EP2006110A2 - Method for excluding at least one corrupted sheet from further processing intended for uncorrupted sheets - Google Patents

Abstract

The method involves identifying at least one sheet in a stack of printed sheets in a printer using a device for applying or inserting identifiers to or into the sheet stack that can be externally detected, whereby one form of the identifier indicates a single fault and another a sequence of faults.

Description

The invention relates to a method for excluding at least one faulty sheet from a further processing provided for a defect-free sheet according to the preamble of claim 1.

By the WO 96/07609 A2 and the WO 2002/14197 A2 In each case a Streifeneinschussgerät for introducing a strip in a printed sheet existing stack known.

By the DE 30 34 212 A1 a sheet stack marking device for a rotary printing machine is known, wherein by using different markers, preferably colored strips, which are introduced by different, each of a sensor signal activatable marking devices in a stack printed sheet, on the stacked sheet error identification is possible, wherein as identifiable errors a misprint or an overshoot of an applied sheet as well as a passer difference or a chromatic aberration concerning the printed image are mentioned.

By the US 4,627,380 A. is a multiple marking heads having marking device known which at least one lateral edge of a z. B. continuously produced in a paper machine, z. As paper consisting of paper, this sheet moves in the direction of its length and longitudinal slitting in several, z. B. is divided into three partial webs, wherein in the case of detected with a sensor on one of the partial webs defect such. B. a hole or an irregularity produced by the longitudinal section lateral edge of the relevant partial web is colored with one of the marking heads.

Of the US 3,375,744 A is a method can be removed in which a continuous material web, for. B. paper web, is checked with an inspection system for accuracy, wherein the web is cut into a stream of successive sheets, wherein a detected as faulty sheet is discharged from the moving stream of sheets, whereby an inertia of the ejecting device as faulty recognized bow is ejected along with a sequence of flawless bow. The individual sheets can z. B. be used for the production of photographic prints.

By the US 3,138,048 A It is known to divide a web into a stream of successive sheets and to sort out individual faulty sheets on a lock, the lock triggered by a faulty sheet identifying signal for a preset, a dead time of the lock corresponding period ausschleust out, wherein the arc recognized as defective is ejected from the stream of successive sheets together with preceding and succeeding sheets.

By the GB 2 109 775 A there is known a strip shooter moving sideways during stacking of sheets along this stack, which by its sideways movement avoids a strip to be introduced into the stack after a few sheets being deposited covering another previously introduced strip, this strip inserter using to mark certain counted quantities of sheets becomes.

By the DE 196 53 403 C2 is known, one of a arranged in a sheet-processing machine longitudinal cutting device in two or more partial arc cut sheet on by means of an inspection device Selectable stacks to make sorted stacks with "good" and rejects.

The invention has for its object to provide a method for excluding at least one faulty sheet from a planned for a fault-free sheet processing.

The object is achieved by the features of claim 1.

The advantages achieved by the invention are, in particular, that in a stack of sheets printed in a printing machine individual faulty sheets or areas with multiple faulty sheets can be identified quickly and reliably, so that faulty sheets are sorted out before further processing of the filed in the stack sheet can.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

ein Diagramm mit einem Einzelfehler innerhalb einer Arbeitsperiode eines Einschießgerätes;

Fig. 2

ein Diagramm mit einem Wiederholfehler innerhalb einer Arbeitsperiode des Einschießgerätes;

Fig. 3

ein Diagramm mit einem Wiederholfehler innerhalb mehrerer aufeinanderfolgender Arbeitsperioden des Einschießgerätes;

Fig. 4

ein Diagramm mit einem am Ende einer Arbeitsperiode des Einschießgerätes fortdauernden Dauerfehler;

Fig. 5

einen Ausschnitt aus einer Druckmaschine mit einem an deren Auslage angeordneten Einschießgerät;

Fig. 6

eine Schnittdarstellung des in der in der Fig. 5 gezeigten Auslage vorgesehenen Stapels mit einem darin eingeschossenen Streifen;

Fig. 7

einen Ausschnitt aus einer Druckmaschine mit zwei an deren Auslage angeordneten Einschießgeräten;

Fig. 8

eine Schnittdarstellung der in der in der Fig. 7 gezeigten Auslage vorgesehenen Teilstapel jeweils mit einem darin eingeschossenen Streifen.

