Unit for cutting apparatus and cutting apparatus

A unit comprising:

• a base;
• a first shaft that is attached to the base and extends along a first rotation axis;
• a plurality of holders having a cylindrical shape which are attached to the first shaft;
• a plurality of first blades having an annular shape which are respectively attached to the plurality of holders;
• a second shaft that is attached to the base and extends along a second rotation axis parallel to the first rotation axis;
• a plurality of second blades having a cylindrical shape which are attached to the second shaft;
• and
• a detection means for detecting contacts between the plurality of first blades and the plurality of second blades, wherein
• the first shaft, the second shaft, the first blades and the second blades individually have conductivity,
• the detection means comprises
• a power source,
• a first wiring electrically connecting the first shaft and the power source,
• a second wiring electrically connecting the second shaft and the power source,
• a plurality of light emitting devices respectively attached to the plurality of holders,
• a third wiring electrically connecting each of the plurality of light emitting devices and the first shaft, and
• a fourth wiring electrically connecting the plurality of light emitting devices and the plurality of first blades respectively.