DE102007033544A1 - Procedure for the separation of printable sheet, comprises rotatively punching the sheet in printing machine into usable blank and waste component and connecting the usable blank and the waste component with one another at support points - Google Patents

Abstract

The procedure for the separation of a printable sheet (4), comprises rotatively punching the sheet in a printing machine into a usable blank (5) and a waste component (3), connecting the usable blank and the waste component with one another at support points, which are produced by discontinuities of a punching contour (1), splitting the support points, within the printing machine or in a post-processing unit that is linked to the printing machine by laser cutting using a laser device and then separating the usable blanks and the waste components from one another. The procedure for the separation of a printable sheet (4), comprises rotatively punching the sheet in a printing machine into a usable blank (5) and a waste component (3), connecting the usable blank and the waste component with one another at support points, which are produced by discontinuities of a punching contour (1), splitting the support points that connect the usable blanks and the waste components, within the printing machine or in a post-processing unit that is linked to the printing machine by laser cutting using a laser device and then separating the usable blanks and the waste components from one another. The usable blanks are separated from the waste components after splitting the support points. The waste component is removed from the production flow and disposed and the usable blanks are stacked up or led to another point of application by a conveying means. The printable sheet is inspected before or after the punching process by an image inspection system and/or color measuring device. Control signals for the laser-cutting device are obtained, such that the separation of the support points takes place only if each of the usable blanks is evaluated as defect-free by the image inspection system and/or the color measuring system. The usable blanks that are evaluated by the image inspection system and/or the color measuring system as defective, remain connected with the waste component by the support points in the punching contour and are disposed together. The waste margin of the printable sheet that remains after the punching out of the usable blanks, is transported to a staple of the sheet delivery of a printing machine or deflected by a curved sorting means. A signal is triggered for the removal of one or more sample sheet from the printing machine. The separation of the printable sheet is interrupted as a consequence of the signal for the number of sample sheets to be withdrawn. An independent claim is included for a device for the separation of a printable sheet.

Description

The The invention relates to devices for crop separation and a method for separating a rotatively punched sheet in at least one Good and in a waste part.

It is known to benefit in the printing press from a sheet to punching, with the benefits with some breakpoints with the later waste part of the Press sheets are connected to the onward transport of the sheet with the stamped benefits in the delivery of a sheetfed press to ensure. The disadvantage of this method is that the good part with relatively many or large breakpoints at the later Waste part must be attached so that the benefits during transport over cylinder groups due to the curvature while not transport of later Waste part dissolves. Many breakpoints have the disadvantage that the later separation is later consuming in a good and a waste part. Besides, they are Breakpoints at the folding box edges later often aesthetic establish undesirable.

The EP 1 283 765 B1 describes therefore an apparatus and a method for separation into a good and a waste part, in which the rotary punching tool is integrated in the sheet entrance of a sheet delivery of a sheet-fed press. By this arrangement is to be avoided that the punched sheet undergoes curvature, but is transported as possible horizontally without mechanical stress in the delivery of the sheet-fed press. The EP 1 283 765 B1 is to be regarded as a generic representative for applications of inline stamping and inline embossing within printing presses, in particular for cutting and punching of printed cardboard, cardboard packaging, corrugated cardboard, paper or similar sheet-like substrates by means of a rotary die, in which the substrate in the feed direction between two rotating processing rolls is insertable and undergoes its processing when passing through the working gap effective tool parts, in which the substrate is divided into at least one waste part and at least one good part, wherein a processing roller is provided with at least one gripper for the register-oriented transport of the sheet-shaped substrate, characterized in that means for spreading and separating the good part of the waste part at the discharge end of the working gap is provided. The waste part is held by the gripper and removed from the Arbeitsgalt. A disadvantage of these and similar devices and methods is that complex redesigns are required because it can not fall back on given cylinder groups in the printing press. Thus, this device and method is only economical if a printing machine with such a device with corresponding orders has a high utilization.

