Gripper bar for gripping sheet-like material within a machine to be used for producing packages
AssigneeBobst SA
InventorsMarcel Yerly, Mauro Chiari
Life of this patent
Estimating the term…
Abstract
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.
Claims19
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.
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 shape of a resilient plate attatched at one end of the leading edge wall fo th bar and with the other end coacting with a gripper counterpart mounted ont eh trailing edge wall of the bar, said bar being connected at both ends to two lateral conveyor chains with the improvement comprising teh upper wall having a tongue extending forward from the leading edge wall, said resilient plate having a length extending the width of th bar and having a reverse bend of 180.degree. with a portion being secured on said tongue and the remaining portion extending through the interior of the bar before passing through a window on the trailing edge wall of the bar.
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 having two lateral conveyor chains, said gripper bar comprising a profile hollow bar with an upper 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 shape 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, 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 end of the bar being connected to a special link of the lateral conveyor chain by means of an appropriate fixture means including at least one fixture being provided with two fatening braces connected temporarily to the leading edge and trailing edge of the bar, both braces being designed to be able to adopt exactly the outer shape of the leading and trailing edges respectively without increasing the height of the gripper bar.
Dependencies are inferred from the claim text.