Top feed for sewing machine

In a sewing machine having at least one reciprocating stitching needle and at least one lower feed dog for engaging and disengaging the lower surface of material to be sewn to move said material along a predetermined path relative to the stroke of said needle, drive means for actuating said lower feed dog including a rotating shaft, the combination of an upper feed dog arm pivotally linked to said drive means to cause said upper feed dog to move substantially in synchronism with said lower feed dog, an actuating lever arm having an end thereof fixedly connected to said upper feed dog arm and extending toward said rotating shaft, an eccentric cam mounted upon said rotating shaft, said actuating lever arm having a cam-following surface formed thereon and in contact with said eccentric cam and means resiliently maintaining said cam-following surface in contact with said cam, the contour of said cam being such that with rotation of said rotating shaft said upper feed dog and said lower feed dog periodically engage and disengage the upper and lower surfaces of said material respectively in synchronism with reciprocating movement of said stitching needle to feed said material along said predetermined path relative to the stroke of said stitching needle.