EP3064327A1 - Method for register correction of a flat bed stamping machine - Google Patents

Abstract

The invention relates to a method for register correction of a Flachbettstanz- and / or - embossing machine (100) wherein by measuring the register of a respective printing (25) and / or punching (29) and / or embossing and / or creasing image on a web-shaped Substrate (24) is a determination of a register deviation and a correction path (k) to compensate for the register deviation. For this purpose, a shortened or overlong sheet (6) is generated using a cross cutter (10), which can subsequently be discharged. Advantageously, the register correction is carried out very quickly by the method according to the invention for register correction, while only a small amount of waste is produced. The invention also relates to a flat bed punching and / or embossing machine (100) for carrying out the method.

Description

The invention relates to a method for register correction of a Flachbettstanz- and / or - embossing machine according to the preamble of claim 1 and a Flachbettstanz- and / or embossing machine with the preamble features of claim 6.

State of the art

Punching is defined as cutting with self-contained geometrical shapes, which can be circular, oval or polygonal as well as fantasy shapes of all kinds. The punching takes place against a punching pad or against a stamp, in some cases it is also shearing operations. Plastic packaging materials, film material, paper, cardboard, cardboard or corrugated board are mainly punched in sheet format but also in web format. When punching but also creasing lines or blind embossing can be introduced into the benefit. As the final products are sophisticated packaging in terms of technical and graphic design (special packaging for cosmetics, cigarettes, pharmaceuticals, food, etc.). special requirements are not only placed on the packaging materials themselves, but also punching tools with the smallest tolerances and extremely precise and reliable punching machines are required for optimum results. Flatbed punching best meets these demands. In this case, in the case of sheet processing, the printed sheets stacked on a pallet are fed to the punching machine. In the case of web processing, the printing material web is fed via infeed rollers or feed rollers to the flatbed punch. In order to be able to process the printing material web at standstill, the printing material web in the flatbed punch is iteratively stopped by temporarily storing the following web in a web store with a dancer roll.

In the EP 2 080 600 A1 a flat bed stamping module for punching a printing material is disclosed, with an upper crucible and a saucer, wherein the saucer by means of a Drive is movable relative to the frame-fixed upper crucible for performing a punching stroke for punching the passing between the upper crucible and the saucer printing substrate. As a result, the saucer is employed on the upper crucible, and the printing material is processed by means of at least one punching tool. The flat bed stamping module has a printing material transport device for guiding the printing material, which is firmly held on the movable saucer. The flatbed punching module can be used in a flat bed punch for processing a printing material web and contribute to a stable web run.

It is also known to operate such punches inline with rotary printing machines. Such a manufacturing system is used for example in the EP 1 731 277 B1 described.

For cost and environmental reasons, the aim is to get along with the least possible waste in the production of the above-mentioned packaging materials in printing press and flatbed punching machine.

If a visible register error occurs, i. If the printed image and the stamping image fall apart, the resulting products no longer meet the quality standard and waste is created. The same problem exists with other processing methods such as e.g. Creasing, embossing, foil embossing.

To correct the register error, a substrate web to be processed is slowly moved relative to the processing tools during operation, so as to prevent backlog of material in the downstream stations, such as e.g. Avoid breakers and divisors. Due to this only small correction movement of a few millimeters, it can take a long time until register-accurate production again. As long as waste continues to be created.

task

The object of the present invention is therefore to describe a method for register correction of a flat bed punching and / or embossing machine and to such a machine create faster registry correction and reduce waste.

This object is achieved by a method for register correction of a flat bed punching and / or embossing machine having the features of claim 1 and by a flat bed stamping and / or embossing machine having the features of claim 6.

