JP2013017288A - Feeder line laying machine and feeder line laying method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeder line laying device and a feeder line laying method for easily laying a feeder line even in a high-rise building in which the feeder line is necessary to be constructed by bending it at a plurality of places.SOLUTION: A feeder line laying machine comprises: a base 3 fixed to a building 2; a feeding mechanism 5 which is installed in the base 3 and feeds a feeder line 4 in an axial direction; and a drive section 6 which is connected to the feeding mechanism 5 and drives the feeding mechanism 5. The feeding mechanism 5 includes: a pair of endless tracks 18 which are oppositely arranged across the feeder line 4; and a cable holding section 19 having a plurality of reception sections 22 installed in the endless tracks 18 in the circulating directions and formed in arc shapes to hold the feeder line 4. The reception sections 22 are divided in the circumferential direction of the feeder line 4 and are installed in a cable holding section body 21 so that they can oscillate around an axis parallel to the feeder line 4.

Description

  The present invention relates to a feeder for a feeder line for extending a feeder line and a feeder method for extending a feeder line using the feeder for this feeder line.

  When laying a feed line connected to an antenna on a radio tower in the radio tower, a drum around which the feed line is wound is generally installed so that it can be extended to the ground, etc. Are laid.

Japanese Patent Laid-Open No. 9-140019

  By the way, in recent years, high-rise buildings such as radio towers having expanded applications other than antennas have been built, and the necessity of laying feeders in such high-rise buildings has arisen.

  When laying a feeder line in such a high-rise building, it is necessary to bend the feeder line at multiple points, but the feeder line is made of a high-frequency coaxial cable and is hollow, so it is not easily bent and bent. Even if the part is supported by a roller, there is a problem that it cannot be easily laid.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above problems and to provide a feeder for a feeder line and a feeder for easily extending the feeder line even in a high-rise building where it is necessary to bend and feed a plurality of feeder lines. An object of the present invention is to provide a feeding line drawing method using a wire drawing apparatus.

  In order to solve the above-described problems, the present invention provides a base portion fixed to a building, a feed mechanism provided in the base portion for feeding a feed line in an axial direction, and a drive connected to the feed mechanism to drive the feed mechanism. The feed mechanism is a pair of endless tracks arranged opposite to each other so as to sandwich the power supply line, and a plurality of the endless tracks are provided along the circulation direction in an arc shape so as to grip the power supply line. A cable gripping portion having a formed receiving portion, and the receiving portion is divided in a circumferential direction of the power supply line, and is swingable about an axis parallel to the power supply line in the cable gripping body. It is provided.

  The cable gripper body is provided on the endless track and circulates integrally with the endless track. Moreover, it is good for the said receiving part to be provided with the buffer material contact | abutted to the said electric power feeding line.

  The receiving portion may be provided with a spring that biases the receiving portion in one of the swing directions. The spring may be provided between each of the divided receiving portions and the cable gripping portion main body.

  A high-rise building is provided so that a power supply wire wound around a take-up drum can be fed out, and the power line extension device according to any one of claims 1 to 3 extends upward from the take-up drum and bends. A plurality of power supply lines are provided along the extending wire path, and the power supply lines wound around the winding drum are sequentially sent from the winding drum to a power supply line drawing machine on the extending path and extended.

  It is preferable to arrange the feeder for wire feeding before and after the bent portion of the wire drawing path.

  When feeding the feeder to the feeder, the guide wire is connected in advance to the leading end of the feeder in the feeding direction, and the guide wire is arranged on the extension path in advance. The feeder line may be extended while pulling the tip of the electric wire with a guide wire.

  Further, after extending the feeder line over the entire length of the extension path, the feeder line is further sent upward to discharge the end of the feeder line from the winding drum, and the end of the feeder line is It is good to send a feeder to a high-rise building below the winding drum by sending it downward with a feeder for a feeder.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a high-rise building which needs to bend and lay in several places, a feeder line can be easily extended.

It is a front view of the wire feeder for feeders concerning this embodiment. It is a side view of FIG. It is a principal part bottom view of FIG. It is a principal part enlarged view of FIG. It is the sectional view on the AA line of FIG. It is explanatory drawing of the state which lets a feeder line pass to the wire feeder for feeder lines. (A) is explanatory drawing which shows the extended state of a feed wire, (b) is explanatory drawing of the bending part of a feed wire, (c) is explanatory drawing of the state which sends a feed wire below a winding drum. It is.

