudinal position of at least one of the first member 21 and the second member 22.

[0036] Specifically, displacement mechanism 3 displaces second member 22 along inclined surface 21b of tapered groove 21c. As described above, the tapered shape of groove 21c is composed of gripping surface 21a and inclined surface 21b disposed opposite thereto. Gripping surface 21a is a surface provided along the longitudinal direction of linear body Ln, and inclined surface 21b is a surface provided opposite and inclined to gripping surface 21a. In other words, gripping surface 21a and inclined surface 21b are close to each other on one side and far apart on the other side in the longitudinal direction of linear body Ln.

[0037] When the second member 22 is displaced toward the side where the gripping surface 21a and the inclined surface 21b are closer, the distance between the gripping surface 21a and the gripping surface 22a is closer, and the size of the clamping space CS can be narrowed. That is, the displacement mechanism 3 can displace the positional state of the gripping unit 2 to the first state. On the other hand, when the second member 22 is displaced toward the side where the gripping surface 21a and the inclined surface 21b are farther apart, the distance between the gripping surface 21a and the gripping surface 22a is greater, and the size of the clamping space CS can be widened. That is, the displacement mechanism 3 can displace the positional state of the gripping unit 2 to the second state. That is, the displacement mechanism 3 is configured to displace the positional state of the first member 21 and the second member 22, thereby changing the size of the clamping space CS.

[0038] 5A, when the screw shaft 31 is rotated toward the screw hole 22c (for example, rotated clockwise in the case of a right-handed screw), the screw hole 22c (part of the second member 22) is displaced toward the through-hole 21d (part of the first member 21) (see the thick arrow pointing approximately leftward in FIG. 5A). This displacement causes the wire gripping unit 2 to change from the state shown in FIG. 5A to the state shown in FIG. 5B, displacing the position so as to increase the size of the clamping space CS. In other words, by displacing the positional state of the wire gripper 1 to the second state, the clamping of the linear body Ln (not shown) can be released, or preparations can be made to clamp the linear body Ln.

[0039] In the state shown in Fig. 5B , when the screw shaft 31 is rotated in the direction to loosen the screw hole 22c (e.g., rotated counterclockwise in the case of a right-handed screw), the screw hole 22c (part of the second member 22) is displaced away from the through-hole 21d (part of the first member 21) (see the thick arrow pointing approximately rightward in Fig. 5B ). This displacement causes the wire gripping unit 2 to change from the state shown in Fig. 5B to the state shown in Fig. 5A , thereby displacing the wire gripping unit 2 so as to narrow the clamping space CS. In other words, by displacing the position of the wire gripper 1 to the first state, the linear object Ln (not shown) can be clamped.

[0040] Next, the third member 23 will be described. The third member 23 is composed of a narrow plate piece and is rotatably attached to each of the first member 21 and the second member 22. The third member 23 is disposed adjacent to each of the first member 21 and the second member 22, thereby forming part of the clamping space CS. In other words, the displacement mechanism 3 is configured to displace the third member 23 in accordance with the displacement of the positional aspect of the gripping portion 2. In other words, the third member 23 is configured so that its position and posture are displaced in accordance with the displacement of the positional aspect of the first member 21 and the second member 22.

[0041] The first mode is a positional mode in which the first member 21, the second member 22, and the third member 23 form a hole through which the linear body Ln can be inserted. This allows the linear body Ln to be retained in the clamping space CS. The second mode is a positional mode in which a gap through which the linear body Ln can be inserted and removed is formed in the clamping space CS. This allows the linear body Ln to be inserted and removed from the clamping space CS. In other words, in the first mode, a hole through which the linear body Ln can be inserted and removed is formed in at least a part of the clamping space CS, and in the second mode, a gap through which the linear body Ln can be inserted and removed is formed in the clamping space CS. Details will be explained below.

