JPH0370410A - Cable laying machine - Google Patents

Abstract

PURPOSE:To realize a cable laying machine which is rotated with a high balance and has a long life by a method wherein the respective rotary shafts of a pair of cable trailing rollers which are driven to the directions opposite to each other are unified with a pair of worm wheels and respective two pairs of worm gears are geared with the respective worm wheels on the lines along the diameter directions of the respective wheels. CONSTITUTION:A motor 6, a decelerator 8 and an encoder 7 are linked into one piece by a casing. Pairs of worm gears (3a, 3b) and (3c, 3d) which face each other are attached to a pair of worm shafts 2. The worm gears 3a-3b can be moved freely along the axial direction. If the motor 6 is driven, a pair of cable trailing rollers 5 and 5a are rotated to the directions opposite to each other and a cable is laid by a friction between the roller 5 and the cable. If the load exceeds the friction between the roller 5 and the cable, the cable laying is stopped, so that burning damage of the outer surface of the cable can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a compact cable stretching machine that can be detachably attached to a cable rank or cable tray.

[Traditional technique]

Conventionally, as a compact cable stretching machine, a proposal has been made in which the cable is sandwiched between a pair of opposing elastic rollers and the cable is stretched by driving the rollers with a motor. It is preferable for such a cable drawing machine to be compact and simple in structure, but when a large load is applied to the cable, a bending moment is applied to the transmission mechanism, which tends to cause failures.

Also, if a large load is applied to the cable and the load exceeds the frictional force with the rollers, the cable will stop. At this time, if the motor continues to rotate the wire drawing roller, the cable sheath will burn out due to the frictional heat.

[Means to solve the problem]

Therefore, in order to eliminate the above problems, the present invention adopts the following configuration.

That is, it has a wire drawing machine main body 1 that is detachably supported by a cable rank or a cable tray, and a pair of worm shafts 2 are attached to the wire drawing machine main body 1 in parallel with each other. Two pairs of worms 3a to 3d facing each other are provided on the pair of worm shafts 2, and the multiple pairs are arranged apart from each other in the axial direction, and the distance between the two pairs can be expanded and contracted. do. Furthermore, a pair of worm wheels 4, 4a are meshed with each of the multiple pairs of worms approximately on the diameter line. And a cable pulling roller 5 is attached to the axis of each worm wheel.
5a is fixed, the axes of the respective rollers are positioned parallel to each other, and the rollers are biased in a direction that reduces the distance between the axes, thereby driving both rollers in opposite directions.

Further, in a preferred embodiment of the present invention, in addition to the above configuration, the circumferential speed of the cable pulling roller 5 and the moving speed of the towed cable in contact with the cable pulling roller 5 are respectively detected, and the difference between the two speeds is greater than a certain level. The roller is configured to stop rotating when a speed difference occurs.

[For production]

As shown in FIGS. 2 and 3, the cable 24 is held between a pair of cable pulling rollers 5 and 5d.

Then, by driving the motor, a pair of worm shafts 2
Rotate. Then, each worm wheel 4, 4a is meshed with a pair of worms and rotates so as to apply a couple of force, which is directly applied to a pair of cable pulling rollers 5, 4a.
5a. Thereby, the cable 24 can be reliably pulled. Further, a contact roller 20 is provided in parallel with the cable pulling roller 5 as shown in FIG. 2, and this contact roller 20 rotates in contact with the running cable 24. By measuring the rotation with the cable running speed sensor 19, the running speed of the cable 24 is detected. At the same time, the rotation of the motor 6 that drives the cable pulling rollers 5, 5a is detected by the encoder 7, and when the speed difference between the circumferential speed of the cable pulling roller 5 and the running speed of the cable 24 exceeds a certain value, the motor 6 is stopped. It is something to do.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

