JPH07322439A - Stringing apparatus - Google Patents

Abstract

PURPOSE:To provide a stringing apparatus for carrying a cable like object in a wide range from a small diameter to a large diameter by a simple operation. CONSTITUTION:A pair of elastic rollers 3 is supported on a base box 2 in a freely rotatable manner with the rotating shafts placed parallel to each other and they are rotated by a drive mechanism to pass a cable C between them and feed it. A roller distance varying mechanism is provided to move the rollers 3 in such a manner that the distance between the shafts of a pair of the elastic rollers 3 will change.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a power line, an optical cable,
The present invention relates to a wire-drawing device used when conveying linear objects such as nominal wires, rods, ropes, conduits, and gas pipes. The present invention, when laying a variety of communication signal cables in a conduit buried underground, is suitable for transporting the signal cables by continuously pulling in and feeding them out. explain.

[0002]

2. Description of the Related Art Conventionally, when laying a signal cable,
A method of sending out a signal cable from a cable drum and pulling it by a winch or the like on the opposite side is adopted. In this case, if the signal cable becomes long, the traction force becomes larger than the allowable tension of the cable and it becomes impossible to lay it.Therefore, install a wire drawing device in the middle of the cable laying line,
It is designed to give a carrying force to the cable.

As a wire drawing device for applying a carrying force to a cable of this type, there is a wire drawing device described in, for example, Japanese Utility Model Laid-Open No. 6-13311. This is configured such that a cable is sandwiched between a pair of spherical rubber rollers whose air pressure can be adjusted, and the cables are conveyed by rotationally driving the rollers in opposite directions.

[0004]

By the way, there are various sizes (diameters) of cables conveyed by the wire drawing device. In order to enable the feeding of such cables of various sizes, in the above-mentioned conventional device, a spherical (ball-shaped) roller whose air pressure can be adjusted is adopted as the rubber roller, and the air pressure is adjusted according to the size of the cable. ing.

However, there is a limit in the method of dealing with the cable size by adjusting the air pressure. Further, when this wire drawing device is also used for sending out electric power cables, electric conduits, etc., it is difficult to deal with the above-mentioned method because the size of the sent-out linear body becomes wider. There is also a problem in that the work of adjusting the air pressure is troublesome and time-consuming. Furthermore, the driving roller is limited to the one capable of adjusting the air pressure, and the structure of the roller is restricted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wire drawing apparatus capable of handling a wide range of linear objects from a small diameter to a large diameter with a simple operation.

[0007]

According to a first aspect of the present invention, there is provided a pair of elastic rollers rotatably supported by a base member with their axes of rotation parallel to each other, and a roller drive mechanism for rotationally driving the elastic rollers. In a wire drawing device in which a linear body such as a cable is sandwiched between the pair of elastic rollers and the linear body is conveyed by rotationally driving the roller, the axial distance between the pair of elastic rollers changes. In order to ensure that at least one roller is moved, an inter-roller distance varying mechanism is provided.

According to a second aspect of the present invention, in the first aspect, the inter-roller distance varying mechanism supports the rotary shafts of the rollers and the drive motor, and is movable on the base member in the inter-axial distance varying direction. It is characterized in that it is provided with a pair of supported support blocks and a support block moving mechanism for moving the respective support blocks in the variable axial distance direction and in the opposite directions.

According to a third aspect of the present invention, in the second aspect, the support block moving mechanism is fixed to the one support block and a movable rod body having a driven male screw on the outer peripheral surface, and the other support block. A movable cylindrical body having an inner peripheral surface driven female screw, and a movable cylindrical body inserted between the movable cylindrical body and the movable rod body on the outer peripheral surface and the inner peripheral surface of the movable cylindrical body, a driven female of the rod body, and a male screw. A drive cylinder having a matching drive male and female screw and a drive motor for rotationally driving the drive cylinder are provided, and the drive female screw, the driven male screw, the drive male screw, and the driven female screw are mutually reverse screws. It is characterized by that.

According to a fourth aspect of the present invention, in the third aspect, the drive cylinder is a drive male screwed to the driven female screw and the male screw.
It has a double cylinder shape having an inner cylinder part having a female screw and an outer cylinder part for supporting the movable cylinder body so as to be movable in the axial direction,
It is characterized in that the outer cylindrical portion is supported so as to be rotatable and axially immovable with respect to the base member.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the roller drive mechanism and the drive motor for the inter-roller variable mechanism are DC motors, and the AC power supply is switched to the DC power supply. It is characterized by having a circuit.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a roller rotation control device that variably controls a rotation direction and a rotation speed of the roller by the roller drive mechanism, and a roller by the inter-roller variable mechanism. And a roller distance control device for controlling the distance.