[0042] As shown in FIG. 7 , the through-hole 23a of the third member 23 penetrates from the front surface 23d to the back surface 23e of the third member 23. A cylindrical portion 231b of a shoulder bolt 231 is inserted into the through-hole 23a, with the screw head 231c abutting against the front surface 23d. The threaded portion 231a is inserted through a through-hole 241c of the connecting member 241 (part of the connecting member 24), a through-hole 21f of the first member 21, and a through-hole 242c of the connecting member 242 (part of the connecting member 24), and a nut 245 is threadedly engaged with the portion protruding from the through-hole 242c. Details of the connecting member 24 will be described later. Furthermore, a bolt 232 is inserted through the through-hole 23b of the third member 23, and the bolt 232 is threadedly engaged with the threaded hole 22d of the second member 22. As a result, the third member 23 is attached to each of the first member 21 and the second member 22 so as to be rotatable.

[0043] In the state shown in Fig. 5A, third member 23 is disposed so as to be close to gripping surface 21a of first member 21 and gripping surface 22a of second member 22. As a result, third member 23 is disposed so as to form a part of clamping space CS, and first member 21, second member 22, and third member 23 form a hole through which linear body Ln can be inserted. When changing from the state shown in Fig. 5A, which is the first mode, to the state shown in Fig. 5B, which is the second mode, third member 23 is displaced in conjunction with the displacement of second member 22. As a result, third member 23 is displaced away from first member 21, forming a gap in clamping space CS through which linear body Ln can be inserted and removed. That is, when the wire gripping device 1 is shifted from the second state to the first state, i.e., when an unclamped linear object Ln is inserted into the clamping space CS, the wire gripping unit 2 is configured to keep the unclamped linear object Ln in the clamping space CS by the displacement of the third member 23. According to this mode, the work of attaching the linear object Ln to the wire gripping device 1 is simplified, and the wire tensioning work can be performed quickly and safely.

[0044] Next, the connecting member 24 will be described. As shown in Figures 4 and 7, the connecting member 24 is made up of narrow plate pieces and includes connecting members 241 and 242. The connecting members 241 and 242 are attached so as to sandwich the first member 21, and the through hole 241a of the connecting member 241 overlaps the through hole 242a of the connecting member 242 to form the through hole 24a. A bolt 243 is inserted into the through hole 241b of the connecting member 241, and the screw head of the bolt 243 abuts against the through hole 241b. The bolt 243 is further inserted into the through hole 21e of the first member 21 and the through hole 242b of the connecting member 242, and a nut 244 is screwed onto the portion of the bolt 243 protruding from the through hole 242b. As described above, the shoulder bolt 231 is inserted into the through-hole 241c of the connecting member 241 and the through-hole 242c of the connecting member 242, and is screwed with the nut 245. The connecting member 24 is fixed to the first member 21 by the above-mentioned configuration, and the connector 400 of the wire tensioning device 100 is connected to the through-hole 24a.

[0045] As shown in FIGS. 8 and 9 , the motor 4 has a rotating shaft 41 and a case 42, and the transmission mechanism 5 has timing pulleys 51 to 53, a timing belt 54, and a plate 55. The case 42 is fixed to the plate 55, and the rotating shaft 41 is inserted through a through-hole 55a in the plate 55. The timing pulley 51 is fitted to the rotating shaft 41 at a portion protruding from the through-hole 55a. A bolt 521 is inserted into the timing pulley 52, and the head of the bolt 521 abuts against the timing pulley 52. ​​The bolt 521 is further inserted through a through-hole 55b in the plate 55, and a nut 522 is threadedly engaged with the portion protruding from the through-hole 55b. The timing pulley 53 is fitted to the screw shaft 31, as described above. The plate 55 is threadedly engaged with the first member 21 by bolts 551 and 552. With the above configuration, the timing pulleys 51 to 53 are arranged so that a timing belt 54 for transmitting power can be wound around them.

