TWI579127B - A method for trimming the die cutting tool, and a sheet die cutting station having a cover which can be sucked - Google Patents

Description

Method for trimming a die cutting tool and a sheet die cutting station having a cover that can be sucked Field of invention

The present invention relates to a method for trimming a die cutting tool according to claim 1 and a sheet die cutting station as described in claim 4, and a ninth application of the patent application. The platform type sheet die cutting machine described.

Background of the invention

Cutting with a closed geometry cutting die is referred to as "die cutting", which may be circular, elliptical or polygonal and any form of irregular shape. The processing carried out in the post-press processing, such as die cutting, chamfering and index die cutting using a punch, also belongs to the field. Die cutting is achieved towards a die-cut pad or towards the punch, in part also a shearing process. Packaging materials made of paper, cardboard, cardboard or corrugated paper are mainly die cut in sheet sizes. Materials such as foils (in-mold), various thin plastics or aluminum foils can also be treated accordingly. Stripe lines or arches may additionally be applied to the useful portion during the die cutting process. This complicated processing makes it absolutely necessary that the sheets are individually die cut. Because the final product involves packaging that has extremely high requirements in the implementation of technology and graphics (for packaging for cosmetics, cigarettes, pharmaceuticals, food, etc.), it not only imposes special requirements on the packaging material itself, but also for the best The result is a die cutting tool with minimal tolerances and an extremely precise and reliable die cutting machine. The platform die cutting machine best meets these requirements. Here, sheets that have been printed and stacked on the pallet are supplied to the die cutter. In this machine, the sheets to be die-cut are precisely oriented in an orienting device, received by the pick-up vehicle and accurately positioned in the die-cutting device in a fixedly supported lower platform and through the toggle or eccentric The transmission moves vertically between the upper stages. Alternatively, some machines are disclosed in which the upper stage is fixed and the lower stage is moved relative to the upper stage for the die cutting process.

It is well known in the art of sheet-cutting and embossing machines which are used for die-cutting, stripping, embossing and storing sheets made of paper, cardboard and the like, the sheets are by means of 叼The picker moves through the various stations of the machine. A corresponding picker truck has a picker bridge to which the picker is secured, the picker gripping the front end of the sheet. The picker truck also has a laterally driven vehicle that is coupled to the loop train of the conveyor system and thereby moves the picker truck through the machine. By means of the movement of the sheets through the machine, successive operations of the stations, in particular the die cutting stations, the stripping stations and the useful partial separation stations, are provided successively in succession.

Such a platform type die cutting station is known, for example, from DE 30 44 083 A1. The two stations are equipped with cutting and grooving tools or corresponding mating tools for punching the useful portion from the tabs that are introduced into the table between the beats and simultaneously pressing the grooves required for the neat folding. The waste is mechanically removed by a stripping tool in a subsequent stripping device. Depending on the configuration of the machine, it is finally possible to separate the useful portion of the punch out in the useful partial separation device provided for this purpose. In order to obtain a high-quality product, the die-cutting pressure in the sheet-cutting-and-pressing press must be matched according to the sheet to be processed.

This is achieved by the movement of the wedge-shaped steel plate as described in DE 30 44 083 C3. The steel plate is located between the eccentric shaft and the driven upper stage. through The movement of the wedge-shaped steel plate changes the spacing between the moving upper stage and the fixed lower stage and thereby changes the die-cutting force.

According to the prior art, the common point of the different means for adjusting the die-cutting force is that the die-cutting force can only be adjusted globally, that is to say, the entire face of the pressure plate. However, according to the prior art, in all die-cutting and stamping presses, there are unequal die-cut forces on the face of the platen due to structural constraints. The die cutting force is introduced through a single force introduction point and thus does not act on the entire platen surface. The deformation of the upper and lower stages is obtained according to the stiffness of the pressure plate, which in turn causes unequal die-cut pressure distribution on the face of the pressure plate. The difference in height of the die-cutting or grooving knives and the wear of the knives also cause unequal die-cut pressure distribution. The unequal die cutting pressure in turn causes an irregular cutting of the cutting blade of the die cutting tool. According to the prior art, the problem is solved by individually installing a die cutter. Depending on the deviation of the rated die-cutting force, the die cutter is glued to the back of the tool using strips or strips of different thickness. The dressing mentioned here is very time consuming and must be achieved when the machine is shut down. The trimming can last for many hours depending on the number of die cutters and the shape to be die cut. High setup times result in small machine yields.

