JPH0326754Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a cable delivery device that sends out a cable while pinching it between endless belts.

(Technical background of the invention) The present applicant previously proposed a cable feeding device suitable for laying optical fiber cables with weak mechanical strength and communication cables with relatively small diameters. That is,
This cable feeding device has a configuration in which a driving pulley and a driven pulley are rotatably supported on a pair of pulley supports, and an endless belt is wound between these pulleys. The cable is held between the cables and sent forward at a predetermined speed, making it possible to lay cables with poor strength by simply applying a small tensile force.

In a cable feeding device using such an endless belt, it is necessary to adjust the interval between the endless belts according to the diameter of the cable to be fed, so a belt spacing adjustment mechanism is provided in the device to support a pair of pulleys. The interval between the endless belts is adjusted by moving the stands closer together or farther apart.

On the other hand, due to the above function, the tension of the endless belt changes depending on the diameter of the passing object. If the tension of the endless belt is weak, the cable will slip and the cable cannot be fed smoothly, and if the tension is too strong, the belt will wear more and the life of the belt will be shortened. Therefore, in this cable feeding device, the driven pulley is moved toward or away from the drive pulley on the pulley support base using a belt tension adjustment mechanism, and the endless belt is set to a predetermined tension.

(Problems in the background art) By the way, when laying a cable, it is necessary to pass not only the cable but also the traction rope, pulling eye, or cable connection part between the endless belts, but the diameter of these is different from the cable diameter. Therefore, it is not possible to continue the cable feeding operation simply by adjusting the interval between the endless belts according to the cable diameter. For this reason, conventionally, each time a cable connection part, etc. is passed between the endless belts, the cable feeding operation is temporarily interrupted, the interval is adjusted to correspond to the connection part, etc., and after passing, the interval is adjusted again to correspond to the cable diameter. The cable is fed out by making adjustments. but,
If the belt spacing is adjusted not only for the cables but also for the connections, etc., the adjustment work will take a lot of time, and the cable feeding work will have to be interrupted each time the adjustment is made, resulting in work efficiency. decreases significantly.

(Purpose of the invention) An object of the invention is to provide a cable delivery device that can continuously send out cables, cable connections, etc. without adjusting the belt interval between a pair of endless belts.

(Summary of the invention) The invention provides a cable feeding device in which a plurality of presser rollers are rotatably supported by a holder on a pair of pulley support bases that are supported so as to be able to approach and separate from each other. , the screw member attached to each pulley support base is screwed into the rotatably supported nut member, and a spring member applies a pressing force to the screw member in the direction of pulling it out from the nut member, thereby forming the connecting part of the endless belt. When the pair of pulley support stands approach or separate due to such clamping, the screw member is moved backward or forward by rotating the nut member, thereby automatically adjusting the interval between the endless belts.

(Embodiments of the invention) Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

As shown in FIG. 4, the cable feeding device according to the present invention includes a driving pulley 1, a driven pulley 2, and a pair of pulley supports 3 on which both of these pulleys are rotatably supported. An endless belt 4 is wound around the driven pulley 1 and the driven pulley 2. Each drive pulley 1 is rotated in opposite directions by a drive motor (not shown) via a drive mechanism. Therefore, the cable 5 held between the endless belts 4, 4 is continuously sent forward by the rotation of these belts.

A plurality of presser rollers 6 are provided between each drive pulley 1 and driven pulley 2 along the sending direction A of the cable 5.
is installed. These pressing rollers 6 are rotatably supported by a support member 7, as shown in FIGS. 1 and 4. On the other hand, a plurality of holders 8 made of cylinders 10 and 12 are mounted on the pulley support base 3.
are fixed via bolts 9. Each cylinder 10
As shown in FIG. 1, the opening faces the presser roller 6 side, and the coil spring 11 is housed inside.
In addition, a small-diameter cylindrical body 12 is fitted so as to be able to protrude freely. A bracket 13 is fixed to the cylinder 12, and the support member 7 is pivotally supported on the bracket 13. Therefore, the cylindrical body 12 protrudes from the cylindrical body 10 due to the elastic force of the coil spring 11 and presses the support member 7 via the bracket 13, so that the plurality of presser rollers 6 press against the pulley 1 as shown in FIG. The opposing belt portions 4a, 4a of each endless belt 4 located between the two are pressed in a direction toward each other, and these belt portions 4a, 4a are brought into contact with the circumferential surface of the cable.

