JP2003224909A - Winding/traction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding/traction apparatus for appropriate corresponding action, when an abnormal braking force acts on a cable which is pulled, using a simple structure. <P>SOLUTION: A braking force measuring means 13 measures the braking force which acts against traction movement of cables 5 and 1 to be pulled. A reverse action means 32, which acts when a measurement value of the braking force measuring means 13 exceeds a reference value to reverse a rotary pulley 11. If a braking phenomenon occurs, when the cables 5 and 1 are hooked by, for example, a hanger 4 for some reason, the rotary pulley 11 is reversed immediately based on the signal from the braking force measuring means 13. So, no cable 5 or 1 which is pulled is stretched as far as a plastic region, or disconnection is avoided, even in the worst case. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a take-up and pulling device for pulling a pulling rope connected to a cable such as an information transmission cable around a rotary pulley.

[0002]

2. Description of the Related Art Conventionally, by pulling a tow rope connected to a cable such as an information transmission cable around a rotary pulley, the cable is arranged at a predetermined position such as in an electric pole or an underground conduit. Winding and towing devices are known. In this type of take-up and pulling device, the hanger device supports cables and tow ropes in a guideable state, and during winding, for example, the slide resistance of the hanger device becomes large, or foreign matter is caught in the hanger device. Then, the braking force acts on the movement of these cables and ropes.

When the above braking force is generated, the voltage to the electric motor driving the rotary pulley is increased to increase the driving torque of the rotary pulley, and when this torque reaches a predetermined value, the electric motor is driven. The motor is being stopped.

[0004]

However, if the control is such that the drive torque of the electric motor is changed momentarily according to the load as described above, torque measurement and voltage correction in accordance therewith must be carried out. Therefore, it is complicated as a control method and is disadvantageous in terms of cost. Moreover,
When utilizing the existing electric motor owned by the customer, there is a problem that it is difficult to adapt the control method as described above.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a take-up and towing device capable of avoiding the problems caused by the torque-dependent method as described above.

[0006]

In order to achieve the above object, the take-up and towing device of the present invention winds a tow rope around a rotary pulley to tow the cable connected to the tow rope to an electric pole or A winding and towing device arranged at a predetermined position in an underground conduit or the like, and provided with a braking force measuring means for measuring a braking force acting on a towing movement of the cable or a towed cable such as a tow rope. It is a gist of the present invention to provide a reversing operation means that operates when the value measured by the braking force measuring means exceeds a reference value to reverse the rotation pulley.

That is, the winding and pulling device of the present invention is provided with a braking force measuring means for measuring the braking force acting on the pulling movement of the towed cable or the like, and the value measured by the braking force measuring means is used as a reference. Reversing operation means is provided which is activated when the value is exceeded to reversely rotate the rotary pulley.

Therefore, when the towed cable or the like catches on the hanger device for some reason, for example, and a braking phenomenon occurs, the braking force is measured by the braking force measuring means. When the measured value exceeds the reference value, the reverse rotation operation means operates to reverse the rotation pulley. That is, when an excessive pulling force acts on the towed cable or the like between the location where the braking force is generated and the rotating pulley, the rotating pulley is immediately reversed in reverse due to the signal from the braking force measuring means, so that the towed cable or the like has a plastic region. It can be extended to the worst and the worst case disconnection can be avoided. In particular, when the above-mentioned cable, like an optical fiber, requires careful attention in terms of mechanical strength, the protective function by reversal as described above is very useful.

The braking force measuring means measures, for example, the degree of tension of the towed cable or the like between the location where the braking force is generated and the rotary pulley. Therefore, since the method of detecting the displacement of the towed cable or the like due to the above tension can be adopted, complicated control such as torque detection and correction of the rotational force of the electric motor as in the prior art is not necessary, which simplifies the structure and reduces the cost. It is advantageous for reduction. If the method of detecting the displacement of the towed cable or the like as described above is used as the braking force measuring means, the degree of the displacement can be monitored moment by moment, so that whether the winding operation is normal or not can be determined. It can be grasped accurately.

