JPS59218905A - Method and apparatus for automatic centering - Google Patents

Abstract

PURPOSE:To measure the outline of an electric wire without damaging the wire by measuring the outline of the wire immediately after being extruded and coated by television cameras and comparing the outline of the measured wire with the outline of a wire which has been previously recognized as a pattern. CONSTITUTION:The outline of a wire immediately after being formed with die is picked up by the television cameras arranged along the X and Y axes and these outputs are inputted to a pattern recognizing device previously storing the outline. Said device compares the input with the previously stored pattern to discriminate the shape of an extruded coat. Namely, a deviation between the normally centered wire and the input is found out, an oil pressure device is actuated through a servo amplified and centering bolts 4A, 4B of the die are adjusted to align the wire. Since the measurement itself is executed optically in this method, the measurement can be attained without damaging the wire even after being formed with the dice.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for aligning an extrusion die when applying an extrusion coating to an electric wire.

Providing the wire with a rubber-plastic coating having a uniform wall thickness typically requires manual alignment by moving the extrusion die. Since extrusion is continuous,
Manual alignment by moving the extrusion die is time consuming, while wire with unrestrained coating continues to be produced, increasing the amount of scrap wire. In order to solve this problem, a non-centering cross spatula P has been proposed in recent years, which mechanically centers the die and Nirasol in advance. It is difficult to maintain the centering function for a long period of time due to pressure imbalance, etc., and once thickness deviation occurs, the crosshead itself becomes unusable because there is no mechanism to correct this. For this reason, although this non-centering cross head +yh is used for some thin objects, it is inappropriate for application to other areas. Therefore, for large objects and large wall thicknesses, it is still necessary to use manual centering, but the problem lies in how to measure eccentricity. Generally, eccentricity is determined by peeling off the coating material and visually inspecting the cross section. Based on that judgment, the die is aligned by operating the alignment bolt. As mentioned above, this method involves significant time loss and individual differences greatly affect the judgment.

On the other hand, devices using ultrasonic waves or capacitance are being talked about as methods for automatically measuring eccentricity, but when using these devices, the measuring head must be in direct contact with the wire surface. First, the center of the coating material must be metal. Therefore, it cannot be applied to cables made by twisting a plurality of single cores.

However, since it is a direct contact, the coating material itself must be sufficiently cured, so it cannot be used immediately after extrusion. Also, even if this were possible, it would be necessary to keep a certain distance between the wire and the temocroshenod, and with twisted or twisted wires, the wire would be twisted between them due to the twisting, and even if the presence or absence of eccentricity could be known, it would not be possible. It is impossible to determine which position of the cross spatula P is located. That is, eccentricity measurements should be made immediately after the wire is extruded from the die.

An object of the present invention is to provide a method and apparatus for performing alignment in a very short time and in a short length by automatically detecting eccentricity immediately after extrusion and automatically performing alignment work at the same time.

When extruding coated material, extrude the material so that it is slightly thicker than the diameter of the die.If there is eccentricity, the material will bulge unevenly at the position immediately after the exit of the die. It was found that the wall thickness on one side was large and the thickness on the other side was small. Therefore, using this phenomenon,
It was found that almost reliable alignment work could be performed by operating the die alignment iF silt while visually observing the level of swelling.

Based on these facts, the present invention achieves the above object by optically measuring the outer shape of the wire immediately after extrusion, determining eccentricity, and automatically adjusting the die by the deviation.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a diagram illustrating the present invention in detail. That is, as described above, the covering material 3 is extruded onto the electric wire 2 fed in the die 4 of the cross spatula 11 to form a cable. At this time, by making the extrusion amount of the material slightly larger than the die diameter (approximately 30 to 50% more than the die diameter), the eccentricity is emphasized and observed. In the present invention, as shown in FIG. 2, dice li! The outer shape of the subsequent cable is imaged by a television camera 5゜6 arranged along the X-axis and the Y-axis, and the output is manually inputted to the ξ-turn recognition device 9 whose outer shape has been marked in advance. The shape of the extrusion coating is determined by comparing the two.

That is, the deviation between the normal adjustment and manual power is used to operate the hydraulic devices 7 and 8 via the Sase amplifier IO to adjust the alignment bolts 4A and 4B of the die to perform alignment.

According to the method of the present invention, since the measurement itself is carried out optically, it is possible to measure without damaging the wire even immediately after the die, there is no restriction on the shape or number of wire cores to be coated, and automation is possible. is extremely easy.

Although we have described the example of using a television camera, it is also possible to use the element system consisting of the two sets of CC phloem light-receiving parts that are arranged so as to be orthogonal; however, there is still no control over the dice part. A motor 1 drive of the centering bolt may be used instead of the hydraulic system.

[Brief explanation of drawings]

Figure 1 is a diagram showing the principle of the present invention, Figure 2 is a diagram showing the principle of the present invention.
It is a schematic diagram showing an example. 1...Cross spatula 1, 2 Wire core to be coated, 3
- Covering material, 4 - Dice, 4A, 4B... Aligning bolt, 5.6... Television camera, 7, 8 - Aligning hydraulic system, 9 - ξ turn recognition device, 10 Amplifier.

Claims (2)

[Claims] (1) Measure the outer shape of the wire immediately after extrusion coating with a television camera, compare the outer shape of the wire that has been recognized as a ξ turn in advance, and this measured outer shape of the wire, and use this to measure the eccentricity of the wire. , a self-aligning method consisting of moving the extrusion die based on the measured eccentricity. (2) a first optical measurement system disposed in a direction perpendicular to the electric wire immediately after being extrusion coated;
a second optical measurement system disposed in a direction perpendicular to the optical measurement system; a predetermined wire outline is stored in the ξ turn; A turn recognition device that compares with patterns and this
A self-aligning device consisting of an aligning and driving device that controls the position of the extrusion die according to the output of the ξ turn recognition device.