Show it:

Fig. 1

a diagram with a single error within a working period of a Einschießgerätes;

Fig. 2

a diagram with a repetition error within a working period of the Einschießgerätes;

Fig. 3

a diagram with a repetition error within several consecutive working periods of the Einschießgerätes;

Fig. 4

a diagram with a lasting at the end of a working period of Einschießgerätes permanent error;

Fig. 5

a section of a printing press with a arranged at the delivery Einschießgerät;

Fig. 6

a sectional view of the in the in the Fig. 5 shown stack provided with a strip inserted therein;

Fig. 7

a section of a printing press with two arranged on the delivery Einschießgeräten;

Fig. 8

a sectional view of the in the Fig. 7 shown partial stack provided in each case with a strip inserted therein.

In a printing press, z. As in a sheet-fed press, especially in a sheetfed offset press, at least one printing unit of this printing press sequentially fed sheet at least one ink, but preferably multicolored by several in the transport direction of the sheet in the printing press successively arranged printing units at least on one side, preferably in perfecting on both sides z. B. printed in an offset printing process. The printed in the printing machine sheets are placed after completion of the printing process at the end of the printing press in a stack preferably arranged on the printing press in a stack.

To check the print quality of printed in the printing sheet is a z. B. opto-electronically designed inspection system, in particular arranged in the printing press inline inspection system with a preferably arranged in the transport direction of the sheet behind the last printing unit of the printing press Camera, z. B. with at least one CCD chip having a semiconductor camera, said camera at least from a portion of a printed sheet, preferably of the entire sheet and / or of all printed in this printing machine in each case a picture, z. B. receives a color image and preferably in the form of digital data to an electronic evaluation unit, for. B. leads to an image processing computer, wherein in the evaluation unit, a currently recorded image based on a reference image with respect to at least one print quality affecting error, z. B. with respect to a color error and / or a registration error is checked and wherein the evaluation unit in an insufficient match between the currently recorded image and the reference image, ie at a detection of a predetermined tolerance limit exceeding and thus no longer tolerable error, an error message in the form an electronic control signal outputs, with this control signal z. B. an error of the faulty sheet indicating optical or acoustic display device and / or arranged in the transport path of the faulty sheet, this sheet Ausschleusende Makulaturweiche and / or marking the faulty sheet marking and / or a faulty sheet after its deposition in the in the delivery of the printing press provided stack identifiable making strip Einschusssystem is controllable.

The inspection system is preferably equipped with the function to determine the position of an error detected on a sheet and / or detected errors according to predetermined different types of errors, such as. B. color errors and register errors represent, to distinguish. The control signal output by the evaluation unit of the inspection system to the at least one strip insertion system is preferably in the form of a digital, in particular electrical, signal, e.g. B. formed as a switching pulse, wherein each switching pulse correlates with at least one faulty arc. However, the control signal output by the evaluation unit of the inspection system to the at least one strip insertion system can also be of a complex nature and a plurality of control signals for the at least one strip insertion system contain relevant information.

A Streifeninschusssystem has at least a Einschießgerät and a strip holder, wherein the einzustießende in the stack of the deposited sheet strip z. B. held as a roll material in a trained as a roll holder strip holder and after rolling from the role according to the required strip length is cut to length with a cutter by a strip separating the strip from the roll. Triggered by a control signal indicative of an error detected by the inspection system in at least one of the printed sheets, the marker shoots a strip between an upper edge of the sheet already deposited in the stack and a sheet currently to be deposited on that stack, and thus the sheet already in the stack filed bow at least not yet fully touching bow. Once the newly deposited on the stack sheet rests on the stack so that thereby the shot strip is held in the stack, this z. B. unrolled from a roll strip cut off the roll.

The Einschießgerät can z. B. on a Seitengradstoßer belonging to the printing press display. It is also possible to mount the Einschießgerät on a tripod and to put next to the belonging to the printing press display. The first variant is z. B. in a so-called large format printing machine, in which case z. B. an automatic format adjustment is provided. The second variant mentioned above is z. B. realized on a medium format printing press, in which case an automatic, z. B. remote controlled format adjustment is not given. It is preferably provided that the position of the at least one at least one faulty sheet characterizing Einschießgerätes and thus the aforementioned format adjustment is set by the evaluation of the inspection system.

