JPS589523B2 - Tsuushin Cable No. 2 - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and an apparatus for twisting communication cable core wires into twisted wires, for example, into strands, using a two-fold twisting method.

When twisting communication cable core wires into corners using the currently commonly used two-fold twisting device, "untwisting" tends to occur in the corners due to the following reasons, and for this reason, it is not possible to lengthen the twisting pitch of the stranded wires. There are drawbacks.

(1) When the twisted wires twisted in the first twisting step are guided along the rotating frame, they are bent by nearly 90 degrees by each guide roll.

(11) When the stranded wire advances along the rotating frame, friction occurs between the rotating frame and the stranded wire.

(iii) The twisting pitch of the twisted wires progressing along the rotating frame is twice the twisting pitch of the twisted wires that are finally twisted.

This invention was invented to advantageously overcome the above-mentioned drawbacks, and by preventing the "untwisting" of the bent stranded wire, it is possible to produce a long pitched bent stranded wire.

In other words, it is an object of the present invention to provide a method for twice-twisting communication cables with high manufacturing efficiency and an apparatus therefor.

Next, the present invention will be explained in detail using illustrated examples.

FIG. 1 shows an example of the device according to the present invention, in which a presser yarn winding device 2 is provided behind a first fixed twisting die 1 that is fixed to a floor surface.

This presser thread winding device includes a stranded wire guide pipe 4 rotatably supported on a base 3 fixed on a floor surface, a presser thread winding bobbin 5 fitted on the stranded wire guide pipe, and a presser thread guide 6. It consists of

Further, behind the presser thread winding device, a rotary frame 8 is rotatably supported on a pair of bases 7, 7' fixed on the floor.

The rotary frame includes flyers 10, 10' and C, which are fixed concentrically to the side surfaces of hollow rotary shafts 9, 9' which are rotatably supported on the bases 7, 7' via rolling bearings.
Hollow pipe 1 for connecting both fryers together
1.11', and one hollow pipe 11
Twisted wire guide rolls 13, 13' corresponding to a first rotation fulcrum 12 and a second rotation fulcrum 12', which are pivoted by cutting out a part of the hollow rotation base shafts 9, 9', are rotatably attached to the strands. There is.

Furthermore, within the rotary frame, a stationary frame 14 is supported at the opposing ends of the hollow rotary base shafts 9 and 9' via rolling bearings so as to remain stationary relative to the rotational movement of the rotary frame 8. ing.

This stationary frame 14 has a hollow cylindrical stationary frame support pipe 15,
15' and a stationary frame body 16 that integrally connects both the support pipe.

Behind the one stationary frame support pipe 15, a stranded wire take-off capstan 17, a second fixed twisting die 18, and a presser yarn rewinding device 19 are installed on the stationary frame main body 16.

Furthermore, behind the presser yarn rewinding device, there is a guide roll, a dancer roll 20, a traverser 21, and a winding device 2 for the twisted wire guided through these rolls.
2 are installed on the stationary frame main body, and each is electrically and mechanically connected to a rotation drive thread (not shown).

FIG. 2 shows the presser thread rewinding device 19, in which the presser thread guide arm 25 and its guide are connected to a twisted wire guide pipe 24 rotatably supported on a base 23 fixed to the stationary frame main body 16. A support pipe 26 protruding from the side of the arm is fitted loosely, and a presser thread winding bobbin 2T is fitted concentrically to the tip of the stranding guide pipe 24, and a pulley 28 is connected to the drive motor at the other end. is fitted.

Further, the support pipe 26 of the presser thread guide arm is rotatably supported on a base 29 fixed to the stationary frame main body, and on its inner surface there are protrusions 30 protruding from the surface of the stranded wire guide pipe 24. A spiral groove (not shown) is formed which engages with the groove and forms a closed loop as a whole.

Therefore, when the stranded wire guide pipe 24 is rotated, the presser yarn guide arm and this support pipe 26 reciprocate from side to side along the traveling direction of the stranded wire by the action of the projections 30.

Note that 31 is a rotational driving thread of the stranded wire guide pipe 24, which is composed of a motor, an electromagnetic clutch, a pulley, a belt, and the like.

