Device and method for replacing stage roll unit

A method in a cardboard sheet manufacturing apparatus,

• the cardboard sheet manufacturing apparatus comprising:
• a single facer on which a first corrugating roll unit is mounted,
• a corrugating roll unit transporting carriage on which a second corrugating roll unit is mounted, and
• a corrugating roll unit replacing apparatus moveable in a replacement direction between the single facer and the corrugating roll unit transporting carriage and replacing the first corrugating roll unit with the second corrugating roll unit,
• the method comprising:
• connecting, by a connector, a replacement carriage at a retreat position in a retreat space to the first corrugating roll unit,
• wherein
• the corrugating roll unit transporting carriage is configured to shift to a position in the replacement direction towards the single facer,
• the single facer, on which the first corrugating roll unit is mounted, is on one side of the corrugating roll unit transporting carriage, on which the second corrugating roll unit is mounted, the replacement direction,
• the corrugating roll unit transporting carriage, on which the second corrugating roll unit is mounted, is on an other side of the single facer, on which the first corrugating roll unit is mounted, in a direction opposite to the replacement direction,
• the corrugating roll unit transporting carriage comprising a mounting base and a first guide rail disposed on the mounting base, the first guide rail extending in the replacement direction
• the corrugating roll unit replacing apparatus comprising a second guide rail connected in series to the first guide rail of the corrugating roll unit transporting carriage,
• the retreat space is on the one side of the corrugating roll unit transporting carriage in the replacement direction, the replacement carriage being disposed in the retreat space during operation of the single facer,
• a connection space is on the other side of the single facer in the direction opposite to the replacement direction, the replacement carriage being disposed in the connection space for replacement of the first corrugating roll unit with the second corrugating roll unit,
• the replacement carriage is located on the one side of the corrugating roll unit transporting carriage in the replacement direction, and
• the replacement carriage is supported to be moveable along the first guide rail in the replacement direction between the retreat space and the connection space;
• removing the corrugating roll unit from the single facer by moving, by a carriage driver configured to move the replacement carriage in the replacement direction, the replacement carriage along a direction of removing the first corrugating roll unit to the connection space;
• releasing a connection between the replacement carriage and the removed first corrugating roll unit;
• connecting the replacement carriage and a further corrugating roll unit mounted on the corrugating roll unit transporting carriage;
• mounting the further corrugating roll unit to the single facer by moving the replacement carriage along a direction of mounting the further corrugating roll unit toward the single facer;
• and
• releasing a connection between the replacement carriage and the mounted second corrugating roll unit and moving the replacement carriage to the retreat position, wherein
• the replacement carriage is located on the one side of the replacement direction with respect to the carriage driver.