Strip-shaped material supply device

Abstract

The strip material supplied to the pipe-making machine can be appropriately fed out from the drum in accordance with the pipe-making speed. [Solution] The strip member supply device for supplying a strip member 4 to a pipe-making machine via a manhole comprises a drum 10 for winding the strip member 4, a rotational drive means 20 for rotating the drum 10 to feed the strip member 4 into the manhole, and a position detection device 30 for detecting the position of the strip member 4 fed out from the drum 10. The position detection device 30 comprises a support, a movable arm 32 rotatably supported by the support, a roller assembly 33 (following part) provided at the tip of the movable arm 32 that allows the strip member 4 to pass through and follows changes in the position of the strip member 4, and photoelectric sensors 40a, 40b (sensing means) for detecting the position of the roller assembly 33. The rotational drive means 20 controls the rotation of the drum 10 based on position detection information from the position detection device 30.

Description

Technical Field

[0001] The present invention relates to an apparatus for supplying a strip member to a manhole in a process of manufacturing a rehabilitation pipe for rehabilitating an existing pipe.

Background Art

[0002] In order to rehabilitate an existing pipe such as an aging sewer pipe, it is known to line the rehabilitation pipe on the inner circumference of the existing pipe. Taking the method disclosed in Patent Document 1 as an example, a rehabilitation pipe is manufactured by winding a strip member (profile) spirally by a pipe manufacturing machine disposed in a manhole and joining adjacent side edges with a one-week shift. The strip member is supplied from a strip member supply device installed on the ground near the manhole to the pipe manufacturing machine. The strip member supply device has a drum that holds a polymer in which the strip members are stacked, and a rotational drive means for rotating the drum.

[0003] The strip member is fed out from the polymer held by the drum and supplied to the pipe manufacturing machine through the manhole. It is necessary to match the feeding of this strip member with the pipe manufacturing speed of the pipe manufacturing machine. If the feeding is too fast, slack of the strip member will occur, and the strip member may contact the ground or other structural members, or the strip members may become entangled with each other. Also, if the feeding is too slow, the strip member will be pulled and a load will be applied to the drum, making the support of the drum unstable or causing an obstacle to the pipe manufacturing of the pipe manufacturing machine. Therefore, an operator monitors the strip member being fed out in the vicinity of the drum. When the feeding of the strip member is insufficient, the rotational drive means is turned on by operating a foot switch or the like while pulling the strip member to execute the feeding of the strip member. When the fed strip member is greatly slack, the rotational drive means is turned off to stop the feeding of the strip member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] The aforementioned method for controlling the unwinding of the strip-shaped member placed a heavy burden on the workers. [Means for solving the problem]

[0006] To solve the above problems, the present invention relates to a process for manufacturing a rehabilitated pipe, which is made up of a spiral pipe, by connecting adjacent side edges of a strip-shaped member offset by one full turn, in order to line the inner circumference of an existing pipe with the rehabilitated pipe, and provides a strip-shaped member supply device for supplying the strip-shaped member to a manhole, The invention comprises a drum for holding the polymer of the strip-shaped member, which is formed by winding the strip-shaped member multiple times; a rotational drive means for rotating the drum to feed the strip-shaped member into the manhole; and a position detection device for detecting the position of the strip-shaped member fed out from the polymer, wherein the rotational drive means controls the rotation of the drum based on position detection information from the position detection device. With this configuration, the unwinding of the strip-shaped member can be appropriately and automatically controlled based on the position detection information of the strip-shaped member, thus eliminating or reducing the workload on workers involved in unwinding the strip-shaped member.

[0007] Preferably, the position detection device comprises a support, a movable arm rotatably supported by the support, a tracking unit provided at the tip of the movable arm that passes the strip-shaped member and follows changes in the position of the strip-shaped member, and a sensor means for detecting the position of the tracking unit. With this configuration, although the structure is simple, the tracking part follows the positional change of the strip-shaped member, so it is possible to accurately respond to the positional change of the strip-shaped member and control the unwinding of the strip-shaped member.

[0008] In one embodiment, the sensor means is configured as a distance sensor provided on the tracking portion for measuring the distance between the tracking portion and the outer circumference of the polymer. In other embodiments, the sensor means is comprised of a distance sensor provided on the tracking unit for measuring the distance between the tracking unit and the ground.

[0009] In one embodiment, the position detection device further comprises a biasing means for biasing the movable arm, the tracking unit has a horizontal roller having a rotation axis parallel to the rotation axis of the drum, and the tracking unit follows the change in position of the strip member by the horizontal roller contacting the strip member under the biasing force of the biasing means.