1 and 4 between the pair of pulley support stands 3.
As shown in the figure, a base 14 is provided that extends parallel to the cable delivery direction A. This base 14 is fixed on a main body (not shown), and each pair of support rods 15 extends from the center thereof in a direction orthogonal to the longitudinal direction, as shown in FIG. A coil spring 16 is positioned between each pair of support rods 15, 15 and the base 14, so that each pulley support stand 3 is movably supported. Base 1
Between the support rods 15 and 15 of No. 4, threaded portions 17 are provided at both ends.
A screw shaft 17 having shafts a and 17a is rotatably passed through and supported. Both ends of the screw shaft 17 penetrate through the pulley supports 3, 3, and the screw portions 17a, 17a are provided with thread grooves in opposite directions, into which screw plates 18 are screwed, respectively. Plate guide rods 19, 19 whose tips are screwed into the pulley support base 3 are slidably passed through both lengthwise ends of the screw plates 18.

Now, a screw member 20 is fixed to the outer wall surface of each pulley support stand 3, as shown in FIGS. 1 and 3. A screw shaft 17 passes through the screw member 20 and has a threaded portion 20A on the distal end side. On the other hand, a nut member 21 is attached to the screw plate 18.
is rotatably attached via a bearing 22. As shown in FIG. 2, this nut member 21 is provided with teeth 21A on its inner peripheral surface, into which the threaded portion 20A of the screw member 20 is screwed. A plate member 23 is arranged between the nut member 21 and the pulley support base 3. The screw member 20 passes through this plate member 23, and the nut member 2
1 is rotatably mounted via a bearing 22'. A coil spring 24 is arranged between the plate member 23 and the flange portion 20B of the screw member 20.

On the other hand, the belt tension adjustment mechanism moves the driven pulley 2 on the pulley support stand 3 so as to approach or separate the driven pulley 1 from the drive pulley 1.

As shown in FIG. 5, a tightener shaft 30 to which the driven pulley 2 is attached is disposed on the inner wall surface of the pulley support base 3 that supports the driven pulley 2. As shown in FIG. A bolt 31 passes through the tightener shaft 30 via a fixing plate 32. A coil spring 33 is disposed between the tightener shaft 30 and the pulley support base 3.

Now, when the drive pulley 1 is driven and the belt portion 4a of the endless belt 4 continuously holds and sends out the towing rope, etc., forward, if a cable connection part 5a that is thicker than the diameter of the towing rope, etc. is sent in, the belt The portions 4a are pressed away from each other by this cable connection portion 5a. Therefore, slack occurs in the belt portion 4a, and the tension of the endless belt 4 fluctuates.

Therefore, by extending the coil spring 33 within the pulley support base 3 by its elastic force, the driven pulley 2 is displaced in the direction away from the driving pulley 1.
The slack of the endless belt 4 is eliminated, and as a result, the tension of the endless belt 4 is kept constant.

With the belt interval adjustment mechanism and belt tension adjustment mechanism described above, cables and the like can be smoothly sent forward while maintaining a predetermined clamping pressure.

Next, the manner of use of the cable feeding device according to the present invention will be explained.

First, as shown in FIG. 3, a torque wrench is inserted into the square hole 17b provided in the end face of the threaded portion 17a of the screw shaft 17, and the screw shaft 17 is rotated in one direction. As a result, as shown in FIG. 1, the screw plate 18 screwed into each screw portion 17a approaches the base 14, and the screw shaft of the screw member 20 screwed therein approaches the base 14 via the nut member 21. 17, the pair of pulley supports 3, 3 move toward each other. Therefore, the interval between the endless belts 4, 4 is reduced in order to sandwich the small-diameter towing rope.