It is also known laser devices for the. Processing of substrates to use within printing presses. The DE 26 14 941 describes a laser cutting device for sheet material, which separates the sheet longitudinally in at least two partial sheets. In this case, the laser longitudinal separation device is assigned to either the sheet delivery or a drum of a printing press. Described here but only methods for separating or perforating the sheets in the printing press, the punching or separation of individual benefits is not part of this patent.

The DE 44 42 411 discloses an apparatus for inline paper processing in a printing machine, wherein the geometry data are provided in digital form, which in turn drive the processing tools, preferably laser devices. This allows inline paper processing in the printing press over the entire printing or paper width with freely configurable and changeable processing geometries. The disadvantage of this solution found is that very powerful and very fast laser must be used to cut out the complete punching contour from the sheet. In folding carton printing, signatures are printed with sheetfed printing at a speed of approx. 5 m / s, whereby each signature usually has several benefits. In this case, the laser device would have to have a laser cutting speed of a multiple of 100 m / s or, alternatively, several lasers would have to be used in parallel. Both approaches make the economics of this process questionable for the manufacture of folding carton benefits.

In addition, can with a pure laser application only a Pseudorillung to facilitate the later Folding the folding carton benefits by making multiple notches With the laser into the folding box material are scratched. Such Notching is often undesirable and creates hard edges at the fold, which often leads to an ugly break or tear on the Faltschachtelaußenkante generated while one with a mechanical imprint a grooving with a scoring tool produces a bulge inward or outward, which helps to avoid cracking in general.

task The invention is the blank separation on during the passage through the printing press rotatively stamped sheet in at least to allow a good and a waste part.

Is solved the invention with the features according to claim 1.

advantageous Further developments of this approach emerge from the dependent claims.

According to the invention separating the benefits from the bow into at least one good and at least one a waste part spatially separated.

Of the Sheet is made according to a Beneficial contour punched in rotation within the printing press. in this connection be one or more printing cylinders, one or more cylinders a coating unit each provided with a punching plate or special punching cylinder used.

Likewise may be a corresponding to these cylinders counter-pressure cylinder wear a punching plate.

The Stamping plate can be etched from metal and milled will. The punching plate may have a carrier plate, in the Punching knives were attached. The corresponding cylinder points if appropriate, a counterform, a protective plate or protective film, wherein the punching plate have at least cutting lines, the Use contour corresponding.

The Cutting lines are interrupted in several places, so that breakpoints arise, the punched benefits with breakpoints on the or attach the waste part (s) to other uses, so that the Sheet with the stamped benefits continue in the press or transported in the sheet delivery of the printing press can, without the benefits of it being removed from the sheet or can be lost.

The Invention will be exemplified below with reference to a drawing shown. Here, the drawing shows in

1 a punching sheet with benefits.

1 shows a sheet 4 with a utility structure. The print sheet 4 is according to the benefit contour 1 punched in a rotary press inside a printing machine. This can be done with printing cylinders, cylinders of a coating unit or special punching cylinders. Likewise, the respective counter-pressure cylinder corresponding to one of the cylinders can carry a punching plate which has been etched or milled from metal, or which has a carrier plate in which punching blades have been fastened. The corresponding cylinder may optionally carry a counter-mold, a protective plate or protective film. However, the punching plate has at least cutting lines that the Nutzenkontur 1 correspond. The cutting lines are interrupted in several places, so that breakpoints (see 1 ) arise that the punched benefits with breakpoints (see 1 ) at one or more waste parts 3 or other benefits 5 Fasten. In this way, the sheet can 4 with the pinned benefits 5 continue to be transported in the printing press or in the sheet delivery of the printing machine without any benefit 5 during transport from the sheet 4 dissolve and be lost.

The separation into at least a good part / benefit 5 and at least one waste part 3 then done by the good parts / benefits 5 from the sheet 4 be removed by only the breakpoints (see 1 ) are separated by a laser cut. The good parts / benefits 5 can then in the known methods of the or the waste parts 3 be separated.

