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A gripper bar fitted on drive chains and destined to grip and carry plate shaped sheets of material through printing, cutting and similar machines to produce a package characterized by the bar including a hollow profile on which the grippers are fastened. Every gripper consists of a flat spring atta

A gripper bar fitted on drive chains and destined to grip and carry plate shaped sheets of material through printing, cutting and similar machines to produce a package characterized by the bar including a hollow profile on which the grippers are fastened. Every gripper consists of a flat spring attached at one end to a leading edge wall of the bar and having the other free end taking a rest position engaging a gripper counterpart which is situated on the trailing edge of the bar. The flat spring has a length greater than the width of the bar and passes through the bar before reappearing through a window on the trailing edge of the bar.

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In a gripper bar for gripping a plate-shaped sheet to be used in printing, cutting, embossing and creasing machines for the production of packages, said gripper bar comprising a profile hollow bar with an upper wall, a lower wall, a leading edge wall and a trailing edge wall, grippers being arranged

In a gripper bar for gripping a plate-shaped sheet to be used in printing, cutting, embossing and creasing machines for the production of packages, said gripper bar comprising a profile hollow bar with an upper wall, a lower wall, a leading edge wall and a trailing edge wall, grippers being arranged at regular distance along the bar and consisting each of an upper finger with the sape of a resilient plate attached at one end to the leading edge wall of the bar and with the other end coacting with a gripper counterpart mounted on the trailing edge wall of the bar, said bar being connected at both ends to two lateral conveyor chains with the improvements comprising each resilient plate having a length exceeding the width of the bar and extending through an interior of said bar before passing through a window on the trailing edge wall of the bar, each of the resilient plates having a fastened end which is bent in such a way as to allow it to be attached against an inner surface of the leading edge wall of said bar, and opening means having an axle extending lengthwise in th gripper bar with an end of the axle extending past the end of the gripper bar, each end of the axle being provided with a gripper opening lever engageable by the machine, said axle being mounted to rotate on bearings within said gripper bar and having cams disposed on a trailing edge of the axle acting on a side of the resilient plate in an area associated adjacent to the free end of said resilient plate so that rotation of th axle causes movement of the resilient plate to an open position.