JP3219972B2 - Automatic cable feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic cable feeding device, and more particularly to an automatic cable feeding device capable of keeping a slack of a cable during a work of laying on a utility pole or the like within a predetermined range.

[0002]

2. Description of the Related Art When a cable such as a telephone line is laid between utility poles, a cable feeding device for feeding the cable is used. When the cable connected to the leading rope that has been pulled in advance on the towing side is wound around the cable drum of the cable feeding device and pulled toward the towing side, the cable feeding device draws out the cable according to the towing speed. ing. At that time, the worker observes the amount of slack of the cable, and if the amount of slack of the cable that has been drawn out is large, slows down the payout speed of the cable. You're fast.

[0003]

However, in the above-mentioned conventional example, the cable feeding speed cannot be accurately controlled in accordance with the temporal change of the slack amount of the cable, so that the cable fed from the cable feeding device cannot be controlled. In some cases, the slack of the cable becomes too large, and the cable hinders the passage of vehicles and people on the road. On the other hand, the slack of the cable becomes too small, and the cable laying work cannot be performed smoothly. Accordingly, an object of the present invention is to provide an automatic cable feeding device which can eliminate the above-mentioned drawbacks and can keep the slack of the cable during negotiation within an appropriate range.

[0004]

In order to solve the above-mentioned problems, a first aspect of the present invention is directed to an automatic cable feeding device for feeding a traction cable at an optional feeding speed. Slack detecting means for detecting the slack amount of the cable, and when the slack amount detected by the slack detecting means is equal to or more than a predetermined first slack amount, the feeding of the cable is stopped and detected by the slack detecting means. When the slack amount is smaller than the first slack amount and larger than a second slack amount smaller than the first slack amount, the cable feeding speed is set to the first speed, and the cable is detected by the slack detecting means. wherein when slack amount is less than the amount the second slack provided with a cable feeding speed adjusting means for setting the feeding speed of the cable into the first faster than the rate the second speed, the slack Detecting means comprises a pivot member, first Limi
And a second limit switch.
The rotating member is engaged with a slack detection portion of the cable, and
The part other than the engagement part of the rotating member is at a predetermined position.
The cable is rotatably supported, and the position of the
The first limit switch when the first limit
Switch is activated, and the position of the pivoting member is
2nd limit switch operates when corresponding to 2 slack amount
The slack amount detected by the slack detecting means is equal to a second
When it becomes smaller than the slack amount, the second limit
The position of the switch is movable by being pushed by the rotating member
This is an automatic cable feeding device .

According to the first aspect of the present invention, the slack detecting means detects the slack of the fed cable, and determines the magnitude of the detected slack amount based on the predetermined first slack amount and the first slack amount. Compared with the small second slack amount, when the cable slack amount is equal to or more than the first slack amount, the cable feeding speed adjusting means stops the cable feeding, so that the cable slack can be made smaller than the first slack amount. . Further, when the detected slack amount is smaller than the first slack amount and larger than the second slack amount, the cable feeding speed adjusting means sets the cable feeding speed to the first speed, and the detection is made. When the slack amount is equal to or less than the second slack amount, the cable feeding speed adjusting means sets the cable feeding speed to the second feeding speed higher than the first feeding speed.
The amount of slack of the cable can be equal to or more than the first amount of slack and within a range close to the amount of second slack. Furthermore, a slack detecting means
The rotating member is connected to the slack detection site of the unreeled cable.
And a portion other than the engagement portion of the rotating member is predetermined.
The pivoting member is rotatably supported at
Cable according to the change in the amount of slack at the slack detection site.
You. Furthermore, the first limit switch of the slack detecting means is
When the rotating member is at a position corresponding to the first slack amount,
Activates the second limit switch of the slack detection means
When the moving member is at a position corresponding to the second slack amount,
The first limit switch adjusts the first slack amount.
The second limit switch detects the second slack amount
I do. Furthermore, the amount of slack of the cable that has been fed out is the second
Even if the amount of slack becomes smaller than
The cable can rotate in response to a decrease in the amount of slack in the cable.
The rotating member does not apply excessive tension to the
The bull can be prevented from being bent and damaged.

