Patent ID: 6773384
Filing Date: 2004-08-10
Classification: B31B

Abstract:
A machine for treating sheets, for manufacturing packaging made from sheets of materials including cardboard or plastic, said machine comprisingdrive means having at least one drive motor and suitable for driving sheets in a drive direction through a treatment zone situated between an inlet and an outlet of the machine, treatment tooling designed to form cutouts and/or folds that are disposed transversely relative to the drive direction in said sheets, means for determining information relating to the position of a sheet in the treatment zone, and control means for controlling the treatment tooling as a function of said information, the treatment tooling being carried by at least one transverse carrier shaft rotated by a shaft motor, the drive means being driven by a main drive motor and being adapted to drive the sheets at a substantially constant drive speed between the inlet and the outlet of the machine and in said treatment zone, the shaft motor being distinct from said main motor, and the machine further comprising a control unit adapted to act as a function of said drive speed and of the information relating to the position of the sheet in the treatment zone, to control the shaft motor, in cycles comprising a waiting stage, a positioning stage in which said motor angularly positions the tooling of the transverse carrier shaft, and a treatment stage, in which for treating said sheet, the tooling is in contact with a predetermined region of the sheet and is driven at a treatment speed whose tangential component is equal to said drive speed, the carrier shaft having a cylindrical surface which is not in contact with the sheet during said waiting stage and said positioning stage.