The laser or the laser devices can be assigned to a printing cylinder, a forme cylinder, a sheet guiding cylinder or the sheet delivery of the printing press. Furthermore, the laser can be assigned to a further transport system, for example a conveyor belt, which supports the printed sheet 4 with the or the stamped benefits 5 transported directly out of the printing press. Furthermore, the laser device or devices can be associated with a further processing station, which is connected directly or via an intermediate buffer, for example a paternoster system, to the printing press.

The separation into at least a good part / benefit 5 and at least one waste part 3 by the separation of breakpoints (see 1 ) can be done by a laser, which is located inside or outside the space of the printing machine, wherein the light beam (laser beam) via at least one fast optics can be focused or deflected (laser scanner). Alternatively, a plurality of laser units may be arranged over the width of the printing press, each of which has only a partial area of the printed sheet 4 cover.

The laser beam or beams are only in the area of the breakpoints (see 1 ) is activated. The activation or deactivation can be effected by the controlled switching on or off of the laser, or by a corresponding deflection of a continuously operating laser beam in the direction of the printed sheet 4 out or away.

An advantage of the solution found is that the printed sheet 4 with the one or more stamped, with breakpoints (see 1 ) provide benefits 5 safely be transported through the press, without the unwanted separation of the good / benefits 5 from the waste part 3 before the safe storage of the printed sheet 4 befürch must be. This allows the physical separation of the punching operation in the printing press from the separation process in the printing press or in a post-processing device connected to the printing press. Therefore, the integration into existing printing machines is significantly simplified by the fact that the punching can be done eg in a printing cylinder and the separation into good parts / benefits 5 and waste parts 3 at another location, which allows easier integration of such a separator. A complete punching, for example in a printing unit, requires a comprehensive modification, since the waste parts 3 disposed of directly and the punched good / benefits 5 separated must be transported or collected. This means on the one hand a high design effort, on the other hand, such a solution limits the universal usability of a printing press.

Compared to in-line paper processing by appropriate control of laser devices for freely configurable and changeable processing, the solution found has the advantage that only a fraction of the laser energy must be used because not the entire benefit contour 1 but only the breakpoints contained there, the good parts / benefits 5 and waste parts 3 connect with each other, must be separated.

This allows the use of cheaper Laser, which has a moderate feed rate and a lower Laser power can have. When using a suitable, fast power optics for laser beam deflection, can the separation of the breakpoints by a laser device happen. It can also be technical or economic establish be useful to arrange several laser devices next to each other.

Another advantage of the solution found compared to the control of the entire benefit contour is that the grooving 2 a folding carton can be made mechanically, with the already mentioned advantages of the low risk of mechanical damage of the folded edges. The crease 2 can be done in accordance with the invention together with the punching process, or the creasing or punching process can be done in conjunction with two separate printing press cylinders. This has the decisive advantage that the grooving and the punching can be adjusted independently of each other.

Another advantage arises from the possibility of the benefits / good parts 5 only selectively separated from the sheet out. This is particularly useful when a sheet 4 was inspected during the sheet pass through the printing press, for example, with a line scan camera or an inline color measuring device and individual benefits as faulty, z. B. due to a pressure fault or an impermissible deviation from a setpoint specification was detected. If the coordinates of the error are passed from the inspection device or the color measuring device to the driving software of the laser device, the coordinates can be of use 5 be assigned, the laser is activated in good case (default) and disabled in case of error for this benefit remains. The erroneous benefit 5 then stay over the breakpoints (see 1 ) with the waste parts 3 connected and thus, now also as a waste part, together with the waste parts 3 be disposed of.

The inventive method can be further improved by a sheet 4 , by means of appropriate facilities to the good parts / benefits 5 was reduced when punching frame or waste frame is transported to the stack of the sheet delivery of the printing press. Alternatively, the punching frame or waste frame of the press sheet 4 be discharged by means of discharge device, such as a curved switch, from the transport path and stored in a waste receptacle.