[0006]

[0007]

[0008]

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the whole of the first embodiment, FIG. 2 shows a main part of the first embodiment, and FIG. 3 shows an exploded view of the main part of the embodiment. 1 to 3, a cable drum 10 around which a cable 60 such as a telephone line is wound is fixed to a shaft 11. In addition,
The ring-shaped first stopper 11a and the ring-shaped second stopper 11b are disposed so as to sandwich the cable drum 10 from both sides, thereby preventing the cable drum 10 from laterally shifting. The roller 12 is disposed so as to be urged and abutted on the outer periphery of the flange 10 a of the cable drum 10 by a plate pan 17 b (see FIG. 5) described later to rotate the cable drum 10.

A motor 13 as means for adjusting the feeding speed of the cable 60 is provided so as to rotate the roller 12, and the control device 14 controls the motor 13 by turning on / off a lower limit switch 44 and an upper limit switch 47 which will be described later. Connected to control rotation and stop. The input device 15 is connected so as to give a signal such as start / end of the work to the control device 14. The wiring 16
However, the motor 13, the input device 15, and the limit switches 44 and 47 described below are connected to the control device 14. Note that the roller 12 and the motor 13 are fixed on the movable base 17. As shown in FIG.
7 is fixed on the carriage 17a via a leaf spring 17b. The carriage 17a is provided with a rail 1 attached to the frame 18.
8a so as to be slidable.

The shaft 11 of the cable drum 10 is rotatably supported by first and second bearings 24, 33 of first and second cable jacks 20, 30, which will be described later.
And the second cable jacks 20 and 30 are fixed on the frame 18. The first cable jack 20 has a cable jack body 21, a ratchet handle 22, a cable jack head 23, and a first bearing 24. Since the cable jack body 21 is fixed to the frame 18 and the male screw portion 23a of the cable jack head 23 is screwed into the female screw portion formed in the hole of the cable jack body 21, the ratchet handle 22 reciprocates in the horizontal direction in the figure. By moving the cable jack head 23, the cable jack head 23 can be moved up and down with respect to the cable jack main body 21.

The first bearing 24 comprises a bearing portion 24a and a circular sleeve-like support portion 24b for supporting the bearing portion 24a.
The support portion 24b is rotatably fitted to the cylindrical head 23 of the cable jack 20 via a ring-shaped lower portion 41a of the arm bearing main body 41 described later. The second cable jack 30 is similar to the first cable jack 20, and includes a cable jack body 31, a ratchet handle 3,
2, a head (not shown) and a second bearing 33 are provided.

The slack detecting means 40 of the cable 60 being bridged between utility poles comprises the following components, and is attached to the cable jack 20 and the shaft 11. The arm bearing body 41 has a ring-shaped lower portion 41a rotatably fitted to the cable jack head 23, and a bearing portion 41b having a shaft 1
1 so as to be rotatable. The pin 42 is fixed to the arm bearing main body 41. Lower limit switch fixing plate 4
3 is fixed to the arm bearing main body 41 by a screw (not shown), and a lower limit switch 44 as a first limit switch is fixed to a lower limit switch fixing plate 43 by a screw (not shown). The ring-shaped lower portion 45a of the upper limit switch position adjusting plate 45 is
Is slidably fitted to the bearing portion 41b. The upper limit switch fixing plate 46 is fixed to the upper limit switch position adjusting plate 45 with screws (not shown), and the upper limit switch 47 as the second limit switch is fixed to the upper limit switch fixing plate 46 with screws (not shown).