  FIG. 1 is a front view of a feeder for a feeder line installed on a high-rise building along a vertically extending extension line, and FIG. 2 is a side view of the feeder for a feeder line as viewed from the right side. FIG. 3 is a bottom view of the main part of the feeder for wire feeder.

  As shown in FIGS. 1, 2, and 3, a feeder for wire feeder 1 includes a base 3 fixed to a building 2 such as a high-rise building, and a feeder 3 provided in the base 3 in the axial direction. A feeding mechanism 5 for feeding and a drive unit 6 connected to the feeding mechanism 5 and driving the feeding mechanism 5 are provided.

  The base 3 is made of a metal frame, and is detachably attached to a beam of the building 2 via fasteners (not shown) such as bolts and nuts.

  The feed mechanism 5 includes a pair of endless track mechanisms 7 arranged to face each other with the power supply line 4 interposed therebetween, and a pressing mechanism 8 for pressing the endless track mechanism 7 against the power supply line 4.

  As shown in FIGS. 2 and 5, the pressing mechanism 8 includes a pair of a gear box 9 provided in the base 3 and a gear (not shown) in the gear box 9, and a male screw formed on the outer periphery. The clamp shaft 10 includes a movable frame 11 that moves along the clamp shaft 10 when the clamp shaft 10 is rotated by being screwed into the clamp shaft 10. A pair of gears for transmitting power to each clamp shaft 10 is rotatably provided in the gear box 9. The gears are meshed with each other and rotate the pair of clamp shafts 10 in opposite directions. The male screws formed on the pair of clamp shafts 10 are formed so as to be opposite to each other, and the movable frame 11 is fed in the same direction even when the clamp shaft 10 rotates in the opposite direction. . One clamp shaft 10 is provided with a pressing sprocket 12. The pressing sprocket 12 is connected to a pressing motor 14 through a pressing endless chain 13 and is rotated by receiving the power of the pressing motor 14.

  As shown in FIGS. 1, 3, and 4, the endless track mechanism 7 is provided on the movable frame 11 and extends in the feeding direction of the feeder 4, and is rotatably provided at both ends of the support frame 15. An endless track 18 comprising a pair of parallel rotary shafts (shafts) 16, a feed sprocket 17 provided on these rotary shafts 16 and rotating integrally with the rotary shaft 16, and an endless chain wound around these feed sprockets 17. And a plurality of cable grips 19 provided on the endless track 18 along the circulation direction for gripping the feeder 4. One rotating shaft 16 is provided with a bevel box 20 for transmitting power from the drive unit 6 to the one rotating shaft 16. The feed sprockets 17 are provided in two stages at intervals in the axial direction on the respective rotary shafts 16. The endless track 18 is provided in two stages so that the same-stage feed sprockets 17 are connected to each other independently, and the endless track 18 is infinitely opposed when the feed line 4 is sandwiched between the endless track mechanisms 7. The endless tracks 18 between the track mechanisms 7 are arranged to face each other with the feeder 4 interposed therebetween.

  The cable gripping portion 19 is provided on a pair of endless tracks 18 and circulates integrally with the endless track 18, and the cable gripping portion main body 21 provided in the cable gripping portion main body 21 is formed in an arc shape so as to grip the feeder 4. Part 22. The cable gripping part main body 21 is made of aluminum and is formed in a block shape extending in parallel with the rotation shaft 16. The receiving portion 22 is divided into two in the circumferential direction of the power supply line 4 between the endless track mechanisms 7, and is provided on the cable gripping body 21 so as to be swingable about an axis parallel to the power supply line 4. As a result, when the receiving portion 22 is pressed against the power supply line 4, it swings according to the unevenness of the power supply line 4, the hardness of the contacted part, etc., and presses the outer periphery of the power supply line 4 evenly. ing.

  Further, the divided receiving portions 23 obtained by dividing the receiving portion 22 in the circumferential direction are each made of aluminum and have a receiving surface 24 for gripping the outer periphery of the feeder line 4. The receiving surface 24 is formed to have a length of about ¼ circumference of the feeder line 4 having a diameter of 15 cm. The receiving surface 24 is provided with a buffer material 25 that abuts against the power supply line 4, and absorbs unevenness and hardness differences of the power supply line 4. The cushioning material 25 is made of a rubber sheet and is baked on the entire surface of the receiving surface 24.