In the take-up and pulling device of the present invention, the braking force measuring means moves at least according to the pulling force acting on the pulled cable or the like between the location where the braking force is generated and the rotary pulley. And a movement amount measuring means for electrically measuring the movement amount of the movement detection member, the tensile force is converted into the movement amount of the movement detection member and the movement amount. Is detected as an electrical value, so that when this value exceeds the reference value, it can immediately function as a trigger signal for the reverse operation of the rotary pulley, and a highly reliable reverse operation can be obtained. Further, since the conversion into the movement amount and the electrical measurement thereof can be realized by a method having a simplified structure, stable operation can be obtained.

In the winding / pulling device of the present invention, when the measurement information recording means for recording the measured value by the braking force measuring means on a non-contact type storage medium using an integrated circuit is used, The change state of the braking force during the installation work is recorded in the storage medium. By checking this record after the installation work, the state of the pulling force acting on the cable can be grasped, and the quality of the installation work can be confirmed. To help. At the same time, in providing various data associated with the installation work to the customer, using this type of storage medium as an intermediary means can provide highly accurate data.

Further, in order to achieve the above object, the take-up and towing device of the present invention winds a tow rope around a rotary pulley to tow a cable connected to the tow rope into a utility pole or an underground conduit. And the like, which is disposed at a predetermined position such as a control unit, in which the basic information is input through an information storage medium in which the basic information is recorded in advance, and the basic information and the like through the control unit. The gist is that display means for displaying is displayed and operation setting input means for inputting operation settings based on the basic information displayed on the display means are provided.

That is, control means for inputting the basic information via an information storage medium in which the basic information is recorded in advance, display means for displaying the basic information and the like via the control means, and the display means. And an operation setting input means capable of inputting an operation setting based on the basic information displayed on.

Therefore, the basic information including the location and date and time of the cable, the length of the cable, the characteristics of the location and the like is input to the control means via the information storage medium and displayed on the display means. . The laying operator sees this basic information and determines the pulling speed and pulling length of the pulled cable such as the cable and pulling rope, the upper limit value of the braking force that acts on the pulling movement of the pulled cable, and the like. Is input by the operation setting input means.

Therefore, various conditions such as the towing speed that match the characteristics of the installation work site can be reliably set, which is effective in optimizing the quality of the installation work.

In the take-up and pulling device of the present invention, the information storage medium has a pulling distance measured by the distance measuring means of the wind-up and pulling device, and the cable, pull rope, etc. measured by the braking force measuring means. If at least one of the braking force for the towing movement of the tow cable or the like is recorded, the above-mentioned towing distance, braking force, etc., which are important items in the disposition work, are recorded in the information storage medium. By checking after the installation work, the state of the pulling force acting on the cable can be grasped, which is useful for confirming the quality of the installation work and the used length of the cable. At the same time, it is possible to provide highly accurate data when providing the customer with various data associated with the installation work.

In order to achieve the above-mentioned object, the take-up and towing device of the present invention winds a tow rope around a rotary pulley to tow the cable connected to the tow rope into a utility pole or an underground conduit. And a braking force measuring means for measuring a braking force or the like acting on a cable or a towed cable such as a tow rope during a winding tow operation. Control means for inputting / outputting data to / from an information storage medium capable of recording data such as braking force; operation setting input means for setting and inputting a reference value of braking force to the control means; The gist of the present invention is to provide display means capable of displaying data such as the reference value and the measured value via the control means.

That is, a braking force measuring means for measuring a braking force acting on a towed cable such as a cable or a tow rope during a winding tow operation, and information storage capable of recording data on the measured braking force and the like. Control means for inputting / outputting data to / from a medium, operation setting input means capable of setting and inputting a reference value of braking force to the control means, and the reference value or measured value via the control means. And display means capable of displaying data such as.

Therefore, it is possible to input the reference value by operating the operation setting inputting means while confirming the data such as the measured value of the braking force through the control means on the display means. Therefore, it is possible to reliably perform the setting and inputting operation of the reference value, and it is possible to set the reference value while watching the displayed value rather than the setting using the dial scale, and the setting accuracy is improved.

Further, the changing state of the braking force during the cable arranging work is recorded in the information storage medium and displayed in real time by the display means. Therefore, by checking the above-mentioned record after the installation work, the state of the pulling force acting on the cable can be grasped, and the fluctuation of the braking force can be predicted by the data displayed in real time to interrupt the work. It is also possible to prevent accidents in advance, which is useful for checking the quality of installation work. At the same time, in providing various data associated with the installation work to the customer, it is possible to provide highly accurate data by using this type of information storage medium as an intermediary means.

