between the light source and the two sensor heads and operates in the conventional manner the position of the wheel 96 can be physically adjusted by loosening a screw 100 that is carried within an elongated slot 102 provided in a bracket 104 the screw extends into a horizontal supporting plate 106 which is in turn carried on top of support block 108 as can be seen in fig4 the support block 108 is in turn hinged adjacent its lower end through a hinge 110 to a fold forming plate 112 the fold forming plate 112 has a vertically extending flange 114 that is in turn fixed to a vertical shaft 116 as shown in fig3 that is in turn carried on a slidable tubular member 118 the slidable tubular member 118 is carried on a square horizontally extending tubular member 120 as a result the horizontal or lateral position of the entire edge folding and positioning station c can be adjusted a spring loaded screw 122 extends between the support block 108 and the vertical flange member 114 for applying a predetermined pressure through the wheel to the cloth during its guiding operation as can be seen in fig4 the entire wheel assembly including the wheel 96 and the motor 98 can be pivoted slightly about the hinge 110 for controlling the pressure asserted on.