Laser working machine and method for maintaining laser working machine

A laser working machine comprising:

• a torch through which laser light is radiated to a workpiece;
• a first body comprising:
• one end portion on which the torch is mounted;
• another end portion provided at a position opposite to the one end portion in a direction along a first optical path;
• at least one mirror configured to reflect the laser light to guide the laser light to the torch along the first optical path;
• and
• a first slot which is provided at the another end portion;
• a second body comprising:
• a second body end portion attachable and detachable to and from the another end portion of the first body;
• a second optical path optically connected to the first optical path;
• and
• a second slot which is provided at the second body end portion;
• a first shielding plate insertable into the first slot in a sealed manner and configured to block the first optical path;
• and
• a second shielding plate insertable into the second slot in a sealed manner and configured to block the second optical path,
• wherein, when the first shielding plate is inserted into the first slot and the second shielding plate is inserted into the second slot, a space surrounded by the first shielding plate, the second shielding plate, the first body, and the second body is shielded,
• wherein one shielding plate out of the first shielding plate and the second shielding plate comprises a ventilating duct through which gas is sent to a shielded space surrounded by the first shielding plate, the second shielding plate, the first body, and the second body, and
• wherein another shielding plate out of the first shielding plate and the second shielding plate comprises a discharge duct through which the gas is discharged from the shielded space.

A method for maintaining a laser working machine, the method comprising:

• providing the laser working machine comprising a first body having a first optical path along which laser light travels and a second body provided above the first body and having a second optical path along which the laser light travels;
• removing a first light transmissive plate having a first optical path hole through which the first optical path is to pass in a state where the first light transmissive plate is inserted into a first slot of the first body and a second light transmissive plate is inserted into a second slot of the second body, the second light transmissive plate having a second optical path hole through which the second optical path is to pass;
• inserting a first shielding plate into the first slot to block the first optical path;
• removing the second light transmissive plate from the second slot;
• inserting a second shielding plate into the second slot to block the second optical path;
• separating the first body and the second body from each other for maintenance work performed on at least one of the first body and the second body;
• connecting the first body and the second body to each other in a state where the first shielding plate is inserted into the first slot and the second shielding plate is inserted into the second slot;
• sending gas through a ventilating duct of the second shielding plate to a shielded space defined between the first shielding plate and the second shielding plate to discharge the gas from the shielded space through a discharge duct of the first shielding plate;
• removing the second shielding plate from the second slot;
• inserting the second light transmissive plate into the second slot;
• removing the first shielding plate from the first slot;
• and
• inserting the first light transmissive plate into the first slot.