DE102015213374A1 - Sheet ejection in digital printing - Google Patents

Abstract

The invention relates to a device (1) for producing printed matter, comprising a unwinding unit (2) for providing paper to be printed, wherein the unwinding unit (2) is followed by a printing unit which prints the paper, the printing unit being a cross cutter (4). is arranged downstream, which cuts the printed paper fed endlessly across the feed direction, so that individual printed sheets are provided, the cross cutter (4) is followed by a collecting unit (5) for collecting the sheets fed to it, wherein the collecting unit (5) a feeder unit (6) is arranged downstream, wherein the investor unit (6) is arranged downstream of at least one further unit for finishing the printed matter, wherein viewed in the feed direction behind the cross cutter (4) at least one switch (7) is arranged, with the at least single printed Bends can be removed from the manufacturing process.

Description

The invention relates to a device for producing printed matter, comprising a Abrolleinheit for providing paper to be printed, wherein the Abrolleinheit a printing unit is arranged downstream, which prints the paper, wherein the printing unit is arranged downstream of a sheeter, the transversely fed to him endlessly supplied printed paper Feed direction cuts, so that individual printed sheets are provided, wherein the cross cutter is arranged downstream of a collecting unit for collecting the sheets fed thereto, wherein the collecting unit is arranged downstream of a investor unit, wherein the investor unit is arranged downstream of at least one further unit for finishing the printed matter, according to the features of the preamble of claim 1.

The invention is therefore based on the object to provide a device for digital printing, with a quick review of the later printed matter is possible.

This object is achieved in that viewed in the feed direction behind the cross cutter at least one switch is arranged with which at least individual printed sheets can be discharged from the manufacturing process. As a result, it is advantageously possible either to eject a single printed sheet in order to check this, for example, with regard to print quality or other important criteria for the finished printed matter, or to eject collected sheets or already processed sheets from the production process in order to be able to check these , This makes it possible to respond quickly and effectively to possible errors and not wait until the completion of the manufacturing process in order to have to check the finished finished printed matter in terms of quality or other important criteria. Should be before, that is, before the completion of the printed matter to be produced by the rejection of at least individual printed sheets that errors could be detected, it can be reacted quickly and effectively, without first producing a larger number of finished printed matter and then the To notice mistakes.

In a further development of the invention, there are several possibilities to arrange the at least one switch behind the cross cutter in the feed direction. For example, it is conceivable that the at least one switch is arranged directly behind the cross cutter. This makes it possible to control the printed on the continuous paper and cut individual sheets after the discharge. Here, particular importance can be attached to whether the cross cutter has cut correctly at the desired location.

Alternatively or additionally, the at least one switch is arranged directly behind the collecting unit. This has the advantage that individual printed and cut sheets are collected in the appropriate number of pieces, so that a stack, which forms the finished finished printed matter, can be checked after the rejection by the switch for errors.

Alternatively or additionally, the at least one switch is arranged directly behind the feeder unit. Again, a check of the sheet stack is advantageously possible by discharging.

Alternatively or additionally, the at least one switch is arranged directly behind a stapling and folding unit and / or directly behind a cutting unit. Even in these cases, the arrangement of the at least one switch can be removed from the manufacturing process at the time of manufacture after the cross-cutting already processed individual sheets or sheet stack to check for errors or correctness of the manufacturing process.

The use of such at least one switch in the production process of the printed matter behind the cross cutter is particularly advantageous when the printing unit is a digital printing unit. With a digital printing unit, the format and / or the motif of the individual sheets can be changed very quickly. In such a case, it is after a format change of advantage that in the feed direction behind the cross cutter at least one switch is arranged to eject at least individual printed sheets or sheet stack and to check for errors after the format change can. If such an error is discovered directly or shortly after the format changeover, it can be responded to very quickly after it has been discharged via the switch, so that a larger amount of rejects can be avoided. By means of digital printing, different products (and not always the same as offset) same). The digital printing unit gives the switch via the control command, for example, auszuschleusen at least a very specific arc (in particular a Kalibierbogen). The switches can be installed in the necessary places in the production process, for example before stapling for quality control. The at least one switch may also be used to generate an "empty cycle" or multiple "empty cycles" to allow a longer format changeover time in the run. The term "format" is initially the format of the sheet understood the paper to be printed, especially so length and width and paper type and paper thickness. But it is also understood the format of the product to be manufactured or later finished, ie length, width, finished width per product, thickness of the paper, number of sheets to be collected (determines the page number), thicknesses of the supplied additional materials (such as cover thickness, the necessary adjustments to be made sequentially at the right time in each case), binding method, number of subsequent processing steps (for example, with or without corner rounding, insertion of reinforcing strips, etc.).

