Processing machine and slide mechanism

A processing machine comprising:

• a cover body that is provided with an opening and defines a processing area in which a workpiece is processed;
• a first door that is slidable in a predetermined direction between a first position in which the opening is opened and a second position in which the opening is closed;
• a second door that is disposed to overlap with the first door inside the first door with respect to the processing area and slidable in the predetermined direction between the first position in which the opening is opened and a third position that is opposite to the first position with respect to the second position and in which third position the second door cooperates with the first door to close the opening;
• and
• a rail member that includes an engagement unit that engages with the first door so as to guide the sliding of the first door, which rail member is provided at the second door to allow the second door to be slidable with respect to the first door in the predetermined direction,
• the engagement unit being disposed outside the processing area,
• the second door including an outer surface and an inner surface separated by an internal space formed therebetween, the second door also being provided with a notch opening to the outer surface,
• the outer surface being located outside the processing area and facing the first door when the first door and the second door are in the first position,
• the inner surface being located inside the processing area,
• the rail member being accommodated in the internal space, and
• the first door engaging with the engagement unit in the internal space via the notch.