According to the inventive method for register correction, in a first step, a measurement of the register of a respective printed image and / or punching image and / or groove image and / or embossed image takes place on a web-shaped substrate. Subsequently, a register deviation and a correction value for compensating the register deviation are determined. The register deviation may be a register error of the print image, e.g. an erroneous distance between two print images on the web-shaped substrate or a color register error, or a register error due to a deviation between the print image and punching or creasing or embossing image. The required correction path is determined so that it is as short as possible and as little paper waste as possible. In a subsequent step, the web-shaped substrate is transported into a flat-bed punching and / or embossing station, taking into account the previously determined correction path. Then, a separation of the web-shaped substrate by means of a cross cutter and thereby generating a shortened or overlong sheet. This split sheet can be subsequently discharged as it represents waste. Each succeeding sheet can then be edited in register again. Advantageously, the register correction is carried out very quickly by the method according to the invention for register correction, while only a small amount of waste is produced.

In a particularly advantageous development of the method, the register deviation is detected by means of an inspection system and the correction path is determined by a machine control. Alternatively, register deviation may also be done by the machine operator, either "with the naked eye" or using optical aids. A required correction path can then be entered by the machine operator via an interface in the machine control.

According to the invention, the register of the printed image can be measured by detecting the printed images on the web-shaped substrate prior to entering the web-shaped substrate in the cross cutter. This is the measurement of the pressure register. Additionally or alternatively, the register of the stamping or embossing or creasing image can be measured to the printed image by detecting an already processed sheet after the punching process.

It is considered particularly advantageous if the method for register correction is carried out during the operation of the flatbed punching and / or embossing machine, that is to say that the machine also performs work strokes during the register correction and is not stopped. A register correction during operation of the machine can be carried out very quickly, usually during a power stroke. On the other hand, stopping the flat-bed punching and / or embossing station with subsequent register correction would take a significantly longer time and thus produce waste again.

However, in the case of a large required correction path, namely, when the correction path is greater than the maximum shortening or lengthening of an arc, it may be necessary to distribute the offset of the register deviation over several working cycles, i. at least one further, shortened or overlong arc is generated and rejected.

The method according to the invention can be used both during startup and during operation of the flatbed punching and / or embossing machine.

The invention also relates to a flat bed punching and / or embossing machine, which is particularly suitable for carrying out the register correction method described above, with a web feed for feeding a web-shaped substrate, with a cross cutter for separating the web-shaped substrate into individual sheets, with a flat bed punch - And / or embossing station and a sheet delivery for storing stamped sheet. According to the invention in the web running direction upstream of the cross cutter and / or downstream of Flachbettstanz- and / or -prägestation each arranged an inspection system for monitoring the web-shaped or arcuate substrate to register errors. Between the Flachbettstanz- and / or - embossing station and the sheet delivery a switchable diverter is arranged for discharging faulty sheet and adjacent to the sheet diverter, a sheet storage device is provided for receiving the discharged sheet. The sheet storage device is designed in particular as a sheet cassette and may have a shredder for crushing the discharged bow.

In an advantageous embodiment of the Flachbettstanz- and / or embossing machine, the web feed on a web storage. The web store can temporarily store the incoming web-shaped substrate during the processing operation in the flat bed punching and / or embossing station and eventual ejection of a faulty sheet, and provides sufficient web-shaped substrate for a subsequent processing operation. This is particularly necessary if the flatbed punching and / or embossing machine is coupled inline with a web printing machine for printing on the web-shaped substrate and operated in conjunction therewith.

In an advantageous embodiment of the Flachbettstanz- and / or embossing machine whose sheet delivery has a breaker unit and / or a Nutzentrenneinheit.

The described invention and the described advantageous developments of the invention are also in any combination with each other advantageous developments of the invention.

With regard to further advantages and constructive and functional advantageous embodiments of the invention, reference is made to the dependent claims and the description of an embodiment with reference to the accompanying drawings.

embodiment

Figur 1

eine erfindungsgemäße Flachbettstanzmaschine

Figuren 2 a - c

fehlerbehaftete Substratbahnen bzw. Bogen

Figuren 3a und b

die Flachbettstanzmaschine im Bereich einer Bogenweiche

The invention will be explained in more detail with reference to a preferred embodiment. In a schematic representation:

FIG. 1

a flat bed punching machine according to the invention

FIGS. 2 a - c

faulty substrate webs or sheets

FIGS. 3a and b

the flatbed punching machine in the area of a curved diverter

Corresponding elements and components are provided in the figures with the same reference numerals.