[0010] Preferably in the above embodiment, the strip-shaped member is fed out from below the polymer, passes on the opposite side of the manhole from the polymer, and then passes above the polymer before entering the manhole, the movable arm is rotatable in the vertical direction, the weight of the movable arm is provided as the biasing means, and the horizontal roller of the tracking unit contacts the upper surface of the strip-shaped member below the polymer. This configuration does not require a separate component as a biasing means.

[0011] More preferably, the following section is positioned in the center of the rotation axis direction of the drum, and the following section further includes another horizontal roller having a rotation axis parallel to the rotation axis of the drum and facing the horizontal roller in the thickness direction of the strip member, and a pair of vertical rollers positioned in front of and / or behind the direction of passage of the strip member as seen from these horizontal rollers and facing the width direction of the strip member. This configuration allows the strip-shaped member to be smoothly introduced into the tracking section from the polymer spreading in the direction of the drum's rotation axis. Furthermore, even if the position of the strip-shaped member changes rapidly, the tracking section can stably follow the strip-shaped member.

[0012] In another embodiment, the following portion restricts the relative displacement of the strip-shaped member in the thickness direction and width direction. According to this configuration, a structure that omits the biasing means of the movable arm can be adopted, and the detection position of the belt-like member can be set without restrictions.

[0013] Preferably, the position detection device further has a buffer member disposed on the polymer side of the follower portion, and at least the polymer-side portion of this buffer member is formed of a resin material. According to this configuration, even if the belt-like member suddenly approaches the polymer, since the resin material of the buffer member hits the outer periphery of the polymer, it is possible to prevent the follower portion from hitting the outer periphery of the polymer and damaging the belt-like member located on the outer periphery of the polymer.

Effects of the Invention

[0014] According to the present invention, in the pipe manufacturing process of the rehabilitation pipe, by automatically adjusting the feeding of the belt-like member from the polymer held on the drum, the work of the operator for feeding the belt-like member can be omitted or the burden on the operator can be reduced.

Brief Description of the Drawings

[0015] [Figure 1] It is a longitudinal sectional view schematically showing the process of rehabilitating an existing pipe using the belt-like member supply device and the pipe manufacturing machine according to an embodiment of the present invention. [Figure 2] It is a side sectional view schematically showing the belt-like member supply device. [Figure 3] It is a schematic view of the belt-like member supply device as viewed from the A direction in FIG. 2. [Figure 4] It is a side view of the position detection device for the belt-like member in the belt-like member supply device. [Figure 5] It is an enlarged side view showing the arrangement of the rollers in the roller assembly of the position detection device in FIG. 4. [Figure 6] It is an enlarged plan view of the roller assembly. [Figure 7] It is an enlarged front view of the roller assembly as viewed from the longitudinal direction of the belt-like member.

Modes for Carrying Out the Invention

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an aging existing pipe 1 to be rehabilitated. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried underground, but it may also be a water supply pipe, an agricultural water pipe, a gas pipe, a water conduit for hydroelectric power generation, a tunnel, or the like. One pipe end of the existing pipe 1 is connected to the starting-side manhole 2A, and the other pipe end is connected to the reaching-side manhole 2B.

[0017] The existing pipe 1 is rehabilitated by lining a rehabilitation pipe 3 made of a spiral pipe on its inner circumference. The rehabilitation pipe 3 is manufactured by winding a strip member 4 (profile) in a spiral shape and fitting and joining the side edges of the strip members 4 that are one turn apart from each other in a male-female manner. The strip member 4 of the present embodiment is made of a synthetic resin such as polyvinyl chloride (PVC) or polyolefin, and a reinforcing material made of metal or FRP may be incorporated as necessary.

[0018] The strip member 4 has, for example, a cross-sectional shape shown in FIG. 7, and includes a base portion 4a having one smooth surface, female fitting portions 4b and 4c disposed on one side edge portion in the width direction of the base portion 4a, and male fitting portions 4d and 4e disposed on the other side edge portion of the base portion 4a. By fitting the male fitting portions 4d and 4e that are one turn apart into the female fitting portions 4b and 4c with a pipe manufacturing machine 5 described later, a rehabilitation pipe 3 made of a spiral pipe is manufactured. A reinforcing portion 4f having a cross-sectional U-shape is formed on the base portion 4a on the side opposite to the smooth surface.