According to the invention of claim 7, in claim 6,
A switch circuit in which the roller rotation control device constitutes bridge inverters of the first to fourth switch elements, and the output terminal thereof is connected to the drive motor for the roller drive mechanism, and a switch which is a diagonal combination of the switch circuits. a roller rotation speed control circuit for variably controlling the terminal average voltage of the drive motor by controlling the on-off element in 3KH _Z ~30KH _Z, the motor rotational direction by changing the combination of the switch to be the diagonal A roller rotation direction control circuit for switching and a braking control circuit for braking the drive motor by simultaneously turning on two switch elements on one or the other side of the switch circuit are provided.

According to an eighth aspect of the present invention, in the sixth or seventh aspect, the roller rotation control circuit and the inter-roller distance control circuit are configured to be remotely operable.

[0015]

According to the wire drawing device of the present invention, since the inter-roller distance varying mechanism for moving at least one of the rollers so that the inter-axial distance of the pair of elastic rollers is changed is provided, the linear wire to be conveyed. The distance between the rollers can be made to correspond to the diameter of the body, so that it is possible to accommodate a wide range of conveyance of linear bodies from a small diameter to a large diameter. Further, since it is only necessary to move the roller position manually or automatically, the work is simpler than that in the case of adjusting the air pressure described above, and the structure of the roller is not restricted.

According to the second to fourth aspects of the invention, there is provided a specific structure capable of easily adjusting the distance between the pair of rollers to a distance corresponding to the diameter of the linear body. According to the second aspect of the invention, the support block moving mechanism moves the pair of support blocks supporting the rotary shaft of the roller and the drive motor in mutually opposite directions.

According to the third aspect of the invention, when the drive motor rotationally drives the drive cylinder, the movable rod body screwed into the inner peripheral surface of the drive cylinder moves one of the support blocks, and the drive cylinder body is moved. A movable cylindrical body screwed onto the outer peripheral surface of the pair moves the other support block in the opposite direction to the one support block, whereby the distance between the pair of elastic rollers depends on the diameter of the linear body to be fed. Will be things. In this case, the movable rod,
Since the drive cylinder and the movable cylinder are arranged so as to be coaxial and overlap each other, the axial length may be short,
The device is being downsized.

Further, in the invention of claim 4, the inner tubular portion of the drive tubular body is screwed into the movable rod body and the movable tubular body, and the outer tubular portion of the drive tubular body forms an outer peripheral surface of the movable tubular body. Since it is supported, it is possible to support the movable rod body and the movable cylinder body in a precisely positioned state.

According to the invention of claim 5, since the roller drive mechanism and the inter-roller variable mechanism drive motor are DC motors, it is possible to cope with a large torque fluctuation in the cable laying work. That is, in the above cable sending work,
A large torque is required at the start of feeding the cable, but the required torque is thereafter small. On the other hand, the DC motor can generate a torque about three times the rated torque in a short time. Since a DC motor is used in the present invention, the torque fluctuation can be dealt with by a small motor having a relatively small rated torque.

Further, in the invention of claim 6, the roller rotation direction, the rotation speed, and the roller interval can be appropriately controlled, and in the invention of claim 7, an apparatus for controlling the roller rotation direction and the rotation speed can be realized. According to the invention of claim 8,
Especially in a work environment where the worker cannot easily approach the device placement position, such as laying work in a manhole,
It is possible to realize the work of extending various cables.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 9 are views for explaining a wire drawing device according to an embodiment of the present invention. FIGS. 1, 2 and 3 are front views, side views and plan views, respectively, and FIG. 4 is a distance between rollers. FIG. 5 is a plan view of the variable mechanism, FIG. 5 is a cross-sectional plan view of the support block moving mechanism, FIG. 6 is a cross-sectional side view of the roller driving mechanism, and FIGS.
Is a circuit diagram of the roller rotation control circuit, a control block diagram, and FIG.
Is a waveform diagram.

In these figures, reference numeral 1 is a wire drawing device, which mainly comprises a base box 2, a pair of drive rollers 3 and 3 which are erected on the base box 2, and slides in the base box 2. Support blocks 4 and 4 that are accommodated and arranged so as to support each of the drive rollers 3, and both support blocks 4 and 4 that are accommodated and fixed in the base box 2 so that the axial distance of the drive rollers 3 changes. Support block moving mechanism 5 for moving in the sliding direction
And a pair of guide roller units 6 and 6 arranged on the upper surface of the base box 2.