In the winding and towing device of the present invention, when the information storage medium is a non-contact type storage medium using an integrated circuit, necessary basic information stored in indoor work is stored in the form of the storage medium. With this, it is possible to input to the control means at the installation site, and it is possible to prevent mistakes when inputting information and to carry it conveniently.
At the same time, on the contrary, the data such as the braking force can be stored in the storage medium at the installation site, and the data from the storage medium can be examined for indoor work.

In the winding and towing device of the present invention, when the control means, the display means and the operation setting input means are arranged in a control box, the display and operation setting via the control means are performed. Since the operation and the operation are integrated in the control box, good display visibility and easy operation can be realized at one place. At the same time, the control box can be compactly integrated.

In the winding / pulling device of the present invention, when the control box is provided with an insertion opening for inserting the storage medium, the insertion opening is also integrated in the control box, which is suitable as a compact unit. Is. Also,
For example, since the basic information stored in the IC card or the like is put into the control box, information can be accurately input to the control means or the like in the box.

In the winding / pulling device of the present invention, the control box, the driving means for rotating the rotary pulley, and the braking force measuring means are mounted on the base member with a predetermined gap. In the above control box,
Installation integrity of the driving means, braking force measuring means, etc. is ensured. Furthermore, when the customer already uses the driving means, the winding and towing device can be easily knitted by securing a mounting space for the driving means in advance.

In the winding / pulling device of the present invention, the measuring portion of the distance measuring means attached to the control box, the rotating pulley and the measuring portion of the braking force measuring means are arranged on substantially one virtual plane. In this case, since the towed cable and the like can be arranged as straight as possible, the towed cable and the like can be towed without exerting an unreasonable force.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail.

1 to 5 show an embodiment of the winding and pulling device of the present invention. FIG. 5 shows a typical example in which the cable 1 such as an optical fiber or a thin electric wire is arranged. This is a case where the cable 1 is installed on the utility pole 2. A large number of hangers 4 are attached to the support rope 3 which is tightly stretched in advance, and the cables 1 are passed through the hangers 4 to perform the above-mentioned installation. For this purpose, a tow rope 5 that fulfills the lead function is passed through the hanger 4, one end of which is connected to the cable 1 via a joint 6 and the other end of which is connected to the winding and towing device 7. The cable 1 here is an optical fiber, which is wound around the drum 8.

The winding / pulling device 7 of the present invention comprises, for example, a control box 10 and a control box 10 on a base member 9 made of thick steel plate.
The DC electric motor 12 for rotating the rotary pulley 11 and the braking force measuring means 13 are fixed at a predetermined interval. The rotating pulley 11 has a minimum diameter at its center when viewed in the rotation axis direction, and has a larger diameter as it moves away from the center portion in the rotation axis direction, forming a so-called hourglass shape.

As shown in FIG. 2, the tow rope 5
To the rotary pulley 11 via the braking force measuring means 13.
It is passed through the distance measuring means 14 after being wound three times. Reference numeral 15 is a winding drum for the tow rope 5. As is clear from FIG. 2, the braking force measuring means 1
3, the rotary pulley 11, the distance measuring means 14 and the like are arranged on an imaginary plane perpendicular to the paper surface of FIG. 2 so that the tow rope 5 can be smoothly wound and moved. In this way, the tow rope 5 can be arranged as straight as possible, so that the tow rope 5 can be towed without exerting an excessive force.

When the tow rope 5 or the optical fiber 1 is caught on the hanger 4 for some reason during towing, a so-called braking force is generated at that portion. Due to such a braking phenomenon, the optical fiber 1 and the tow rope 5 between the location where the braking force is generated and the rotary pulley 11 are in a tense state. If the degree of this tension is abnormally high, the optical fiber 1 and the tow rope 5 (both of which are collectively referred to as "towed cables, etc.") are disturbed, and in the worst case, the optical fiber 1 is broken. There is a fear.

