Abstract: A guide apparatus for guiding sheets to a sheet-processing machine, in particular a printing machine, and a method of operating the guide apparatus are described. The guide apparatus has at least one guide element which is disposed above a feed table and whose distance from the feed table can be set with the aid of a height-adjusting device. The guide apparatus is distinguished by the fact that the height-adjusting device has a first drive and a second drive, which can be actuated independently of each other.

Abstract: In an apparatus for clamping and releasing a gearwheel rim with respect to a main gearwheel that bears the gearwheel rim, a clamping apparatus includes an axially guided, displaceable clamping plate clamping the gearwheel rim between the plate and the main gearwheel. Antifatigue bolts are used for such a purpose. The bolts are expanded by an actuator for releasing the clamped gearwheel rim to an extent that cancels the clamping action.

Abstract: A machine for processing sheets of printing material has a cylinder for transporting the sheets and sheet supports which are mounted such that they can be rotated about a sheet support axis of rotation and in each case contain supporting segments for pressing the sheets onto the cylinder. The supporting segments are mounted such that they can be pivoted as desired into an active position and into a passive position about pivot axes that are skewed relative to the sheet support axis of rotation or about rotary joints determining the pivot axes.

Abstract: A device for conveying a sheet through a printing machine includes a cylinder, formed with a channel wherein grippers are disposed for holding the sheet at a leading edge, a chain conveyor with grippers fixed to endless chains for holding and picking up the sheet at its leading edge from the cylinder and for holding the sheet at its trailing edge, and rotating sprockets carrying the chains. An actuating device is provided for opening and closing the grippers, and a drive is provided for the cylinder and the sprockets. Gripper pads and gripper tips for the trailing-edge grippers, in opened condition of the grippers, are able to run past the cylinder. The gripper pads and tips lie underneath a path described by the sheet. The trailing-edge grippers are closable in a rotational angle region wherein the chains run off the sprockets for the cylinder.

Abstract: An apparatus for conveying sheets from a printing machine to a stack has highly rigid gripper bars that can be produced with relatively little expense, and the gripper assembly permits great flexibility in the use of the apparatus. The apparatus has at least one gripper bar carrying one or more grippers which, during the conveyance, holds a sheet at its edge between a gripper finger and a gripper pad. Endless chains move the gripper bar on a path between a cylinder belonging to the machine and the stack. An actuating mechanism opens and closes the gripper as a sheet is picked up from the cylinder and as it is allowed to fall onto the stack. In the opened state, the gripper finger is located below a path described by the upper edge of the gripper pad.

Abstract: A machine for processing printing material sheets has a signal generator for position monitoring and a sheet delivery. The sheet delivery has a first conveying device, for example with a holding crossmember, for leading sheet ends and a second conveying device, for example with a holding crossmember, for trailing sheet ends. The signal generator is disposed in the sheet delivery.

Abstract: A sheet delivery for a press has a linear guide in which a single holding crossmember (e.g., a gripper bar) is mounted such that it can be moved to and fro periodically. The holding crossmember is mounted in a further linear guide such that it can be moved to and fro periodically along the further linear guide axis as well. The axes of the linear guides are aligned at an angle to each other.

Abstract: A printing unit for a machine for processing flat printing materials includes a feeding cylinder for loading the printing unit with the printing materials in a processing direction, and a device for removing particles adhering to the surface of the printing materials, the particle-removing device further including a blowing device for separating the particles from the printing materials without contact, and a suction device for discharging the separated particles, both the blowing device and the suction device being formed by blowing and suction chambers arranged within the feeding cylinder and having a fluidic connection to surroundings of a jacket surface of the feeding cylinder; a machine including the printing unit; and a feeding drum or cylinder of the printing unit.

Abstract: In a method and an apparatus for feeding sheets to a sheet-processing machine, the leading edge of the sheet is smoothed before the grippers are closed by further transport into the sheet-processing machine. A curvature or bend in the sheet transport direction is imparted to the sheet. The feed table has, in its feeder region, a curvature in the sheet transport direction, against which curvature the sheet leading edge is laid with the aid of pneumatic or mechanical devices.

Abstract: A sheet-processing machine, such as a rotary press, has normally closed grippers that circulate during operation. The grippers transport the sheets along a conveying section and guide the sheets at their leading and trailing edges. The conveying section is assigned a sheet decurler and a sheet guide device that follows the latter in the conveying direction. The conveying section further has a gripper opener assigned thereto for opening the trailing edge grippers carrying the trailing edges of the sheets in order to decurl the sheets. After the sheets have traversed the decurler and decurling has been carried out, the trailing edges are once more grasped with the trailing edge grippers for renewed positive guidance.

