A machine for applying a stiffening thermoplastic layer has a zone determined of a boot upper

摘要

A machine for stiffening and forming a selected area of flexible sheet material, for instance an end portion of a shoe upper, comprises work support mechanism including a universal female preformer having work-accommodating dihedral surfaces, an applicator for depositing on a portion of the selected area a predetermined volume of molten resin substantially in proportion to that area, and a presser complemental to the cavity defined by said surfaces and relatively movable into and out of cooperative work-pressing relation with respect to the work support to spread the molten resin and impart appropriate thickness gradient thereto throughout the selected area whereby, upon cooling, it is formed three-dimensionally and stiffened a desired degree in different portions. For forming-in-place end portions subsequently to be lasted, such as backparts of shoe uppers, pincers suitably control spreading and tensioning of the work and then relatively move with respect to the applicator to partially distribute the resin extruded in parallel arrangement within the area prior to shut-off of resin flow directed at an angle on the order of about 45 DEG to the area. Thereupon, the applicator being retracted, the molten resin is fully distributed throughout the selected area by mechanism closing the dihedral surfaces normal to the adjacent presser thus avoiding wrinkling and/or scuffing of the shoe upper and disturbing the distribution, in thickness and laterally, of the still molten resin.