The FIG. 1 shows a schematic view of a flat bed punch 100 according to the invention. The illustrated embodiment of the flat bed punch 100 is modular in horizontal construction. The processing of a substrate web 24, for example, printed by a previous web press 8 on a cardboard web cartons takes place in this illustration from right to left: Coming from a web feed 14 reaches the substrate web 24 in the web direction B in the Flachbettstanz- and / or -prägestation, below referred to as a flat bed punching station 12, in which the printing material 24 is cut by a lifting movement H of a blank equipped with punching knife 28 against a top bar 26 such that in subsequent processing steps individual printed products, eg folding box blanks, broken out of the printing substrate 24 and are separable from each other. Instead of or in addition to the punching can also be a grooving, embossing or foil stamping done. The separation into individual sheets is already at the inlet of the flat bed punching station 12. Here is a cross cutter 10, which separates the printing substrate 24 into individual sheets. About a flat bed punching station 12 downstream transport unit 16 the separated sheets enter a sheet delivery with a Ausbrechereinheit (so-called. Stripper) 18 and a Nutzentrenneinheit 20, in which the printed products from trimming (waste) are separated and separated. The printed products are then laid out in a product display 22.

Directly upstream of the cross cutter 10, an inspection system 30 is arranged for monitoring the printing material web 24 for registration errors. Additionally or alternatively, an inspection system 30 may be provided downstream of the flat bed punching station 12. The first purpose is the detection of pressure register errors, the second of the registration of register errors between printing and punching or creasing or embossing image.

The inspection systems 30 are connected to a machine control 60, by which an evaluation of the register measurements is made, a register deviation is determined and a required correction path k is calculated. Then can be transported from the transport rollers of the web feed 14 substrate in the flat bed punching station 26 and separated by the cross cutter 10. This results in an abbreviated or extended by the correction value k arc 6. This sheet 6 is processed in the flat bed punching station 26 by a stroke H. Since he can not be interpreted below on the sheet delivery 18, 20, 22, a curved switch 40 is actuated by the machine control 60 to auszuschleusen the shortened or overlong sheet 6 and store it in a sheet storage device 50. A subsequent sheet 7 is then register accurate again.

In the FIGS. 2a to 2c possible register errors 1000 are shown, which can be remedied in a flat bed punching and / or embossing machine 100 according to the invention and using the method according to the invention for register correction. In the FIGS. 2a and 2b are print register error 1000 shown, wherein the distance between two printed images 25 may have irregularities and, for example, too large (see. FIG. 2a ) or too small (cf. FIG. 2b ) can be. In both cases, a correction path k is required, which is represented in the figures by a double arrow. The dashed lines in the FIGS. 2a and 2b represent the position of the cutting line of a cross cutter 10, which separates the printing material 24 flag in sheets 6, 7. As can be seen, takes place in the FIG. 2a the correction in that a shortened arc is separated and in the situation according to FIG. 2b in that an overlong arc is separated. These faulty sheets 6 can subsequently be discharged.

In Figure 2c the register deviation between print image 25 and a punched image 29 is shown. For a register correction, ie to bring the print image 25 and punching image 29 into the register, a correction path k is required, which is implemented by a corresponding control of the web transport of the web feed 14 and the cross cutter 10 by the machine control 60.

