JPH025532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A device that applies a load to a wire that serves as the other electrode of an electrical discharge cutting machine for cutting a workpiece by electrical discharge machining, which serves as one electrode of electrical discharge machining, and is driven by an electric motor. It has two endless belts,
The wire is conveyed between the two endless belts at the exit of the processing area included between the two electrodes, and the driving direction of the wire between the endless belts is set within the processing area. Wire conveying devices in which the direction of movement of the wire is different from that of the wire are conventionally known. Due to the relatively large tension exerted on the wire during its passage through the processing zone, the wire is pressed tightly against one endless belt;
Where the wire enters between two endless belts, the endless belts quickly wear out.

The present invention aims to eliminate this problem. The wire loading device according to the present invention has a metal pulley in contact with one of the endless belts, the pulley ensuring direction change of the wire and directing the wire to the one of the endless belts. It is characterized by being placed so as to be pressed toward the side.

With this configuration of the invention, the force generated by the change in direction of the wire after leaving the processing area is applied directly to the metal pulley and not to the endless belt, thereby avoiding the wear of the endless belt that has hitherto been a problem.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to preferred embodiments shown in the drawings.

Referring to FIG. 1, a wire 1 serving as an electrode is fed out from a delivery spool 2, guided onto trochanters 3, 4, then abutted against a sliding electrical contact 5, abutted against a guide member 6, and then brought into contact with an electrode piece. The machining area of the workpiece 7 is reached. After passing through the workpiece 7, the wire 1 rests on a guide member 8 and a sliding electrical contact 9 and is looped around a pulley 10, which connects it to an endless belt 11 forming a belt conveyor.

The endless belt 11 has trochanters 12, 13, 14, 1
Passing over 5,16. The endless belt 11 itself is
The second endless belt 1 between the trochanters 12 and 14
7, the endless belt 17 contacts the trochanters 18, 19,
Passing over 20.

The wire 1 is attached to a take-up spool 21 at the exit of a running path formed between the two belts 11, 17.
It is wound up.

The wire 1 is inserted into the processing area, that is, through the guide members 6 and 8, so that its working portion is as straight as possible.
There is a lot of tension between them. During this machining, the workpiece 7 is moved in the X-axis direction and the Y-axis direction by a well-known moving means (not shown) in order to obtain the desired shape of the cut portion 22.

In order to apply tension to the wire 1 at the processing surface, the wire 1 is braked by one or both of the delivery spool 2 and the trochanters 3 and 4, and is also driven downstream from the processing area by an electric motor (not shown). be done. This electric motor can act on any one of the pulley 10, the rotors on which the endless belts 11, 17 are hung, or the take-up spool 21.

In order to change the direction of the tensioned wire 1 between the passage inside the processing area and the passage between the endless belts 11, 17, the pressure that must be applied to the wire 1 is made of metal so that it can withstand high pressures. is applied by a pulley 10. As shown in FIG.
come into contact with.

This tightening between the pulley 10 and the endless belt 11 applies the necessary tension to the wire 1 to keep it straight in the processing machine.

According to the modification shown in FIG.
is in contact with a brush 23 for supplying machining current to the wire 1. The brush 23 may be a carbon brush, as is known, and slides in a sleeve 25 and is under pressure from a spring 24. In this case, the pulley 10 performs three functions. That is, the pulley 10 primarily supports the force necessary to change the direction of the wire 1, which is under relatively high mechanical tension. The pulley 10 secondly makes it possible to exert a clamping force on the wire 1 to the endless belt 11. Finally, the pulley 10 supplies machining current to the wire 1.

The machining current can be supplied to the pulley 10 by sliding contacts arranged in any desired manner, which sliding contacts can cooperate with the axis of rotation 26 of the pulley 10.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram schematically showing the running path of the wire that becomes the electrode of the discharge cutting machine, Fig. 2 is a detailed diagram showing the driving form of the wire in the discharge cutting machine shown in Fig. 1, and Fig. 3 is FIG. 7 is a detailed diagram showing another driving form. Explanation of symbols, 1... wire, 7... workpiece,
10... Pulley, 11, 17... Endless belt.

Claims (1)

[Claims] 1. At the exit of a machining area formed by a workpiece serving as one electrode of electric discharge machining and a wire serving as the other electrode, the wire is sandwiched in a direction different from the traveling direction of the wire in the machining area. In an electric discharge cutting machine equipped with a wire loading device having two endless belts conveyed by one of the endless belts, said wire loading device comprises a metal pulley in contact with one of the endless belts, said pulley changing the direction of the wire and transporting the wire into the An electric discharge cutting machine characterized by being arranged so as to be pressed against one endless belt. 2 At the exit of the machining area formed by the workpiece that becomes one electrode of electric discharge machining and the wire that serves as the other electrode, two endless wires are conveyed across the wire in a direction different from the direction in which the wire travels in the machining area. In an electric discharge cutting machine equipped with a wire load device having a belt, the wire load device includes a metal pulley in contact with one of the endless belts, and a brush in direct contact with the metal pulley for supplying machining current to the wire. , wherein the pulley is arranged to change the direction of the wire and press the wire against the one endless belt.