[0019] In the present embodiment, the rehabilitation pipe 3 is manufactured by an expander pipe manufacturing method. Briefly described while referring to FIG. 1, a push-type pipe manufacturing machine 5 is installed at the bottom of the starting-side manhole 2A. On the ground near the starting-side manhole 2A, a strip member supply device 6 for supplying the strip member 4 to the pipe manufacturing machine 5 is arranged, a wire winch 7, a pump 8 for supplying a slow-curing sealing agent, and a hydraulic unit 9 for supplying hydraulic pressure to the pipe manufacturing machine 5 are arranged.

[0020] In the pipe-making machine 5, a rehabilitated pipe 3 with a smaller diameter than the existing pipe 1 is manufactured using a strip-shaped member 4. In this pipe-making process, a wire 7a drawn from a wire winch 7 is incorporated into the fitting portion of the strip-shaped member 4, and a sealing agent supplied from a pump 8 is filled into one of the female fitting portions 4b of the strip-shaped member 4. The other female fitting portion 4c of the strip-shaped member 4 is pre-filled with hot-melt adhesive, and this hot-melt adhesive maintains the small diameter of the rehabilitated pipe 3.

[0021] When the tip of the small-diameter rehabilitation pipe 3 reaches the end of the existing pipe 1 facing the receiving manhole 1B, the wire winch 7 is driven to pull the wire 7a, cutting the male fitting part 4e fitted into the female fitting part 4c. As a result, the restraining force of the fitting part on the side edge of the strip member 4 is weakened, causing the rehabilitation pipe 3 to expand in diameter and lining the inner circumference of the existing pipe 1 in a way that makes it adhere tightly to it.

[0022] <Configuration of the strip-shaped material supply device> As shown in Figures 2 and 3, the strip member supply device 6 includes a drum 10 that holds the polymer 4X of the strip member 4, which is formed by winding strip members 4 together; a rotational drive means 20 that supports the drum 10 and rotates to feed out the strip member 4 from the outer circumference of the polymer 4X; and a position detection device 30 that detects the position of the strip member 4 being fed out from below the polymer 4X held by the drum 10.

[0023] The drum 10 has a cylindrical body 11 that holds the polymer 4X, and disc-shaped flanges 12 provided at both ends of the body 11. The polymer 4X is constructed by winding multiple strip-shaped members 4 in multiple rows in the direction of the rotation axis of the drum 10 and multiple layers in the radial direction.

[0024] The rotational drive mechanism 20 includes a support base 21 installed on the ground or the like, and four rollers 22 rotatably mounted on the support base 21. The flange 12 of the drum 10 rests on these rollers 22, thereby supporting the drum 10 in a rotatable manner. In this embodiment, at least one of the four rollers 22 is driven by a motor 25 to rotate the drum 10.

[0025] The position detection device 30 comprises a support column 31 installed on the opposite side of the manhole 1A from the drum 10, a movable arm 32 supported at the upper end of the support column 31 so as to be rotatable in the vertical direction, and a roller assembly 33 (following part) equipped at the tip of the movable arm 32. The lower end of the support column 31 is fixed to, for example, a support base 21 via a bracket 34. The roller assembly 33 is located on the underside of the polymer 4X and is positioned in the center in the direction of the rotation axis of the drum 10.

[0026] <Structure of the roller assembly of the position detection device> As shown in Figures 4 to 7, the roller assembly 33 of the position detection device 30 grips the strip-shaped member 4 so that it can pass through. More specifically, the roller assembly 33 comprises a frame 35 supported by the tip bracket 32a of the movable arm 32. The frame 35 has a base portion 35a extending in the width direction of the strip-shaped member 4, and a pair of support portions 35b connected at right angles to the base portion 35a at both ends of the base portion 35a (both ends in the width direction of the strip-shaped member 4).

[0027] The roller assembly 33 further includes a pair of horizontal rollers 36 rotatably supported on the frame 35, and two pairs of vertical rollers 37 rotatably supported on the frame 35. The pair of horizontal rollers 36 are rotatably supported so as to span across the pair of support portions 35b, have rotation axes parallel to the rotation axis of the drum 10, extend in the width direction of the strip-shaped member 4, and are spaced apart from each other vertically. The two pairs of vertical rollers 37 have rotation axes that are perpendicular to the rotation axis of the horizontal roller 36 (and perpendicular to the strip-shaped member 4). Each pair of vertical rollers 37 is spaced apart from each other in the width direction of the strip-shaped member 4. One pair of vertical rollers 37 is positioned on the front side in the direction of passage of the strip-shaped member 4 as viewed from the horizontal roller 36, and the other pair of vertical rollers 37 is positioned on the rear side in the direction of passage of the strip-shaped member 4 as viewed from the horizontal roller 36.

