JPS6010855B2 - Wire feeding device for wire cut electrical discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire feeding device in which a wire electrode is naturally unwound and fed from a wire reel in a wire-cut electric discharge machine.

As a conventional wire feeding device, there is one shown in FIG.

In this conventional device, the wire electrode 6 is wound around the wire reel 2, and when the wire electrode 6 is pulled through the wire roller 7, the wire reel 2 rotates together.

However, such a conventional configuration has the drawback that the wire tension fluctuates due to uneven rotation of the wire reel or changes in the moment of inertia due to changes in the amount of wire wound around the wire reel.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional devices, and provides a wire feeding device that eliminates the factors that most affect fluctuations in wire tension and can measure the stability of wire tension. The purpose is to provide.

Hereinafter, this invention will be explained based on the drawings.

FIG. 1 shows an embodiment of this feeding device. In FIG. 1, numeral 1 denotes a wire reel mounting and fixing plate, which is fixed to the machine body.

2 is a wire reel that is attached and fixed to the fixed plate 1; 3 is a wire guide rod that is attached to the wire reel 2 and has a tapered part that becomes thinner toward the tip; 4 is a wire guide hole that is fixed to the machine; 5 is also a wire guide hole that is fixed to the machine; A wire holder using felt is fixed to the machine, and 6 is a wire electrode (hereinafter referred to as wire).

), 7 is a wire roller for changing the direction. Second
3 and 3 respectively show other embodiments of the device of this invention, and the only difference from the embodiment shown in FIG. 1 is the mounting direction of the wire reel, and the other parts are the same as in FIG. 1. It is something.

In the embodiment of FIG. 1, the wire 6 from the wire reel 2
When it is pulled, it naturally unravels, and after passing through the guide hole 4 and being guided by the guide rod 3, it passes through the wire presser 5, and the wire roller 7 changes the direction and sends it out.

Here, since the guide rod 3 is slightly inserted into the guide hole 4, the wire 6 is not twisted. Further, since the wire 6 is held down by the wire presser 5, the wire 6 which has unraveled naturally will not come off. Further, since the wire reel 2 is fixed, while the wire 6 is being supplied, there is no uneven rotation of the wire reel 2 or a change in the moment of inertia due to a change in the amount of the wire 6, unlike in the conventional case. Therefore, the above configuration does not cause fluctuations in the tension of the wire 6. In the embodiment shown in FIG. 1, the wire 6 is very easy to unravel due to its own weight.

Further, in the embodiment shown in FIG. 3, since the weight of the wire 6 and the direction of tension are opposite to each other, it is difficult to twist. The embodiment shown in FIG. 2 takes an intermediate position between the two. In summary, this inventive device is a modification of the wire reel, which was the most problematic problem with wire tension fluctuations in conventional wire-cut electric discharge machines, and fixes the wire reel and unwinds the wire naturally. This eliminates tension fluctuations and promotes stable machining. The effects of its implementation are extremely large. In particular, with this invention device, the 7
Since the wire is pulled along the guide rod that has a part of the guide rod and unravels naturally, the wire is guided without twisting, and the resistance to the wire coming out from the guide rod is alleviated, resulting in good guidance. It will be Tsukasa Doro.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the wire feeding device according to the present invention, and FIGS. 2 and 3 show other embodiments in which the position of the wire reel in the embodiment of FIG. 1 is changed. FIG. 4 is a front view showing a conventional wire feeding device. Note that the same reference numerals in the figures indicate the same or corresponding parts. 2 is a wire reel, 3 is a guide rod, 5 is a wire presser, 6
is a wire electrode, and 7 is a wire lo-fu. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A wire reel mounting fixing plate fixed to the machine body of a wire cut electrical discharge machine, a wire reel fixed to the fixing plate and around which a wire electrode is wound, and a tapered part attached to the wire reel and tapered toward the tip. a guide rod that guides the wire electrode that is naturally unwound from the wire reel when pulled, and a wire presser that is disposed in a supply path of the wire electrode and allows the wire electrode guided by the guide rod to pass through. A wire feeding device for a wire cut electric discharge machine equipped with a wire roller and a wire roller.