56 in the arrangement shown the posts 57 are secured to the platform 54 while the wheels 55 are rotatably mounted on a base 58 fixedly carrying spring plate 59 the plate 59 has apertures passing posts 57 and operates to transmit the force of the springs 56 to the wheels 55 the spring tension can be adjusted by nuts 60 or by adjusting the length of the piston rod 51a at the clevis nut 51b as can be seen from fig2 and 3 the guide wheels 55 are rotatable about horizontal axes that are at an angle u03b8 with the perpendicular to the longitudinal direction of sewing and fabric movement the angle u03b8 may be adjusted by pivoting the support shafts 55a in the clamp mounts 55b to provide an optimum bias on the fabric tending to feed it into the edge turning guide in an even positive fashion immediately upon movement of the guide assembly into the down position described above the sewing foot 11 is lowered and sewing is started as the fabric and chain is sewn together and is fed through the sewing station by the sewing dog 66 the sewn material advances toward the puller jaws 70 while various.