[0046] As shown in FIG. 9A , the timing belt 54 is wound around the timing pulleys 51 to 53 and attached to the wire gripper 1. The timing pulley 52 is displaced by threading the bolt 523 into the threaded hole 55c and tightening the bolt 523 (see the thick arrow pointing generally upward in FIG. 9A ). As shown in FIG. 9B , tightening the bolt 523 displaces the timing pulley 52, allowing the timing belt 54 to be adjusted to a predetermined tension. By maintaining the timing belt 54 at a predetermined tension, the transmission mechanism 5 can smoothly transmit power from the motor 4 to the threaded shaft 31. With this configuration, the rotational force of the rotating shaft 41 of the motor 4 can be transmitted to the threaded shaft 31 of the displacement mechanism 3 via the timing pulleys 51 to 53 and the timing belt 54. In other words, the timing pulleys 51 to 53 and the timing belt 54 constitute a rotational force transmission mechanism. With the above configuration, the motor 4 is configured to generate rotational power for powering the displacement mechanism 3. Specifically, the motor 4 is configured to apply power to the screw shaft 31. This configuration allows the wire gripper 1 to be operated with higher precision, enabling wire tensioning work to be performed quickly and safely. Furthermore, the transmission mechanism 5 is configured to transmit the rotational power generated by the motor 4 to the displacement mechanism 3. Specifically, the transmission mechanism 5 is configured with a belt (e.g., a timing belt 54) or gears. This configuration allows the wire gripper 1 to be made more compact. Note that the configuration is not limited to threaded engagement between the screw shaft 31 of the displacement mechanism 3 and the threaded hole 22c of the second member 22. For example, a rack-and-pinion mechanism may be employed. In this case, at least one of the first member 21 and the second member 22 is configured to have a rack, and the displacement mechanism 3 has a pinion meshing with the rack, thereby forming a rack-and-pinion mechanism. Furthermore, the motor 4 is configured to apply power to the pinion. According to this embodiment, the wire gripper 1 can be operated with higher precision, and wire tensioning work can be performed quickly and safely.

[0047] 4, 5, and 7, the line type detection mechanism 6 is configured in a block shape. A bolt 63 is inserted into the through hole 6a of the line type detection mechanism 6, and the portion protruding from the through hole 6a is screwed into the screw hole 21g of the first member 21. In this way, the line type detection mechanism 6 is fixed to the first member 21.

[0048] The wire type detection mechanism 6 includes a first position sensor 61 and a second position sensor 62, each of which includes a button 61a and a button 62a. A third member 23 is provided near the wire type detection mechanism 6. The third member 23 is configured to press the button 61a or the button 62a in response to a change in the position of the wire gripping unit 2. Specifically, as shown in FIG. 5A , when the clamping space CS is narrowed to a predetermined size, the button 62a is pressed by the protrusion 23c of the third member 23. Furthermore, as shown in FIG. 5B , when the clamping space CS is widened to a predetermined size, the button 61a is pressed by the side surface of the third member 23. By pressing the button 61a or the button 62a, the first position sensor 61 and the second position sensor 62 can be turned on.

[0049] The motor 4 of this embodiment includes an encoder 60 (not shown) therein and is configured to be able to measure the number of rotations of the rotating shaft 41. In other words, the wire type detection mechanism 6 further includes the encoder 60, which is configured to measure the number of rotations of the motor 4. Examples of the encoder 60 include an optical type, a mechanical (contact type), a magnetic type, and an electromagnetic induction type. In this embodiment, the encoder 60 is provided inside the motor 4, but is not limited to this and may be provided in the displacement mechanism 3, the transmission mechanism 5, etc., for example.

[0050] With this configuration, as shown in FIG. 5B , the position where the side surface of the third member 23 presses the button 61a of the first position sensor 61, i.e., the position where the clamping space CS is at its widest, can be identified as the position where the encoder 60 starts measuring the rotation speed of the rotating shaft 41. The encoder 60 measures the rotation speed of the rotating shaft 41 using this position as a base point. Furthermore, when the linear object Ln is clamped by the wire gripping unit 2, the rotation of the rotating shaft 41 of the motor 4 stops or slows down at the clamping position. In other words, by detecting changes in the angular velocity of the rotating shaft 41 using the encoder 60, the wire gripper 1 can identify the clamped state of the linear object Ln. Alternatively, the wire gripper 1 may identify the clamped state of the linear object Ln by detecting changes in the current value during operation of the motor 4. With this configuration, the wire gripper 1 can measure the thickness (outer diameter) of the linear object Ln clamped by the wire gripping unit 2. The type of linear object Ln can be detected by comparing the measurement results with the database. In other words, the first position sensor 61 is configured to identify the position at which measurement of the number of rotations starts, thereby detecting the type of linear object Ln held by the wire gripping unit 2. According to this aspect, the type of linear object Ln can be detected by the wire gripping device 1, and wire stringing work can be performed quickly and safely.