The printing press prints sheets with a production speed of z. B. 15,000 or more sheets per hour, z. B. 18,000 or 21,000 sheets per hour, ie in Every second, more than four printed sheets arrive at the stack on the stack belonging to the printing press. Streifeneinschusssysteme reach this working speed usually not, but z. B. einschießen at the earliest half a second again a strip in the pile. The period of time required by the strip insertion system to again insert a strip into the stack is referred to below as the dead time Δt of the strip insertion system, the dead time Δt being a period duration as a result of the cyclic operation of the strip insertion system and being the fastest possible working cycle of the strip injection system Strip Einschusssystems can be viewed. The dead time .DELTA.t is z. B. on the order of at least about half a second and is thus much slower than the usual production speed of the printing press. A sheet-fed printing press can therefore deposit a plurality of sheets on the stack because of its high production speed during a dead time Δt of the strip insertion system.

A einzießender in the stack strip can, for. B. may be formed as a flat, band-shaped material made of paper or plastic, with different colored or provided with different color material can be used. It can be provided that the strip insertion system is able to mark a strip to be inserted in dependence of a further control signal or of a specific information contained in the control signal in a specific manner. Additionally or alternatively, it may be provided that several Einschießgeräte are arranged on the same belonging to a printing machine stack of sheets, wherein the plurality Einschießgeräte preferably einschießen each other differing strips in the same stack. These stripes can z. B. in their color, in their material and / or in their marking differ from each other. The mark can z. B. be printed with an inkjet printer.

Differently formed strips coming from the strip insertion system in the same Stack can be injected, to distinguish different types of errors, eg. B. for distinguishing a color error from a register error, and / or in particular for distinguishing between a single error and an error sequence can be used, wherein a training and / or marking the strip z. B. a single error or the beginning of an error sequence and another training and / or marking the strip z. B. identify the end of an error sequence. A single error is an error event which triggers the shooting of a strip into the stack, wherein no further error event is detected at any other within the dead time .DELTA.t of the strip insertion system on the stack beginning with the insertion of the strip. The end of an error sequence is then reached as soon as a dead time Δt of the strip insertion system commencing with the passage of a strip and after the laying off of one or more faulty sheets a faultless sheet is deposited on the stack.

The following are in conjunction with the Fig. 1 to 4 For example, four fault scenarios are described in each case with reference to a diagram, wherein in the respective fault scenarios faulty sheets are marked with the possibility of distinguishing between different errors. It is provided that preferably formed as a strip markings with two different configurations and / or markings are available, with one of the differently formed and / or marked markings, z. B. one of the strips, z. B. with "A" and the other label, z. B. the other strip, z. B. with "B" is called. The diagrams show in each case at least one error event detected by the print production in the printing press, ie in particular its inspection system, wherein the error events marked F1, F2 or F3 are each impulsively plotted over the time t, these error events F1, F2 or F3 each correlate with at least one detected as faulty bow. In the diagrams of Fig. 1 to 4 is the temporal relation between the dead time .DELTA.t of the strip injection system and an error event F1 represented in each case in pulse form; F2 is selected, for example, such that within each of the dead time .DELTA.t of the strip insertion system shown there, six sheets are printed in the printing press and checked by the inspection system, so that within each dead time .DELTA.t of the strip insertion system successively up to six error events F1; F2; F3 can occur. The markings marked "A" or "B", respectively stripes, can be z. B. differ in their respective material and / or at least in their respective color and / or in their respective caption from each other.

