| CPC A63F 3/068 (2013.01) | 20 Claims |

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1. A method for adjusting a pressure profile exerted on input media by a scratching assembly, the method comprising:
rotating a pin of an adjustment mechanism;
wherein the adjustment mechanism is configured so that rotation of the pin causes a threaded end of the pin to thread into or out from a threaded hole of a mounting block connected to an end of a roller, such that rotation of the pin causes a corresponding vertical motion of the mounting block and results in a vertical adjustment of the end of the roller, the vertical adjustment adjusting a pressure profile exerted by the roller on the input media.
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