Next, drive the drive pulley 1 to drive the endless belt 4,
The towing rope B is continuously held and sent forward by the belt portions 4a, 4a of 4. If a cable 5 with a diameter larger than the diameter of the tow rope is sent in after the tow rope B is sent out, the belt portions 4a, 4
a are pushed away from each other by this cable 5. Therefore, the plurality of presser rollers 6 contract the coil spring 11 within the cylindrical body 10 against its elastic force due to the pressing force from the cable 5, and move the belt portion 4a in a direction away from the other opposing belt portion 4a. Transition to. Therefore, the cable 5 is pinched by the belt parts 4a, 4a and sent forward in the same way as a traction rope, without adjusting the interval between the belt parts 4a, 4a.

Now, as shown in FIG. 4, when a cable connection part 5a with a larger diameter is sent between the belt parts 4a, 4a, the coil spring 11
The pulley supports 3 are compressed to the limit within the pulley support 3, and a pressing force is applied to the pair of pulley supports 3 in the direction of separating them from each other. Therefore, as shown in FIG. 1, since the screw member 20 is pressed in the direction of the arrow C against the elastic force of the coil spring 24, the teeth 21A of the nut member 21 engage with the thread groove of the screw member 20. Since it matches,
The screw rotates to increase the amount of threading of the threaded portion 20A of the screw member 20. That is, the screw member 20 is linearly advanced in the direction of arrow C. Therefore, the pair of pulley supports 3 move away from each other,
Since the distance between the belt portions 4a, 4a is further increased, the cable connecting portion 5a can be sent forward while being compressed.

On the other hand, when the cable 5 passes through the cable connection part 5a and is fed in again, the elastic force of the coil spring 24 causes the screw member 20 to
is pressed in the opposite direction, the nut member 21 rotates in the opposite direction and the screw member 20 retreats to its original position. Therefore, the pair of pulley supports 3 also return to their predetermined positions, and the distance between the belt portions 4a, 4a becomes smaller, so that the cable 5 can be sent forward as it is while being pinched.

(Effects of the invention) According to the invention, a screw member is attached to a pair of pulley support stands provided with a presser roller that is rotatably supported by a holder, and a screw member is attached to a nut member that rotatably supports the screw member. By applying a pressing force to the screw member in the direction of pulling it out from the nut member using a spring member, the amount of screwing of the screw member into the nut member can be adjusted in accordance with the diameter of the cable or cable connection part, etc. By rotating the nut member, the pair of pulley supports can be moved toward or away from each other. Therefore, simply by adjusting the interval between belt parts of the endless belt to a small value, cables and their connecting parts can be continuously fed out. Therefore, the cable installation work becomes simple, and the cable can be sent out without interruption, so that the time required for cable installation can be significantly shortened.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of the cable feeding device according to the present invention, Fig. 2 is a sectional view of the nut member, Fig. 3 is an exploded perspective view of the main parts of the cable feeding device according to the invention, and Fig. 4 5 is a plan view of the cable feeding device according to the present invention, and FIG. 5 is a partial sectional view of the belt tension adjustment mechanism. 1... Drive pulley, 2... Driven pulley, 3...
Pulley support base, 4...Endless belt, 5...Cable, 6...Press roller, 8...Holder, 17...
...Screw shaft, 18...Screw plate, 20...Screw member, 21...Nut member, 22, 22'
……bearing.

Claims (1)

[Scope of utility model registration request] A pair of pulley support stands disposed in parallel and supported so as to be able to approach and separate from each other, and having driving and driven pulleys supported at both ends along each longitudinal direction, and between the respective driving and driven pulleys. a pair of endless belts that are wound around each other and are fed out while sandwiching the cable by driving each drive pulley; A cable feeding device comprising a plurality of presser rollers that engage with a belt portion that is attached to the belt, and a holder that rotatably supports the plurality of presser rollers on the pulley supporter, the screw member being attached to the pulley supporter. a nut member which is rotatably supported and into which the screw member is screwed, and which rotates as the screw member moves when the pulley support base approaches or separates; A cable feeding device comprising: a spring member that applies a pressing force in a direction in which the cable is pulled out of the cable.