JPS59141114A - Method of producing sz twisted cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an SZ twisted cable in which an imaginary filament has S-twisted Z-twisted wires of a constant length.

In the conventional method of twisting filaments, a plurality of filaments are supported by two fixed support members and two rotary support members provided between both fixed support members, and then the filaments are twisted one (4) times at a constant cycle. By rotating the cylindrical rotating support member in the same direction at the same rotation speed, twisting of a fixed length is performed.

In Fig. 1, the distance between the first twisting port F, -P, is al,
The car weight II between the second punishment port P2 and F2 is I12, the fixed support member is 1°2, the distance is Ll, the rotational speed of the rotating support member 3, 40 is N1, and the take-up speed of the filament 5 is V. 1st twisting port F
,-P.

If the number of twists per unit length after t seconds between them is q (t), after 65 seconds, the number of twists N△t is added between the first twist ends F and -P, and V△tq( t) goes out, so the change in the number of twists after Δ seconds is given to the bird as q(t)2N1Xt-V△tq(t)'= (
1). Assuming that the rotation period of the rotary support member is as shown in FIG. 2(a) and q(o)-〇, the following equation can be obtained from equation (1).

q(t) is a function of the distance lI between the first plying holes 1p, and this is shown in a graph as shown in FIG. Third
As can be clearly seen from the figure, the number of twists q (t) approaches a steady state after passing through a transient state. Similarly, reverse twisting is performed at the second twisting port P2-F2. Then, when the twist start end in a transient state twisted at the first twisting port reaches the second twisting port, it is reversely twisted in a steady state.

Conventional methods in which the rotation time of the rotating support member is made equal to the stop or low-speed rotation time have the disadvantage that the once-twisted filament is untwisted, resulting in a very large elongation of the twist pitch at the twisting fulcrum. .

Therefore, the purpose of the present invention is to increase the twist pitch by 1! To provide a method for manufacturing an SZ twisted cable that performs SZ twisting while suppressing small eyes.

According to the present invention, two rotary support members are provided between two fixed support members provided at an interval, each close to the fixed support member, and the plurality of filamentary bodies pass while being supported by the members. The two rotating support members are rotated (or rotated at high speed) at the same rotation speed in the same direction for a certain period of time T, and for a period of time 'r2 that is longer than the rotation time T1.
．． The above object could be achieved by stopping or rotating at a low speed, reversing the rotary support member, and repeating this process.

During the time T during which the rotational support members 3 and 4 are rotating (or rotating at high speed), the twist starting end that was at P of the first twisting end becomes the second twisting end.
Time to move to F2 of twisting port 1. This is the time obtained by adding the time t2 for the number of twists to become half of the steady state.

Also, since it is from FIG. 3, the rotation (or high speed rotation) time T of the rotation support members 3 and 4 is as follows.

Further, the stop time h (or low-speed rotation) time 'r2 of the rotation support member is the time for the twisting end portion located at Fl of the first twisting port to reach F2 of the second twisting port JFi, 4h.

If the rotation of the rotary support member is then reversed, the twisting can be continued in the same direction as the end twisting direction without increasing the twisting pitch. The untwisted end is F2
Since the twist starts at this point, twisting can be continued in the same direction as the end.

The present invention is thus a method for manufacturing Sz twisted cables without elongation of the twist pitch.

FIG. 4 shows an embodiment of the present invention, in which the cable length is measured with a measuring device 16 provided at the front of the twisting device 6, and a preset counter is used to measure the rotation (or high speed) time and stop (or low speed) time. The length corresponding to the rotation time is set respectively, and the output signal shown in FIG. 2(c) or (d) is activated.

In addition, on the ridge of the SZ twisting device, there is an intervening layer extruder 7 that extrudes the plastic to be interposed to prevent twisting, an anticorrosion layer extruder 1 & 8 for forming an anticorrosion layer made of plastic, a cooling water tank 9, a take-up machine 11, and a winder. Trays II and 12 are provided to manufacture an SZ twisted cable.

[Brief explanation of drawings]

Figure 1 is a diagram schematically showing the twisting and binding device, and Figure 2 (
(a) and (b) show the operating status of the conventional twisting device using output signals, and (e) and (d) show the operating status of the conventional twisting device.
The operating state of the twisting device is expressed by an output signal, and FIG. 3 is a graph representing equation (2), and FIG. 4 is an example of the present invention. Symbols in the figure: l, 2... fixed support member, 3, 4... rotating support member, 5... filamentary body, 6... SZ twisting device,
7... Intervening layer extruder, 8... Corrosion protection layer extruder, 9...
・Cooling water tank, 10... Measuring device, 11... Taking machine, 1
2... Winding machine, -13... Sending machine. 5th tlD & (1) 4th m

Claims (1)

[Claims] Two rotary support members are provided between two fixed support parts provided at an appropriate interval, respectively, in close proximity to the fixed support members, and the plurality of filament bodies are allowed to pass while being supported by both of the members, After rotating the two rotary support members in the same direction for a certain period of time at the same rotation speed, they are stopped or rotated at a low speed for a time longer than the rotation time, then the rotary support members are reversed, and this operation is repeated.
A method of manufacturing a two-stranded cable.