A4 paper sheet folding device for introducing paper sheet in correspondence envelope, has panels folded for marking marks in sheet to manually fold sheet into three parts for introducing sheet in cover when sheet is extracted from panels

摘要

The device has six identical rigid flaps (1-6) including a format corresponding to a fraction of A4 format and articulated by a joint i.e. folding line (7), that is placed parallel to a larger side of the flaps such that the flaps form panels with A4 format. An A4 paper sheet to be folded (8) is received between the flaps. The panels are folded for marking folding marks in the sheet to manually fold the sheet into three identical parts for introducing the sheet in a correspondence envelope with length of 110 millimeter and breadth of 220 millimeter when the sheet is extracted from the panels.