  Each of the split receiving portions 23 is integrally provided with a bracket portion 27 that is swingably attached to the cable gripper main body 21 via a pin 26, and the split receiving portion 23 is attached to one of the swing directions. A spring 28 is provided for biasing. Specifically, the spring 28 is a coil spring. The spring 28 is provided in a compressed state between the split receiving part 23 extending from the pin 26 along the cable gripping part main body 21 and the cable gripping part main body 21. Thereby, when the pair of split receiving portions 23 are not in contact with the power supply line 4, the split receiving portions 23 provided on the same cable gripping portion main body 21 are always kept in an open posture.

  In addition, a plurality of cable gripping portions 19 are in contact with the power supply line 4 at the same time, and the power supply line 4 is gripped over a wide area. Specifically, the length from the cable gripping portion 19 at the upstream end to the cable gripping portion 19 at the downstream end in the feeding direction is set to 40 cm among the cable gripping portions 19 that simultaneously contact the power supply line 4.

  As shown in FIGS. 1 and 2, the drive unit 6 includes an electric motor (not shown) and a pair of flexible shafts 30 connected to the electric motor via a speed reducer (not shown). These flexible shafts 30 are designed to rotate reversely at the same rotational speed. The pair of flexible shafts 30 are connected to the bevel boxes 20 of the separate endless track mechanisms 7 in a posture orthogonal to the rotating shaft 16.

  Next, a method for extending the feeder line 4 using the feeder for wire feeder 1 will be described.

  As shown in FIG. 7A, when the feeder 4 is extended from a predetermined floor of the building 2 such as a high-rise building to the antenna 31 at the top, first, the feeder 1 is extended to the building 2; Equipment necessary for wire drawing work such as winch 32 will be installed.

  Specifically, the power supply line 4 wound around the winding drum 33 is provided on a predetermined floor of the building 2 so that it can be fed out. The winding drum is assumed to have a manual brake, and if the winding is loosened, the brake may be applied as appropriate. In addition, a plurality of feeders 1 for power supply lines are disposed along a wire extending path 34 that extends upward and bends from the winding drum 33. At this time, the arrangement position of the feeder for wire feeder 1 is set so as to be before and after the bent portion 36 of the wire path 34. However, when the extension path 34 is continuously bent in different directions, a series of bends is defined as one bent portion 36. The feeder for wire feeder 1 is in a state where the endless track mechanisms 7 are separated from each other in advance. The feeder 1 for the power supply line closest to the winding drum 33 is used for horizontal drawing, and is installed for the purpose of drawing the power supply line 4 from the winding drum 33. Further, each feeder for wire feeder 1 is connected to the centralized controller 35. The centralized controller 35 is for collectively controlling the feeders 1. The centralized controller 35 is configured to permit / prohibit the tightening by the pressing motor 14 for each feeder 1 for each feeder line. It comes to prevent. Further, the centralized controller 35 is capable of adjusting the speed of ON / OFF and feeding of the feeder for wire feeder 1 to be operated. The centralized controller 35 has a display unit (not shown) that displays the number of meters that the feeder line drawing machine 1 in operation sends out per minute. Furthermore, the winch 32 is installed in the building 2, the guide wire 37 connected to the winch 32 is disposed on the extension path 34, and the tip of the guide wire 37 is the tip of the feed line 4 in the feeding direction. Connecting. Further, as shown in FIG. 7B, a guide roller 38 for guiding the power supply line 4 is provided at the bent portion 36 of the extended line 34. The order of installing the devices in the building 2 may be changed.

  Next, the power supply wire 4 wound around the winding drum 33 is sequentially sent to the power supply wire drawing machine 1 on the wire drawing path 34 while being fed out from the winding drum 33 to be extended. At this time, by winding the guide wire 37 with the winch 32, the feed wire 4 is extended while pulling the tip of the feed wire 4 with the guide wire 37. Thereby, it can prevent that the front-end | tip of the electric power feeding line 4 remove | deviates from on the extension line 34. FIG.

