Abstract: In a method and apparatus for moving gripper bars for the advance of sheet material in a sheet-processing machine with processing stations having upper portions and lower portions, the gripper bars are cyclically advanced in an advance plane which extends between the upper and lower portions of the processing stations. The gripper bars are then returned in the same cycle in the opposite direction to the advance direction in a return plane which is displaced in respect of height with respect to the advance plane. The gripper bars are returned between the upper portions and the lower portions of the processing stations. The advance plane is not connected to the return plane. After termination of the advance movement the gripper bars are set from the advance plane to the return plane and after termination of the return movement they are set from the return plane to the advance plane.

Abstract: In a method of setting flat elements in relation to a reference device, in particular stamping dies or the like, and for aligning embossing blocks relative to an embossing original outside a stamping machine by means of a camera and picture screen associated therewith, the camera position is set over a holding frame and a marking at one side of the holding frame and displaced until the image of the camera on the picture screen is coincident with a line of a reticle, whereafter the camera is moved over a second marking, which is approximately aligned with the first marking, at the other end of the holding frame and then the rear part of the holding frame is displaced at a right angle to the first direction of travel until the image of the second marking on the picture screen is coincident with that reticle line.

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.

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.

Abstract: A punching device for automatic punching machines for the punching of paper, cardboard and the like, comprising: impulsion means for a top shoe; such as an eccentric cam drive; a stationary bottom shoe supporting a counterpunch; 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 impulsion means for the top shoe is located between the top shoe and a yoke which is connected with the bottom shoe through prestressed tie rods.