DEVICE FOR DOUBLE FOLDING OF SHEETS Russian patent published in 2020 - IPC B42C5/00 

FIELD: printing equipment.

SUBSTANCE: invention relates to the field of printing industry and can be used for making books for photographs, magazines, and so forth with photographs and illustrations, which extend over the entire width of the open book. Disclosed is device (1) for double folding of sheets, characterized in that it is equipped with two conveyor belts (2), which are located close to each other so that sheets (5) can be clamped between conveyor belts (2) except for strip (6), which projects between conveyor belts (2), wherein conveyor belts (2) are aligned relative to each other along side of strip (6). Device is also equipped with two or more bending elements (7, 8) along conveyor belts (2), which can bend said strip (6), device (1) is configured to direct sheets (5) so that their strip (6) was located in close proximity to bending elements (7, 8), by driving conveyor belts (2), wherein at least one bending member (7, 8) bends strip (6) in one direction and at least one bending member (7, 8) bends strip (6) in the other direction.

EFFECT: technical result is the production of sheets, in which the strip of sheets has been twice bent along the same line, as a result of which these sheets can be used for books or folders for files, sheets of which are well opened.

17 cl, 9 dwg