Title: Material positioning apparatus

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Abstract: The apparatus for aligning two plys of limp material being fed into a work station employs a pair of bi-directional motor driven belts operating in electrical circuit relationship with closed loop servo control and a pair of photo-diodes with light source sensing beams employed in retro-reflective configuration for generation of a bi-polar signal in response to the movement of the belts. A pair of pressure plates mounted in proximity to said belts, provide a nip between the belts and the plates for material gripping. The belts being movable in response to dark/light bi-polar signals generated by the presence or absence of material at the center line of each of said photo-diodes and the closed loop servo control is actuated to govern the movement of said belts with respect to any deviation from said center lines. A pair of rate detector wheels are disposed in the line of travel of said plys of material and are in electrical circuit relation with a digital position servo motor to permit adjustment of the relative opposing force of each of the pressure plates in response to information imparted by the rate detector wheels into a differential computer operating in subtract mode and acting upon said servo motor through a controller.


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