Abstract: A sheet-processing machine contains at least one processing station in the form of a printing unit, and a delivery with an endless conveyor and after-grippers that are guided by a mechanism connected to a drive. The after-grippers take over the processed sheets from the endless conveyor and release them over a stack. The sheet-processing machine provides for it to be possible for the mechanism to be set to positions that are correlated with different formats of the processed sheets, and for the drive that actuates the mechanism to keep the mechanism at one and the same phase angle with respect to the printing unit in each of the positions. Therefore, even in the event of different formats of the processed sheets, user-friendly placing of the stack is possible.

Abstract: A device for aligning sheets on a feeder of a sheet-processing machine includes a plurality of pivotably disposed front lays and a plurality of pivotably disposed top lays, the top lays being vertically adjustable. The front lays and the top lays are respectively assigned to and combined with one another and have a common pivoting drive. A push rod vertically adjusts the top lays, and a wedge-like slide actuates the push rod.

Abstract: In a multiple-sheet monitoring device for sheet-processing machines, provision is made to arrange a number of sensing elements spaced apart from one another over the format width of the sheets to be conveyed or the sheet stream to be conveyed, and in this case all the sensing elements interact with the same switching element in order to stop the sheet-processing machine.

Abstract: A device for aligning sheets on a feeder of a sheet-processing machine includes a plurality of pivotably disposed front lays and a plurality of pivotably disposed top lays, the top lays being vertically adjustable. The front lays and the top lays are respectively assigned to and combined with one another and have a common pivoting drive. A push rod vertically adjusts the top lays, and a wedge-like slide actuates the push rod.

Abstract: A device for conveying an imbricated stream of sheets from a sheet pile to a sheet-processing machine includes a conveying table provided with at least one revolvingly drivable, air-permeable conveyor belt. The belt has a top strand with an underside slidable over the conveying table, and a plurality of suction chambers arranged behind one another for subjecting the conveyor belt to negative pressure, so that the conveyed sheets are retained on the conveyor belt until they are transferrable to the sheet-processing machine. It further includes a common negative-pressure supply provided for negative-pressure activation of all of the suction chambers, and at least one throttle via which the suction chambers, respectively, are pneumatically connected to the common negative-pressure supply.

Abstract: A printing unit for a machine for processing flat printing materials includes a feeding cylinder for loading the printing unit with the printing materials in a processing direction, and a device for removing particles adhering to the surface of the printing materials, the particle-removing device further including a blowing device for separating the particles from the printing materials without contact, and a suction device for discharging the separated particles, both the blowing device and the suction device being formed by blowing and suction chambers arranged within the feeding cylinder and having a fluidic connection to surroundings of a jacket surface of the feeding cylinder; a machine including the printing unit; and a feeding drum or cylinder of the printing unit.

Abstract: A device for laterally aligning a sheet on a feeding table of a sheet-processing machine, wherein a sheet is moved transversely to the sheet-transporting direction by a pulling device, and a multiple-sheet monitoring device activatable during the pulling operation is assigned to the pulling device, includes another pulling device disposed opposite the first-mentioned pulling device, and a pressure-exerting roller with multiple-sheet monitoring assigned to each of the pulling devices, respectively, for sheet stabilization.

Abstract: A device for aligning sheets laterally on a feed table of a sheet-processing machine, having a side stop, includes a suction pull nozzle movable transversely to a sheet transport direction and being formed with a plurality of suction openings, the suction openings being distributed so that the number of suction openings arranged in the sheet transport direction becomes greater in a transverse direction towards the side stop.

Abstract: An assembly of at least one stop for a sheet pile edge in a sheet-processing machine, the stop being constructed as a rotatably mounted, adjustable-format roller, comprising a vertically pivotable link whereon the roller is disposed so as to be adjustable in height.

Abstract: A method of controlling negative-pressure level of a lateral pulling device for laterally aligning sheets through the intermediary of a rotary valve, includes having, during an accelerating phase of the lateral pulling device, a high-level negative pressure at a suction pull bar of the lateral pulling device; upon reaching a maximum and constant speed of the suction pull bar, a medium-level negative pressure at the suction pull bar; and, after reaching a desired pulling path of the suction pull bar, up to an end position of the suction pull bar, a low-level negative pressure and no negative pressure, respectively, at the suction pull bar; and a device for performing the method.