Fig. 1 is an exploded explanatory view of the cable drawing machine of the present invention, Fig. 2 is a partially cutaway front view of the same device, Fig. 3 is a sectional view taken along the mm-m arrow in Fig. 2, and Fig. 4 is the same left. Side view, Figure 5 is V- in Figure 2
A sectional view taken along the V arrow; FIG. 6 is a schematic view taken along the Vl-Vl arrow in FIG. 3;
FIG. 7 is a schematic diagram of FIG. 6 taken along arrows -■. The wire drawing machine main body 1 of this embodiment has an almost box-like shape as a whole, and a lower surface and a pair of adjacent side surfaces are partially open so that a cable can be inserted through the side surface thereof and in a direction parallel to the side surface. do. A pair of flanges 27 are provided on the upper surface of the wire drawing machine main body 1.
are arranged facing each other, and a pair of worm shafts 2 are rotatably provided in parallel to each other via bearings between them. A driven gear 10 is fixed to one end of each of the worm shafts 2, and a driving gear 9 meshes with each driven gear 0. The drive gear 9 is fixed to the output shaft of the reducer 8. Then, the reducer 8 and the motor 6 are connected internally, and the motor 6
is provided with an encoder 7 to detect its rotational speed. In this embodiment, a motor 6, a reducer 8, and an encoder 7
are connected together by a casing, and one end of the casing is fixed to the flange 27 via a bolt. Next, each pair of worms 3a, 3b+3c+3d facing each other is attached to the pair of worm shafts 2.

Among these, warm 3a.

3b is fixed to the worm shaft 2, and the worm 3c
, 3b are attached so as to be movable only in the axial direction of the worm shaft 2. That is, the worm shaft 2 consists of a spline shaft, and the worm 3c is attached to it.

3d will fit. This spline shaft has a plurality of grooves or protrusions formed on its outer periphery, into which the protrusions or grooves on the inner surfaces of the worms 3c and 3a fit. Therefore, the rotation of the shaft is transmitted to the worm, and the worm can freely move in the axial direction. Also a pair of worms 3c,
3d are connected to each other by a worm support fitting 11 as shown in FIGS. 1, 6, and 7, and at the same time, the worm shaft 2
is arranged to move in the axial direction.

Next, a worm wheel 4 is attached to each of the worms 3a to 3d.
34a mesh with each other. One end of the rotating shaft of the cable pulling rollers 5, 5a is fixed to the boss portion of the worm wheel 4.degree. 4a. The cable pulling roller 5 located on the left side in FIG. 2 has its rotating shaft fixed to the wire drawing machine main body 1 via a bearing.

Next, the rotating shaft of the cable pulling roller 5a located on the right side is pivotally supported by a roller support fitting 18 having a T-shaped plane as shown in FIGS. 1, 2, and 3.

This roller support fitting 18 is installed inside the wire drawing machine main body l as shown in FIGS. 2, 3, and 6. One end of the roller support fitting 18 is connected to one end of the lever 23. The other end of the lever 23 is pivotally connected to the end of the handle 13, and the middle portion of the handle 13 is pivotally connected to one end of the support rod 29. These constitute a link mechanism, allowing the lever 23 to move freely into and out of the hole in the wire drawing machine main body 1.

Further, the roller support fitting 18 is urged toward the cable 24 by the elastic force of the spring 14, as shown in FIGS. 2 and 3. The spring retainer 5 that supports one end of the spring 14 is
It is screwed onto the main body so that it can be moved in and out by rotating to adjust the elastic force of the spring 14. As shown in FIG. 6, a plunger switch 22 is provided facing the wall surface of the roller support fitting 18, and is turned on and off in conjunction with the movement of the roller support fitting 18 into and out. This plunger switch 22 is used to rotate a cable support roller 16, which will be described later, from the solid line state to the chain line state in FIG. 3, thereby dropping the cable and storing it in the cable tray. That is, the cable support roller 16 is
As shown in the drawings and FIG. 3, it is arranged to be perpendicular to the axis of the cable 24 and to support the lower surface of the cable 24. The shaft of the cable support roller 16 is formed in a dogleg shape, and its center portion is pivotally connected to the wire drawing machine main body 1. The other end of the shaft is pivotally connected to the movable shaft of the electromagnetic plunger 17.

Next, an arm 21 is welded and fixed to the outer periphery of the wire drawing machine body 1, and is horizontally suspended over the upper end of a cable tray 28 as shown in FIG. This arm 21 is engaged with a support member that suspends the cable tray 28 from the ceiling or the like, and is fixed so as not to move in the direction of cable extension. 6, by moving the handle 13 to the left, the roller support fitting 18 is pulled to the right. Then, when the cable 24 is inserted between the pair of cable pulling rollers 5 and 5d as shown in FIGS. 2 and 3 and the handle 13 is returned to the free state, the cable 24 is pulled between the pair of cable pulling rollers by the biasing force of the spring ray. It is sandwiched between 5 and 5a. At this time, cable 2
The lower surface of 4 is supported by a cable support roller 16. Next, by driving the motor 6, the pair of cable pulling rollers 5.5a are rotated in opposite directions. Then, the cable 24 is extended due to the frictional force between these rollers and the cable 24. During the extension, an excessive load is applied to the cable 24, and when the load exceeds the frictional force between the cable pulling roller 5 and the cable 24, the cable 24 stops. Then, the contact roller 20 in contact with the cable 24 stops, and the cable 2
An output signal indicating that the wire drawing speed of No. 4 is zero is input to a control device (not shown). Then, the motor 6 stops, thereby preventing the outer periphery of the cable 24 from being burnt out due to frictional heat. In this embodiment, the cable running speed sensor 19 is formed of a photosensor type counter.

