JPH0429165B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a braided covering body, which improves productivity by keeping the take-up speed of a long body constant and eliminating the influence of tension fluctuations. .

[Prior Art] As a conventional method for manufacturing a braided covering, for example,
There is something shown in Utility Model Publication No. 48-28149,
Explain that there are the following methods for providing a coarse braided section (hereinafter sometimes referred to as a "low-density braided section" or "low-density (coarse) braided section") or a non-braided section in the middle of a braided cable. There is.

(1) Forming a coarse braided portion by intermittently increasing the cable take-off speed during braiding (hereinafter referred to as the first method).

(2) Pausing the braiding operation intermittently and continuing the cable pulling operation to form a non-braided section (hereinafter referred to as the second method).

By providing a coarsely braided part or a non-braided part in the middle of the braided cable in this way, the braid at that part can be easily dismantled, and the workability when attaching the plug is improved.

[Problem to be solved by the invention]

However, according to the first method described above, when the cable take-off speed changes from low speed to high speed, excessive tension is momentarily applied to the braided wire.
Furthermore, even in the second method described above, excessive tension is instantaneously applied to the braided wire when the braiding machine shifts from a rest state to an operating state.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a braided covering in which the take-up speed of the elongated body to which the braid is applied is constant and the influence of tension fluctuations is eliminated.

Another object of the present invention is to provide a method for manufacturing a braided covering in which the braided wire is not subject to momentary excessive tension.

Still another object of the present invention is to provide a method for manufacturing a braided covering, which improves productivity by alleviating the effects of tension as described above.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention keeps the take-up speed of the elongated body coated with the braided body constant, and rotates the braiding machine at high and low speeds depending on the braiding ratio. Picking up the long body and driving the braiding machine are performed independently by separate drive sources. The speed of the braiding machine is switched based on a comparison between the detected take-up length of the elongated body and predetermined first and second lengths. In this way, on the outer periphery of the elongated body, for example,
High-density braided portions with a braiding rate of 80% or more and low-density (coarse) braided portions with a braiding rate of 50% or less, for example, are alternately provided with the first and second lengths.

[Effect]

The take-up speed at which the elongated body is taken-up is set to a constant value determined by an independent, dedicated drive source. The rotational speed of the braiding machine is set to a control value according to the braiding rate determined by an independent dedicated drive source. This prevents momentary excessive tension from being applied to the braided wire. The braiding rate is controlled based on the detected value of the length of the elongated body that is pulled at a constant speed, and the braiding rate is controlled at a predetermined first and second speed for each of the predetermined first and second lengths. driven at high and low speeds. In this control, the braiding machine never stops. In order to obtain a predetermined shielding characteristic in the high-density braided part, the manufactured braided covering has a shielding ratio of, for example, 80% or more, preferably 90% or more.
% or more, and in order to provide a predetermined braid disassembly workability in the low-density (coarse) braided part,
For example, with a braid density of 50% or less.

〔Example〕

Hereinafter, the method of covering a braided body according to the present invention will be explained in detail.

FIG. 1 shows an embodiment of the present invention, in which a long body W is taken up by a take-up capstan 5, and a braiding machine main body 4 applies braiding to the outer periphery of the elongated body W. The braiding machine main body 4 uses the driving force of a dedicated motor Ma through a pulley 42.
The take-up capstan 5 is driven by a dedicated motor Mb. The driving force of the dedicated motor Mb is transmitted from the pulley 52 to the bevel gear 53, and then to the worm gear 54 meshing with the worm wheel 51 of the take-up capstan 5. The take-up length of the elongated body W is detected by sensors Sh and Sl based on the rotation speed of the worm gear 54. This sensor Sh,
Sl generates one pulse every time the elongated body W is pulled away by a predetermined distance a. These pulses are counted by corresponding counters Ch, Cl. Counter Ch outputs a switching signal when counting X pulses, and counter Cl outputs a switching signal when counting Y pulses. This switching signal is applied to the preset high-speed and low-speed speed measuring devices Vh, Vl.
The switches Th and Tl are turned on and off, and when one of the switches Th and Tl is turned on, one of the speed setters Vh and Vl is connected to the controller 6. The controller 6 establishes the speed of the aforementioned dedicated motor Ma based on the set speeds of the speed setters Vh and Vl.

The operation of the present invention will be explained below.