Fig. 1 shows by way of example that at least one fault has been detected by the inspection system on a sheet to be deposited on the stack, whereby a first error event F1 is marked so that a control signal is output from the inspection system to the strip insertion system. Since that in the Fig. 1 If the diagram shown represents only a small part of the production process, the illustrated time segment may have been preceded by an error-free production of printed sheets or the production of the printed sheets was just started at this time. Due to the detected error, the strip insertion system attaches an identifier marked "A" to the stack in conjunction with the arc detected as faulty. With the affixing of this mark marked "A", the strip insertion system begins to count the duration of its dead time Δt within which the strip insertion system is unable to apply further marking to the stack, since the stripline picking mechanism initially resumes firing a strip must return to a working condition that can be used again. In the in the Fig. 1 As shown, the inspection system does not detect an error within the dead time Δt of the strip insertion system at any other sheet to be filed so that it remains within that dead time Δt at the single detected error. The detected error is thus a single error with the singular error event F1, because in a sequence of z. B. six consecutively printed and to be deposited in the order of their production successive sheet only a single sheet has been found to be faulty.

Fig. 2 shows by way of example that - how to Fig. 1 an error event F1 is detected by the inspection system in conjunction with a sheet to be deposited on the stack, so that a strip corresponding to this error event F1 is injected into the stack by the strip insertion system. Again, the duration of the dead time Δt of the strip insertion system begins when the strip labeled "A" is fired. Unlike the one in the Fig. 1 In the example shown, at least one error occurs within the dead time Δt of the strip insertion system on at least one further sheet to be deposited on the stack, so that a further error event F2 has occurred within the dead time Δt of the strip insertion system. According to the in the Fig. 2 Example shown occur in a sequence of z. B. six sheets that are printed within the triggered by the first error event F1 dead time .DELTA.t strip Einschusssystems in the press and are subsequently stored on the stack arranged in the delivery of the printing press error repeatedly, but not permanently, because at the end of this dead time .DELTA.t the Streifeneinschusssystems the error has subsided already again, ie at the end of this dead time .DELTA.t of Streifenseinschusssystems a detected as faulty bow was produced. Since the sequence of faulty sheets within the dead time .DELTA.t of Streifenseinschusssystems has been terminated, because at least at the end of the dead time .DELTA.t of Streifeninschusssystems again at least one error-free sheet is filed, after this dead time .DELTA.t of Streifenseinschusssystems, within the at least two faulty sheet to Tray have arrived, injected a marked "B" strip in the stack. The two error events F1; F2 may also have been detected on two sheets to be deposited immediately after one another on the stack. In the in the Fig. 2 In the example shown, at least one perfect arc was produced between the two sheets identified as faulty.

If an error is detected by the inspection system on another sheet in the first dead time .DELTA.t of the strip insertion system beginning with the stacking of a strip marked "A" in the stack, then at the end of this first dead time .DELTA.t of the strip insertion system a strip marked "B" in FIG the stack is then injected and then at least one further error event F1 in the stripe beginning with the marking of the strip marked "B" in the stack, following the first dead time Δt of the strip insertion system. F2 occurs by detecting at least one error on at least one further sheet to be deposited on the stack, at the end of this further second dead time .DELTA.t of the strip insertion system, a further strip labeled "B" is injected into the stack, as described in US Pat Fig. 3 is shown, provided that the at least one detected within this further second dead time .DELTA.t of Streifeneinschusssystems error event F1; F2 at the end of this second dead time .DELTA.t of Streifenseinschusssystems as explained for Fig. 2 decayed again and the sequence of faulty sheets within this second dead time .DELTA.t of Streifenseinschusssystems has thus been terminated, because at least at the end of this second dead time .DELTA.t the Streifeneinschusssystems again at least one error-free sheet has come to the filing. It can in the way of in the Fig. 3 shown, more than two labeled with "B" strips are successively shot into the stack, namely, if several times in each case within that dead time .DELTA.t of the Streifeneinschusssystems, which begins with the shooting of a marked "B" strip in the stack, at least an error event F1; F2 is detected, but always at least one error-free arc between the detected in different periods of the dead time .DELTA.t of Streifeneinschusssystems error events F1; F2 at least at the end of each dead time Δt of the strip insertion system beginning with a strip labeled "B" Tray reaches the stack.

