JP2517574Y2 - Automatic wire-type wire electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an automatic wire connection type electric discharge machine equipped with an automatic wire connecting means.

[Prior Art] A conventional automatic wire-connection type wire electric discharge machine will be described with reference to FIG.

This type of automatic wire-connection type wire electric discharge machine has a head unit 2
And the lower wire guide 4 and the work fixing base 6 are generally configured.

Then, the wire 8 is automatically fed (automatically connected) from the head portion 2 to the lower wire guide 4, and the wire 8 is stretched between the tip of the head portion 2 and the lower wire guide 4, while the work 10 Is placed on the work fixing table 6 and the wire 8 and the work 10 are relatively moved in a two-dimensional manner,
The electric discharge machining of the work 10 is carried out.

Wire 8 in head part 2 and lower wire guide 4
The wire 8 supplied from the wire supply bobbin 12 includes a damper pulley 14, a pulley 16, a brake roller 18 interlocking with the pulley 16, a wire retainer 20,
It is guided to the feeding die 28 and the die guide 30 at the tip of the head portion 2 through the support pulley 22, the wire feeding roller 24, and the limit switch 26 for tip detection. Then, after the stretched processing portion 32 is exposed from the tip of the head portion 2 to the outside, it is guided to the die guide 34 and the power feeding die 36 at the tip of the lower wire guide 4, and the supporting pulley 38 and the wire collecting roller 40.
After that, the wire sensing plate 44 is collected in the wire collecting box 42 provided inside.

When the wire 8 is automatically connected, the wire 8 is unwound from the wire supply bobbin 12 in advance, and the tip of the wire 8 is set below the wire feeding roller 24.

Then, the wire feeding roller 24 is driven by a controller (not shown) to feed the wire 8 downward through the above-mentioned path and guide it to the position of the wire collecting roller 40. In addition,
By interlocking with the movement of the wire feeding roller 4, a wire 8 and a wire sensing plate 44 are provided by a voltage applying means (not shown).
And a predetermined potential difference between them and.

If you continue to drive the wire feeding roller 24,
The wire 8 that has passed through the wire recovery roller 40 contacts the wire sensing plate 44 provided on the back side of the wire recovery box 42 while inclining slightly downward.

At this time, a current flows between the wire sensing plate 44 and the wire 8, and after the current is sensed by an ammeter (not shown) connected to the wire sensing plate 44, the wire feeding roller
The driving of wire 24 is stopped, and the automatic connection of wire 8 is completed.

In addition, during the automatic connection, in order to assist the feeding of the wire 8, normally, deionized water is flowed together with the wire 8.

[Problems to be Solved by the Invention] In the conventional automatic wire connection type electric discharge machine, when the automatic wire connection is performed as described above, before the wire 8 exiting the wire collecting roller 40 reaches the wire sensing plate 44. There was a case where it was rolled and wrapped around the wire collection roller 40. In this case, the wire 8 and the wire sensing plate
Since no current flows between the wire 44 and the wire 44, the wire 8 continues to be sent. Therefore, the wire 8 is further wound around the wire collecting roller 40, and the wire collecting roller 40
Had a problem such as a failure or the wire 8 could not be used.

 The present invention aims to solve the above problems.

[Means for Solving the Problems] The present invention automatically feeds a wire from a head portion to a lower wire guide, and a wire recovery roller provided in the lower wire guide moves the wire into the lower wire guide. And an automatic wire connecting means for carrying the wire until it comes into contact with a wire sensing means provided on the wire, and an electric wire connecting type for performing electric discharge machining of a work with a wire stretched between the tip of the head part and the tip of the lower wire guide In wire electric discharge machine,
As the wire sensing means, a cover formed of an electric insulator covering the wire collecting roller and a position of the cover facing the wire discharging side of the wire collecting roller are connected to each other in the wire discharging direction. And a cylindrical sensor formed of an electric conductor for detecting an electric conduction state between the wire and the axis of the wire, and a wire sensor is disposed below the wire sensor. A wire recovery box for recovering the wire that has passed through the cylindrical sensor is provided.

