Abstract: An assembling device for fabric layers of simple construction providing two plates connected to each other, one of which carries a plurality of needles and the other of which has a series of corresponding holes. The two plates may be brought near to each other, so that the needles jut out from the holes for transfixing the fabric layers, and may be removed so that the plate with the holes slips off the fabric layers from the needles. A locking mechanism is provided with locks, in an unlockable way, the two plates in their approached position.

Abstract: Automatic size changer on an automatic sewing unit comprising a sewing machine, a clamp set formed at least by two half-clamps, a loader set formed at least by two half-plates for loading the pieces to be sewn in the clamp set, one of the half-clamps and one of the half-plates being mobile for handling various sizes, a motor for moving the mobile clamp and plate and sensor means cooperatable with the mobile half-plate for determining the size of the pieces to be sewn, the sensor means comprising a first pair for determining the tolerance field of the selected size.