  As shown in FIG. 6, the power supply line 4 that reaches the power supply line extender 1 passes between the endless track mechanisms 7 of the power supply line extender 1 while its tip is pulled by the guide wire 37. A connector 39 for connecting to the antenna 31 is provided at the tip of the feed line 4. However, since the endless track mechanisms 7 are separated from each other in advance, the feed line 4 can easily pass between the endless track mechanisms 7. . When the feeder line 4 passes between the endless track mechanisms 7, an operation button (not shown) of the feeder extension device 1 is operated so as to press the pair of endless track mechanisms 7 against the feeder line 4. As shown in FIGS. 2 and 5, the pressing motor 14 is driven to rotate and the clamp shaft 10 is rotated, so that the pair of movable frames 11 move in directions close to each other. As a result, the endless track mechanism 7 is pressed against both sides of the feeder line 4, and both sides of the feeder line 4 are gripped by the plurality of cable gripping portions 19. Each of the split receiving portions 23 of the cable gripping portion 19 swings according to the unevenness of the cable gripping portion 19, so that the power supply wire 4 can be gripped by a plurality of receiving surfaces 24 without hitting the power supply wire 4. The entire arc-shaped receiving surface 24 can be gripped, and the feeder 4 can be prevented from being bent or dented by the pressure from the endless track mechanism 7.

  After that, the central controller 35 drives the drive unit 6 of the feeder for wire feeder 1 that holds the feeder 4 so as to send the feeder 4 along the extension path 34 in the forward direction. The power of the drive unit 6 is transmitted to the rotary shafts 16 of the respective endless track mechanisms 7 through the flexible shafts 30 and the endless tracks 18 facing each other are circulated and driven in opposite directions. As a result, the cable gripping part 19 that grips the power supply line 4 is moved in the forward direction along the extended path 34, and the power supply line 4 is sent. At this time, for example, if the feeder line 4 is gripped by a general shape of an endless track, a force is applied to the entire gripping length direction, so that a difference in gripping force occurs due to variations in the diameter of the feeder line 4, Although it is conceivable that an excessive force is locally applied to the feeder line 4, the split receiving portion 23 swings so as to follow the outer peripheral shape of the feeder line 4, so that the diameter of the continuously flowing feeder line 4 varies. The power supply line 4 can be gripped with a predetermined gripping force while corresponding to the above, and a large force is not locally applied to the power supply line 4. In addition, the pair of split receiving portions 23 provided in the same cable gripping portion main body 21 are closed when the split receiving portion 23 extending along the cable gripping portion main body 21 comes into contact with the power supply line 4. The feed line 4 is not rubbed.

  When the power supply line 4 reaches the bent portion 36 of the extension path 34, the power supply line 4 is bent along the guide roller 38. In the bent portion 36, the bending position of the feeder line 4 moves during the extension, and radial force may be applied to the feeder line 4 between the endless track mechanisms 7, but the split receiving portion 23 swings. Thus, the force of the feeder line 4 can be absorbed, so that an unreasonable force is not applied to the feeder line 4 between the endless track mechanisms 7.

  Thereafter, the same procedure as described above is repeated to extend the feed line 4 to the position of the antenna 31.

  In addition, as shown in FIG. 7C, when it is necessary to extend the power supply line 4 to the building 2 below the winding drum 33, the length of the power supply line 4 is increased by that length. Then, after extending the feeder line 4 over the entire length of the extension line 34, the feeder line 4 is further sent upward to discharge the end of the feeder line 4 from the winding drum 33, and the end of the feeder line 4 is It is preferable to feed the feeder 4 to the building 2 below the winding drum 33 by sending it downward with each feeder 1.

  In this way, the feeder 1 is connected to the base 3 fixed to the building 2, the feed mechanism 5 provided in the base 3 for feeding the feed line 4 in the axial direction, and the feed mechanism 5. A drive unit 6 that drives the feed mechanism 5, and the feed mechanism 5 is provided with a pair of endless tracks 18 arranged to face each other with the power supply line 4 interposed therebetween, and a plurality of feed mechanisms 5 provided along the circulation direction of the endless track 18. And a cable gripping part 19 having a receiving part 22 formed in an arc shape so as to grip the power supply line 4. The receiving part 22 is divided in the circumferential direction of the power supply line 4 and is connected to the cable gripping part main body 21. Since it is provided so as to be able to swing around an axis parallel to the power supply line 4, it is easily installed without damaging the power supply line 4 even in a building 2 in which the power supply line 4 needs to be bent at a plurality of locations. it can.

  Since the receiving portion 22 is provided with the buffer material 25 that contacts the power supply line 4, it is possible to prevent the power supply line 4 from being damaged more satisfactorily.

  Since the receiving portion 22 is provided with a spring 28 that urges the receiving portion 22 in one of the swing directions, the receiving portion 22 that is not in contact with the power supply line 4 is allowed to swing freely due to vibration or the like. Can be prevented. Further, since the spring 28 is provided between each of the divided receiving portions 22 (divided receiving portions 23) and the cable gripping portion main body 21, the divided receiving portions 23 can be urged with a simple structure.

