JPH0530005B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an extruded wire coating device, particularly a novel extruded wire coating device that aims to shorten the recovery time in the event of wire breakage in a thin extruded wire coating device. be.

[Prior Art] In an apparatus for coating thin extruded electric wires such as electric wires for electronic devices used for internal wiring of electronic devices, wire breakage may occur during operation.

When we investigate the causes of wire breaks, we find that the majority of wire breaks are due to material clogging in the crosshead.

Once a wire breakage occurs, the electric wire comes off from various guide rolls, guide pulleys, etc., and a lot of time is wasted in setup before starting the next operation.

[Problems to be Solved by the Invention] Conventionally, in this type of device, as a method for detecting wire breakage, a method of detecting the maximum extension of the accumulator or dancer roll has been mainly adopted.

However, with this method, it takes several seconds to several tens of seconds for the machine to stop after a wire breakage occurs.

Therefore, even if it were possible to immediately detect a wire breakage and stop the machine at the same time as the wire breaks, a machine equipped with a braking device would be able to stop immediately, but the pulleys of the guide pulley and dancer roll would be unable to absorb their moment of inertia. Therefore, it cannot be stopped immediately and continues to rotate.

As a result, the wires are drawn out and eventually come loose from the pulleys and dancer rolls.

In particular, on the sending side, the only departments that hold the wires are the sending machine and the crosshead, so it is not possible to prevent the wires from coming apart in the event of a break in the crosshead.

[Means for Solving the Problems] The purpose of the present invention is to eliminate the drawbacks of the prior art described above, to immediately detect a wire breakage and stop the machine, and to clamp the wire with a pinch roll installed just before the crosshead. Moreover, it is an object of the present invention to provide an excellent extruded wire coating device that prevents the wire from coming off from various guide pulleys, guide rolls, etc. by letting out the wire, and shortens the setup time until the start of the next operation.

That is, the gist of the present invention is to install a disconnection detection device immediately after the crosshead of an extruded wire coating device that extrudes and coats the outer periphery of a conductor that is continuously sent out with an insulator, and to install a disconnection detection device immediately before the crosshead. A pinch roll is installed at the terminal that serves both as a wire feeder and a wire clamper, and the wire breakage detection device immediately detects a wire breakage and stops the device. The extruded wire coating device is characterized in that it is configured to prevent the wire on the feeding side from coming off the guide by clamping and feeding the wire.

[Example] Next, an example of the extruded wire coating device of the present invention will be further described with reference to the accompanying drawings.

The core wire 12 is fed out from the forced feeder 1, maintained at a constant tension by the dancer roll 2, preheated by the preheater 3, and sent to the crosshead 5 of the extruder 4.
to go into.

Then, the electric wire whose outer periphery of the core wire 12 is coated with an insulator by extrusion in the extruder 4 is cooled in the cooling tank 6, and then
It is taken up by a take-up capstan 7, passed through an accumulator 8, and then wound up by a winding machine 9.

In this extruded wire coating device, various guide rolls and guide pulleys (not shown in the figure) as shown in the figure are used to change the direction of travel of the wire, prevent vibration, and stabilize the tension. .

During this manufacturing process, disconnection may occur due to various causes.

When a wire breakage occurs, the electric wire is pulled by the tension of the dancer roll 2 on the sending side and the accurator 8 on the winding side, and each wire is separated from the pulley group.

Conventional devices detect a wire breakage at the far end of the sliding pulley of the dancer roll or accumulator.

The present invention focuses on the fact that in a thin wire coating device, there are many wire breaks caused by the return of the coating material to the mandrel side in the crosshead. A wire breakage detection device 11 that senses a change in capacitance, which is advantageous for detecting the presence or absence, is installed to detect a wire breakage immediately after it occurs, and to stop each device suddenly.

At this time, it is better to continue to generate tension in the delivery dancer roll 2 and the take-up accumulator 8 to prevent line deviation.

Therefore, a pinch roll 10 is installed just before the entrance of the crosshead 5 to pinch the wire at the same time as detecting the wire breakage, and to pinch the wire in the direction of wire take-up in order to absorb the wire being fed out due to the moment of inertia of each machine on the sending side. It is a rotating roll.

A certain rotation speed is sufficient for the pinch roll, but the pinch roll stops after a certain period of time has elapsed after the rotation started.

Regarding the take-up side, take-up capstan 7
Since the wire can be held by the winder 9, no special equipment is required.

The above disconnection detection device 11 and the pinch roll 10
By installing this, it is possible to minimize the disconnection of the electric wire in the event of a wire breakage, and it is possible to significantly shorten the time it takes to start the next operation.

Note that the rotational speed of the pinch roll installed on the delivery side may be a certain constant speed as described above,
If you want to do it more strictly, it is possible to detect the delivery speed with one of the pulleys and synchronize that speed with the rotational speed of the pinch roll. In this method, the delivery speed of the pinch roll will be zero. There is no need to stop it after a certain period of time because it will stop when it stops.

[Effects of the Invention] The extruded wire coating device of the present invention, which is constructed as described above, has the advantage that the wire does not come off when the wire breaks, and the setup time until the next operation is significantly shortened.

Further, there is an advantage in that the amount of waste generated from the coating material and the electric wire when the wire is disconnected is reduced.

According to experiments, the setup time of the conventional device, which required about 40 minutes to restart operation after a wire breakage, was reduced to about 10 minutes with the device of the present invention, which is of great industrial value. There is something very big about it.

[Brief explanation of the drawing]

The accompanying drawings are explanatory diagrams showing one embodiment of the extruded wire coating extrusion apparatus of the present invention. 1: Forced delivery machine, 2: Delivery dancer roll,
3: Core wire preheater, 4: Extruder, 5: Crosshead, 6: Cooling water tank, 7: Take-up capstan, 8:
Winding accumulator, 9: winding machine, 10: pinch roll, 11: disconnection detector, 12: core wire.

Claims (1)

[Claims] 1. A wire breakage detection device is installed immediately after the crosshead of the extruded wire coating device that extrudes and coats the outer periphery of the conductor that is continuously fed out, and a wire breakage detection device is installed immediately before the crosshead that also serves as wire feeding and wire clamping. By installing a pinch roll, the disconnection detection device immediately detects a disconnection of the electric wire and stops the device, and when the disconnection is detected, the pinch roll clamps the electric wire on the sending side and sends it out. 1. An extruded wire covering device, characterized in that it is configured to prevent the wire on the sending side from coming off the guide.