A braking force measuring means 13 is provided to prepare for the above-mentioned abnormal situation. Although various methods can be adopted as the method for realizing the braking force measuring means 13, here, movement detection that moves according to a displacement amount due to tension of the towed cable or the like, that is, a pulling force acting on the towed cable or the like is detected. It comprises a member 16 and a movement amount measuring means 17 for electrically measuring the movement amount of the movement detecting member 16. Reference numeral 19 is a guide member such as a towed cable fixed to the stationary member.

FIG. 3 shows the above-mentioned structure in principle, in which the movement detecting member 16 made of a round bar is the return spring 1.
When the movement detecting member 16 moves downward due to the increased tension of the towed cable or the like, the displacement amount is converted into an electric value by the movement amount measuring means 17 for measurement. It The movement amount measuring means 17 can be easily implemented by a normal displacement measuring device.

Since the movement detecting member 16 is vertically displaced, even if the tow rope 5 moves vertically, the position around the rotary pulley 11 does not shift in the axial direction of the pulley and is always constant. Becomes Since the rotary pulley 11 has a drum shape as described above, if the rotary pulley 11
When the tow rope 5 is displaced in the axial direction of, the effective diameter of the rotary pulley 11 with respect to the tow rope 5 increases. Due to such a phenomenon, the rate of change of the load on the DC electric motor 12 becomes large, or the traction speed becomes “uneven”.
May occur. By displacing the movement detecting member 16 in the vertical direction, it is possible to avoid such a problem.

Various methods can be adopted for the distance measuring means 14 provided for measuring the erection length of the optical fiber 1. Here, the moving length of the tow rope 5 is determined by the number of rotations of the rotating body 20. The measurement method is used. The number of rotations is digitized using, for example, an encoder. Reference numeral 21 is a tension roller for preventing the pulling rope 5 from slipping on the rotating body 20.

The distance measuring means 14 is the control box 1
It is attached to the outer side surface of 0, and is also useful for the layout on the 1 virtual plane described in FIG. 2 and the compactification around the control box 10.

The control box 10 is provided with a display means 22 composed of a liquid crystal screen, and the pulling speed of the pulling rope 5, the pulling length, the voltage of the DC electric motor 12 and the like are controlled by a rotary knob as shown. An operation setting input means 23 for setting is provided, and further, an insertion port 24 for inserting an IC card described later is provided. Particularly, in the operation setting input at this time, the limit value of the braking force acting on the towed cable or the like, that is, the reference value for performing the emergency measure operation is input. A control device for performing various functions is stored in the control box 10.

As shown in FIG. 1, the display means 22
Is provided on the upper surface of the control box 10, and the operation setting input means 23 is arranged on the lateral side surface of the control box 10. The operation setting input means 23 is displayed on the upper surface of the control box 10 by changing such arrangement. It may be arranged side by side with the means 22.

Next, the overall control system will be described based on the system diagram shown in FIG.

A storage medium which is a basic information medium, for example, I
In the C card 25, basic information ejected by the computer device 26, that is, information including the construction number, the location and date and time of the optical fiber 1, the installation length, the characteristics of the installation location, etc. is stored in advance. When the IC card 25 is inserted into the insertion slot 24, the basic information input means 27 inputs the basic information to the control means 28 which is the core of the computer. This basic information is immediately displayed on the display means 22.
The operator operates the operation setting input means 23 while watching the basic information to input the above-mentioned pulling speed and the like.
This input value is input from the control means 28 to the drive means 12 to perform a predetermined drive, and the pulling rope 5 is pulled by the rotary pulley 11.

The state of frictional resistance between the towed cable or the like and the hanger 4 generated during the above-described towing, or the state when the towed cable or the like is caught on the hanger 4 and a braking force is generated, It is digitized by the braking force measuring means 13 and input to the control means 28 in real time. Similarly, the length measured by the distance measuring unit 14 is also input to the control unit 28 in real time. The braking force and the measured distance are displayed on the display unit 22 every moment, and are input to the IC card 25 by the measurement information recording unit 29. By carrying out the flow processing of this IC card 25 as shown in FIG. 4B, it is possible to print out the installation work data of the optical fiber 1 and provide the customer with the quality status of the work.
It should be noted that the IC card reader and the printer each have a reference numeral
It is indicated by 0,31.

By adopting a contact type such as the IC card 25 described above, it is possible to perform a reliable information medium function even in an environment where dust and rain are bad outdoors.