Furthermore, the method for taking one or more test sheets, which are taken for quality control, be further developed. If test sheets are to be removed from the printing press, a corresponding signal is triggered by the operating personnel. As a result of the signal which is passed to the control of the laser devices, then the separation of the printed sheet 4 in good parts / benefits 5 and waste parts 3 interrupted. The interruption takes place for one or more printed sheets 4 , but at least the number of sample sheets to be taken.

1

Using the contour (Punching contour) with recessed stopping points

2

grooved line

3

waste part

4

sheet

5

Good part / benefit

Claims (11)

Method for separating a printed sheet which is rotationally punched in the printing press (US Pat. 4 ) into at least one good part / benefit ( 5 ) and in at least one waste part ( 3 ), where good / useful ( 5 ) and waste part ( 3 ) after the punching process via breakpoints caused by interruptions of the punching contour ( 1 ) are interconnected, characterized in that the separation of the good parts / benefits ( 5 ) and waste parts ( 3 ) takes place in a further working step within the printing press or in a post-processing unit connected to the printing press such that good parts / benefits ( 5 ) and waste parts ( 3 ) are then separated from each other. Method according to claim 1, printed sheet ( 4 ) into at least one good part / benefit ( 5 ) and in at least one waste part ( 3 ), where good / useful ( 5 ) and waste part ( 3 ) after the punching process via breakpoints caused by interruptions of the punching contour ( 1 ) are interconnected, characterized in that the breakpoints, the good parts / benefits ( 5 ) and waste parts ( 3 ), are separated in a further step in the printing machine or in a post-processing unit connected to the printing machine by means of a laser cut by at least one laser device and good parts / user ( 5 ) and waste parts ( 3 ) are then separated from each other. Method according to claim 1 or 2, characterized in that the good parts / benefits ( 5 ) of the waste (s) ( 3 ) after the separation of the breakpoints in the punching contour ( 1 ) are separated by means of a laser cut by a suitable device and the waste or parts ( 3 ) are removed from the production flow and disposed of, and the good parts / benefits ( 5 ) are deposited on a stack or fed via a conveyor for further use, Method according to claim 1 or 2, characterized in that the printed sheet ( 4 ) is inspected before or after the punching process by an image inspection system and / or color measuring device and from this control signals for the laser separating device are obtained, such that the separation of the holding points in the punching contour ( 1 ), the good parts / benefits ( 5 ) and waste parts ( 3 ) connect only if the individual benefit ( 5 ) was rated good by the image inspection facility and / or the color measurement facility. A method according to claim 1 or 4, characterized in that the value evaluated by the image inspection system and / or the color measurement system as a benefit ( 5 ) with the waste part (s) ( 3 ) over the breakpoints in the punching contour ( 1 ) remains connected and is supplied together with these disposal. Method according to one or all of the preceding claims, characterized in that one of the good parts / benefits ( 5 ) reduced punching frame (waste frame) of the printed sheet ( 4 ) is transported to the stack of a sheet delivery of the printing press or discharged by means of a curved switch from the transport path. Method according to one or all of the preceding claims, characterized in that for the removal of one or more test sheets from the printing press, a signal can be triggered, wherein as a result of the signal, the separation of the printed sheets ( 4 ) in good parts / benefits ( 5 ) and waste parts ( 3 ) is interrupted for one or more, but at least the number of test sheets to be taken. Device for carrying out the method according to claim 1, characterized in that for separating the good parts / benefits ( 5 ) and waste parts ( 3 ) A laser device is associated with a printing unit, a coating unit or a stamping unit of the printing press. Device for carrying out the method according to claim 1, characterized in that for separating the good parts / benefits ( 5 ) and waste parts ( 3 ) A laser device is associated with the boom of a printing press. Apparatus according to claim 8 or 9, characterized in that the separation over a laser device takes place, which has a corresponding fast Deflection optics features. Apparatus according to claim 8 to 10, characterized in that over the printing machine width a plurality of laser devices are arranged, each laser device only a portion of the punched sheet ( 4 ) assigned.