Fig. 4 shows the case that in the dead time .DELTA.t of the strip insertion system starting with the insertion of a strip marked with "A" into the stack, error events F1; F2 be detected, in contrast to those in the FIGS. 2 and 3 At the end of this dead-end Δt of the strip insertion system, which has been started with the insertion of the strip marked "A", a faulty sheet is deposited on the stack, which is why there is no streak at the end of this dead-time Δt of the strip insertion system begun with the insertion of the strip marked "A" , In particular, no marked with "B" strip is injected into the stack. The error event F3 occurring at the end of the dead time Δt of the strip insertion system commenced with the insertion of the strip marked "A" continues beyond the end of the dead time Δt of the strip insertion system begun with the insertion of the strip marked "A", ie there are consecutively faulty sheets placed on the stack. A special case of in the Fig. 4 In the example shown, starting with the first sheet detected as being faulty, all further sheets reaching the stack on the stack are defective, whereby the error event F3 directly follows the first error event F1. Accordingly, after the dead time Δt of the strip injection system commenced with the insertion of the strip marked with "A", no further period of the dead time Δt of the strip insertion system immediately follows. The error event F3 ends with the fact that after the sequence of faulty sheets again at least one error-free sheet is stored on the stack. At the end of the arbitrarily long sequence of erroneous sheets to be deposited on the stack, a strip marked "B" is injected into the stack in correlation with the first error-free sheet, thereby marking the end of the sequence of defective sheets.

On the basis of the sequence in the stack shot strips can in the Stack single faulty sheets or areas of flawed sheets to be marked. From the into the Fig. 1 to 4 For the purpose of identifying faulty sheets in the stack, the following conclusions can be drawn: Thus, in conjunction with the in the Fig. 1 that in the stack of consecutive sheets between two strips marked "A" there is only one faulty sheet above the lower of these two strips marked "A". Follow in the stack in the stacking direction, dhid R. from the bottom to the top, a strip marked with "A" on one another several strips marked with "B" ( Fig. 3 ), so all but the top with "B" marked strip z. B. be removed by pulling out of the stack and it results in the stack between the lower in the stack marked with "A" stripes and the stack higher located uppermost with "B" marked strip area with multiple faulty bow. In addition, it should be noted that there is an area with a defect-free sheet in the stack between a strip marked "B" lower in the stack and a strip marked "A" higher in the stack.

To ensure that faulty sheets are always in the stacking direction above strips labeled "A", and especially in the event of persistent errors below an associated strip marked "B", a strip marked "A" may be extended by several, e.g. B. premature by up to three sheets and marked with "B" strip to several, z. B. be delayed by up to three sheets late in the stack.

When a longitudinal cutting device is arranged in the transport path of the printed sheet in the printing press on its way to the printing machine belonging to the delivery, wherein the longitudinal cutting device divided along its arc guided by a longitudinal section, z. B. divides into two equal halves, then arise z. B. on the Storage surface of the stack to be formed in the delivery in correlation to the number of longitudinal sections performed a number of subdivision of a stack of stacks, namely always a total of a sub-stack more than longitudinal cuts are performed, each of these sub-stacks individually and separately from the other or the other sub-stack (n ) can be further processed. The intersection between two sub-sheets correlates within the stack formed by depositing a plurality of divided sheets between two adjacent sub-stacks with an interface passing vertically through the stack. If the individual parts of the longitudinally-cut sheets are not fed to different destinations on their way to the delivery of the sheet-fed printing press, but are placed next to each other in the delivery on the storage area provided for the undivided sheets, only a single one arises in the delivery - in a purely external view Stack, which, however, is traversed in its interior according to the number of longitudinal sections taken by vertical interfaces and thus forms at least two easily separable part of stack.

In order to be able to identify faulty sheets in each of these sub-stacks, which are preferably arranged adjacent to one another, a plurality of strip-insertion systems corresponding to the number of individual partial stacks or at least insertion devices are provided on the delivery of the printing press. If the slitter halves printed sheets, z. B. be provided by the same Streifeneinschusssystem controlled Einschießgeräte. On the other hand, it can also be provided that at the display of the printing press are arranged several neither mechanically nor electrically interconnected, but at least independently controllable and thus self-sufficient, each having at least one Einschießgerät strip systems, each of these Streifeneinschusssysteme one of the sub-stack is assigned.

