A laser printer is equipped with first to fourth motors, and controls independently first to fourth driving portions, respectively. The interrupt controller includes an interrupt mask register that receives, and stores an interrupt onoff instruction from a CPU. The additive material can be applied as a coating formulation in an off-line manner to a continuous paper sheet web that is later used for cigarette manufacture. The cam follower axis is oriented at an angle \u03b1 with respect to the transverse direction for removing play between the wheels and the cam surface and preventing of jamming.