Compact hem crimping device for hem crimping edge of metal sheet and associated hem crimping unit and hem crimping method

The invention relates to a device (20) for crimping the edges of a sheet metal. The device is used for crimping the edges of the sheet metal by folding one of the edges onto the other one of the edges. The hem crimping device comprises a support (22) and a blade holder (24) which is movable relative to the support and carries at least one hem crimping blade (26). The hem crimping device is characterized in that the hem crimping device further comprises an intermediate support (28) which is pivotably mounted on the support and on which the blade holder is mounted in a translatory manner, and in that the hem crimping device further comprises an actuating pressure cylinder (30) which is mounted in a translatory manner on the intermediate support. The actuating pressure cylinder comprises a cylinder body (25) connected to the blade body holder and a slide bar equipped with a spherical distal end facing the hem crimping blade body and configured for engagement with a resting part on a die (12) for receiving the ed