Sheet feeding or delivering – Delivering – By endless conveyor
Reexamination Certificate
2001-08-31
2003-09-30
Mackey, Patrick (Department: 3651)
Sheet feeding or delivering
Delivering
By endless conveyor
C271S204000, C271S082000, C101S419000, C101S416100
Reexamination Certificate
active
06626429
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method of setting sheet guide elements, such as guide brackets and brush wheels or pinwheels and sheet conveying elements, such as a sheet brake on sheet-processing machines.
Published, Non-Prosecuted German Patent Application No. DE 43 21 179 A1 relates to a method and a device for controlling or regulating operating processes in a printing machine. Through the use of the method proposed in this publication, the operating person is assisted in assuring quality on a printing machine. Through the use of the method proposed in this publication, the selection of a representative color measuring location by hand or automatically, as desired, is made possible, so that a regulation is ensured, the amount of rejects is considerably reduced and the effort and costs for the control or regulation of operating processes on a printing machine are reduced. Through the use of the solution proposed in this publication, coordinates for the measurement locations of an image recording device are determined from image information which reproduces at least the surface of a printed product. At each measurement location selected in such a way, the image recording device registers a measurement field with a defined prespecified size with high accuracy on the surface of the printed product. The method may be used in particular in rotary printing machines, which contain devices for handling, printing and treating sheets or other flat materials to be printed. In addition, the method disclosed by Published, Non-Prosecuted German Patent Application No. DE 43 21 179 A1 can be used to control devices which can be provided upstream or downstream of a printing machine, such as separating apparatuses, folders, cross cutters or slitters, gatherers, stacking devices, inserting devices, insertion machines, sorting machines and delivery configurations for delivering sheet or web material.
Published, Non-Prosecuted German Patent Application No. DE 42 01 480 A1 discloses a device for depositing flat material on a stack. A control device for pressure distribution of the blown-air or suction device is provided downstream of the blown-air or suction-air devices, together with an input device, so that data relating to the two-dimensional mass distribution of the printed sheet can be taken into account. Through the use of the blown-air or suction device, a pressure distribution which is correlated with the mass distribution can be produced on the deposit surface of the sheets. The device according to Published, Non-Prosecuted German Patent Application No. DE 42 01 480 A1 is used in all machines or apparatuses in which a previously printed or coated flat article, such as a sheet or the like or another sheet-like configured product can be conveyed onto a stack and deposited on the latter with the aid of grippers and a blown-air or suction device.
The aim of a stoppage-free passage of a printed sheet through one or more printing units of a printing machine processing sheet-like material is smear-free and scratch-free sheet guidance through the entire printing machine, in which the printed upper side or the already printed underside (in the case of turning) is not damaged; and this with optimal setting of the elements guiding the sheet material, such as small brush wheels or small pinwheels or sheet conveying elements assisting the sheet guidance, such as the sheet brake. This applies basically also to other sheet guiding elements as well, such as small pinwheels rotatably mounted on a stationary axis of rotation or brush wheels in the feed plane of a feeder of a rotary printing machine. In the case of multiple systems, what often occurs, for example, in the case of four-color printing on two-color machines and where the printed-image information from the color separations from the first pass can be evaluated, the optimal setting of the elements guiding the sheet material is likewise of importance.
The position settings of the elements that assist the sheet guidance through the printing units of the rotary printing machine, and therefore the paper run, are even nowadays mostly performed manually. Remotely adjustable positioning elements are still being developed. The positioning, to be performed manually, of the sheet guide elements assisting the sheet guidance through the rotary printing machine, if it is performed in a manual way, relies heavily on the judgment and experience of the operator of the rotary printing machine who carries it out. If an unpractised operator of the rotary printing machine performs such a setting, it is entirely possible that disruptions to the printed image occur as the printing material runs through the printing units provided one behind the other in a rotary printing machine. In addition to automatic adjustment, however, it may also be practical to provide the printer with the information as a setting recommendation within the context of presetting; the information can, for example, be output on the monitor and the machine operator can be given a first starting point for a setting to be performed.
In the case of conventional configurations from the prior art, the paper run depends to a great extent on the individual experience of the persons operating the printing machine.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a method of setting guide elements for a flat material along a printing-material conveying path in a rotary printing machine which overcomes the above-mentioned disadvantages of the heretofore-known methods of this general type and which uses the printed-image parameters, already known from the production of the printed original (copy preparation) before the respective current print job is printed on the multicolor rotary printing machine, to preset sheet guide elements or sheet conveying elements on the printing units of the rotary printing machine in a job-specific manner.
With the foregoing and other objects in view there is provided, in accordance with the invention, a method of setting guide elements for a flat material along a printing-material conveying path in a rotary printing machine, the method includes the steps of:
providing sheet-guiding elements in a printing-material conveying path, the sheet-guiding elements assisting in guiding a flat material;
providing sheet-conveying elements having respective actuating positions adjustable relative to the flat material, the sheet-conveying elements influencing a sheet conveyance, the sheet-guiding elements and the sheet-conveying elements assisting a passage of the flat material through a printing machine;
initially determining a job-specifically optimized actuating position for a positioning of the sheet-guiding elements and of the sheet-conveying elements by using job-specific printed-image information known from a prepress stage; and
positioning at least one of the sheet-guiding elements and the sheet-conveying elements in relation to a printed image by using the job-specifically optimized actuating position determined in the determining step.
In other words, according to the invention, the object of the invention is achieved in that, in a method of setting guide elements for a flat material for a passage through the printing-material path on multicolor rotary printing machines, guide elements assisting the guidance of the sheet material, such as small guide wheels, guide brackets, brush wheels or pinwheels, being assigned to the printing-material conveying path, and sheet conveying elements, which influence the sheet conveyance and whose respective actuating position relative to the sheet material is adjustable, being provided, the following method steps are performed: first of all, the in job-specific terms optimal actuating position is determined for the positioning of the sheet-guiding and sheet guide elements assisting the run of the flat material through the printing machine, using the job-specific printed-image information known from the prepress stage, and
using the determined optimal actuating positio
Heidelberger Druckmaschinen AG
Mackey Patrick
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