Travelling wire EDM apparatus provided with a wire support arm passed through the wall of a machining fluid tank

摘要

A travelling wire EDM apparatus having a pair of support and guide arms for an electrode wire effecting a cut on an electrode workpiece mounted in a tank filled with machining liquid fluid and capable of being displaced along two directions, relative to the support and guide arms, by a cross-slide table. At least the lower arm passes through an opening in one of the walls of the tank, such wall being formed by two parallel panels, a plate being slidably mounted between the two panels and having a tubular member through which the arm is disposed. Flexible joints are mounted between the plate and the two panels and at least one annular seal provides a sliding leakproof connection between the interior of the tubular member and the arm. The sealing structure of the invention permits to pass an electrode wire guide and support arm through the wall of the machining fluid tank without the use of boots and it allows a wide amplitude of relative displacement between the electrode wire support and guide arms and the workpiece mounted in the machining fluid tank.