[0051] On the other hand, when the protrusion 23c of the third member 23 presses the button 62a of the second position sensor 62, the clamping space CS is narrowed to a predetermined size, so the configuration can be such that power supply to the motor 4 is stopped. In other words, the second position sensor 62 is configured to identify the position at which rotation of the motor 4 is stopped. According to this configuration, deterioration and damage to the wire gripper 1 can be suitably prevented.

[0052] In addition, the wire type detection mechanism 6 that detects the type of linear body Ln clamped in the gripping portion 2 is not limited to the above configuration, and may be configured, for example, by providing a pressure sensor on the gripping surface 21a of the first member 21 and the gripping surface 22a of the second member 22, or by providing a sensor that measures the distance between the first member 21 and the second member 22.

[0053] 4 and 8, the power supply unit 8 is disposed below the motor 4 and includes a battery 81 and a battery mounting portion 82. The battery 81 is detachably mounted in the battery mounting portion 82, which is fixed to the wire gripping portion 2. The power supply unit 8 is configured to supply power to at least the motor 4. The battery 81 may be, for example, a dry cell, a primary battery such as a solar cell, or a secondary battery such as a lithium-ion battery.

[0054] 4 and 8, the control board 7 is attached to a support base 74, and the support base 74 is fixed to the gripping portion 2. Preferably, a cover (not shown) for covering the control board 7 is provided.

[0055] Fig. 10 is a block diagram showing the configuration of the control board 7. The control board 7 shown in Fig. 10 is, for example, a dedicated control device that controls at least the motor 4, and is configured to electrically control at least the rotation of the motor 4. The control board 7 has a communication unit 71, a storage unit 72, and a control unit 73, and these components are electrically connected via a communication bus 70. In addition to the motor 4, the control board 7 is also electrically connected to the wire type detection mechanism 6 and the power supply unit 8.

[0056] The communication unit 71 is configured to be able to transmit various electrical signals from the control board 7 to external components. The communication unit 71 is also configured to be able to receive various electrical signals from the external components to the control board 7. More preferably, the communication unit 71 has a network communication function, which allows communication of various information with external devices via a network such as the Internet.

[0057] The communication unit 71 is preferably a wired communication means such as USB, IEEE 1394, Thunderbolt (registered trademark), wired LAN network communication, etc., but may also include wireless LAN network communication, mobile communication such as 3G / LTE / 5G, BLUETOOTH (registered trademark) communication, etc. as needed. In other words, it is more preferable to implement it as a collection of these multiple communication means.

[0058] The memory unit 72 stores various information defined above. This can be implemented, for example, as a storage device such as a solid state drive (SSD) that stores various programs related to the wire gripper 1 executed by the control unit 73, or as a memory such as a random access memory (RAM) that stores temporarily required information (arguments, arrays, etc.) related to program calculations. The memory unit 72 stores various programs and variables related to the wire gripper 1 executed by the control unit 73. It is particularly preferable that information related to construction plans to be carried out using the wire gripper 1 be stored in the memory unit 72.

[0059] The control unit 73 processes and controls the overall operation related to the wire gripper 1. The control unit 73 is, for example, a central processing unit (CPU) not shown. The control unit 73 realizes various functions related to the wire gripper 1 by reading out predetermined programs stored in the storage unit 72. In other words, information processing by the software stored in the storage unit 72 is specifically realized by the control unit 73, which is an example of hardware. Note that the control unit 73 is not limited to being single, and multiple control units 73 may be provided for each function. A combination of these may also be used.