Information about the printed sheet-related position of the cutting line executed by the slitter is preferably in the inspection system deposited so that the inspection system z. B. the multiple Einschießgeräte controlling strip Einschusssystem can control differentiated. Depending on which part of the arc the inspection system detects an error, then the respective sub-stack, in which this sub-sheet is stored, associated Einschießgerät is activated and activated. It may also be provided to print information on the position of the error detected by the inspection system on the strip to be buried, wherein the position z. B. may be indicated by referenced on the unbroken arc coordinates.

Fig. 5 shows in a plan view of a section of a printing machine, wherein in the transport direction T of the printing material, in particular the succession of sheets to be printed, several, preferably each other printing ink verdruckende printing units 01 are arranged. Behind the last in the transport direction T printing unit 01 is a belonging to the printing press display 02, wherein the printed in the printing machine sheets are stored in a stack 03 to each other. On one side of the stack 03, z. B. at a transversely to the transport direction T of the sheet-facing side, a Streifeneinschusssystem is arranged with at least one Einschießgerät 04, which einschießt a strip 06 in the stack 03.

Fig. 6 shows in a side view along a line XX extending section through the in the Fig. 5 illustrated stack 03, the line XX transverse to the transport direction T of the arc. The Einschießgerät 04 rolls due to its activation by a control signal, this control signal is preferably generated by an arranged in the printing machine inspection system, eg. B. strip-shaped material from a roll holder 07 and performs an unrolled from the roll holder 07 end of the material to the upper edge 08 of the stack 03, whereby a strip 06 of sufficient length of this material is placed on the top 03 lying in the stack bow. After at least one of the delivery 02 fed sheet has been placed on the stack 03 and thereby the strip 06 sufficient is held, that is fixed by at least one other sheet, this strip 06 is cut off from the roll of material. In the roll holder 07 z. B. several roles of einzuschießenden material to be kept, with these reproached in the same role holder 07 roles for the execution of different markings z. B. in their respective color and / or mark differ from each other and wherein the Einschießgerät 04 depending on the applied control signal selects a previously assigned to the respective control signal role and rolls.

Fig. 7 shows in a plan view of a section of a printing press, the arrangement shown substantially that in the Fig. 5 like. In contrast to the arrangement of Fig. 5 be printed in the printing machine by a bow behind the transport direction T last printing unit 01 arranged longitudinal cutting device 09 in two z. B. equally wide parts, with both parts of each sheet are each stacked as a partial sheet in belonging to the printing press display 02 each side by side in two sub-stacks 03. Each sub-stack 03 is in each case a Einschießgerät 04 arranged, which each einschießt a strip 06 in the respective sub-stack 03.

Fig. 8 shows - similar to the Fig. 6 - In a side view along a line YY extending section through in the Fig. 7 Partial stack 03 shown, wherein the line YY transverse to the transport direction T of the arc. Both Einschießgeräte 04 roll in their activation in each case by a control signal, each of these control signals is preferably generated by an inspection system arranged in the printing press, z. B. strip-shaped material from each of the respective Einschießgerät 04 associated roller holder 07 and each lead one of the respective roller holder 07 unrolled end of the material to the upper edge 08 of the respective sub-stack 03, whereby a strip 06 sufficient length of this material on the in the respective sub-stack 03 uppermost sub-sheet is launched. The two sub-stacks 03 border in the pile considered externally as a single stack Although they abut each other, however, they are mechanically separated from each other at the interface 11 passing through the stack. After at least one more of the delivery 02 supplied partial sheet has been placed on the part stack 03 and thereby the respective strip 06 is sufficiently retained, this strip 06 is cut off from the roll of material.

As an alternative to the preferred embodiment described above, instead of using one or more strip insertion systems, each having at least one slotting machine, a writing or arc-marking device may be used in a stack of sheets placed on top of each other according to the purpose of the invention preferably used Einschießgerätes makes a single faulty sheet or a region with several faulty bow by a unique, outside the stack preferably easily perceptible marking or marking identifiable.

