The basic structure of fabric feed-in combinations is composed of fabric feed-in frame, expanding centering device, padder, speed synchronizing device and photoelectric weft straightening device (optional). The effect of these combinations is fabrics, afte「expanded centered under low tension, passed padder and extruded water, added auxiliaries, and through speed synchronizing device precisely controlled its tension between padder and photoelectric weft straightening device (photoelectric weft straightening device can effectively correct deformation, weft arcs and skews from previous processing steps), meet all kinds of process requirements before pinning.