[0060] Next, a method of using the wire gripper 1 (wire tensioning device 100) will be described using an example in which an insulated electric wire (an example of a linear body Ln) is clamped. [1] First, the supports 300a, 300b are hooked onto the insulated electric wire. Then, the pair of wire grippers 1 connected to both ends of the stretcher 200 are attached to the insulated electric wire using a remote control. Specifically, the first member 21, the second member 22, and the third member 23 are displaced to the second position, the insulated electric wire is inserted into the clamping space CS, and the gripping surface 21a of the first member 21 is hooked onto the insulated electric wire.

[0061] [2] Next, the wire gripper 1 is activated using an external terminal (not shown). At this time, the control unit 73 of the control board 7 determines whether the position at which the encoder 60 starts measuring the number of rotations of the rotating shaft 41 has been identified. If the position has not been identified, a learning operation is performed. Specifically, the control board 7 controls the operation of the motor 4, either automatically or in response to a user's operation, until the button 61 a of the first position sensor 61 is pressed on the side of the third member 23. When the button 61 a is pressed on the side of the third member 23 and the control board 7 receives input from the first position sensor 61, the control board 7 stops the operation of the motor 4 and identifies the position at which the encoder 60 starts measuring the number of rotations of the rotating shaft 41. The learning operation may be performed each time the wire gripper 1 is used. For example, the control board 7 may control the position of the wire gripper 1 after use to be the learning position. Alternatively, the learning operation may be performed when the number of times the wire gripper 1 has been used reaches a predetermined number of times, when the period / time of use of the wire gripper 1 reaches a predetermined period / time, etc.

[0062] [3] Next, an external terminal (not shown) is used to operate the motor 4, which rotates the screw shaft 31 of the displacement mechanism 3 in a predetermined direction via the transmission mechanism 5. This causes the first member 21, which is threadedly engaged with the screw shaft 31, to slide relative to the first member 21, and the third member 23 to rotate relative to the first member 21 and the second member 22. As the third member 23 rotates, the first member 21, the second member 22, and the third member 23 form a hole in the clamping space CS through which the insulated electric wire can be inserted. This allows the insulated electric wire to be retained within the clamping space CS before being clamped. Furthermore, as the second member 22 slides, the gripping surfaces 21 a of the first member 21 and the gripping surfaces 22 a of the second member 22 approach each other, narrowing the size of the clamping space CS, allowing the insulated electric wire to be clamped. This allows the pair of wire grippers 1 to be fixed to the insulated electric wire.

[0063] The wire gripper 1 also detects changes in the angular velocity of the rotating shaft 41 based on the input from the encoder 60, and stops the operation of the motor 4 when the rotation of the rotating shaft 41 of the motor 4 stops or slows down. Alternatively, the wire gripper 1 may stop the operation of the motor 4 in response to a user's operation of an external terminal. This maintains the first configuration between the first member 21 and the second member 22, allowing the insulated electric wire to continue to be clamped. The wire type detection mechanism 6 also detects the type of insulated electric wire using the measurement results of the thickness (outer diameter) of the clamped insulated electric wire. The result is notified to an external terminal (not shown). Furthermore, if the insulated electric wire to be clamped has been registered in advance by the user, it is determined whether the insulated electric wire clamped by the wire gripper 1 matches the registered insulated electric wire, and the result is notified to an external terminal (not shown).

[0064] [4] When cutting the insulated electric wire, the operating unit 205 is operated by the remote control tool to contract the longitudinal dimension of the expander 200 and bring the wire grippers 1 closer to each other. This makes it possible to tensile the insulated electric wire outside the wire grippers 1 and to relax the insulated electric wire in the portion between the two wire grippers 1.