In addition, the removal of at least single printed sheets from the manufacturing process on the at least one switch is advantageous if the unrolled from the unwinding unit and the printing unit and the cross cutter fed Endlosspapier must be expired and replaced by a new continuous paper web. After a synchronization has taken place between the printing unit, in particular the digital printing unit, so that it cross-cuts the printed continuous paper web at the correct position, it can be checked before and / or afterward (that is to say after the synchronization) via the discharging via the at least one switch, whether after changing the continuous paper web, the synchronization is done correctly, that is, whether the cross cutter crosses in the right place.

The basis for the present invention is a device 1 for digital printing, but other types of printing are not excluded.

With this device 1 For digital printing, black-and-white or colored printed matter should be produced individually in small quantities.

The starting point for this printing process is a unwinding unit 2 the device 1 in which a roll of paper is held in a manner known per se and unrolled in accordance with the subsequent printing process.

The subsequent printing is done by a digital printing unit 3 , the dereeler unit 2 is downstream and the paper rolled out there for printing is supplied.

That from the unwind unit 2 unrolled and the digital printing unit 3 fed paper is first printed and leaves the digital printing unit 3 in the form of a quasi-endless train. This quasi-endless track becomes a sheeter 4 fed, which according to the predetermined format of the printed matter, the quasi-endless web that is printed across cuts, which initially a format of the later printed matter (optionally with the addition of tolerances) is set.

After the cutting process of the cross cutter 4 joins this one collection unit 5 at. In this collection unit 5 Individual pages of the printed matter to be finished later can be collected and aligned as required (optional).

The collection unit 5 in turn, a feeder unit closes 6 at. This investor unit 6 causes that when the collection unit 5 is present, stacked there provided individual sheets to a desired stack, that is collected and thereby created in a position in which further processing is to take place together. Should the collection unit 5 not exist, it is conceivable that the printed matter, the cross cutter 4 leave, directly the investor unit 6 be supplied.

The investor unit 6 can, but does not have to be, a switch 7 be downstream. With this switch, it is possible to eject test prints, for example, to check for quality of the printing process out.

The from the investor unit 6 delivered stack with the printed matter, which does not have the existing switch 7 be ejected become a stapling and folding unit 8th fed. With this unit 8th are the up to then in the pile printed matter stapled depending on the desired format of the finished printed matter and / or folded. Other forms of bringing together the individual sheets of the printed matter are of course also conceivable.

After the individual sheets of printed matter have been brought together permanently, they become a cutting unit 9 fed. By means of the cutting unit 9 The added tolerances of the individual merged sheets of printed matter can be removed to the finished format of the final printed matter. At the end of the cutting unit 9 follows an outlet unit 10 in which the finished printed matter for further use, for example, the packaging in desired thread supplied.

The units described so far are from a higher-level control unit 11 , which is shown schematically controlled.

In a known embodiment, the digital printing unit is 3 the master for the entire printing, cutting and filing process. Especially the digital printing unit 3 subsequent units are interconnected as a slave. This means that the digital printing unit 3 as master sets the clock for the subsequent processes and these must be based on the specified clock of the master.

This can cause problems when, for example, the digital printing unit 3 as master of the clock is given, but at the same time in one of the slave downstream units a problem occurs or, for example, on the switch 7 a proof should be taken. Such a sampled proof then stands that of the switch 7 Downstream units are no longer available, so that they come out of sync.

From the unwind unit 2 becomes a quasi-continuous paper sheet with a given width of the digital printing unit 3 fed. After printing the supplied paper web in the digital printing unit 3 is via a register mark, in addition to the actual printed matter on the paper by means of the digital printing unit 3 a register mark printed. The following cross cutter detects with this register mark 4 at which point the supplied quasi-endless web has to be cut transversely.

After the supplied printed quasi-endless paper web the digital printing unit 3 leave and from the sheeter 4 is cut transversely to the feed direction, then stands with a predetermined length (as viewed in the feed direction) and due to the width of the paper web in the unwinding unit 2 given width of a printed matter available.