The base box 2 is a box body having a substantially square shape in a plan view, which is composed of a top plate 2a, a bottom plate 2b, and side plates 2c surrounding the top plate 2a, and the top plate 2a is removable.

Each of the guide roller units 6 is a cable C which is introduced into and sent out from the drive rollers 3 and 3.
And a guide roller 8 that is rotatably provided at the left and right ends of the roller 7 so as to be vertically supported. The roller 7 is rotatably supported by a bracket 9, and the bracket 9 is inserted into a vertically extending elongated hole 9a into which a fixing bolt 9b is inserted, and a supporting plate 10 fixed on the top plate 2a of the base box 2 is supported. It is fixed, so that the position of the roller 7 in the height direction can be adjusted.
The lower end of the guide roller 8 is fixed to the support plate 10.

The drive roller 3 includes a rubber ball 11 and
Ball shaft 1 inserted through the center of the rubber ball 11
2 and. The rubber ball 11 is made of thick-walled rubber and has a substantially spherical shape. Flange portions 11a and 11b are formed at the lower end portion and the upper end portion in the drawing, and the central portion a in the height direction is formed in a cylindrical shape. The flange portion 11a at the lower end is fixed to a flange 12a formed at the lower end of the ball shaft 12 by a stud bolt 13a and a nut 13b. The stud bolt 13a is planted and fixed to the flange portion 11a at the lower end of the rubber ball 11.

A seal cover 31 is fixedly supported on the lower end of the rubber ball 11. This seal cover 3
Reference numeral 1 is a substantially ring-shaped member that surrounds the space between the lower end of the rubber ball 11 and the top plate 2a of the base box 2. The upper flange 31a is fastened together with the flange 12a of the ball shaft 12, and the lower end. The sealing piece 31b of is close to the top plate 2a.

Furthermore, the flange portion 11b at the upper end of the rubber ball 11 is fixed to the upper end portion 12b of the ball shaft 12 by a fixed lid 14 and a fixed bolt 15a. Further, an air supply air valve 16 is disposed in the fixed lid 14 portion, and the valve 16 supplies air into the rubber ball 11 through the air hole 12c or supplies air inside the rubber ball 11 to the air. The air pressure is discharged to the outside to adjust the air pressure.

The support block 4 has a substantially cubic shape and is accommodated in the base box 2 so as to be movable in the direction of arrow A. The support block 4 includes a gear case 18 having a roller deceleration mechanism 17 which will be described later, a guide case 19 detachably fixed to the upper surface of the gear case 18, and a detachable bolt fixed to the lower portion of the gear case 18. And a bottom case 20 that closes the lower end opening. The guide case 19 is formed by integrally forming a cylindrical boss portion 19b on a guide flange portion 19a having a substantially square shape in plan view.
Reference numeral b denotes a recess 1 formed at the lower end of the ball shaft 12 and protruding upward from the opening of the top plate 2a of the base box 2.
Located within 2d.

Here, a seal piece 2d is formed upright on the periphery of the opening for the boss portion 19b of the top plate 2a. The seal piece 2d has an elliptical shape in a plan view that matches the moving shape of the boss portion 19b, and the seal piece 2d is surrounded by the seal cover 31 on the outside.

Guide members 30 are arranged and fixed on the inner surfaces of the top plate 2a and the bottom plate 2b of the base box 2, respectively. Each of the guide members 30 has a structure in which a guide plate 30a that supports the upper and lower parts of the support block 4 slidably in the direction of the arrow A is fixed to the inner surfaces of the top plate 2a and the bottom plate 2b by a guide rod 30b. .

The roller deceleration mechanism 17 is provided between the first sun gear 22a formed on the upper end of the input shaft 21 pivotally supported by the bottom case 20 and the ring gear 23 arranged and fixed on the inner surface of the gear case 18. 4 first planetary gears 22
b is arranged in a rollable manner to engage with each other, the second sun gear 25a formed on the central axis of the first support arm 22c of the first planetary gear 22b, and the ring gear 23.
And a second deceleration unit 25 in which four second planetary gears 25b are rotatably arranged and meshed with each other.

The lower end of the ball drive shaft 24 is coupled to the central axis of the second support arm 25c of the second planetary gear 25b so as to be able to transmit the rotational force.
The sun gears 25a and 22a and the input shaft 21 are arranged on the same axis. The ball drive shaft 24 is rotatably supported by the guide case 19 via a bearing 19c, and is inserted coaxially into the ball shaft 12. The ball drive shaft 24 is connected to the ball shaft 12 by a key 26 so as to be able to transmit a rotational force, and further fixed to the fixed lid 14 at the upper end of the rubber ball 11 and the upper end portion 12b of the ball shaft 12 with a fixing bolt 15b. ing.

