Method and apparatus for inserting a cover sheet between a transparent film and a book-like case

A method for inserting a cover sheet between a transparent protective film and a book-like container, externally wrapped within the same film, said container being substantially formed by a pair of closure members (4a, 4b) hinged to each other along a corresponding hinge edge (4c) and externally wrapped within said protective film (3), said protective film being fastened to said closure members (4a, 4b) on edges opposite to the hinge edge (4c), including:

• opening the container (4) by opening said closure members (4a, 4b) by an angle wider than 180° with respect to a close configuration of the closure members (4a, 4b);
• detaching the transparent film (3) from the outer surface of said closure members (4a, 4b);
• making a transversal corrugation in a cover sheet (2) situated beside said opened container (4), near an area (Z) delimited by said opened closure members (4a, 4b) and the detached film (3);
• introducing said corrugated cover sheet (2), into said area (Z);
• defining a flattened configuration of the closure members (4a, 4b) so that said cover sheet (2) spreads over a plane;
• the method being characterized in that the step in which the cover sheet is introduced into said area (Z) is preformed by introducing gripping means (10), situated on a side opposite with respect to said corrugated cover sheet (2), into said area (Z) and gripping said corrugated cover sheet (2), followed by pulling the cover sheet, by said gripping means (10), into said area (Z), where said cover sheet (2) is released and consequently spread across said area (Z).