Sheet material cutting apparatus

A supporting member for a sheet material cutting apparatus, said supporting member comprising:

• a housing adapted to move along a frame of the sheet material cutting apparatus, the housing including a first roller housing hole having a first wall opposite a second wall;
• a first cutting blade set provided on said housing and including a first fixed blade secured to the housing and a first rotary blade supported on the housing proximate the first fixed blade;
• a first spring member that urges the first rotary blade toward the first fixed blade;
• and
• a first positioning device including a first rotation mechanism that moves the first rotor blade into a cutting position and a non-cutting position, the first rotation mechanism having a first roller disposed in the first roller housing hole and configured so as to engage both the frame and the first rotary blade,
• wherein the first roller is movable within the first roller housing hole between a position proximate the first wall and a position proximate the second wall when the housing moves along the frame in a first direction and a second direction, respectively, the first roller housing hole being configured such that, when the first roller is at the position proximate the first wall, the first roller is disposed at a rearward position of the first rotary blade where the first roller moves the first rotary blade into the cutting position and, when the first roller is at the position proximate the second wall, the first roller is disposed at a center position of the first rotary blade where the first roller moves the first rotary blade into the non-cutting position, and
• wherein the first roller is arranged such that movement of the housing along the frame in the first direction and the second direction will cause rotation of the first roller, which causes rotation of the first rotary blade.