The input shaft 21 arranged in the gear case 18 is connected to an intermediate shaft 27 arranged at a right angle to the input shaft 21 via bevel gears 21a and 27a.
The intermediate shaft 27 is mounted on the gear case 1 via a bearing 28a.
8 and is also connected to the output shaft 29b of the roller drive motor 29 via spur gears 27b and 29a. The roller drive motor 29 is a DC magnet motor and is fixed to the side surface of the guide case 18.

The support block moving mechanism 5 has a screw rod (movable rod body) 32 whose right end portion 32a is screwed and fixed to the right side support block 4 and a left end portion 33a thereof is attached to the left side support block 4. A screw cylinder (movable cylinder) 33 screwed and fixed, a drive cylinder 34 in which an inner cylinder portion 34 a is screwed between the screw rod 32 and the screw cylinder 33, and the drive cylinder 34 is rotated. A speed reducing mechanism 35 for varying the rollers to be driven,
The inter-roller variable drive motor 36 is provided. The drive motor 36 is a DC magnet motor similar to the drive motor 29.

A driven male screw formed on the outer peripheral surface of the rod portion 32b of the screw rod 32, and a cylindrical portion 33b of the screw cylinder 33.
The driven female screw formed on the inner peripheral surface of the screw is engaged with the drive female screw and the drive male screw formed on the inner peripheral surface and the outer peripheral surface of the inner tubular portion 34a of the drive tubular body 34, respectively, and these driven female threads are also driven. The male screw and the driving female screw are opposite to the driven female screw and the driving male screw. As a result, when the drive cylinder 34 is rotationally driven, the screw rod 32 and the screw cylinder 33 move the right and left support blocks 4 and 4 in opposite directions.

The drive and driven male and female screws are formed over the entire length of the screw rod 32, the screw cylinder 33, and the drive cylinder 34, but they may be formed on a part of them as appropriate. For example, a drive male and a female screw are formed over the entire length of the drive cylinder 34, and a driven male and a female screw are formed only on a part of the screw rod 32 and the screw cylinder 33 near the tip end thereof, or conversely. 32, a driven male thread and a female thread are formed over the entire length of the screw cylinder 33, and a driving female thread is formed only on a part of the driving cylinder 34 near the flange 34c and a driving male thread is formed only on a part near the tip thereof. Is also good.

The drive cylinder 34 is composed of the inner cylinder portion 34.
The outer cylinder portion 34b is arranged on the outside of a so as to be coaxial,
The right end portions of the inner and outer cylindrical portions 34a and 34b in the figure are provided with a flange 34
It is a double cylinder integrally connected and fixed by c. The outer cylinder portion 34b is supported by a gear box 38 via a pair of left and right bearings 37a so as to be rotatable and immovable in the axial direction.
The gear box 38 is immovably fixed to the inner surface of the base box 2.

The inter-roller variable speed reduction mechanism 35 includes a first sun gear 39a mounted on the output shaft 36a of the inter-roller variable drive motor 36, and a ring gear 40 arranged and fixed on the inner surface of the gear box 38. Between the first three
A first stage reduction gear 39 in which a planetary gear 39b is rotatably arranged and meshed, and a second sun gear 41a mounted on the central axis of a first support arm 39c supporting the first planetary gear 39b.
Between the ring gear 40 and the second planetary gear 41
and a second stage speed reducing portion 41 in which b is rollably arranged and meshed.

A second support arm 41c for supporting the second planetary gear 41b is pivotally supported by the gear box 38 via a bearing 37b, and is keyed to a rotation center shaft 41d of the second support arm 41c. Bevel gear 42 is bearing 3
The bevel gear 34d is pivotally supported by the gear box 38 via 7d and is fixed to the bevel gear 34d fixed to the outer tubular portion 34b of the drive tubular body 34.

Next, the drive circuit and speed control circuit of the drive motor 29 for the drive roller 3 of this embodiment will be described. In FIG. 7, which shows the drive circuit 50 of the drive motor 29, 51 and 52 are AC and DC input terminals, and 5 respectively.
3 is an AC / DC conversion circuit composed of a diode bridge for converting an alternating current into a direct current, 29 is a DC magnet motor for rotationally driving the drive roller 3 as described above,
S1 to S4 are switches composed of FETs or bipolar transistors for controlling the terminal voltage of the motor 29, and are switch circuits having a bridge inverter configuration.

