In a vacuum chamber, the edge of each blade group is subjected to an ion beam treatment under predetermined conditions using a plasma ion gun and argon as a medium, and is subjected to a plasma ion implantation of nitrogen plasma under predetermined conditions using a plasma ion implantation gun. When all light channels between two nodes in the network are loaded with transmission jobs, a transmission traffic congestion is created. By representing yarn as a sequence of identical but rotated cross-sections, the lumislice can effectively propagate local microstructure over arbitrary stitch patterns and knitwear shapes. The controller transmits signals to at least reduce the speed of the motor when a bag count limit is reached for a respective denomination. The restriction on design is reduced on the appearance for covering the lens barrel unit of the camera, and a camera exterior portion can be made of metal.