[0028] As shown in Figure 7, a passage 38 for the passage of the strip-shaped member 4 is defined by a pair of horizontal rollers 36 and two pairs of vertical rollers 37 of the roller assembly 33. The pair of horizontal rollers 36 face each other in the thickness direction of the strip-shaped member 4, and each pair of vertical rollers 37 face each other in the width direction of the strip-shaped member 4, with the strip-shaped member 4 in between. Preferably, the distance between the pair of horizontal rollers 36 is up to twice the thickness of the strip-shaped member 4, and preferably, the distance between the pair of vertical rollers 37 is up to twice the width of the strip-shaped member 4.

[0029] In this embodiment, the movable arm 32, which is made of iron or the like, is biased downward by its own weight (biasing means). As a result, the upper horizontal roller 36 of the roller assembly 33 rests on the strip-shaped member 4, and the position of the roller assembly 33 changes in accordance with the position of the unwound strip-shaped member 4. The lower horizontal roller 36 plays a role in preventing the strip-shaped member 4 from coming off the roller assembly 33 during rapid downward position changes of the strip-shaped member 4. The two pairs of vertical rollers 37 play a role in smoothly introducing the strip-shaped member 4 from the polymer 10, which spreads in the direction of the rotation axis of the drum 10, into the roller assembly 33 which is positioned in the center in the direction of the rotation axis.

[0030] A sensor unit 40 is installed on the outside of one support portion 35b of the frame 35 of the roller assembly 33. Photoelectric sensors 40a and 40b (distance sensors; sensor means) are provided at the upper and lower ends of this sensor unit 40 to detect the position of the strip-shaped member 4 passing through the roller assembly 33. The upper photoelectric sensor 40a turns on and off depending on the distance to the outer surface of the polymer 4X held by the drum 10, and the lower photoelectric sensor 40b turns on and off depending on the distance to the ground. These on / off signals are sent to the drive circuit 25a of the motor 25 as shown in Figure 2. The photoelectric sensors 40a and 40b essentially function as distance sensors, and their on / off signals essentially contain distance information.

[0031] The on / off operation of the photoelectric sensors 40a and 40b preferably has hysteresis characteristics, as will be described later. In this embodiment, photoelectric sensors 40a and 40b are provided above and below to serve both the two control methods described later, but the sensor unit 40 only needs to have one of the photoelectric sensors 40a or 40b to execute either of the control methods.

[0032] A cushioning member 50 is positioned above the roller assembly 33. This cushioning member 50 extends parallel to the upper horizontal roller 36 and is made by laminating a narrow steel plate 50a on the bottom and a resin material 50b on the top. The cushioning member 50 is supported by the tip bracket 32a of the movable arm 32 via a bracket 51 fixed to one end and extending downward, and by the support portion 35b of the frame 35 of the roller assembly 33 via a bracket 52 fixed to the other end and extending downward. Resin material 53 is also attached to the side edges of these brackets 51 and 52.

[0033] In this embodiment, the guide means 60 is positioned on the opposite side of the manhole 1A from the drum 10. This guide means 60 is supported by a support column or the like (not shown), and is positioned above the rotation axis of the drum 10 and away from the polymer 4X. The guide means 60 has a pair of guide rollers 61 that guide the strip-shaped member 4. This guide means 60 may be omitted.

[0034] <Unwinding of strip-shaped material in the pipe manufacturing process> In the pipe-making process, the strip-shaped member 4 is unfurled from the bottom of the polymer 4X held in the drum 10, passes on the opposite side of the manhole 1A from the perspective of the polymer 4X, then passes on the top side of the polymer 4X, changes direction downwards, enters the manhole 2A, and is supplied to the pipe-making machine 5. The strip-shaped member 4 passes through the roller assembly 33 of the detection device 30 and between the pair of guide rollers 61 of the guide means 60.