Of the switches S1 to S4, a switch S1, S4 or S which is a diagonal combination of the switch circuits.
2 and S3 are on / off controlled. For example, the switches S1 and S4 are controlled to be opened / closed during normal rotation, and the switches S2 and S3 are controlled to be opened / closed during reverse rotation, thereby controlling the rotation direction. Further, when the motor is braked, the switches S2 and S located on one or the other side of the switch circuit are opposite to each other.
4 or S1 and S3 are turned on at the same time, whereby the DC motor is braked. Incidentally, 54 is a capacitor for smoothing pulsating flow, and 55 is a fuse, which is basically unnecessary, but it is provided in consideration of an emergency failure such as overload or electric leakage.

Although not shown, a battery of, for example, 100 V for supplying a DC power supply to the DC input terminal is provided. By providing this battery, it is possible to operate in a place without an AC power supply.

Further, in FIG. 8 which is a block diagram of the speed control circuit 60 of the drive motor 29 for performing the rotation direction, speed control and braking control by ON / OFF controlling the switch circuit, 61 is a remote control switch. The speed command circuit outputs a speed control voltage Vs according to a speed command signal input via the speed command voltage. The speed control voltage Vs is controlled to a lower voltage as the command speed becomes faster. 62 is 2 for example
Triangular wave voltage V that changes in a constant cycle T between -10 volts
r is a triangular wave generation circuit, 63 is a voltage comparison circuit which outputs a comparison voltage Vc between the triangular wave voltage Vr and the speed control voltage Vs, and the comparison voltage Vc is the triangular wave voltage Vr.
Becomes high for a period t larger than the speed control voltage Vs, and the average voltage of t / T is supplied to the motor 29.

Further, reference numeral 64 is a gate circuit for supplying the comparison voltage Vc to any of the amplifier circuits C1 to C4 for the switches S1 to S4, and the amplifier circuit C1 when the positive rotation signal a is input. When the reverse rotation signal b is input to C4, the comparison voltage Vc is supplied to the amplifier circuits C2 and C3, respectively.

Although not shown, a motor drive circuit for rotating the inter-roller variable drive motor 36 in the forward and reverse directions is provided, and the motor 36 sends a rotation direction instruction signal via a remote control switch. While is input, it rotates forward or backward.

Next, the function and effect of the apparatus of this embodiment will be described. In the wire drawing apparatus 1 of the present embodiment, the cable C is rotatably driven by the motors 29, 29 while the cable C is sandwiched between the pair of left and right drive rollers 3, 3. C is pulled in or sent out in the direction of arrow B in the figure.

In this case, when the rotation direction and the feed speed of the drive roller 3 are instructed by a remote operation switch (not shown), the speed command circuit 61 outputs a lower speed control voltage Vs as the command speed is higher, and the voltage comparison is performed. The high period t of the comparison voltage Vc from the circuit 63 becomes longer and the average voltage to the drive motor 29 becomes higher. Further, at this time, when the rotation direction is instructed to be the normal rotation, the gate circuit 64 receives the comparison voltage Vc by the input of the normal rotation signal a and the amplification circuit for forward rotation C1,
C2, which causes the motor 29 to rotate forward at a higher speed. When the stop mode is instructed, neither the normal rotation signal a nor the reverse rotation signal b is input, and the gate circuit 64 simultaneously turns on the switches S2 and S4 to control the braking operation.

The rotation of the drive motor 29 is reduced at a predetermined ratio by the roller reduction mechanism 17 so that the ball drive shaft 2
4, the drive roller 3 rotates at a speed according to the command speed, and conveys the cable C.

When the cable C is changed to, for example, a cable having a large diameter, and the instruction for expanding the roller interval is given by the remote control switch, the drive motor 36 is operated.
Is rotated, and the rotation of the motor causes the reduction mechanism 35 for varying the distance between rollers.
After being decelerated at a predetermined ratio, the power is transmitted to the movable cylindrical body 34. The rotation of the movable cylinder 34 causes the screw rod 32 and the screw cylinder 33 to rotate and move outward, thereby moving the right and left support blocks 4 and 4 in directions away from each other.
As a result, the distance between the drive rollers 3 and 3 is increased, and the distance is adapted to the conveyance of a large-diameter cable. When an instruction to reduce the roller interval is given, the drive motor 36 rotates in the opposite direction to the above, the interval between the drive rollers 3 and 3 becomes narrower, and an interval corresponding to the conveyance of a cable having a small diameter is obtained.

Here, in the device 1 of this embodiment, the rubber ball 1
Let L be the interval at which one is in contact without being deformed,
From here, it is possible to move by L1 in the direction of approaching each other and by L2 in the direction of moving away from each other.

