Punching devices
AssigneeBobst SA
InventorsAlbert Halff, Manfred Vossen
Life of this patent
Estimating the term…
Abstract
A punching device for automatic punching machines for the punching of paper, cardboard and the like, comprising: a driving mechanism for a top shoe; such as a rocking lever drive, elliptical cam drive, or wedge-form transmission; a stationary bottom shoe supporting a counter-punch; a movable top shoe supporting punch knives; and a gripper bar arrangement for intermittent forwarding through the punching device of sheets to be punched wherein the drive mechanism for the top shoe is located between the top shoe and a yoke which is connected with the bottom shoe through prestressed tie rods.
Claims5
A punching device for automatic punching machines for the punching of sheet material, comprising a bottom shoe and a top shoe, wherein one shoe supports punch knives and the other shoe supports a counter punch, said bottom shoe being stationary and said top shoe being movable to and fro normal to the plane of the counter punch, drive means for moving said top shoe comprising a wedge-forming transmission activated by a rotating elliptical cam plate, said drive means located between said top shoe and a yoke which is connected with said bottom shoe through prestressed tie rods, and a gripper bar arrangement for intermittent forwarding of said sheet material between said bottom and top shoes for punching.
Dependencies are inferred from the claim text.