WO2016008990A2

WO2016008990A2 - Sheet removal during digital printing

Info

Publication number: WO2016008990A2
Application number: PCT/EP2015/066297
Authority: WO
Inventors: Werner Ladner; Hansjörg Klein
Original assignee: Bielomatik Leuze Gmbh + Co. Kg
Priority date: 2014-07-16
Filing date: 2015-07-16
Publication date: 2016-01-21
Also published as: WO2016008990A3; DE102015213374A1

Abstract

The invention relates to a device (1) for producing printed matter, said device having an unwind unit (2) for providing paper to be printed. According to the invention, a print unit is arranged downstream of the unwind unit (2), said print unit printing the paper, a cross cutter (4) is arranged downstream of the print unit, said cross cutter cutting the printed paper that is continuously fed to said cross cutter, the cutting being transverse to the feed direction, such that individual printed sheets are provided, a collection unit (5) to collect the sheets fed to the collection unit is arranged downstream of the cross cutter (4), a feed unit (6) is located downstream of the collection unit (5), at least one additional unit to finish the printed matter to be produced is arranged downstream of the feed unit (6). When viewed in the feed direction, at least one switch (7) is located behind the cross cutter (4), said switch enabling at least individually printed sheets to be discharged during the production process.

Description

DESCRIPTION

Sheet ejection in digital printing

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 cross cutter, the him endlessly supplied printed paper across the 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. This makes it possible in an advantageous manner, auszuschleusen either a single printed sheet to check these, for example, in terms of print quality or other important for the finished printed matter criteria, or even collected sheets or already processed sheets from the Hersteilvorgang to be checked out. This makes it possible to respond quickly and effectively to possible errors and not have to wait until the completion of the manufacturing process to have to check the then finished hersteilte 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 for each Manufacturing time after the cross-cutting already processed single sheets or sheet stack are removed from the manufacturing process 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 change, 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) can be printed. 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 understood to mean the format of the sheet of the paper to be printed, in particular length and width, and paper type and paper thickness, but also the format of the product to be produced 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 additional materials supplied (such as cover thicknesses, where the necessary adjustments are to be made sequentially at the right time), binding method, number of subsequent processing steps (for example, with or without corner rounds, donating 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 Endlospapier 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 the latter cross-cuts the printed continuous paper web at the correct location, 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, although other types of printing are not excluded.

With this device 1 for digital printing, black-and-white or colored printed matters are to be produced individually in small numbers.

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

The subsequent printing process is carried out by a digital printing unit 3, which is arranged downstream of the Abrolleinheit 2 and the paper rolled there is fed for printing.

The unrolled from the unwinding unit 2 and the digital printing unit 3 supplied paper is first printed and verißt the digital printing unit 3 in the form of a quasi-endless web. This quasi-endios web is fed to a cross-cutter 4, which according to the predetermined format of the produced Printed matter, the quasi-endless web, which is printed, cross cuts, which initially one format of the later printed matter (possibly with the addition of tolerances) is set.

After the cutting process of the cross cutter 4 this is followed by a collecting unit 5. In this collecting unit 5, individual pages of the printed matter to be finished later can be collected and aligned as required (optional).

The collecting unit 5 in turn is followed by a feeder unit 6. This feeder unit 6 causes, when the collecting unit 5 is present, the individual sheets provided there to be stacked into a desired pile, that is, to be collected while being put together in a position where the further processing is to take place. If the collecting unit 5 does not exist, it is conceivable that the printed matters leaving the cross cutter 4 are fed directly to the feeder unit 6.

The investor unit 6 may, but need not be followed by a switch 7. With this switch, it is possible to eject test prints, for example, to check for quality of the printing process out.

The output from the investor unit 6 stack with the printed matter, which are not discharged via the existing switch 7, a stapling and folding unit 8 are supplied. With this unit 8, the hitherto located in the pile printed matter depending on the desired format of the finished printed matter stapled 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 are fed to a cutting unit 9. By means of the cutting unit 9, the added tolerances of the individual merged leaves of Printed matter to be removed on the finished format of the final printed matter. At the end of the cutting unit 9 is followed by a discharge unit 10, in which the finished printed matter for further use, for example, the package in desired thread supplied.

