dog 12 comes at its end portion to a position of f 3 shown with the solid line with respect to the positions shown with the solid line of the above mentioned members the pins 18 and 10 are biased clockwise by the angle u03b8 3 around of the rocking shaft 4 when each of the members is at the zero position under such a condition that the second cam 34 is further rotated and the pin 40 is positioned at the position 0 shown with the two dotted line the component t 3 in the horizontal direction of the pin 10 with respect to the angle u03b8 1 is equal to a distance s 3 between the end portions f 0 and f 3 of the feed dog 12 the second cam 34 is further rotated from the condition of fig5 and when the feed fork 16 is turned down to the maximum low position as shown in fig6 by the second cam 34 the pin 40 comes to the position of the solid line and at the same time the pins 18 10 come to the position of the solid line and the feed dog 12 comes to the position of f 4 at its end portion in this embodiment the second cam 34 is composed such that the positions shown with the solid line of the members agree to the zero positions of these members and that the radius r 2 of the large diameter side is equal to the radius r 1 of the large diameter side of the first cam 32 therefore the feed starting position f 3 of the second feeding.