  In addition, the building 2 is provided so that the power supply line 4 wound around the winding drum 33 can be fed out, and the power supply line drawing machine 1 extends from the winding drum 33 upward and bends along the extension path 34 that is bent. A plurality of power supply wires 4 are wound around the take-up drum 33 while being fed out from the take-up drum 33 and sequentially fed to the wire feeder 1 for the power supply wire 34 on the wire extension path 34 to be extended. Even if it is a building 2 that needs to be bent and installed at a plurality of locations, the feeder 4 can be easily installed.

  Since the feeder 1 is arranged before and after the bent portion 36 of the extension path 34, the feeder 4 can be sent stably and easily even in the bent portion 36.

  When the feeder 4 is sent to the feeder for wire feeder 1, a guide wire 37 is connected in advance to the leading end of the feeder 4 in the feeding direction, and the guide wire 37 is arranged on the extension path 34 in advance. Since the feed line 4 is extended while pulling the tip of the feed line 4 with the guide wire 37, it is possible to prevent the tip of the feed line 4 from coming out of the extension path 34 during the extension. Can be stably wired.

  In addition, after the feeder line 4 is extended over the entire length of the extension line 34, the feeder line 4 is further moved upward to discharge the terminal end of the feeder line 4 from the winding drum 33. In order to extend the power supply line 4 to the building 2 below the winding drum 33 by sending it downward by the power line drawing machine 1, the power supply line 4 is also extended to the building 2 below the winding drum 33. Even in this case, the feeder line 4 can be easily extended. The antenna 31 can be connected to a transmitter (not shown) or the like with a single feed line 4, and the performance of the feed line 4 is reduced at the connection portion as in the case where a plurality of feed lines 4 are connected. Can be prevented.

  In addition, although the receiving part 22 shall be divided into 2 in the circumferential direction of the feeder line 4, it is good also as what is divided | segmented into three or more.

  Further, although the feeding sprocket 17 and the endless track 18 are provided in two stages, they may be provided in a single stage, or may be provided in a plurality of three or more stages.

  The movable frame 11 is screwed to a pair of clamp shafts 10, but may be screwed to three or more clamp shafts 10, and may be screwed to one clamp shaft 10. Also good. However, when it is to be screwed into one clamp shaft 10, guide means for guiding the movable frame 11 may be provided in the base 3 or the gear box 9 so that the movable frame 11 does not rotate together with the clamp shaft 10. .

  Although the buffer material 25 is made of a rubber sheet, it may be made of another resin sheet.

A verification experiment was conducted on the conditions of use of the feeder for the single operation / normality test of the feeder for the feeder. Describe test contents and results. In the experiment, the feeder for the feeder line was set to No. from the winding drum side. 1, no. 2, ... 12 were assigned numbers. The spare power line extension machine is numbered 13.
1. Influence characteristics at the time of feeding line construction by using a feeder for the feeder line

2. 2. Test of feeder unit for feeder line 2-1. Compression characteristics a. Electrical characteristics [Summary of test]
After pressing the drum-carrying power supply line (CX-120D) with a power supply wire drawing machine (No. 2) using a pressing motor, the clamp shaft is tightened with a torque wrench (200 kg · f to 1000 kg · f). The electric characteristics (VSWR / characteristic impedance) of the feeder line caused by the clamp compression were confirmed.
[Target machine] Feeder extension machine No. 2
[Summary of test results]
In the torque wrench 200 kg · f to 1000 kg · f retightening, neither VSWR nor characteristic impedance was changed, and there was no abnormality. No sheath kinking or corrugated deformation.

b. Tension check [Summary of test]
Set the tension meter with the feeder line (L3.2m) pressed and set. Check the tension (MAX value before sliding out) by operating the wire feeder.
Tighten the torque with “Motor pressing only”, “Motor pressing + 500 kg · f”, “Motor pressing + 600 kg · f”, and check each tension at that time. No. Only Unit 9 was checked with and without water.

  * Although 200 kg · f torque was tightened on the clamp shaft while the motor was pressed, the test was conducted at 500 kg · f · 600 kg · f because it was already 200 kg · f.

* Not applicable because the clamp shaft may be deformed by horizontal stress when 1000kg · f torque is applied to the clamp shaft.
[Target machine]
All 8 feeders for feeders (No. 1, 7, 8, 9, 10, 11, 12, spare (13)
[Summary of test results]
Confirm that there is a tension of 430 kg (min value) in the “motor pressing state (tightening torque 0 kg · f) / with water”.