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

In a known embodiment, the digital printing unit 3 is the master for the entire printing, cutting and Abiageprozess. In particular, the units following the digital printing unit 3 are connected together 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 predetermined clock of the master.

This can lead to problems if, for example, the clock is specified by the digital printing unit 3 as the master, but at the same time a problem occurs in one of the slave downstream units or, for example, via the switch 7 a test print is to be taken. Such a sampled proof is then no longer available to the unit 7 downstream units, so that they come out of sync.

From the unwinding unit 2, a quasi-continuous paper sheet having a predetermined width is supplied to the digital printing unit 3. After printing of the supplied paper web in the digital printing unit 3, a register mark is printed on a register mark, which in addition to the actual printed matter on the paper by means of the digital printing unit 3. With this register mark recognizes the subsequent cross cutter 4, at which point the supplied quasi-endless web must be cut across. After the supplied printed quasi-endless paper web leaving the digital printing unit 3 and was cut by the cross cutter 4 transversely to the feed direction, then with a predetermined length (viewed in the feed direction) and due to the width of the paper web in the Abrolleinheit 2 predetermined width a printed matter is available ,

This printed matter may be one, two or more than two. This means that on the sheet leaving the cross cutter 4, a single page of a later finished printed matter with a given 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 processes, the format of the printed matter behind the cross cutter 4 is fixed due to the mechanical conditions. 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 cross cutter 4 and the following units up to the casserole unit 10 can be individually controlled by means of actuators by the control unit 11 with regard to the processing format of the fed sheets. So it is possible over a single command! the control unit 11, the units controlled by it, in particular the cross cutter 4, the collecting unit 5, the feeder unit 6, the stitching and folding unit 8 and the cutting unit 9 to give the command of a predetermined, in particular previously processed format on one of them switch different format. For example, it is possible for the digital printing unit 3 to print sheets that 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 the control unit 11 take place. As a result of a corresponding control command of the control unit 11, a corresponding changeover of the printing process takes place in the digital printing unit 3. Since the digital printing unit 3 also prints three corresponding sheets for the further three-minute processing process, the following units receive the command from the previously used two-size format to the now to change the desired three-size format.

This process can be arbitrarily controlled by a corresponding input in the control unit 1. 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 for digital printing. Through this flexible timing, the digital printing unit 3 can provide the printed sheets, depending on the provided printed quasi-endless web leaving the digital printing unit 3, the subsequent units of these printed sheets in response to the clock at which this digital printing unit 3 leave, process. The flexible timing of the subsequent process has the particular advantage that withdrawals of sheets on the switch 7, but also other disturbances (for example paper jam) in the process, which is the digital printing unit 3 downstream, can be compensated or compensated without the entire device 1 to stop. LIST OF REFERENCE NUMBERS

1. Device for digital printing

2nd unwinding unit

3. Digital printing unit

4. Cross cutter

5. Collection unit

6. Investor unit

7. Switch

8. Stapling and folding unit

9. Cutting unit

10. outlet unit

1 1st control unit

Claims

PATENT APPLICATIONS

1. A device (1) for producing printed matter, comprising a Abrolleinheit (2) for providing paper to be printed, wherein the Abrolleinheit (2) is followed by a printing unit which prints the paper, wherein the printing unit is arranged downstream of a cross cutter (4) which cuts the printed paper fed endlessly across the feed direction so as to provide individual printed sheets, with a collecting unit (5) arranged downstream of the cross cutter (4) for collecting the sheets fed thereto, the collecting unit (5) being 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 to be produced, characterized in that viewed in the feed direction behind the cross cutter (4) at least one switch (7) is arranged with the at least individual printed sheets can be discharged from the manufacturing process.

2. Device (1) according to claim 1, characterized in that the at least one switch (7) is arranged directly behind the cross cutter (4).

3. Device (1) according to claim 1, characterized in that the at least one switch (7) is arranged directly behind the collecting unit (5).

4. Device (1) according to claim 1, characterized in that the at least one switch (7) is arranged directly behind the feeder unit (6).

5. Device (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 a stapling and Faizeinheit (8) and / or a cutting unit (9) and / or an outlet unit (10) is.

6. Device (1) according to one of the preceding claims, characterized in that the printing unit is a digital printing unit (3).