Leakproof device of wire cut machine

A leakproof device of the work tank of a wire cut machine comprising a fixed plate fastened on the work tank, and a locating plate fastened with a lower arm of the wire cut machine. The fixed plate is provided in the fringe of a hollow portion thereof with an annular slot into which the compressed air is injected to form an air wall to reduce the friction between fixed plate and movable plate, also to prevent the machining fluid leaking from the work tank.

FIELD OF THE INVENTION

The present invention relates generally to a wire cut machine, and more particularly to a leakproof device of the work tank of the wire cut machine.

BACKGROUND OF THE INVENTION

The conventional leakproof device of the work tank of the wire cut machine comprises a movable plate and a fixed plate. The movable plate is fastened with the lower arm its put through the work tank. Such a conventional leakproof device as described above is defective in design in that the movable plate and the fixed plate possibility susceptible to wear due to the mechanical friction. In light of an increase in the friction coefficient of the plates, the lower arm is apt to shake when work table moving. As a result, the precision of the wire cut machine is undermined.

FIG. 1 shows a perspective view of a wire cut discharge machine of the prior art. FIG. 2 shows a sectional view of a leakproof device for a wire cut discharge machine of the prior art with a lower arm (element 2 ), a locating plate (element A), a movable plate (element B), and a fixed plate (element C), a plurality of adjustment screws (element 35 ), and a spring (element 34 ).

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide the work tank of a wire cut machine with a leakproof device its leak-free from the drawbacks of the conventional leakproof device described above.

In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a leakproof device comprising a lower arm, a locating plate fastened with the lower arm, a fixed plate fastened on the work tank of the wire cut machine. The fixed plate is provided along the fringe of a hollow portion thereof with an annular slot its in turn provided with a gap nozzle via which the compressed air is injected into the annular slot to form an air wall. The air wall serves to reduce the mechanical friction between the fixed plate and the movable plate located between the fixed plate and the locating plate. The air wall also serves to prevent the leak of the finishing fluid contained in the work tank.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIGS. 3-5 , a leakproof device embodied in the present invention is disposed between a work tank 1 and a lower arm 2 of a wire cut machine. The lower arm 2 is provided with a locating plate A fastened therewith, and a fixed plate C fastened therewith and provided with a hollow portion 3 of an oval shape. The fixed plate C is provided with a plurality of rollers 33 fastened therewith by a plurality of adjustment screws 35 in conjunction with a spring 34 . Located between the rollers 33 is a movable plate B. When the work tank 1 is moved leftward and rightward, the fixed plate C slide on the movable plate B, the tightness between the movable plate B and the fixed plate C is adjusted by the adjustment screws 35 .

The present invention is characterized by the fixed plate C, which is provided along the fringe of the hollow portion 3 thereof with at least one annular slot 4 its in turn provided with one or more gap nozzles 41 . The annular slot 4 is provided with the compressed air injected thereinto via the gap nozzles 41 . The compressed air forms an air wall along the annular slot 4 . The air wall serves to reduce the friction between the fixed plate C and the movable plate B. In addition, the air wall serves to prevent the leak of the finishing fluid contained in the work tank 1 . A finishing fluid may be injected into the annular slot 4 to form a fluid wall in place of the air wall.

The embodiment of the present invention described above is to be regarded in all respects as being merely illustrative and not restrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scopes of the followings appended claims.