2-2. Gripping force characteristics a. Gripping force confirmation [Summary of test]
A feeder for the feeder is installed on the scaffold in a vertical position. Set the weight while pressing the power supply line (L3.2m: W25kg). Check the total load when sliding from the cable gripping part by increasing 10kg from 350kg (feed line + weight).
[Target machine]
No. of feeder for power supply line No. 13 (spare machine)
[Summary of test results]
"Motor is pressed only", slipping at a total load of 370kg. There is slipping at a total load of 420 kg in the “motor pressing + torque 500 kg · f” state.

2-3. Drive system measurement during no-load operation of feeder for wire feeder [drive system measurement]
・ Check the rotational vibration noise of the drive speed reducer (bevel box) and the bearing part of the endless track mechanism with a bearing checker: 2.0G> 0.23G (MAX value) Good ・ Construction speed (2m / min, 3m / Check the torque, rotation speed, and load factor of the servo amplifier during no-load operation at min): There is no variation in each machine, good drive at a constant speed, measure the shaft rotation speed with a handy tachometer, and servo amplifier Compared with the displayed rotation speed: good when the rotation speed matches, confirmation of emergency stop function when all units are linked: good emergency stop Summary

  As shown in Table 6, as a characteristic due to the compressive force applied to the power supply line, even if the tightening torque of the pressing motor was tightened to 1000 kg · f, fluctuations in the cable electrical and mechanical characteristics of the power supply line were not observed. In addition, in the unit test, it was confirmed that there was no variation in the motor speed of each machine-constant speed. Considering the cable slipping tendency of the tension test and gripping force test and the actual measured values, it is possible to secure the power supply line to 370 kg or less with only the pressing motor (tightening torque 0 kg · f). By installing the wire drawing machine installation interval within the specified range (allowable tension of power supply line ÷ mass per unit length), it can be installed without adversely affecting the cable characteristics.

DESCRIPTION OF SYMBOLS 1 Feeder wire feeder 2 Building 3 Base part 4 Feeder line 5 Feed mechanism 6 Drive part 18 Endless track 19 Cable grip part 21 Cable grip part main body 22 Receiving part 25 Buffer material 28 Spring 33 Winding drum 34 Extending path 36 Bending part 37 Guide wire

Claims (9)

A base fixed to the building;
A feed mechanism provided at the base for feeding the feeder in the axial direction;
A drive unit connected to the feed mechanism and driving the feed mechanism;
The feeding mechanism includes a pair of endless tracks arranged opposite to each other so as to sandwich the power supply line, and a receiving portion formed in an arc shape so as to grip the power supply line by being provided on the endless track along the circulation direction. A cable gripping part having
The feeder is divided in the circumferential direction of the feeder line, and is provided on the cable gripper body so as to be swingable about an axis parallel to the feeder line.   The wire feeder for a feeder line according to claim 1, wherein the cable gripping portion main body is provided on the endless track and circulates integrally with the endless track.   The wire feeder for a power feed line according to claim 1 or 2, wherein the receiving portion is provided with a buffer material that comes into contact with the power feed line.   The wire feeder for a feed line according to any one of claims 1 to 3, wherein the receiving portion is provided with a spring that biases the receiving portion in one of the swing directions.   5. The feeder for a feeder line according to claim 4, wherein the spring is provided between each of the divided receiving portions and the cable gripping portion main body.   The high-rise building is provided with a power supply wire wound around a winding drum so that it can be fed out, and the power supply wire extension device according to any one of claims 1 to 5 extends upward from the winding drum and bends. A plurality of feeders are provided along the wire path, and the feeders wound around the winding drum are sequentially fed to the feeder for the feeder line on the extension path while being drawn out from the winding drum. How to wire the wires.   The method for extending a feeder line according to claim 6, wherein the feeder for a feeder line is disposed before and after a bent portion of the extension line.   When feeding the feeder to the feeder, the guide wire is connected in advance to the leading end of the feeder in the feeding direction, and the guide wire is arranged on the extension path in advance. The method of extending a power supply line according to claim 6 or 7, wherein the power supply line is extended while pulling the tip of the electric wire with a guide wire.   After extending the feeder line over the entire length of the extension path, the feeder line is further sent upward to discharge the end of the feeder line from the winding drum, and the end of the feeder line is connected to the feeder line. The method of extending a power supply line according to any one of claims 6 to 8, wherein the power supply line is extended downward to a high-rise building below the winding drum by a wire drawing machine.