[0035] The feeding of the above-mentioned belt-like member 4 is carried out by the rotation of the roller 22 of the rotational driving means 20 and the auxiliary pulling of the belt-like member 4 by the operator on the side of the manhole 1A. If the feeding speed is faster than the pipe manufacturing speed of the pipe manufacturing machine 5, the fed belt-like member 4 will sag greatly and may be damaged by contacting the ground or other equipment. Conversely, if the feeding speed is slower than the pipe manufacturing speed, the belt-like member 4 will be pulled from the pipe manufacturing machine 5 and a large load will be applied to the drum 10, and there is also a possibility that the drum 10 will come off the support base 21. In the present embodiment, based on the position detection information of the belt-like member 4 from the position detection device 30, the motor 25 rotationally drives the roller 22 to appropriately feed the belt-like member 4 in accordance with the pipe manufacturing speed, so the above-mentioned inconveniences do not occur. This will be described in detail below.

[0036] First, the rotation control of the drum 10 using the lower photoelectric sensor 40b will be described. When the feeding of the belt-like member 4 is stalled and the belt-like member 4 approaches the polymer 4X, the sag of the belt-like member 4 disappears, and the belt-like member 4 fed from under the polymer 4X moves upward. Following this, the movable arm 32 rotates upward, and the roller assembly 33 is displaced upward. When the distance between the photoelectric sensor 40b and the ground exceeds the set distance D1, the photoelectric sensor 40b turns off, and upon receiving this off signal, the motor 25 is driven. Thereby, the drum 10 is rotated, and the belt-like member 4 is fed from the polymer 4X. When the belt-like member 4 is fed excessively, the belt-like member 4 sags, the belt-like member 4 fed from under the polymer 4X moves downward, and moves away from the polymer 4X and approaches the ground. Following this, the movable arm 32 rotates downward by its own weight, and the roller assembly 33 is displaced downward. When the distance between the photoelectric sensor 40b and the ground is below the set distance D2 (D2 < D1), the photoelectric sensor 40b turns on, and upon receiving this on signal, the motor 25 stops driving. Thereby, the rotation of the drum 10 is stopped, and the feeding of the belt-like member 4 is stopped, so that as the pipe manufacturing of the pipe manufacturing machine 5 progresses, the sag of the belt-like member 4 is eliminated.

[0037] Next, the rotation control of the drum 10 using the upper photoelectric sensor 40a will be described. In this case, the buffer member 50 needs to be supported so as to be slidable in the vertical direction in the figure from the position in Figure 5, or fixed after being shifted vertically from the position in Figure 5, so as to be out of the optical path of the photoelectric sensor 40a. If the unwinding of the strip-shaped member 4 becomes stagnant, the strip-shaped member 4 approaches the polymer 4X, and in response, the movable arm 32 rotates upward, causing the roller assembly 33 to displace upward. When the distance between the photoelectric sensor 40b and the outer surface of the polymer 4X falls below the set distance D3, the photoelectric sensor 40a turns on, and the motor 25 is driven in response to this ON signal. As a result, the drum 10 rotates, and the strip-shaped member 4 is unwound from the polymer 4X. When the strip-shaped member 4 is dispensed excessively, it sags, and the strip-shaped member 4 dispensed from below the polymer 4X moves downward, away from the polymer 4X and closer to the ground. Following this, the movable arm 32 rotates downward due to its own weight, and the roller assembly 33 is displaced downward. When the distance between the photoelectric sensor 40a and the outer surface of the polymer 4X exceeds the set distance D4 (D4 > D3), the photoelectric sensor 40a turns off, and the motor 25 stops driving in response to this off signal. As a result, the rotation of the drum 10 stops, and the dispensing of the strip-shaped member 4 stops, so that the sag of the strip-shaped member 4 is eliminated as the pipe making process of the pipe making machine 5 progresses.

[0038] In the control of unwinding the strip-shaped member 4 based on the on / off signal from the photoelectric sensor 40a or photoelectric sensor 40b, if the strip-shaped member 4 unwinding from the bottom of the polymer 4X is suddenly displaced upward, it is conceivable that the unwinding of the strip-shaped member 4 may not be able to keep up with this sudden displacement. Even in this case, the resin material 50b of the cushioning member 50 will come into contact with the polymer 4X, and the roller assembly 33 will not come into contact with the polymer 4X, thus preventing damage to the outermost layer of the polymer 4X, the strip-shaped member 4.

[0039] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. The sensor means may be a distance sensor that measures the distance between the polymer or the ground and outputs this measured value. In this case, the rotational drive means includes a calculation and control means that compares this measured distance with a set distance and controls the motor. Alternatively, a sensor may be used that detects the rotation angle and tilt angle of the movable arm, thereby effectively detecting the position of the tracking unit.

