Two eccentrics 2, rigidly secured to each other, rotate about fixed axis A. The eccentrics are enclosed, one each, by two frames 4 which are rigidly secured to each other and are mounted on link 1. Link 1 has slot b which slides along fixed pin C. When eccentrics 2 rotate about axis A, the required motion is imparted to link 1 and to knife a mounted on link 1.
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