Process for sharpening the knives of a rotating drum and adjusting the fixed counter-knife cooperating therewith and device for carrying out this process

A fodder havesting machine comprising a rotating chopping drum having a plurality of knives, a fixed counter-knife cooperable with said knives of said drum, and a retractable wheel adapted to be moved in rotation to sharpen said knives periodically, said counter-knife comprising stops,

• said machine further comprising at least two aligned positioners each having an end contact piece, said positioners being located near the free ends of said chopping drum mounted to pivot about the geometrical axis of said chopping drum and connected to an actuating device for bringing, by pivoting, said contact piece of each of said positioners, either opposite said retractable wheel in order to be ground to the same diameter as said knives are sharpened thereby, or opposite a corresponding stop of said counter-knife, which is fastened to a fixed support via, on the one hand, a presser device tending to apply its stops against said contact pieces of said positioners and, on the other hand, a fixing device.