JPS5849529Y2 - Element wire twisting device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for twisting strands of wire, and more specifically, to a device that gives a twist to the strands in the middle from the sending device to the twisting device when twisting the strands of communication cables. It is.

The applicant previously obtained the following from Japanese Patent Publication No. 54-24016:
An application was filed for a ``method for unwrapping twisted wires,'' in which the wires are wound around a twist roller at least once, and then the twist roller is rotated around the center axis of the wires, and the number of rotations is adjusted periodically. We have disclosed a technology that gives the strand one turn by increasing or decreasing the amount of the wire.

This method has the advantage of being able to effectively impart twist to the strands using extremely simple equipment, and speeding up the production of communication cables with good electrical properties. The reason why one time is granted is disclosed in detail in the specification of the above-mentioned patent application.

However, according to this method, the strands are passed around the twisting roller at least once, so there is a part where the strands overlap twice in the groove of the twisting roller, and in this part the strands rub against each other. This may cause the inconvenience that the coating may be damaged.

In addition, as shown in Japanese Patent Publication No. 48-27210, for example, as a conventional screwing device, three rollers are arranged in a staggered manner in the direction of movement of the strand, and the strand is sandwiched between them. There are known devices that restrict the rotation of strands.

However, in this dog device, when the torsional rigidity of the wire is large, the wire is moved by rollers arranged in a staggered manner.
Even if the wire is bent in a <'' shape, the angle of change in direction of bending is small, so twisting deformation at one end of the constrained portion of the strand easily spreads to the other end, which has the disadvantage that rotational constraint is not effective. .

This invention provides a novel wire wrapping device that can eliminate such inconveniences and more effectively apply curling to the wire.

Next, an embodiment of this invention will be described with reference to the drawings.

In FIG. 1, reference numeral 10 and 10 denote bases arranged opposite to each other, on which a hollow B-shape having a large diameter at the center is rotatably supported.

One hollow tube is provided for each strand of wire,
Figure 1 shows the equipment used for quad twisting.
Four hollow tubes 11, 12, 13 and 14 are shown.

Inside each hollow space, a first restraint roller 15 and a second restraint roller 18 are rotatably provided so that the outer peripheral part of the groove is in contact with the central axis of the hollow tube, and between these restraint rollers E is provided. are the first guide roller 16 and the second guide roller 17
is also rotatably mounted.

The first guide roller 16 and the second guide roller 17 are arranged on opposite sides with respect to the central axis, and the first guide roller 16 is close to the second restraint roller 18 side, and the second guide roller 17 is located near the first restraint roller 18. 15 side, and is biased as far away from the central axis as possible within a range that does not increase the centrifugal force of the entire device.

The strand W is routed from the outer periphery of the first restraining roller 15 to the first guide roller 16 , and further passes through the second guide roller 17 to reach the second restraining roller 18 .

Therefore, in the section from the contact point P1 with the groove outer periphery of the first restraining roller 15 to the contact point P2 with the groove outer periphery of the second restraining roller 18, the strand changes direction twice by approximately 180 degrees in the middle. first restraint roller 15, first guide roller 16,
The four rollers of the second guide roller 17 and the second restraint roller 18 are strongly contacted and engaged over a considerable length of the groove, and the element is broken by the frictional force between the strand and the groove periphery of each of these rollers. Twisting of the wire is prevented, which is essentially the same as if the wire were run around a single roller with a circumference equal to the distance from point P1 to P2 along the travel path of the wire. means the same.

Each of the hollow tubes 11 to 14 is driven via a pulley 19 attached to its end, a prime mover 21, and a transmission 20 to have a rotational speed that periodically increases or decreases.

The details are of course specified in the specification of the above-mentioned patent application, but what I would like to point out here is that in this invention, this periodic increase and decrease is non-step function-like.

Conventional driving methods for the same device include, for example, a method in which the values of the number of rotations of 100 and -n are periodically taken mutually, as in the famous storage inversion method, or as shown in the above-mentioned Japanese Patent Publication No. 48-27210. 1koN2+αtN2-α(α(N2
) is taken periodically, with time on the horizontal axis,
When expressed on a graph with the rotational speed on the vertical axis, it is a straight line parallel to the time axis, that is, a step function (5 step function).
ion)-like change.

However, in this invention, it is important that the change curve has a triangular mountain shape, a rounded gradual rise or fall shape, or in other words, a non-step function change.

The device of this invention described above is installed between the strand feeding device and the stranding device, and of course the strand feeding device is on the upstream side of this device, and the strand plate 3 is on the downstream side of this device.
A twisting die 4 and a twisting device are arranged.

Figure 2 shows the twisting device 2 of this invention used, and a double-twisting type twisting machine 5 as the wire twisting device, to give a twist to each of the four strands fed out from the feeding device 1. rear,
This figure shows the entire quad twisting device that performs quad twisting.

As detailed above in this design number 1, a restraint roller and a guide roller are provided, and the two rollers work together to prevent twisting of the strands around the axis. Furthermore, by making the guide roller deviate from the center axis of the restraining roller f, a sufficient rotational restraining force can be applied to the wire. By arbitrarily arranging them close to the axis of rotation within a range, it is possible to prevent centrifugal force from becoming excessive when the hollow tube is rotated, and therefore has the effect of enabling high-speed operation.

Of course, the periodic increase and decrease of the drive rotation speed of the device is not a discontinuous step function like in the conventional case, but a smooth gradual increase and decrease, which not only enables high-speed rotation but also improves the drive mechanism. It also has the effect of not causing any damage.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a device according to an embodiment of this invention, and FIG. 2 is a simplified side view showing the entire quad stranding device using this device. 10...Base, 11-14...Hollow tube, 15...First restraining roller, 18...
Second restraint roller, 16...First guide roller, 1
7... Second guide roller, 20... Transmission device, 21... Prime mover.

Claims (1)

[Scope of utility model registration request] A plurality of hollow tubes 11 to 14 rotatably attached to the base
and a first restraint roller 15 and a second restraint roller 18 which are rotatably provided in the hollow tube and whose groove outer periphery is in contact with the center axis of the hollow tube, and between the two restraint rollers with respect to the center axis. On opposite sides, the second
A first guide roller 16 provided close to the restraining roller side, a second guide roller 17 provided close to the first restraining roller side, and a drive that rotates the plurality of hollow tubes at a rotation speed that periodically increases or decreases. A device for twisting strands of wire, which has a device.