As described above, according to the wire drawing apparatus 1 of the present embodiment, the distance between the shafts of the pair of drive rollers 3 and 3 can be changed, so that the distance between the rollers corresponding to the diameter of the cable C to be conveyed can be changed. Therefore, the cable C can be transported in a wide range from a small diameter to a large diameter. In adjusting the roller distance, it is only necessary to perform a variable operation of the roller distance by the remote control switch, and therefore, even when the wire drawing apparatus 1 is installed in an underground manhole where an operator cannot easily approach it. Roller spacing can be adjusted. Further, in the apparatus of this embodiment, the drive roller 3 is constituted by the rubber ball 11 whose air pressure can be adjusted, and therefore the air pressure adjustment can also cope with the change in the cable diameter.

Further, in this embodiment, the structure in which the screw rod 32 and the screw cylinder 33 are inserted into the drive cylinder 34 is adopted as the structure for varying the roller interval, so that a large movable distance can be secured. The width (size in the moving direction) of the support block moving mechanism 5 can be set narrow, and the overall size of the device can be reduced.

Furthermore, in the present embodiment, the drive cylinder 34
Is a double cylinder including an inner cylinder portion 34a and an outer cylinder portion 34b, and the outer cylinder portion 34b is rotatably supported by a bearing 37a. Therefore, for example, the driving cylinder body has a structure including only the inner cylinder portion, The width of the support block moving mechanism 5 can be reduced as compared with the case where the extended portion of the tubular portion is pivotally supported.
In addition, a pair of bearings 37 arranged at both ends of the outer cylindrical portion 34b.
Since it is supported by a and 37b, the drive cylinder 34 can be accurately aligned with the axis of the screw rod 32 and the screw cylinder 33, and the operation can be smoothly performed.

Further, in the present embodiment, as the moving structure of the support block 4, the support block 4 is a rectangular cube having a substantially cubic shape, and the upper and lower surfaces thereof are the guide plate 30a and the guide rod 3.
Since it is guided by 0b, it is possible to accurately match the moving direction with the axis lines of the screw rod 32 and the screw cylinder 33, and the support block 4 can be moved smoothly.

Further, in this embodiment, an elliptical seal piece 2d is erected in the opening for the guide boss portion 19b of the top plate 2a, and the outside of the seal piece is surrounded by a seal cover 31 and the seal piece 31b is attached to the top plate 2a. Because it was close to
It is possible to prevent rainwater and the like from entering the base box 2, particularly the support block 4.

Further, in this embodiment, the roller deceleration mechanism 17 and the drive motor 29 are fixed to each support block 4, and they are moved in the roller gap variable direction, and the rotation direction and rotation of the drive motor 29 are also changed. Since the motor drive circuit 50 and the speed control circuit 60 for controlling the speed are provided, it is possible to easily change the rotation direction and the rotation speed of the drive roller 3 while varying the axial distance of the drive roller 3.

Further, in this embodiment, since the DC magnet motor is adopted as the drive motor 29 for the drive roller 3 and the drive motor 36 for varying the inter-roller, it is possible to cope with the torque fluctuation when the cable is conveyed without increasing the size of the motor. It is possible. That is, in the above cable feeding work, a large torque is required at the start of feeding the cable, but after that, the required torque becomes smaller, while the DC motor has a characteristic torque of 3 times the rated torque for a short time.
Double the torque can be generated. In this embodiment, since the DC motor is adopted as described above, the wire drawing work can be performed by the small motor having a relatively small rated torque.

In the above embodiment, as the structure of the support block moving mechanism, the structure in which the screw rod 32 and the screw cylinder 33 are screwed so as to overlap with each other is adopted in the double cylindrical drive cylinder 34. The support block moving mechanism is shown in FIGS.
1, various structures as shown in FIG. 12 can be adopted.

The support block moving mechanism 70 of FIG. 10 has a left screw 71a and a right screw 71 on both the left and right sides of the drive screw rod 71.
b, and nut members 72a, 72 threadedly engaged therewith
b is connected to the left and right support blocks 4 and 4, and the drive screw rod 71 is connected to the worm gear 73a and the worm 73.
This is an example configured to be driven by a support block moving motor via b. In this example, by rotating the drive screw rod 71, the nut members 72a and 72b move in the axial direction, and the inter-axis distance of the drive roller becomes variable.

