the invention provides method and apparatus for forming upper stops of a concealed type slide fastener . a concealed type slide fastener comprises a pair of fastener stringers each consisting of a fastener tape having a turn - up along one side thereof and fastener elements of thermoplastic resin secured to the turn - up . portions of the elements are fused to form upper stops . in the method and apparatus of the invention , a pair of spaced projections are formed on a base and placed with respect to fastener stringers of a slide fastener or continuous fastener chain so that the projections pass between the stringers . the fastener elements are urged toward the projections while portions of the projections engage the arrest the element - mounting - side margins of the tapes to expose the interengaging heads of the elements so that only the interengaging heads are fused .