[0040] Instead of controlling the motor by switching it on and off, the rotation speed of the motor may be controlled by the calculation and control means of the rotation control means based on detected position information (e.g., distance measurement) of the strip-shaped member, thereby controlling the unwinding speed of the strip-shaped member.

[0041] The movable arm may be rotationally biased by a biasing means such as a spring. In this case, the position of the tracking part of the position detection device (the detection position of the strip-shaped member) can be selected more freely. In a structure like the roller assembly of the above embodiment, where the tracking part is restricted from relative displacement of the strip-shaped member in the width direction and thickness direction, biasing means (including the weight of the movable arm) can be omitted, and the position of the tracking part of the position detection device (the detection position of the strip-shaped member) can be selected more freely.

[0042] A manhole can also be a vertical shaft that is inaccessible to workers or other people. The connection is not limited to a configuration in which the side edges of adjacent strip-shaped members are directly joined together by fitting or the like, but may also be a configuration in which the side edges of adjacent strip-shaped members are indirectly joined together via a connecting member.

[0043] Rehabilitated pipes may be manufactured manually within existing pipes without using a pipe-making machine. Even in this case, the strip-shaped members can be supplied appropriately by controlling the rotation of the drum in accordance with the pipe-making speed. [Industrial applicability]

[0044] This invention can be applied, for example, to a technology for rehabilitating existing pipes such as aging sewer pipes. [Explanation of Symbols]

[0045] 1 Existing pipe 2A Manhole 3 Rehabilitation pipe 4. Strip-shaped member Polymerization of 4X strip-shaped members 5 Pipe making machine 6. Strip-shaped member supply device 10 Drums 20 Rotary drive means 30 Position detection device 31 Support 32 movable arms 33 Roller assembly (following section) 36 Horizontal Rollers 37 Vertical rollers 40a, 40b Photoelectric sensor (distance sensor; sensor means) 50 Cushioning material 50b resin material

Claims

1. In the process of manufacturing a rehabilitated pipe, which is made up of a spiral pipe, by connecting adjacent side edges of a strip-shaped member offset by one full turn, in a strip-shaped member supply device that supplies the strip-shaped member to a manhole, A drum for holding the polymer of the strip-shaped member, which is formed by winding the strip-shaped member in layers, A rotational drive means that rotates the drum to feed out the strip-shaped member into the manhole, A position detection device for detecting the position of the strip-shaped member unwound from the polymer, Equipped with, A strip-shaped member supply device characterized in that the rotational drive means controls the rotation of the drum based on position detection information from the position detection device.

2. The strip member supply device according to claim 1, characterized in that the position detection device comprises a support, a movable arm rotatably supported by the support, a tracking unit provided at the tip of the movable arm that passes the strip member through and follows changes in the position of the strip member, and a sensor means for detecting the position of the tracking unit.

3. The strip-shaped member supply device according to claim 2, characterized in that the sensor means is provided in the tracking portion and comprises a distance sensor that measures the distance between the tracking portion and the outer circumference of the polymer.

4. The strip-shaped member supply device according to claim 2, characterized in that the sensor means is provided in the tracking unit and comprises a distance sensor that measures the distance between the tracking unit and the ground.

5. The position detection device further includes a biasing means for biasing the movable arm, The strip member supply device according to claim 2, wherein the following section has a horizontal roller having a rotation axis parallel to the rotation axis of the drum, and the following section follows the change in position of the strip member by the horizontal roller contacting the strip member under the biasing force of the biasing means.

6. The strip-shaped member is fed out from below the polymer, passes on the opposite side of the manhole from the polymer, and then passes above the polymer before entering the manhole, the movable arm is rotatable in the vertical direction, the weight of the movable arm is provided as the biasing means, and the horizontal roller of the tracking unit contacts the upper surface of the strip-shaped member below the polymer, as described in claim 5.

7. The tracking unit is positioned in the center of the rotation axis direction of the drum, The strip member supply device according to claim 6, further comprising: a tracking unit having a rotation axis parallel to the rotation axis of the drum; another horizontal roller facing the horizontal roller in the thickness direction of the strip member; and a pair of vertical rollers positioned in front of and / or behind the direction of passage of the strip member as seen from these horizontal rollers, and facing the width direction of the strip member.

8. The strip member supply device according to claim 2, characterized in that the following portion restricts the relative displacement of the strip member in the thickness direction and width direction with respect to the strip member.

9. The strip-shaped member supply device according to claim 2, wherein the position detection device further has a buffer member disposed on the polymer side of the tracking portion, and at least the polymer side portion of the buffer member is made of a resin material.

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