This printed matter may be one, two or more than two. This means that on the sheet, which is the cross cutter 4 leaves a single page of a later finished printed matter of predetermined length and width is available. Often, however, a printed sheet will be available which includes two or more sheets of printed matter to be finished later.

In known devices for printing operations, the format of the printed matter behind the cross cutter is due to the mechanical conditions 4 fixed. For example, such machines can be converted from a two-in-one format to a three-user format by means of a complex conversion process. However, this requires a great deal of retrofitting, which significantly affects the performance of such machines.

The sheeter 4 and the following units up to the casserole unit 10 by means of actuators by the control unit 11 can be controlled individually with respect to the processing format of the supplied sheets. So it is possible, via a single command of the control unit 11 the units she controls, especially the sheeter 4 , the collection unit 5 , the investor unit 6 , the stapling and folding unit 8th and the cutting unit 9 to give the order to switch from a given, especially previously processed format to a different format. For example, it is possible for the digital printing unit 3 Sheets printed correspond to the other two-size format. These sheets are processed by appropriate format setting of the subsequent unit. Should now be a change from a two-size format, for example, to a dreinutziges format, this can be done centrally by the control unit 11 respectively. By a corresponding control command of the control unit 11 a corresponding changeover of the printing process takes place in the digital printing unit 3 , Now for the further three-minute processing the digital printing unit 3 also printed three corresponding sheets, the following units get the command to change from the previously used two-size format to the now desired three-size format.

This process can be controlled by a corresponding input in the control unit 11 arbitrarily control. Of particular advantage is the switching within the one-used, two-used and maximum three-purpose formats, as this the expense of actuators and the structural conditions in the respective units and optionally the associated sensors that detect the switchover from one to the other format, manageable remains.

With the appropriate control of the control unit 11 is also a particularly flexible timing of the device 1 given for digital printing. This flexible timing allows the digital printing unit 3 provide the printed sheets, depending on the provided printed quasi-endless web, the digital printing unit 3 leaves the subsequent units of these printed sheets, depending on the clock with which this digital printing unit 3 leave, process. The flexible timing of the subsequent process has the particular advantage that withdrawals of leaves on the switch 7 , but also other disturbances (for example, paper jam) in the process of the digital printing unit 3 is downstream, can be caught or balanced without the entire device 1 to have to stop.

LIST OF REFERENCE NUMBERS

1

Device for digital printing

2

unrolling

3

Digital printing unit

4

Sheeter

5

collection unit

6

investors unit

7

switch

8th

Stapling and folding unit

9

cutting unit

10

outlet unit

11

control unit

Claims (6)

Facility ( 1 ) for producing printed matter, comprising a unwinding unit ( 2 ) for providing paper to be printed, wherein the unwinding unit ( 2 ) is arranged downstream of a printing unit which prints the paper, wherein the printing unit is a cross cutter ( 4 ), which cuts the endlessly supplied printed paper transversely to the feed direction, so that individual printed sheets are provided, wherein the cross cutter ( 4 ) a collection unit ( 5 ) is arranged downstream for collecting the sheets fed to it, wherein the collecting unit ( 5 ) an investor unit ( 6 ), the investor unit ( 6 ) is arranged downstream of at least one further unit for finishing the printed matter to be produced, characterized in that viewed in the feed direction behind the cross cutter ( 4 ) at least one switch ( 7 ) is arranged, with which at least individual printed sheets can be discharged from the manufacturing process. Facility ( 1 ) according to claim 1, characterized in that the at least one switch ( 7 ) directly behind the cross cutter ( 4 ) is arranged. Facility ( 1 ) according to claim 1, characterized in that the at least one switch ( 7 ) directly behind the collection unit ( 5 ) is arranged. Facility ( 1 ) according to claim 1, characterized in that the at least one switch ( 7 ) directly behind the feeder unit ( 6 ) is arranged. Facility ( 1 ) according to one of the preceding claims, characterized in that the at least one further unit for finishing the printed matter to be produced is a stapling and folding unit ( 8th ) and / or a cutting unit ( 9 ) and / or an outlet unit ( 10 ). Facility ( 1 ) according to one of the preceding claims, characterized in that the printing unit is a digital printing unit ( 3 ).

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