Here, the process in trimming the die cutting tool is generally as follows: after the test sheet is die cut and it is possible to identify at which portions need to be trimmed, the die cutting tool is pulled out from the sheet die cutting station, manually The cover supported on the dieboard is removed and set aside. This allows the dieboard to be accessed and the strip can be glued behind it or the contoured trim sheet can be placed behind it. After finishing the dressing, the cover is again placed on the dieboard and the die cutting tool is pushed back into the die cutting station. Disadvantages of this process according to the prior art Yes: The cover needs to be operated manually. In the case of large format die-cutters, the cover is not lightweight and heavy, which is a burden for the machine operator. A further disadvantage is that it takes time to manually operate the cover. A further problem is the storage of the cover during the dressing process, since the cover must be securely placed here in order to avoid damage to the plate. The cover plate must be easily removable so that it can be easily replaced when worn and thus the cover plate can simply be removed when the die cutting station is used for hot stamping to provide a structural space for the hot stamping unit.

Summary of invention

SUMMARY OF THE INVENTION It is therefore an object of the invention to describe a method for trimming a die cutting tool and to provide a sheet die cutting station and a platform type sheet die cutting machine, wherein the disadvantages of the prior art are respectively reduced and die cutting can be achieved. The tool is not too troublesome to trim.

The task is solved by a method having the features of claim 1 of the patent application, by a sheet die-cutting station having the feature of claim 4, and by a platform-type sheet die-cutting machine having the feature of claim 9 of the patent application.

The method of the present invention is used to trim a die cutting tool of a sheet die cutting station, the sheet die cutting station having an upper stage and a lower stage. The sheet die cutting station is part of a platform sheet die cutting machine. The die cutting tool has a die cutting plate and a cover plate placed on the die cutting plate, and the die cutter is fixed to the die cutting plate. According to the invention, in order to trim the die cutting tool, the following steps are carried out: in a first step, a die cutting of a test sheet is carried out in the sheet die cutting station, wherein the test sheet can be evaluated and Thereby evaluating the trimming needs. With The fixing of the cover plate is then performed on the upper stage. The dieboard can then be removed from its working position between the upper and lower stages into a trim position, while the cover is held in the sheet die cutting station in its position below the upper stage . In an advantageous manner, the die cutting plate can be brought into immediate contact after removal and the dressing plate can be finished without having to remove the cover plate as is conventional in the art. After the dieboard has been trimmed, the dieboard can again be moved back into its working position and the die cutting tool is ready for use. The fixing of the cover is then either cancelled or the fixing of the cover is maintained even during the die cutting process.

In an advantageous embodiment variant, the fastening of the cover on the upper table is carried out by mechanical clamping and/or by hydraulic clamping and/or by magnetic holding and/or by pneumatic holding. In this case, different clamping or holding principles can be used instead or in addition to one another.

In a particularly advantageous and thus preferred embodiment variant, the fastening takes place by pneumatic holding and for this purpose a vacuum is applied to the cover. This embodiment variant has the advantage that it is not necessary to use any additional mechanical parts requiring structural space compared to mechanical clamping and that it is not necessary to arrange any hydraulic lines compared to hydraulic clamping and to allow for the cover compared to magnetic holding. The plate material is fixed irrespective of it. An additional advantage is obtained when a negative pressure generator or a negative pressure source already exists in the sheet die cutting station, as it can be used for other functions.

The invention further relates to a sheet die-cutting station for a platform-type sheet die-cutting machine, which is particularly suitable for carrying out the method described above. The sheet die cutting station has an upper pressing plate and a lower pressing plate, wherein one of the two pressing plates performs a stroke movement, A die cutting tool is coupled to the upper platen. The die cutting tool has a die cutting plate and a cover plate disposed between the die cutting plate and the upper pressing plate, the die cutting plate having a die cutter. According to the invention, the upper platen is provided with a suction opening and the sheet die-cutting station has a negative pressure source or a negative pressure generator, and the negative pressure source or the negative pressure generator passes through the pipeline and the upper platen The suction opening is connected. In this way, the cover plate can be sucked during the dressing of the die cutting tool, that is to say, in other words: the suction air is supplied by the vacuum source or the vacuum generator, by means of the suction Air, the cover plate can be held in its position under the upper platen even during the trimming. The die cutting plate is not subjected to suction forces here and can be pulled out of its working position between the upper pressure plate and the lower pressure plate without problems for finishing. Advantageously, the suction opening is arranged in the upper pressure plate such that a suction force acts only on the cover plate.

In an advantageous further development, the die cutting plate is held by a closed frame, which allows simple handling and allows simple positioning of the die cutting plate.

In an advantageous further development of the sheet die cutting station according to the invention, the vacuum source or the vacuum generator can also provide suction air on the lower pressure plate for the die cutting Suck a slice in the process.

In an advantageous further development of the sheet die cutting station according to the invention, the sheet die cutting station has a machine control device and an operator interface to control the suction air. Thus, for example, it can be determined by the machine operator whether the cover should remain in the sheet die-cutting station during the finishing process or whether the cover should be removed together with the die-cutting plate.