When the value measured by the braking force measuring means 13 exceeds a preset reference value, a signal indicating an abnormal situation is input from the control means 28 to the reverse rotation operation means 32. Then, the reversing operation means 32 performs an operation of reversing the polarity of the DC electric motor 12, and the DC electric motor 12 as the driving means starts the reverse rotation. This reverse rotation is stopped at an appropriate reverse rotation number by employing a timer or the like. Incidentally, reference numeral 33 is a data storage means, which fulfills a normal storage function.

As described above, when an excessive pulling force acts on the towed cable or the like between the location where the braking force is generated and the rotating pulley 11, the rotating pulley 11 is immediately reversed by the signal from the braking force measuring means 13. It is possible to prevent the towed cable or the like from being extended to the plastic region or the worst case disconnection. Further, since the pulling force is converted into the movement amount of the movement detecting member 16 and the movement amount is detected as an electric value, the reverse operation of the rotary pulley 11 is immediately performed when the movement amount exceeds the reference value. Can be used as a trigger signal of, and highly reliable reverse operation can be obtained.
Further, since the conversion into the movement amount and the electrical measurement thereof can be realized by a method having a simplified structure, stable operation can be obtained.

Further, since the towed cable and the like are loosened by the reverse rotation of the rotary pulley 11, it is easy to carry out the recovery work of the stuck portion and the like by utilizing the allowance of the loosened portion.

Since the IC card 25 is used as an information storage medium, the input of basic information and the recording of measurement information are surely performed, and accurate information input / output is performed with the control means. Therefore, by printing it out, highly accurate data can be provided to the customer.
Further, when the IC card 25 is utilized, the necessary basic information stored in the indoor work can be input in the form of a card to the control means at the installation site, and it is possible to prevent mistakes when inputting information and to carry it conveniently. On the contrary, the data such as the above braking force can be stored in the card at the installation site and the data from the card can be examined for indoor work.

Since the operator can set an appropriate reference value with the operation setting input means 23 while looking at the basic information displayed on the display means 22 and the braking force measured value at the initial stage of pulling, the situation at the installation site of the optical fiber 1 It is possible to set the reference value etc. according to Further, in order to obtain a reliable reference value of the braking force, so-called trial pulling may be performed to grasp the normal traction resistance value, and then the reference value may be set.

Since the control means 28, the display means 22 and the operation setting input means 23 are arranged in the control box 10, the above display and operation setting operation via the control means 28 are integrated in the control box. Because it is made in a form that has good visibility and easy operation
Realize in place. At the same time, the control box can be compactly integrated.

In the control box 10, the IC card 2
Since the insertion port 24 into which the 5 is inserted is provided, the insertion port 24 is also integrated in the control box 10 and is suitable as a compact unit. Further, since the basic information stored in the IC card 25 is put into the control box 10, the information can be accurately input to the control means 10 in the box.

By adopting the base member 9, the installation integrity of the control box 10, the driving means 12, the braking force measuring means 13 and the like can be ensured. Furthermore, when the customer already uses the driving means 12, the winding and towing device can be easily knitted by securing a mounting space for the driving means 12 in advance.

In the above-mentioned embodiment, the case where the optical fiber is installed on the utility pole is shown. However, even when the optical fiber is installed in the underground conduit, the same configuration and operation are used. can do.

[0051]

As described above, according to the winding / pulling device of the present invention, when a pulling cable or the like catches on a hanger device for some reason and a braking phenomenon occurs, the pulling force measuring means detects the braking phenomenon. The braking force is measured. When the measured value exceeds the reference value, the reverse rotation operation means operates to reverse the rotation pulley. That is, when an excessive pulling force acts on the towed cable or the like between the location where the braking force is generated and the rotating pulley, the rotating pulley is immediately reversed in reverse due to the signal from the braking force measuring means, so that the towed cable or the like has a plastic region. It can be extended to the worst and the worst case disconnection can be avoided. In particular, the protective function by reversal as described above is very useful when the cable has to be carefully treated in terms of mechanical strength like optical fiber.