Next, the method of this invention will be explained.

Each communication cable core wire W sent out from a sending device (not shown) is guided to the twisting device via the first fixed twisting die 1 and the presser thread winding device 2, and the rotating frame 8 is rotated in one direction at a constant speed. When the core wires W are rotated to At the same time (combining process), a presser thread T is wound around this stranded wire Q1 to suppress the twist of the stranded wire.

Next, when the stranded wire Q1 is guided by the guide rolls 13 and 13' of the rotating frame and reaches the second rotational fulcrum 12', the stranded wire Q1 is Further, the wires are twisted in the same direction as in the first twisting step to form a stranded wire Q2 having a twisting pitch that is approximately half the twisting pitch of the stranded wire Q1 (second twisting step).

However, is the stranded wire Q2 a presser thread rewinding device? 9. Winding device 22 via dancer roll 20, traverser 21, etc.
It is wound up by.

At this time, the presser thread T on the twisted wire Q2 is transferred to the presser thread rewinding device 19 immediately after the twisted wire Q2 passes through the second fixed twisting die 18.
rewound by.

The method of the present invention involves wrapping a presser thread around the twisted wires in the first twisting step to bind the twisted wires, and then leading the twisted wires to the second twisting step to give them a twist. Since the configuration is such that the presser thread is removed and the stranded wire is wound up later, the stranded wire twisted in the first twisting process can be rolled up before being led to the second twisting process or before the second twisting process is completed. During the process,
The twist of the twisted wire will not collapse.

Therefore, the twisting pitch in the first twisting step can be increased, and the production efficiency of twisted wires can be improved.

Furthermore, when the method of the present invention is used to manufacture a cross, it is possible to obtain a cross with a good internal electrostatic coupling value without twisting.

Furthermore, since the presser thread is finally rewound, the presser thread can be used again, which is also economically effective.

Furthermore, in the device of the present invention, the second
Since the presser thread rewinding device is provided between the fixed twisting die and the winding device, and the presser thread winding bobbin is arranged concentrically with respect to the twisted wire, the proportion of the presser thread rewinding device within the stationary frame can be reduced. It has the effect of making it smaller.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away front view showing an example of a device used to carry out the present invention, and FIG. 2 is a partially cut-away front view showing an enlarged view of the presser thread rewinding device shown in FIG. In the figure, 1 is a first fixed twisting die, 2 is a presser thread winder, 8 is a rotating frame, 12 is a first rotating fulcrum, 12' is a second rotating fulcrum, 14 is a stationary frame, 16 is a stationary frame main body, 18 19 is a second fixed twisting die, 19 is a presser yarn rewinding device, 22
24 is a winding device, 24 is a stranded wire guide pipe, and 30 is a protrusion provided on the stranded wire guide pipe.

Claims (1)

[Claims] 1. A first fixed twisting die 1 and a first
A presser thread is wound around the strands twisted in the first twisting step between the strands and the rotation fulcrum 12, and then the strands are connected to the second rotation fulcrum 12' which is pivotally connected to the rotation frame. The presser yarn is not removed from the twisted wire after it is led to the second twisting step in which the wire is twisted between the second fixed twisting die 18 supported on the stationary frame and further twisted in the same direction. Communication cable 2 characterized by winding stranded wires
Degree twisting method. 2. A rotating frame rotatably supported on a base behind the first fixed twisting die, and a stationary frame supported within the rotating frame so as to be stationary relative to this rotating frame. and the rotating frame is provided with at least a first rotation fulcrum, a second rotation fulcrum and a stranded wire guide roll, and the stationary frame is provided with at least a second fixed stranding die and a stranded wire winding device. In a communication cable double-twisting device, a presser yarn winding device is provided between a first fixed twisting die and a first rotational fulcrum of a rotating frame, and a presser thread winding device is provided between a first fixed twisting die and a first rotation fulcrum of a rotating frame, and a second fixed twisting die and a twisted wire winding device are provided in a stationary frame. A device for twice-twisting communication cables, characterized in that a presser thread unwinding device having a presser thread winding bobbin arranged concentrically with respect to the twisting device is provided between the winding device and the twisting device.