[0065] [5] After the work is completed, the operating unit 205 is operated using the remote control device to extend the longitudinal dimension of the extender 200 and move the wire grippers 1 away from each other. Then, the motor 4 is operated using an external terminal to rotate the screw shaft 31 of the displacement mechanism 3 in the opposite direction to the above via the transmission mechanism 5. This displaces the first member 21 and the second member 22 from the first position to the second position, releasing the clamping of the insulated electric wire. Finally, the wire tensioning device 100 is detached from the insulated electric wire using the remote control device.

[0066] As described above, according to this embodiment, the wire gripper 1 is configured to clamp the insulated wire using the motor 4. Therefore, the wire gripper 1 itself assists in tasks that require a large amount of force, improving operability. Furthermore, whereas conventional tasks required two workers aboard a bucket in the air, this can now be performed by a single worker, improving workability. Furthermore, the remaining worker can monitor the work status of the worker on the bucket from the ground and issue accurate instructions, improving safety. According to this aspect, wire stringing work can be performed quickly and safely by simply operating the wire gripper 1.

[0067] Furthermore, by attaching various sensors to the wire gripper 1, data obtained during work can be transmitted to an external terminal (e.g., a tablet terminal) via the communication unit 71 of the control board 7 and stored therein. Based on the obtained data, work history can be confirmed and management such as whether or not the wire gripper 1 needs repair can be performed, which is also preferable from the perspective of improving safety. The external terminal may be a foot switch, a voice recognition device, or the like. In this case, even when working alone, both hands can be freed when operating the wire gripper 1. Furthermore, even when working simultaneously on multiple insulated electric wires using the wire tensioning device 100, wire tensioning work, etc. can be performed using a single external terminal.

[0068] Furthermore, it may be provided in the following aspects.

[0069] (1) A wire gripper used to clamp a linear object, comprising a wire gripping section, a displacement mechanism, and a motor, wherein the wire gripping section has a first member and a second member, the first member having a tapered groove, and the second member being positioned to abut against a portion of the groove, thereby forming a clamping space in the gap where they are not abutting, the displacement mechanism being configured to displace the positional configuration of the first member and the second member, thereby changing the size of the clamping space, wherein the positional configuration has a first configuration and a second configuration, wherein in the first configuration, the linear object is clamped by the wire gripping section, and in the second configuration, the clamping of the linear object by the wire gripping section is released, and the motor being configured to generate rotational power to impart power to the displacement mechanism.

[0070] According to this aspect, the wire gripper can be easily operated, and wire tensioning work can be carried out quickly and safely.

[0071] (2) In the wire gripper described in (1) above, the first member is fixed, and the second member is a slider that slides relative to the first member.

[0072] (3) In the wire gripper described in (1) or (2) above, the second member has a wedge-like, prismatic, square pyramidal, or truncated square pyramidal shape.

[0073] According to this aspect, the linear object can be more firmly clamped by the wedge effect, and the wire tensioning work can be carried out quickly and safely.

[0074] (4) In the wire gripper described in any one of (1) to (3) above, the displacement mechanism is configured to displace at least one of the first member and the second member in the longitudinal direction of the linear body, and the size of the clamping space changes depending on the longitudinal position.

[0075] (5) In the wire gripper described in any one of (1) to (4) above, at least one of the first member and the second member has a screw hole, the displacement mechanism has a screw shaft that screws into the screw hole, and the motor is configured to apply power to the screw shaft.

[0076] According to this aspect, the wire gripper can be operated with higher precision, and wire tensioning work can be carried out quickly and safely.

[0077] (6) In the wire gripper described in any one of (1) to (4) above, at least one of the first member and the second member has a rack, the displacement mechanism has a pinion that meshes with the rack, thereby forming a rack and pinion mechanism, and the motor is configured to apply power to the pinion.

[0078] According to this aspect, the wire gripper can be operated with higher precision, and wire tensioning work can be carried out quickly and safely.

[0079] (7) A wire gripper according to any one of (1) to (6) above, further comprising a transmission mechanism, the transmission mechanism being configured to transmit the rotational power generated by the motor to the displacement mechanism.

[0080] (8) The wire gripper according to (7) above, wherein the transmission mechanism is a belt or a gear.

