Patent ID: 6899003

Claim:
A cutting machine for cutting a flat cardboard plate having a cardboard, said cutting machine comprising: a first rotary cutter for cutting an upper portion of the flat cardboard plate; a second rotary cutter rotatable in a direction counter to a direction of rotation of the first rotary cutter for cutting a lower portion of the flat cardboard plate; a drive mechanism for driving the first and second rotary cutters relative to the flat cardboard plate along a single cutting line to cut the flat cardboard plate along such cutting line; a support table for supporting from below the flat cardboard plate, and a level adjusting mechanism for adjusting a relative position between the support table and the first and second rotary cutters in a direction up and down according to a thickness of the flat cardboard plate to be cut and for setting a boundary between respective depth of cutting by the first and second rotary cutters to a value substantially equal to one half of a thickness of the flat cardboard plate; and a retaining mechanism for pressing a portion of the flat cardboard plate on a trailing side of the cutting line with respect to a direction of feed of the flat cardboard plate against the support table by moving a retainer bar only in a vertical direction to retain the flat cardboard plate immovable during a cutting operation.