The invention also relates to a platform type sheet die cutting machine having the above A sheet die cutting station for carrying out the method for trimming a die cutting tool as described above.

The described invention and the described advantageous further developments of the invention can also form an advantageous further development of the invention in any combination with one another.

The additional advantages of the invention, as well as the structural and functionally advantageous configurations, are described in the dependent claims and the description of the embodiments with reference to the drawings.

Simple illustration

The invention is explained in more detail below by means of a preferred embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a platform type sheet die-cutting machine of the present invention, FIG. 2a is a state of being trimmed according to the prior art, and FIGS. 2b to 2d are conditions at the time of trimming according to the present invention. .

Elements and members corresponding to each other in the drawings are provided with the same reference numerals.

Figure 1 shows the principle of a sheet die-cutting-and-pressing machine 100 for die cutting, stripping, useful partial separation and storage of sheets made of paper, cardboard, plastic and the like. structure. The die-cutting and embossing machine 100 has a refilling device 1, a die-cutting station 2, a stripping station 3, and a receiving device 4 having a storage-and useful portion separation station, which are carried by a common machine housing 5 and It is surrounded and driven by the main drive 17. The processing stations 2, 3, 4 can be accessed from one side, the so-called operating side; the drive system of the sheet die-cutting-and-pressing press 100 is situated on the opposite side, the so-called driving side. a machine control device 15 control The flow inside the die cutting machine 100 is prepared.

The sheet 6 is divided into a single sheet from a stack by a refill device 1 and supplied to the sheet conveying system 7 and grasped by the picker attached to the picker bridge of the picker cart 8 and The stations 2, 3 and 4 of the die-cutting-and-pressing machine 100 are intermittently drawn along the sheet conveying direction B.

The sheet conveying system 7 has a plurality of picker carts 8, so that a plurality of sheets 6 can be processed simultaneously in the respective stations 2, 3 and 4. The picker truck 8 can also be driven by a chain drive or, in an alternative embodiment, by an electromagnetic linear drive with a traveling wave field motor, as described, for example, in DE 20 2007 012 349 U1.

The die cutting station 2 comprises a lower pressing plate, a so-called lower stage 9 and an upper pressing plate, a so-called upper stage 10. The upper stage 10 is supported vertically reciprocally and is provided with an upper tool 30 with a die-cutting and slotting knife. The lower table 9 is fixedly supported in the frame and is provided with a mating plate 20 that cooperates with the die-cutting and slotting blades. Alternatively, it is also possible to bring the upper stage 10 to rest and move the lower stage 9. In the case of embossing, embossing tools are used instead of die-cutting and grooving tools, in particular embossing tools in the form of so-called embossed reliefs.

The picker cart 8 transports the sheet 6 from the die-cutting and stamping station 2 to a subsequent stripping station 3, which is equipped with stripping tools 21, 23. In the stripping station 3, the unwanted scrap section 11 is punched down from the sheet 6 by means of the stripping tools 21, 23, whereby the scrap section 11 is dropped onto the cart container 12 pushed under the station. in.

The sheet 6 arrives from the stripping station 3 in the receiving device 4, where the sheets 6 are either simply stored or simultaneously separated from the respective useful portions of the respective sheets 6. To this end, the receiving device 4 has a useful partial separation tool 21, twenty three. The receiving device 4 can also comprise a pallet 13 on which a single sheet 6 or useful portion is stacked in the form of a stack 14 so that after having reached a defined stack height, the sheet stack 14 can be The pallet 13 is removed from the area of the die-cut-and-press 100. In order to allow the machine 100 to not have to be shut down during the replacement stack, an auxiliary stacking device can be employed.

Figure 2a shows the situation when trimming according to the prior art. In order to be able to trim the die cutting plate 31, the die cutting tool 30 is removed from the die cutting station 2 in the direction a from the working position between the upper table 10 and the lower table 9 of the die cutting station 2. In order for the back side of the die cutting board 31 to be accessible and to be glued or to be applied to the trim sheet, the cover panel 32 must be removed and set aside as indicated by arrow e.

The situation when trimming in accordance with the present invention is illustrated in Figures 2b to d. For this purpose, the upper table 10 is provided with a suction opening 41 which is connected via a line to a vacuum generator or a vacuum source 40. Suction air is thus provided on the suction opening 41, which causes a suction force S on the cover. If the die cutting plate 31 should be trimmed, the suction air is activated and a suction force is applied to the cover plate 32. The cover plate 32 is thus pulled onto the upper table 10 and held there in its position. The die cutting plate 31 can then be pulled out of its working position between the upper table 10 and the lower table 9 in the direction of the arrow a. Since the cover plate 32 remains in the die cutting station 2 in its position directly below the upper table 10, the back side of the die cutting plate 31 can be brought into immediate access and the machine operator can remove the cover plate 32 without having to remove the cover plate 32. Start the trimming. Thereby, the dressing belt 33 can be simply adhered and the trim sheet (not shown) can be simply placed.

