JPS6112323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to paper or plastic tape-wrapped insulated wires, and more particularly to a device for detecting gaps between tapes in the manufacture of lap-wound insulated wires.

Tape winding for insulation is usually provided by lap winding, but gaps or gaps may occur between the windings due to changes in the tension of the supplied tape, which may deteriorate the uniformity of the insulation properties such as the corona properties of the wire. . Therefore, when such a gap occurs, it must be detected and promptly corrected.

Two methods are used to detect gaps that occur in conventional tape winding operations: one is by human monitoring, and the other is by a single reflective phototube.

Here, a simple explanation of a reflective phototube is that it has its own light-emitting device, and the light emitted from the device is directed toward a predetermined target (in this case, a tape-wrapped insulated wire), and the light is reflected from there. It is configured so that the surface condition of the object can be detected by receiving light.

Although the monitoring method is reliable, in cases such as the manufacture of electric wires where multiple layers of tape are applied, the gap of the first layer of tape is covered by the second layer of tape and cannot be visually recognized. In addition to being inconvenient, it is disadvantageous in terms of human economy.

Further, the latter method using one phototube is advantageous in detecting a gap of a certain width or more, but if the gap width is small, detection may be impossible in principle. That is, in the conventional phototube type gap detection mechanism shown in FIG. 1, the phototube 1 rotates integrally with the tape support (not shown) and the rotation axis of the phototube 1 (in the direction indicated by the arrow in the figure).
If the relative positional relationship with the winding of the first layer tape winding 3 on the electric wire 2 that moves only in the direction of the electric wire 2 is as shown in FIG. The gap does not fall within the detection range, and this condition is not improved even if the tape winding progresses as shown in FIGS. 1B and 1C. Note that 4 in the figure is the second layer tape winding. These deficiencies of the conventional methods can be improved by expanding the detection range of the phototube, by making the tape narrower, or by installing the phototube stationary. An increase in the detection range of the phototube is disadvantageous in terms of detection sensitivity, a reduction in tape width is a disadvantage in terms of wire manufacturing speed, and when using a solution with a stationary arrangement of the phototube, rotation around the wire is disadvantageous. In practice, it is difficult to find an installation location that will not be disturbed by the tape winding device.

An object of the present invention is to provide an apparatus for detecting gaps between tape turns that can eliminate the defects in detecting gaps between tape turns of a tape-wound insulated electric wire using the conventional phototube.

The above objects of the present invention can be achieved by using a plurality of phototubes and using the logical sum of the phototube outputs to detect gaps between tape turns in a multilayer tape winding device. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained in detail below based on an embodiment shown in the drawings.

FIG. 2 is a schematic diagram showing an embodiment of the present invention.

In FIG. 2, a rotating frame 6 is provided which is appropriately configured and supported so as to rotate around the electric wire 2,
Tape rolls 9,
9' is supported. The tapes 3, 4 from the tape rolls 9, 9' are transferred to suitable guide rolls 11, 11'.
is guided to the electric wire 2 through the rotation of the rotating frame 6, and is wound around the electric wire 2 which moves at a constant speed in the direction of the rotation axis of the rotating frame 6 (in the direction indicated by the arrow in the figure). In this embodiment, tape 3 from tape roll 9 forms the first layer tape wrap and tape 4 from tape roll 9' forms the second layer tape wrap.

According to the present invention, a support stand 12 is fixed to the rotary frame 6 at a position where the first layer tape winding is performed using the tape 3, and a pair of reflective phototube devices 13, 13' are mounted on the support stand 12. Placed. The number of phototube devices on the support stand 12 may be plural, the angular intervals should be equal, and the heights of the phototube devices above the support stand 12 should meet the following relationship so that their detection ranges are continuous with each other. Therefore, an appropriate difference has been made.

Number of phototubes≧tape width/phototube detection range - By doing this, even if the gap width between tape turns is extremely small, at least one of the plurality of phototubes can detect it. It turns out.

The outputs of these phototube devices are applied to an OR circuit (not shown), and at least one of these phototube devices
If there is a detection output for each, it causes the OR circuit to generate an output. The output of this OR circuit is taken out through a suitable slip ring or the like, and is used to control necessary devices such as alarms, stopping the rotation of the rotating frame 6, and stopping the feeding of the electric wire 2. Since these controls are obvious to those skilled in the art, detailed explanation will be omitted.

As described above, according to the present invention, by appropriately arranging a plurality of phototube devices and calculating the logical sum of their outputs, it is possible to detect gaps between tape windings in any case. The aforementioned drawbacks in the production of insulated wires can be overcome.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the prior art, and FIG. 2 is a diagram showing an embodiment of the present invention. 1, 13, 13'...Reflection type phototube device, 2...
...Electric wire before tape wrapping, 3, 4...Tape, 6...
6...Rotating frame, 9,9'...Tape roll, 1
1,11'...Guide roll.

Claims (1)

[Claims] 1. A multiple tape winding device having a plurality of tape rolls and a frame body that rotates around a moving electric wire so as to wrap the tape from the tape roll around the electric wire as the electric wire moves, A plurality of reflective phototubes are arranged on the frame body at intervals such that their detection ranges partially overlap each other in the moving direction of the electric wire, and when a gap occurs between the tapes during tape winding, it is possible to remove the gap from the surface of the electric wire. A device for detecting a gap between tape windings in a tape-wound insulated wire, which detects the difference in reflectance on the tape surface.