In the FIGS. 3a and 3b the flat bed punching and / or embossing machine 100 is shown in greater detail in the area of its curved switch 40. As in FIG. 3a can be seen, a register-containing sheet 7 in web or sheet travel direction B across the curved switch 40 of a transport unit 16 is supplied and then further processed in the breaker unit 18 and the Nutzentrenneinheit 20 (not shown). The switchable curved switch 40 is in an undeflected state. If a shortened or overlong defective sheet 6 is generated for register correction, then the switchable sheet diverter 40 is actuated and deflected by appropriate control of the machine control 60, so that the faulty sheet 6 can be fed to a sheet storage device 50 and does not reach the sheet delivery 18, 20, 22 ,
A subsequently processed register-containing sheet 7 can then again as in Fig. 3a shown transported further.

LIST OF REFERENCE NUMBERS

6

faulty bow

7

Registered sheet

8th

Position printing machine

10

Sheeter

12

Flatbed punching and / or embossing station

14

web feed

16

transport unit

18

Fugitive unit

20

Blanking unit

22

product display

24

Substrate web (web-shaped substrate)

25

print image

26

upper platen

28

lower platen

29

punching image

30

inspection system

40

Bogenweiche

50

Sheet storage device

60

machine control

100

Flatbed punching and / or embossing machine

1000

register error

H

punching stroke

B

Web direction

k

correction path

Claims (10)

Method for register correction of a flatbed punching and / or embossing machine (100), comprising the following steps: a) Measuring the register of a respective printing (25) and / or punching (29) and / or embossing and / or creasing image on a web-shaped substrate (24) b) Determining a register deviation and a correction path (k) for compensating the register deviation (1000) c) transport of the web-shaped substrate (24) into a flat bed punching and / or embossing station (12) d) separating the web-shaped substrate with a cross cutter (10) and producing a shortened or overlong arc (6) e) discharging the sheet (6) Register correction method according to claim 1,
characterized,
that the register deviation (1000)) detected by means of an inspection system (30) in step b and the correction path (k) from a machine controller (60) is determined. Register correction method according to one of the preceding claims,
characterized,
that in step a) the register of the printed image (25) is measured by detecting the printed images (25) on the web-shaped substrate (24) before the web-shaped substrate (24) enters the cross cutter (10) and / or in step a). the register of punching (29) or creasing or embossing image to the printed image (25) is measured by a detection of a processed sheet (6, 7) after the punching process. Register correction method according to one of the preceding claims,
characterized,
in that between the steps d) and e) the flat bed punching and / or embossing station (12) executes a stroke (H). Register correction method according to one of the preceding claims,
characterized,
that in the case of a large required correction path (k) to balance out the registration deviation steps c) are repeated to e). Flat-bed punching and / or embossing machine (100), in particular for carrying out the register correction method according to one of claims 2-5 with a web feed (14) for feeding a web-shaped substrate (24), with a cross cutter (10) for severing the web-shaped substrate (24) into individual sheets (6, 7), with a flat bed punching and / or embossing station (12) and a sheet delivery (18, 20, 22) for depositing punched sheets (7),
characterized,
that in the web running direction (B) upstream of the cross cutter (10) and / or downstream of the Flachbettstanz- and / or is arranged an inspection system (30) -prägestation (12) for monitoring the web or sheet-like substrate to register errors (1000),
that between the Flachbettstanz- and / or -prägestation (12) and the sheet delivery (18, 20, 22) a switchable diverter (40) is arranged for the discharge of faulty sheet (6) and
in that a sheet storage device (50) adjoining the sheet diverter (40) is provided for receiving the discharged sheet (6). Flat bed punching and / or embossing machine according to claim 6,
characterized,
that the sheet storage device (50) is designed as a sheet cassette and in particular has a shredder. Flat bed punching and / or embossing machine according to one of claims 6 or 7,
characterized,
that the Bahnzufiihrung (14) has a web storage. Flat bed punching and / or embossing machine according to one of claims 6 to 8,
characterized,
in that the flatbed punching and / or embossing machine (100) is coupled inline with a web press (8) for printing on the web-shaped substrate (24). Flat bed punching and / or embossing machine according to one of claims 6 to 9,
characterized,
that the sheet delivery has a Fugitive unit (18) and / or a blank separating unit (20).

Images