The support block moving mechanism 80 of FIG. 11 is provided with a left screw left worm 81a on the left side of the drive screw rod 81 and a right screw right worm 81b on the right side, and swings the left and right worms 81a, 81b. The left arm 82a and the right arm 82b, which are movably arranged and have a worm gear on the outer periphery, are engaged with each other, and the driving rollers 83a and 83b are attached to the left and right arms.
Put on. A drive motor 84 common to the drive rollers 83a and 83b is disposed between the arms 82a and 82b, and the drive motor 84 causes the drive rollers 83a and 83a to move in opposite directions via gear trains 85a and 85b. Is configured to drive.

In the example of FIG. 11, by rotating the driving screw rod 81, the left and right arms 82a and 82b swing,
As a result, the axial distance between the drive rollers 83a and 83b changes. Further, in this example, one motor 84
The driving rollers 83a and 83b can be driven, and the cost can be reduced accordingly.

The support block moving mechanism 90 of FIG. 12 is based on a rack and pinion mechanism, and is composed of racks 91a and 9a.
1b is coupled to the support block and the pinion 92
Is configured to be driven by the inter-roller variable drive motor, and in this case as well, the interval between the left and right drive rollers can be adjusted.

In each of the embodiments described above, the rubber ball type driving roller whose air pressure is adjustable is used as the elastic roller. However, the elastic roller of the present invention is not limited to such a structure. It may be a normal cylindrical or rod-shaped roller.

[0064]

According to the wire drawing apparatus of the present invention, since the inter-roller distance varying mechanism for moving at least one of the rollers so as to change the inter-axial distance of the pair of elastic rollers is provided, the wire to be conveyed. Since the distance between the rollers can be set according to the diameter of the linear body, it has the effect of being able to carry a wide range of linear bodies from a small diameter to a large diameter, and compared with the conventional air pressure adjustment work. However, the structure of the roller is not restricted.

In the invention of claim 2, the pair of support blocks for supporting the rotary shaft of the roller and the drive motor move in mutually opposite directions, and in the invention of claim 3, the drive motor rotates the drive cylinder. When driven, a movable rod body screwed onto the inner peripheral surface of the drive cylinder moves one support block,
A movable cylinder body screwed onto the outer peripheral surface of the drive cylinder body moves the other support block in the opposite direction to the one support block. This makes it possible to adjust the distance between the pair of elastic rollers to an interval corresponding to the diameter of the linear body that is about to send out, and it is possible to realize the roller distance adjustment.

According to the third aspect of the invention, since the movable rod body, the drive cylinder body, and the movable cylinder body are arranged so as to be coaxial and overlap with each other, the axial length can be short and the apparatus can be made compact. It has the effect of becoming mangled.

Furthermore, in the invention of claim 4, the drive cylinder is integrally formed with an inner cylinder portion screwed to the movable rod body and the movable cylinder body, and an outer cylinder portion supporting the outer peripheral surface of the movable cylinder body. Since the outer cylindrical portion is axially supported by the double cylindrical body, the axis of the driving cylindrical body can be accurately aligned with the movable rod body and the movable cylindrical body, and smooth operation can be achieved. There is an effect that can improve.

According to the fifth aspect of the invention, since the roller drive mechanism and the inter-roller variable mechanism drive motor are DC motors, a large torque fluctuation occurs at the start of conveyance in the cable conveyance work and at the time of conveyance thereafter. ,
It is possible to use a small motor with a relatively small rated torque.

Further, in the invention of claim 6, since the control circuit of the roller rotation direction and the rotation speed is provided, it is easy to control them. In the invention of claim 7, the control of the rotation direction, the rotation speed and the like is performed. There is an effect that a concrete circuit to be performed can be realized. Furthermore, in the invention of claim 8, since the direction of rotation and the rotation speed are instructed by the remote operation switch, work such as laying work especially in the manhole is performed. Even in a work environment in which a person cannot easily approach the device arrangement position, there is an effect that it is possible to perform work for extending various cables.

[Brief description of drawings]

FIG. 1 is a front view of a wire drawing device according to an embodiment of the present invention.

FIG. 2 is a side view of the apparatus of the above embodiment.

FIG. 3 is a plan view of the apparatus according to the embodiment.

FIG. 4 is a plan view (cross-sectional view taken along the line IV-IV in FIG. 6) showing the inside of the base box of the apparatus of the above embodiment.

FIG. 5 is a cross-sectional plan view of a support block moving mechanism portion of the apparatus of the above embodiment.

FIG. 6 is a cross-sectional side view of a rubber ball drive mechanism portion of the apparatus of the above embodiment.

FIG. 7 is a drive circuit diagram of a rubber ball of the apparatus of the above-described embodiment.

FIG. 8 is a block diagram of a speed control circuit of the apparatus of the above embodiment.