As shown in Fig. 2d, in the case of corresponding control by the control device 15, the suction force may remain unactivated when the die cutting tool 30 is moved out of a, so that the die cutting plate 31 and the cover plate can be made if desired. The 32 is removed together, for example when the cover 32 present in the die cutting station 2 should be replaced by another cover 22.

1‧‧‧ Refilling device

2‧‧‧ Die-cutting and/or stamping stations

3‧‧‧disposal station

4‧‧‧ Receiving device, with useful partial separation station if necessary

5‧‧‧ machine housing

6‧‧‧ pages

7‧‧‧ Sheet conveying system

8‧‧‧ Picker truck with picker

9‧‧‧Under/lower plate

10‧‧‧Upper/Upper Platen

11‧‧‧ scrap section

12‧‧‧ Container

13‧‧‧ pallet

14‧‧‧ receiving stack

15‧‧‧Control device with interface and input device

16‧‧‧Supply table with units for aligning sheets

17‧‧‧Main drive

20‧‧‧ Tools

21‧‧‧Upper tool with punch

22‧‧‧ Cover

23‧‧‧Useable partial separation grille or stripping bed (lower tool)

30‧‧‧Upper tool (die cutting tool)

31‧‧‧Mold cutting board with die cutter

32‧‧‧ Cover

33‧‧‧Finishing/Finishing Sheets

40‧‧‧Negative pressure generator

41‧‧‧ suction opening

42‧‧‧pipe

100‧‧‧Platform sheet die-cutting and/or-embossing machine (die cutting machine)

A‧‧‧ removal of die cutting tools

e‧‧‧Removal of the cover

B‧‧‧ sheets conveying direction

E‧‧‧ sheet conveying plane

S‧‧‧ suction

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a flatbed sheet die cutting machine of the present invention, Fig. 2a showing the state of being trimmed according to the prior art, and Figs. 2b to 2d showing the state of being trimmed according to the present invention.

10‧‧‧Upper/Upper Platen

31‧‧‧Mold cutting board with die cutter

32‧‧‧ Cover

33‧‧‧Finishing/Finishing Sheets

40‧‧‧Negative pressure generator

41‧‧‧ suction opening

A‧‧‧ removal of die cutting tools

S‧‧‧ suction

Claims (9)

A method for trimming a die cutting tool of a sheet die cutting station, the sheet die cutting station having a top plate and a lower table of a flat sheet die cutting machine, wherein the die cutting tool has a die a cutting plate and a cover plate having a die cutter, the method having the steps of: a) die cutting a test sheet in the sheet die cutting station; b) using the cover sheet Fixed on the upper stage; c) removing the die cutting plate from its working position between the upper stage and the lower stage into a trimming position; d) trimming the die cutting board; and e) placing the die The cutting board is moved into its working position. The method for trimming according to claim 1, wherein the fixing step in step b) is carried out by mechanical clamping and/or hydraulic clamping and/or magnetic holding and/or pneumatic . The method for trimming according to claim 2, wherein the fixing step in step b) is carried out by pneumatic holding and a negative pressure is applied to the cover. A sheet die cutting station for a platform type sheet die cutting machine, in particular for carrying out the method according to claim 3, wherein the sheet die cutting station has an upper pressing plate and a lower pressing plate, the pressing plates One of the sheets is liftable, and the sheet die cutting station further comprises a die cutting tool connected to the platen and a die cutting plate and a cover plate provided with a die cutter, wherein the cover plate Provided between the dieboard and the upper platen, The upper pressure plate is provided with a suction opening and the sheet die-cutting station is provided with a negative pressure source or a negative pressure generator, and the negative pressure source or the negative pressure generator is connected to the A suction opening of the upper platen for absorbing the cover during trimming of the die cutting tool, wherein the dieboard does not suffer from suction. The sheet die cutting station of claim 4, wherein the suction opening is disposed in the upper platen such that a suction force acts only on the cover plate. The sheet die cutting station of claim 4, wherein the die cutting plate is held by a closed frame. The sheet die cutting station of claim 4, wherein the negative pressure source or the negative pressure generator provides suction air on the lower platen to suck a die slice. The sheet die cutting station of claim 4, wherein the sheet die cutting station has a machine control device and a user interface for controlling the suction air. A platform type sheet die cutting machine having a sheet die cutting station according to any one of claims 4 to 8.