A pin 48 is fixed to the upper limit switch position adjusting plate 45, and a coil spring 49 is
8 is fixed. For this reason, the upper limit switch position adjusting plate 45 is urged by a spring 49 so that the pin 48 comes into contact with the end of the arm bearing main body 41.
A ring-shaped base portion 50a of the arm fixing portion 50 is rotatably fitted to a bearing portion 41b of the arm bearing main body 41.
The holding member 11c is fixed to the bearing portion 41b, thereby preventing the arm fixing portion 50 and the upper limit switch position adjusting plate 45 from coming off from the bearing portion 41b of the arm bearing main body 41. An arm 51 as a rotating member is fixed to the arm fixing part 50 by a pin 52. A roller slide bar 53 is connected to the distal end 51 a of the arm 51, and a roller hanger 54 is connected to the roller slide bar 5.
3 is slidably mounted. In the roller hanger 54, a large number of circular plate-like members 54a are rotatably attached to the cord-like core 54b in order to facilitate the pulling of the engaged cable as described later. Flanged stoppers 53 attached to both ends of roller sliver 53
a and 53 b prevent the roller hanger 54 from coming off the roller slide bar 53. A cable (not shown) (corresponding to the cable 60 in FIG. 1) passes between the roller slide bar 53 and the roller hanger 54. For this reason, the roller slide bar 53 and the roller hanger 54 engage with the slack detection site of the cable.

FIG. 4 shows a second embodiment. 4, a shaft 70 (corresponding to the shaft 11 in FIG. 2)
Supports a cable drum (not shown), and a first arm 72 as a rotating member is fixed to a first arm fixing portion 71 (corresponding to the arm fixing portion 50 in FIG. 2) by a pin 71a. Cable slack detecting means 73 (corresponding to slack detecting means 40 in FIG. 2) is formed in the same manner as in the first embodiment. A second arm 76 as a rotating member is fixed to a second arm fixing portion 75 (similar to the first arm fixing portion 71) by a pin 75a. Upper pipe 8
The 0 and lower pipes 81 are fixed to the distal ends of the first and second arms 72 and 76 so as to be substantially parallel to each other. A pipe-shaped roller 82 is mounted on the upper pipe 80. A cable (not shown) (corresponding to the cable 60 in FIG. 1) is inserted between the upper pipe 80 and the lower pipe 81. For this reason, the upper and lower pipes 80 and 81 engage with the cable.

The stopper pin 80a is connected to the pipe 8
The stopper pins 80b pass through the other ends of the pipes 80 and 81 to prevent the pipes 80 and 81 from coming off the first and second arms 72 and 76. In addition, a first bearing 83 corresponding to each member shown in FIGS.
A second bearing 84, an arm bearing main body 85, an upper limit switch adjusting plate 86, an upper limit switch 87, a lower limit switch 88, and a holding metal 89 are provided.

FIG. 5 illustrates the operation of the first embodiment. In FIG. 5, a cable 60 is extended from a cable drum 10 and laid on a cable hanger 62 attached to a utility pole 61. Note that the utility poles 61 are arranged on the ground 65 in a row instead of one. The tip of the cable 60 is connected to a rope (not shown), and the rope is pulled by a towing machine (not shown). Cable 60
The slack state of a. A state of a predetermined first slack amount (a state in which the lower limit switch 44 is operated), b. A state of a second slack amount smaller than the first slack amount (a state in which the upper limit switch 47 is operated) and c. The state in which the slack amount is further reduced from the state of the second slack amount and the arm is inclined upward is shown.

In the state a, the lower limit switch 44
Is turned on and is in a standby state at the time of stopping or starting work.
Between the state of a and the state of b, the towing machine pulls the cable, the slack of the cable is reduced, the lower limit switch 44 and the upper limit switch 47 are both off,
The control device 14 rotates the motor 13 at a low speed, and the cable feeding speed is the first speed (see FIG. 6). In the state b, the towing speed is further increased, the slack of the cable is reduced, the upper limit switch 47 is turned on, the controller 14 rotates the motor 13 at a high speed, and the feeding speed of the cable is the second speed (the second speed). 1). c
In the state of, the towing speed is sharply accelerated and the cable 60
The upper limit switch position adjusting plate 45 is attached to the arm 51 against the urging force of the spring 49 in order to prevent excessive tension from being applied to the cable 60 and to prevent the cable 60 from bending and damaging. The position of the upper limit switch 47 is adjusted upward by being pushed and moving upward. At this time, upper limit switch 4
7, the motor 13 is rotating at a high speed. Even when the pulling speed of the cable 60 is reduced, the slack of the cable 60 increases and the arm 51 descends, so that the lower limit switch 44 is turned on, the control device 14 stops the rotation of the motor 13 and the cable 60 Stop feeding.

