Ram guiding apparatus of machine tool

A ram guiding apparatus of a machine tool, the ram guiding apparatus comprising a saddle having a cross shape, as seen in a side view of a portal machine tool, provided to be freely movable in the horizontal direction along a cross beam, while the under face of a horizontal part of the cross-shaped saddle, on the rear side thereof, is opposed to the upper face of the cross beam, and the rear face of the vertical part of the cross-shaped saddle is opposed to the front face of the cross beam, respectively, a box provided on the front side of the horizontal part of the cross-shaped saddle, upper and lower faces of the box being open, a ram for fitting a working head thereto housed inside the box, a linear guide elongated in a vertical direction and incorporated between the front face of the vertical part of the cross saddle above and under the vertical part and the rear face of the ram for use in guidance in the vertical direction, said linear guide including a first linear guide and a second linear guide, arranged in parallel with each other at different horizontal positions, so as not to interfere with each other, when the ram moves in the vertical direction, wherein the ram is fitted by the first linear guide and the second linear guide while the first linear guide and the second linear guide are oriented in opposite directions so that the ram is freely movable by the first and second linear guides only in the vertical direction.