[0081] According to this aspect, the wire gripper can be made even more compact.

[0082] (9) In the wire gripper described in any one of (1) to (8) above, the wire gripping portion further includes a third member, the third member is arranged to form part of the clamping space, the displacement mechanism is configured to displace the third member in accordance with the change in the positional state, and in the first state, a hole through which the linear object can be inserted is formed in at least a part of the clamping space, and in the second state, a gap through which the linear object can be inserted and removed is formed in the clamping space.

[0083] According to this aspect, the work of attaching the linear body to the wire gripper becomes easier, and the wire tensioning work can be carried out quickly and safely.

[0084] (10) A wire gripper according to any one of (1) to (9) above, further comprising a wire type detection mechanism, the wire type detection mechanism having an encoder and a first position sensor, the encoder configured to measure the number of rotations of the motor, and the first position sensor configured to identify the position at which to start measuring the number of rotations, thereby detecting the type of the linear object clamped in the wire gripping portion.

[0085] According to this aspect, the type of the linear object can be detected by the wire gripper, and the wire tensioning work can be carried out quickly and safely.

[0086] (11) The wire gripper according to any one of (1) to (10) above, further comprising a second position sensor, the second position sensor being configured to identify a position at which rotation of the motor is stopped.

[0087] According to this aspect, deterioration and damage to the wire gripper can be suitably prevented.

[0088] (12) The wire gripper according to any one of (1) to (11) above, further comprising a control board, the control board being configured to electrically control at least the rotation of the motor.

[0089] (13) The wire gripper according to any one of (1) to (12) above, further comprising a power supply unit, the power supply unit supplying power to at least the motor.

[0090] (14) A wire tensioning device comprising a pair of wire grippers and an extender, wherein the pair of wire grippers are each composed of the wire grippers described in any one of (1) to (13) above, and the extender has the pair of wire grippers at both ends thereof and is configured to move the pair of wire grippers, which clamp the linear body, closer together and apart.

[0091] According to this embodiment, the wire gripping tool can be easily operated, and the wire tensioning work can be carried out quickly and safely.

[0092] Finally, while various embodiments of the present disclosure have been described, they are presented as examples and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as defined in the claims.

[0093] DESCRIPTION OF SYMBOLS 100: Wire tensioning device 200: Expander 201: Main body cylindrical portion 202: Moving shaft portion 203: Cylindrical portion 204: Operating portion 205: Operating portion 300: Support 300a: Support 300b: Support 301: Opening 302: Support body 303: Closing piece 304: Through hole 305: Through hole 306: Engagement piece 307: Fixing portion 308: Operating portion 309: Operating portion 400: Connector 500: Fixing member 1: Wire gripper 2: Wire gripping portion 21: First member 21a: Wire gripping surface 21b: Inclined surface 21c: Groove 21d: Through hole 21e: Through hole 21f : Through hole 21g : Screw hole 22 : Second member 22a : Gripping surface 22b : Sliding surface 22c : Screw hole 22d : Screw hole 23 : Third member 23a : Through hole 23b : Through hole 23c : Protrusion 23d : Front surface 23e : Back surface 231 : Shoulder bolt 231a : Threaded portion 231b : Cylindrical portion 231c : Screw head 232 : Bolt 24 : Connecting member 24a : Through hole 241 : Connecting member 241a : Through hole 241b : Through hole 241c : Through hole 242 : Connecting member 242a : Through hole 242b : Through hole 242c : Through hole 243 : Bolt 244 : Nut 245 : Nut 3 : Displacement mechanism 31 : Screw shaft 31a : Threaded portion 31b : Flange portion 31c : Shaft portion 32 : Washer 4 : Motor 41 : Rotating shaft 42 : Case 5 : Transmission mechanism 51 : Timing pulley 52 : Timing pulley 521 : Bolt 522 : Nut 523 : Bolt 53 : Timing pulley 54 : Timing belt 55 : Plate 55a : Through hole 55b : Through hole 55c : Screw hole 551 : Bolt 552 : Bolt 6 : Wire type detection mechanism 6a : Through hole 60 : Encoder 61 : First position sensor 61a : Button 62 : Second position sensor 62a : Button 63 : Bolt 7 : Control board 70 : Communication bus 71 : Communication unit72: Memory unit 73: Control unit 74: Support base 8: Power supply unit 81: Battery 82: Battery mounting unit CS: Clamping space Ln: Linear body