FIG. 6 illustrates the operation of each embodiment. In FIG. 6, (a) shows the towing speed of the towing machine,
(B) shows a cable feeding speed, (c) shows a slack detection arm operation, and (d) shows a rotation speed of the motor 13. Comparing (a) and (b), the cable payout speed changes following the change in the pulling speed. (C)
When the motor 13 is started, the lower limit switch (lower LS) 44 is turned on at first, and after a while, the lower limit switch 4 is turned on by the rotation of the arm 51.
4 turns off. Further, with the passage of time, the slack of the cable 60 is reduced, the arm 51 is rotated, and the upper limit switch (upper LS) 47 is turned on. Further, as time elapses, the upper limit switch 47 is repeatedly turned on and off, and the angle of the arm 51 fluctuates within a certain range.

When the lower limit switch 44 is on, the motor 13 is stopped. When the lower limit switch 44 is off, and when the upper limit switch 47 is off, the motor 13 rotates at a low speed (cable 60). When the upper limit switch 47 is ON, the motor 13 is at a high speed (corresponding to a payout speed of the cable 60 of 22 m / s).

[0021]

According to a first cable automatic feeding device according to the invention of the present application, according to the present invention, it is possible to slack in the fed-out cable to KaWataru utility poles or the like to that within a predetermined range, the cable The efficiency of the negotiation work and the safety can be improved. In particular, there is no possibility that the slack of the cable during the negotiation work becomes too large and hinders cars and people traveling on the road. Further, since the case where slack of cable is in a predetermined first amount of looseness or first slack amount is less than the second amount of slackness can be accurately detected, easily temporal change in the amount of looseness of the cables of It can be compared with the first or second slack amount. For this reason, control of the slack amount of the cable becomes easy. In further,
Even if the slack in the cable is smaller than a predetermined amount of the second slack, the slack detection means can be prevented that the cable is damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the first embodiment.

FIG. 3 is an exploded perspective view of the one shown in FIG. 2;

FIG. 4 is a perspective view showing a second embodiment.

FIG. 5 is an operation explanatory diagram of each of the embodiments.

FIG. 6 is a graph illustrating an operation of each of the embodiments.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Cable drum 11 Shaft 12 Roller 13 Motor 14 Control device 15 Input device 20 1st cable jack 30 2nd cable jack 40 Looseness detection means 44 Lower limit switch 45 Upper limit switch position adjusting plate 47 Upper limit switch 51 Arm 53 Roller slide Bar 54 Roller hanger 60 Cable 7 2 First arm 73 Looseness detection means 76 Second arm 80 Upper pipe 81 Lower pipe 82 Roller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-278942 (JP, A) JP-A 1-11255 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 1/02

Claims (1)

(57) [Claims] 1. An automatic cable feeding device for feeding a pulled negotiation cable at an arbitrary feeding speed, wherein the slack detecting means detects a slack amount of the fed cable, and the slack detecting means detects the slack amount. The slack amount is a predetermined first.
When the slack amount is equal to or more than the slack amount, the cable feeding is stopped, and when the slack amount detected by the slack detecting means is smaller than the first slack amount and larger than the second slack amount smaller than the first slack amount. The cable feeding speed is set to a first speed, and when the slack amount detected by the slack detecting means is equal to or less than the second slack amount, the cable feeding speed is set to a second speed higher than the first speed. A cable feeding speed adjusting means for setting the slack detecting means , wherein the slack detecting means comprises a rotating member and a first limit switch.
And a second limit switch, wherein the rotating member is engaged with a slack detection site of the cable,
And a portion other than the engaging portion of the rotating member is at a predetermined position.
And the position of the rotating member is
The first limit value when corresponding to the first slack amount of the bull.
When the switch is activated, the position of the rotating member is
The second limit switch is activated when it corresponds to the second slack amount.
The slack amount detected by the slack detecting means is the second slack.
The second limit switch when the
The position of the switch is movable by being pushed by the rotating member.
An automatic cable feeding device.