FIG. 9 is a waveform diagram showing a speed control operation of the apparatus of the above embodiment.

FIG. 10 is a schematic view showing a modified example of the roll interval varying mechanism of the apparatus of the above embodiment.

FIG. 11 is a schematic view showing a modified example of the roll interval varying mechanism of the apparatus of the above-described embodiment.

FIG. 12 is a schematic view showing a modified example of the roll interval varying mechanism of the apparatus of the above embodiment.

[Explanation of symbols]

1 Wire Drawing Device 2 Base Box (Base Member) 3 Drive Roller (Elastic Roller) 4 Support Block 5 Support Block Moving Mechanism 12 Ball Shaft (Rotation Shaft) 29 Drive Motor for Drive Roller 32 Screw Rod (Movable Rod) 33 Screw Tube (Movable cylinder) 34 Drive cylinder 34a Inner cylinder part 34b Outer cylinder part 36 Roller variable drive motor 50 Roller drive circuit 53 AC-DC switching circuit 60 Roller rotation control device (rotation direction, speed, braking control circuit) C Cable (Linear body) S1 to S4 switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Masui 1-5-23 Kamikita, Hirano-ku, Osaka City Toyo Iron Works Co., Ltd. Town No. 1 in Japan Battery Co., Ltd. (72) Inventor Tadashi Yasui No. 1 Inaba Babacho, Nishinosho Nishinosho, Minami-ku, Kyoto City Inside Japan Battery Co., Ltd.

Claims (8)

[Claims] 1. A pair of elastic rollers rotatably supported by a base member with their axes of rotation parallel to each other, and a roller drive mechanism for rotationally driving the elastic rollers. In a wire drawing device that conveys a linear body by sandwiching a linear body and rotationally driving the roller, at least one of the rollers is moved so that the axial distance of the pair of elastic rollers changes. A wire drawing device having a variable axial distance mechanism. 2. The pair of rollers according to claim 1, wherein the inter-roller distance varying mechanism supports a rotating shaft of each of the rollers and a driving motor, and is supported by a base member so as to be movable in the inter-axis distance varying direction. A wire drawing apparatus comprising: a support block; and a support block moving mechanism that moves the respective support blocks in the variable axial distance direction and in opposite directions. 3. The movable block body according to claim 2, wherein the supporting block moving mechanism is fixed to the one supporting block and has a driven male screw on the outer peripheral surface, and the movable rod body is fixed to the other supporting block and driven by the inner peripheral surface. A movable tubular body having an internal thread,
It has an outer peripheral surface and an inner peripheral surface which are inserted between the movable cylindrical body and the movable rod body and have the movable cylindrical body, a driven female of the rod body, a drive male screwed with a male screw, and an internal screw and cannot move in the axial direction. A drive cylinder body axially supported by the drive cylinder body and a roller gap drive motor for rotationally driving the drive cylinder body, and the drive male screw, the driven female screw, the drive female screw, and the driven male screw are reverse screws to each other. A wire drawing device characterized by the above. 4. The inner cylinder part, wherein the drive cylinder has the driven female and the drive male screwed to the male screw, and the female screw, and the outer cylinder supporting the movable cylinder so as to be movable in the axial direction. A wire-drawing device, which has a double-tube shape having a portion, and the outer tube portion is supported so as to be rotatable and axially immovable with respect to the base member. 5. The AC / DC switching circuit for switching the AC power supply to a DC power supply, wherein the roller drive mechanism drive motor and the roller distance varying mechanism drive motor are DC motors. A wire drawing device characterized by being provided. 6. The roller rotation control device according to claim 1, wherein the roller driving mechanism variably controls a rotation direction and a rotation speed of the roller, and the inter-roller distance varying mechanism controls the inter-roller distance. An inter-roller distance control device for controlling the wire drawing device. 7. The switch circuit according to claim 6, wherein the roller rotation control device configures the first to fourth switch elements as a bridge inverter, and the output terminal thereof is connected to the drive motor for the roller drive mechanism, the switching elements of the combination of the diagonal of the switch circuits 3KH _Z ~
A roller rotation speed control circuit for variably controlling the terminal average voltage of the drive motor by controlling the on and off at 30KH _Z, roller rotation direction control for switching the rotating direction of the motor by changing the combination of the switch to be the diagonal A wire drawing apparatus comprising: a circuit; and a braking control circuit that brakes the drive motor by simultaneously turning on two switch elements on one side or the other side of the switch circuit. 8. The wire drawing apparatus according to claim 6, wherein the roller rotation control device and the inter-roller distance control device are configured to be remotely operable.