between platform 60 and rotatable foot 32 to also be forceably rotated a controlled amount depending upon the initial position of platform 60 at the start of the incremental feed stroke walking foot 32 therefore preferably constitutes a rotatable bearing member which will readily rotate with platform 60 with minimum rotational drag the fairly large surface area of table 18 enables the stock to be held in a generally planar condition for minimum resistance to its rotation in incremental amounts with each advance of platform 60 at the end of this stitch forming stroke restraining foot 38 lowers to grip the material s against table 18 followed by vertical withdrawal of stitching needle 26 and raising of walking foot 32 the stitching needle and walking foot then are oscillated back to the initial position for taking another bite on the material during this return movement spring 68 will tend to rotate platform 60 about its central pivot point which is also coincident with the stitching needle whether or not platform 60 pivots under the bias of spring 68 and the amount of its pivoting is determined by the engagement of edge sensing pin 63 on the edge of the stock s being stitched the pin is radially offset a small amount from the axis of the needle so that rotation of platform 60 causes pin 63 to move through an arc platform 60 will rotate under the bias of spring 68 until.