thread another embodiment of the present invention will be explained with reference to the drawings a second embodiment has the same construction as the first embodiment as shown in fig1 and 4 however the configuration of the second cam member 24 in the second embodiment in fig3 b differs from that in the first embodiment in fig3 a in the second embodiment as shown in fig7 the first cam member 23 has a continuous displacement the second cam member 24 is displaced by almost the same amount as the first cam member 23 but its displacements are discrete in operation while the upper knife 6 cuts the edge of the fabric w in cooperation with the lower knife 7 the needle 5 sews the overedge stitch s in cooperation with the known looper when the adjustment member 20 is rotated the first and second cam members 23 and 24 operate the first and second transmission levers 25 and 27 and the lower knife holder 8 and the movable member 15 move at right angles to the fabric feed direction by almost the same amount the stitch width is thus adjusted when the edge of the fabric w is cut and overedge stitch s is sewn the fabric w held by a known presser foot assembly.