Claims

1. A wire gripper used when gripping a linear object, It comprises a wire gripping section, a displacement mechanism, and a motor. The gripping portion comprises a first member and a second member. The first member has a tapered groove, The second member is positioned to abut against a part of the groove, thereby creating a clamping space in the gap that is not in contact with the groove. The displacement mechanism is configured to displace the positional configuration of the first member and the second member, thereby changing the size of the clamping space, where The aforementioned positional configuration includes a first configuration and a second configuration. In the first embodiment described above, the linear body is held by the gripping portion, In the second embodiment described above, the gripping portion releases the clamping of the linear body. The motor is configured to generate rotational power for powering the displacement mechanism, and is a wire gripper.

2. In the wire gripper according to claim 1, The first member is fixed in place. The second member is a wire gripper, which is a slider that slides relative to the first member.

3. In the wire gripper according to claim 1, The second member is a wire gripper having the shape of a wedge, prismatic, square pyramid, or truncated square base.

4. In the wire gripper according to claim 1, The displacement mechanism is configured to displace at least one of the first member and the second member in the longitudinal direction of the linear body. A wire gripper in which the size of the gripping space changes according to the position in the longitudinal direction.

5. In the wire gripper according to claim 1, At least one of the first member and the second member has a screw hole, The displacement mechanism has a screw shaft that is screwed into the screw hole, The motor is configured to provide power to the screw shaft, and is a wire gripper.

6. In the wire gripper according to claim 1, At least one of the first member and the second member has a rack, The displacement mechanism has a pinion that meshes with the rack, thereby forming a rack and pinion mechanism. The motor is configured to supply power to the pinion, and the device is a wire gripper.

7. In the wire gripper according to claim 1, Furthermore, it is equipped with a transmission mechanism, The transmission mechanism is configured to transmit rotational power generated by the motor to the displacement mechanism, and is a wire gripper.

8. In the wire gripper according to claim 7, The transmission mechanism is a wire gripper, which is a belt or a gear.

9. In the wire gripper according to claim 1, The gripping portion further comprises a third member, The third member is arranged to form part of the clamping space, The displacement mechanism is configured to displace the third member in accordance with the displacement of the positional configuration. In the first embodiment described above, a hole is formed in at least a part of the clamping space through which the linear body can be inserted. In the second embodiment described above, a wire gripper is provided in which a gap is formed in the gripping space that allows the linear body to be inserted into and removed.

10. In the wire gripper according to claim 1, Furthermore, it is equipped with a line type detection mechanism. The aforementioned wire type detection mechanism includes an encoder and a first position sensor. The encoder is configured to measure the rotational speed of the motor, A wire gripper wherein the first position sensor is configured to identify the position at which the measurement of the rotational speed begins, thereby detecting the type of the linear body being held in the wire gripper.

11. In the wire gripper according to claim 1, Furthermore, it has a second position sensor, The second position sensor is configured to identify a position at which the rotation of the motor stops, and is a wire gripper.

12. In the wire gripper according to claim 1, Furthermore, it is equipped with a control board, The control board is configured to electrically control at least the rotation of the motor, and is a wire gripper.

13. In the wire gripper according to claim 1, Furthermore, it is equipped with a power supply unit, The power supply unit is a wire gripper that supplies power to at least the motor.

14. A tensioning device, It comprises a pair of wire grippers and an expander, Each of the pair of wire grippers is composed of a wire gripper according to any one of claims 1 to 13. The expandable coil is equipped with the pair of wire grippers at both ends thereof, and is configured to move the pair of wire grippers, which are gripping the linear body, closer together and further apart.