The braking force measuring means measures, for example, the degree of tension of the towed cable or the like between the location where the braking force is generated and the rotary pulley. Therefore, since the method of detecting the displacement of the towed cable or the like due to the above tension can be adopted, complicated control such as torque detection and correction of the rotational force of the electric motor as in the prior art is not necessary, which simplifies the structure and reduces the cost. It is advantageous for reduction. If the method of detecting the displacement of the towed cable or the like as described above is used as the braking force measuring means, the degree of the displacement can be monitored moment by moment, so that whether the winding operation is normal or not can be determined. It can be grasped accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing a winding and pulling device according to an embodiment of the present invention.

FIG. 2 is a plan view showing an arrangement state of rotary pulleys, movement detection members, and the like.

FIG. 3 is a side view showing in principle a braking force measuring means.

FIG. 4 is an operation system diagram of the winding and pulling device of the present invention.

FIG. 5 is a side view showing a cable installation site.

[Explanation of symbols]

1 cable, optical fiber 2 utility poles 3 support ropes 4 hangers 5 tow rope 6 joint 7 Winding traction device 8 drums 9 base members 10 control box 11 rotating pulley 12 Drive means, DC electric motor 13 Braking force measuring means 14 Distance measuring means 15 winding drum 16 Movement detection member 17 Moving amount measuring means 18 Return spring 19 Guide member 20 rotating body 21 Tension roller 22 Display means 23 Operation setting input means 24 insertion slot 25 IC cards, storage media, information storage media 26 Computer equipment 27 Basic information input means 28 Control means 29 Measurement information recording means 30 IC card reader 31 Printer 32 Reverse rotation means 33 data storage means

Claims (11)

[Claims] 1. A take-up and pulling device for winding a pulling rope around a rotary pulley and pulling the pulling rope to arrange a cable connected to the pulling rope at a predetermined position such as in a utility pole or an underground conduit. Braking force measuring means for measuring the braking force acting on the pulling movement of the towed cable such as the cable or tow rope is provided, and it operates when the measured value by the braking force measuring means exceeds the reference value. A retraction device for reversing the rotary pulley is provided. 2. The movement detecting member, which moves at least in accordance with a pulling force acting on a towed cable or the like between a location where the braking force is generated and a rotary pulley, and a movement detecting member of the movement detecting member. The take-up / pulling device according to claim 1, further comprising a moving amount measuring means for electrically measuring the moving amount. 3. The winding and towing device according to claim 1, further comprising a measurement information recording means for recording the measured value by the braking force measuring means in a non-contact type storage medium using an integrated circuit. 4. A take-up and pulling device for winding a pulling rope around a rotary pulley and pulling the pulling rope to arrange a cable connected to the pulling rope at a predetermined position such as in a utility pole or an underground conduit. Control means for inputting the basic information via an information storage medium in which basic information is recorded in advance,
A winding tow device provided with display means for displaying the basic information and the like via the control means and operation setting input means capable of inputting operation settings based on the basic information displayed on the display means. . 5. The information storage medium includes a towing distance measured by a distance measuring means of a winding and towing device and a towing movement of the cable or a towed cable such as a tow rope measured by a braking force measuring means. 5. The take-up and towing device according to claim 4, wherein at least one of the braking forces to the is recorded. 6. A take-up and towing device for arranging a cable connected to the tow rope at a predetermined position, such as in a utility pole or in an underground conduit, by winding the tow rope around a rotary pulley and towing the tow rope. Between the braking force measuring means for measuring the braking force etc. acting on the towed cable such as the cable or the tow rope during the winding tow operation and the information storage medium capable of recording the data of the measured braking force etc. Control means for inputting / outputting data, operation setting input means for setting and inputting a reference value of braking force to the control means, and display of data such as the reference value and measured value via the control means And a display means that can be used. 7. The winding and pulling device according to claim 4, wherein the information storage medium is a non-contact type storage medium using an integrated circuit. 8. The winding tow device according to claim 4, wherein the control means, the display means, and the operation setting input means are arranged in a control box. 9. The winding / pulling device according to claim 8, wherein the control box is provided with an insertion opening into which the storage medium is inserted. 10. The winding according to claim 8, wherein the control box, the driving means for rotating the rotary pulley, and the braking force measuring means are mounted on the base member with a predetermined gap. Towing device. 11. The winding device according to claim 10, wherein the measuring portion of the distance measuring means attached to the control box, the rotating pulley and the measuring portion of the braking force measuring means are arranged substantially on one virtual plane. Traction device.