The proposed method may also be described as a method for treating at least one defective sheet, wherein at least one defective sheet is treated in a stream of sheets printed in a printing press with a device, the printed sheets being sequentially fed to at least one printing press-related delivery be, with the treatment of at least the one faulty sheet is carried out on its transport to the delivery. The treatment on a sequence of sheets following the selected sheet begins with a selection of an errored sheet from the sheet being delivered, the treatment commencing on the sequence of sheets beginning with the selected sheet until a lapse of a dead time Δt started with the selection made the device is continued, at the earliest with the expiration of the dead time .DELTA.t started with the selected sheet, the treatment of another the sheet selected in the stream for display is carried out by the apparatus.

The selected arc, which is considered to be defective, together with the sequence of sheets following it during the dead time, is preferably discharged from the device for disposal or reworking from the stream of sheets guided to the delivery. The selection of a sheet out of the stream of sheets delivered to the display is in particular with a z. B. at least one CCD camera having carried inspection system, wherein the inspection system at least a subset of the outfeed sheet an image is taken, wherein a currently recorded image based on a reference image with respect to at least one of the print quality of the printed sheet impairing error or a type of error is checked, with an insufficient match between the currently recorded image and the reference image an error message z. B. is generated in the form of a control signal. With the error signal transmitting control signal z. B. an error of the faulty sheet indicating optical or acoustic display device and / or arranged in the transport path of the faulty sheet, this sheet Ausschleusende Makulaturweiche and / or marking the faulty sheet marking and / or a faulty sheet after its placement in a in the stack of the printing machine provided stack identifiable making strip Einschusssystem.

With the method for the treatment of at least one faulty sheet, in analogy to the methods for marking at least one faulty sheet, individual defective sheets or a sequence of printed sheets having the at least one faulty sheet can be treated such that the single faulty sheet or the at least one faulty sheet faulty sheet having sequence of printed sheets are excluded from the intended for error-free sheet further processing. Also more of the previously in particular with the FIG. 1 to 8 described features can be realized in the method for treating at least one faulty sheet.

LIST OF REFERENCE NUMBERS

01

printing unit

02

display

03

Stack, partial stack

04

Test apparatus

05

-

06

strip

07

roll holder

08

top edge

09

Slitter

10

-

11

interface

A

strip

B

strip

F1

error event

F2

error event

F3

error event

T

transport direction

t

over time

.delta.t

dead

X X

line

Y-Y

line

Claims (6)

A method for excluding at least one faulty sheet from a further processing provided for a defect-free sheet, wherein at least one defective sheet in a stream of sheets printed in a printing press is excluded from further processing with an apparatus, wherein an inspection system prints a print quality of the one printed in the printing press Sheet checks, the printed sheets are fed sequentially at least one belonging to the printing press display, wherein the exclusion of at least one faulty sheet is carried out by its further processing on its transport to the display, with a selection of the faulty sheet from the sheet to be exported to the exclusion a sequence of sheets following the selected sheet from their respective further processing begins, with the exclusion of the sequence of sheets beginning with the selected sheet from their respective further processing until the expiration of a dead time of the device commenced with the selection made, whereby at the earliest on expiry of the dead time started with the selected signature, the device excludes from the further processing a further sheet selected from the sheets fed in the stream for display, wherein an image is taken with the inspection system at least from a subset of the sheet delivered to the display, wherein a currently recorded image is checked based on a reference image with respect to at least one of the printing quality of the printed sheet debilitating error, with an insufficient match between the currently recorded image and the reference image, an error message is generated, with the error message indicating the error of the faulty bow indicating optical or acoustic display device and the faulty sheet making identifiable Streifeneinschusssystem a be controlled, so that the faulty bow after its storage in a provided in the delivery of the printing machine stack is identifiable. A method according to claim 1, characterized in that the selected sheet together with the sequence of sheets following it during the dead time are discharged from the apparatus from the stream of sheets guided to the delivery. A method according to claim 1, characterized in that the selection of a sheet is carried out from the stream of sheets delivered to the delivery with the inspection system. A method according to claim 1, characterized in that with the error message arranged in the transport path of the faulty sheet, this sheet discharging Makulaturweiche and / or a faulty sheet marking marking is controlled. A method according to claim 1, characterized in that the inspection system uses a camera. A method according to claim 1, characterized in that the inspection system detects a position of an error detected on a sheet and / or detected errors are differentiated according to previously defined different types of errors.

Images