That is, a large number of holes are formed in a disc that is integral with the contact roller 20, and the period at which light passes through and is blocked is measured. However, the cable running speed sensor 19 is not limited to this type, and any known suitable sensor may be selected. When the wire drawing machine completes the drawing of the cable 24, the motor 6 is stopped, the handle 13 is moved to the left in FIG. 6, and the roller support fitting 18 is pulled back to the right. Then, the plunger switch 22 is turned on and the electromagnetic plunger 17 is turned on. Then, the cable support roller 16 moves from the solid line state to the chain line state, and the cable 24 falls downward and is stored in the cable tray 28. In this way, cable 2
4 can be extended.

〔Effect of the invention〕

This wire drawing machine consists of a pair of rotating shafts of cable pulling rollers 5 that are driven in opposite directions, and a pair of worm wheels 4, 4.
a, and a pair of worms 3a, 3b and worms 3c, 3d mesh with each other on the diameter line of each worm wheel 4, 4a, so that the cable pulling roller 5
．． 5a can be rotated in a well-balanced manner to provide a wire stretching machine with a long life. Also, the worms 3c, 3 are placed on the worm shaft 2.
The cable pulling roller 5a is biased in the cable clamping direction as d moves, and cables of various thicknesses can be reliably pulled. Moreover, it is possible to manufacture a compact wire drawing machine with a simple tank bottom, a small number of parts, and no failures.

Next, the invention described in claim 2 detects the circumferential speed of the cable pulling rollers 5, 5a and the moving speed of the cable, and when a speed difference of more than a certain value occurs between the two speeds, the cable pulling roller 5 , 5a, so that the outer surface of the cable can be reliably prevented from being burnt out during overload.

[Brief explanation of drawings]

Fig. 1 is an exploded explanatory view of the cable drawing machine of the present invention, Fig. 2 is a partially cutaway front view of the same device, Fig. 3 is a sectional view taken along the mm-m arrow in Fig. 2, and Fig. 4 is the same left. Side view, Figure 5 is V- in Figure 2
A sectional view taken along the V arrow, FIG. 6 is a schematic view taken along the vr-vt arrow in FIG. 3,
FIG. 7 is a schematic view of FIG. 6 in the direction of the ■-■ arrows. 1... Wire drawing machine body 2... Worm shaft 3 a, 3
b, 3c, 3d - Worm 4.4a... Worm wheel 5.5a... Cable pulling roller 6... Motor 7... Encoder 8... Speed reducer 9... Drive gear IO...・Driver gear
11... Worm support fitting 12...? n
13...Handle 14...Spring 1
5... Spring presser 16... Cable support roller 17... Electromagnetic plunger 18... Roller support fitting 19... Cable running speed sensor 20... Contact roller 21... Arm 22...
Plunger switch 23...Lever 24...Cable 25...
・Protrusion 26... Pivot point 27... Flange 28... Cable tray 29... Support rod

Claims (1)

[Claims] 1) A wire drawing machine main body (1) that is detachably supported on a cable rack or cable tray, a pair of worm shafts (2) that are attached to the main body (1) in parallel to each other, and Two pairs of worms (3 a to 3
d), a pair of worm wheels (4) (4a) that mesh with each pair of worms approximately on a diametrical line, and fixed to the shaft of each of the worm wheels (4) (4a),
A cable extension comprising a pair of cable pulling rollers (5) (5a) whose respective axes are positioned parallel to each other and are driven in opposite directions while being biased in a direction to reduce the distance between the two axes. Line machine. 2) In claim 1, the roller (5) or (5a
) and a moving speed of a towed cable in contact with the roller, and are configured to stop the rotation of the roller when a difference of more than a certain value occurs between the two speeds. .