As an initial condition, it is assumed that the switch Th of the high-speed speed setting device Vh is on. At the start of the production of the braided covering, dedicated motors Ma, Mb are driven. Dedicated motor Ma is a high-speed speed measuring device
It is driven by the speed control of the controller 6 based on the set speed of Vh. On the other hand, the dedicated motor Mb is driven at a constant speed by a drive circuit (not shown).
A take-up capstan 5 is made to take over the elongated body W at a constant speed. At this time, the outer periphery of the long body W is coated with a high density (for example, 80% or more) by a braiding machine 4 that is rotated at high speed by a high-speed drive of a dedicated motor Ma.
A braid is applied. A sensor is activated every time the elongated body W is picked up by the picking up capstan 5 by a distance a.
Sh generates one pulse. This pulse is
When this happens, the elongated body W is taken away by a distance of L=aX, and the counter
Ch generates a switching signal. This switching signal turns off the switch Th and turns on the switch Tl. As a result, the braiding machine 4 is rotated at a rotational speed corresponding to the speed set by the low speed setting device Vl, and a coarse braid of low density (for example, 50% or less) is formed on the outer periphery of the elongated body W. part is formed. The sensor Sl generates one pulse each time the elongated body W is taken up by the taking-off capstan 5 by a distance a. When Y pulses are generated, the elongated body W has been pulled away by a distance of 1=aY, and the counter
Cl generates a switching signal. This switching signal turns off the switch Tl and turns on the switch Th.

In this way, on the outer periphery of the elongated body W, L=
A dense braid is formed over a distance of aX,
A low density braid is formed over a distance of l=aY. Thereafter, high-density braided portions having a distance of L and low-density braided portions having a distance of 1 are alternately formed. As a result,
A braided covering shown in FIG. 2 is obtained.

FIG. 3 shows a configuration example in which the elongated body W is an electric wire, and the elongated body W is constructed by arranging a pressure winding layer B around the outer periphery of the twisted wire core A. A braided layer 1 of thin copper wires is formed on the outer periphery of this elongated body W by the method described above, and the braided layer 1 is formed continuously (tandem method) on the outer periphery.
Then, a separator wrap layer C and a plastic extrusion layer 3 are formed. These layers may be formed in separate steps without using the tandem method.

When the electric wire shown in Figure 3 is used as an electric wire connecting electronic devices such as computers,
As shown in the figure, the low-density braided portion 11 is disassembled, and the connector 2 is connected as shown in FIG. At this time, the disassembled braid 11 is connected and fixed to the shield portion of the connector 2.

The elongated body W is not limited to an electric wire, and may be a pipe or the like. In the case of a pipe, etc., it can be mechanically reinforced by forming a braid of fine copper wire around its outer periphery. In this case, the plastic extrusion layer formed on the outer periphery may be omitted.

〔Effect of the invention〕

As explained above, according to the method for manufacturing a braided covering of the present invention, the elongated body is taken at a constant speed and the braiding machine is not stopped, so that excessive tension is not momentarily applied to the braided wire. Therefore, productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Second
The figure is an explanatory view showing a braided covering manufactured according to the present invention. FIG. 3 is an explanatory diagram showing a state in which a connector is attached to a braided electric wire manufactured according to the present invention. FIG. 4 is an explanatory diagram showing the disassembly of the braid. Explanation of symbols, 1... Braided body, 2... Connector, 3... Plastic extrusion layer, 4... Braiding machine,
5...Take-back capstan, 6...Controller, 11...
... Braid disassembly section, 41 ... Bevel gear, 42 ... Pulley, 51 ... Worm wheel, 52 ... Pulley, 53 ... Bevel gear, 54 ... Worm gear, A ... Cable twisted wire core, B ... Pressure winding Layer, C... separate layer, L... high density braided part, l... low density (coarse) braided part, W... long body,
Ma, Mb...Dedicated motor, Vh...High speed setting device, Vl...Low speed setting device, Sh, Sl...Sensor, Ch, Cl...Counter.

Claims (1)

[Scope of Claims] 1. A long body whose outer periphery is braided is picked up at a constant speed by a first driving source, and the long body is picked up based on the constant picking speed of the long body. detecting the length, and generating a braid switching signal each time the take-up length alternately reaches a predetermined first length and a second length shorter than the first length, and the braid switching signal A height formed by rotating a braiding machine driven by a second drive source at a preset first speed with respect to the first length portion of the elongate body based on Alternatingly applying a density braid and a low density braid formed by rotating the braiding machine at a constant speed at a preset second speed to the second length portion of the elongated body. A method for producing a braided covering, characterized by: