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:
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 method for synchronizing the motion sequences of at least one main pile and at least one auxiliary pile in a feeder or delivery device of a printing material processing machine (20) having the following features: a drive (7) for moving the main pile (4) and a main pile controller (12) associated with the drive (7), an additional drive (11) for moving the auxiliary pile (9) and an auxiliary pile controller (13) associated with the additional drive (11). The auxiliary pile controller (13) receives from main pile controller (12) or from a further, higher-level machine controller (14) a start signal to move the auxiliary pile (9), the start signal simultaneously initiating a movement of the main pile (4). A related device is provided.
Abstract:
A device for fixing the position of a sheet includes a feeding table for transporting the sheet; at least one front lay disposed in vicinity of the feeding table and, in a working position, protruding upwardly beyond the plane of the feeding table; a swivellable holder to which the front lay and an adjusting device for the front lay are secured; and a adjusting device secured to the holder, the front lay and the adjusting device being disposed separated from one another on the holder, the front lay being in continuous biasing engagement, under tension, with the adjusting device, so that, by changing the position of the holder, the front lay and the adjusting device are movable from the working position into a neutral position and, conversely, from the neutral position into the working position.
Abstract:
A method and device for aligning stacked or piled sheets in a feeder of a sheet-processing machine, wherein a sheet to be separated is pivotable about a vertical axis extending at least approximately orthogonally to a transport direction of the sheet, as viewed in the transport direction thereof, in order to correct a skewed position of a leading edge thereof relative to at least one front lay. The method further includes determining, relative to the front lay, a skewed position of sheets oncoming at the front lay or resting at the top of the sheet pile, and displacing, transversely or approximately transversely to the transport direction, either the sheet pile, before the sheet is lifted therefrom, or the sheet lifted off the sheet pile, depending upon the determined skewed position, over a displacement distance that is of such length that, after the skewed-position correction, there is a defined spaced distance between a side edge of the sheet and at least one side lay.
Abstract:
According to one exemplary embodiment of the present invention, a method for sensing the position of an edge of a stock being feed to a printing press is provided. The method includes the steps of providing a light source, utilizing the light source to illuminate with planar radiation a preselected area of the stock, and a preselected area adjacent to the stock, and further providing a retro-reflecting surface on at least a portion of the preselected area adjacent to the stock illuminated by the light source. According to a feature of the present invention, a measuring device is provided and utilized to measure radiation reflected by the retro-reflecting surface.
Abstract:
A machine for processing flat printing material, in particular a sheet processing rotary printing press, includes at least one processing station in the form of a printing unit, a feeder for loading the processing station with sheets of the printing material, a delivery for combining the processed sheets into piles, and an auxiliary pile carrier displaceable in an insertion direction from a standby position into an operational position and vice versa. Supporting members follow one another in the insertion direction and axially parallel swivel joints articulatingly connect the supporting members directly to one another. The supporting members have extensions projecting beyond the swivel joints thereof. One of the extensions directed counter to the insertion direction of a respective one of the supporting members engages underneath one of the extensions directed in the insertion direction of the respective supporting member after the next which trails in the insertion direction.
Abstract:
An apparatus for picking up an auxiliary pile during a renewal of a main sheet pile when feeding sheets to a printing machine. The apparatus has loadbearing elements arranged on a holder for the auxiliary pile, and a positioning device for the loadbearing elements under the auxiliary pile. The loadbearing elements are flexible with respect to positioning forces acting from outside.
Abstract:
An apparatus for picking up an auxiliary stack when conveying sheets in a printing machine that makes it possible to reduce constraining forces when guiding loadbearing elements. The apparatus has loadbearing elements disposed on a crossmember for the auxiliary stack, the loadbearing elements being fastened to the crossmember so as to pivot in at least two degrees of freedom.
Abstract:
According to one exemplary embodiment of the present invention, a method for sensing the position of an edge of a stock being feed to a printing press is provided. The method includes the steps of providing a light source, utilizing the light source to illuminate with planar radiation a preselected area of the stock, and a preselected area adjacent to the stock, and further providing a retro-reflecting surface on at least a portion of the preselected area adjacent to the stock illuminated by the light source. According to a feature of the present invention, a measuring device is provided and utilized to measure radiation reflected by the retro-reflecting surface.