a fur sewing machine equipped with two feed discs is provided with a trimming mechanism . the trimming mechanism includes a trimming blade which is mounted for oscillatory motion close above the feed discs , and a fixed counterblade . the counterblade is secured to a blade holder which , at the same time , is used for axially fixing the feed disc which is supported on a displaceable carrier bracket . an exhaust device equipped with an injector nozzle is provided to remove the off cuts .