[Operation] During automatic wire connection, the wire sent from the head to the lower wire guide is arranged obliquely with respect to the wire feeding direction immediately after exiting the wire collecting roller, and is a tubular sensor of the wire sensor. Abut. At this point, the automatic connection is completed, so that the automatic connection is surely performed.

Even if the wire exiting the tubular sensor rolls after the completion of automatic connection, the wire is not caught by the wire collecting roller because the wire collecting roller is covered by the cover.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. The same components as those in the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 50 is a wire sensor disposed immediately after the wire collecting roller 40 in the wire feeding direction, and a cover 52 that covers the wire collecting roller 40 in a substantially U-shape,
The cover 52 and the cylindrical sensing member 54 are connected to the wire collecting roller 40 at the position on the wire feeding side of the wire collecting roller 40.

The cover 52 is made of an electrically insulating material, and a trap 56 is formed on the U-shaped bottom portion.
The trap 56 is provided for causing the water, which is caused to flow together with the wire 8 during the automatic connection, to flow downward as shown by an arrow a.

The tubular sensing element 54 is made of a tubular electrical conductor, and the axis of the tubular sensing element 54 is inclined in the wire feeding direction. And the wire sensing plate in FIG.
Similar to 44, a predetermined potential difference is applied between the cylindrical sensing element 54 and the wire 8 during automatic connection.

When the wire detector 50 having the above-mentioned configuration is used as a wire 8 detection means during automatic connection, the wire collection roller 40
Immediately after that, the wire 8 coming out of contact with the cylindrical sensing body 54 inclined with respect to the wire feeding direction, and a current flows between the wire 8 and the cylindrical sensing body 54, at which point the automatic connection is completed. To do.

Therefore, the wire 8 exiting the wire collecting roller 40 is reliably detected by the wire detector 50, and the wire 8 is wound around the wire collecting roller 40 as in the conventional case and the wire detecting plate is detected.
There is no such thing as not touching 44, and various troubles at the time of automatic connection are solved.

Further, even when the wire 8 rolls when the wire 8 is collected in the wire collection box 42, the cover 52 prevents the wire 8 from being wound around the wire collection roller 40.

[Effects of the Invention] As described above, according to the present invention, when the wire is automatically connected, the wire exiting the wire collection roller is immediately detected by the wire sensor and then collected in the wire collection box. There is an effect that automatic wiring can be surely performed.

Further, even after the automatic connection, even if the wire exiting the wire sensor rolls, the rolled wire is not caught by the wire collecting roller, and the wire can be collected in the wire collecting box favorably.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing a conventional automatic wire-connection type wire electric discharge machine. 2 ... Head part, 4 ... Lower wire guide, 8 ... Wire, 40 ... Wire collection roller, 50 ... Wire sensor, 52
...... Cover, 54 …… Cylindrical sensor.

Claims (1)

(57) [Scope of utility model registration request] 1. A wire is automatically fed from a head portion to a lower wire guide, and a wire collecting roller provided in the lower wire guide directs the wire to a wire sensing means provided in the lower wire guide. An automatic wire-connection type wire electric discharge machine, comprising: an automatic wire-wiring unit that conveys until it abuts, wherein the wire is stretched between a tip of the head portion and a tip of the lower wire guide. As a sensing means, a cover formed of an electrically insulating material for covering the wire collecting roller is connected to a position of the cover facing the wire discharging side of the wire collecting roller, and the cover is arranged in the wire discharging direction. A wire sensor including a cylindrical sensor whose axis is inclined and which is made of an electrical conductor and which detects an electrical continuity with the wire is provided. An automatic connection type wire electric discharge machine, characterized in that a wire recovery box for recovering the wire that has passed through the tubular sensing element is provided below the wire sensor.