TOOL AND METHOD FOR PRODUCING A BLANK FROM A CARDBOARD SHEET

Abstract

The invention relates to a tool for producing a blank from a cardboard sheet, having a first tool part with at least one cutting line contour, by means of which at least one scrap part is separable from the blank, and having a second tool part, which cooperates with the first tool part to separate the blank from the at least one scrap part. In order to be able to remove relatively small scrap parts from the punching process in a particularly quick and easy manner, at least one suction duct of a suction device is provided in the first tool part, the at least one scrap part being able to be extracted by suction via said suction duct. The invention furthermore relates to a method for producing a blank from a cardboard sheet.

Claims

1. A tool for producing a blank from a cardboard sheet comprising: a first tool part with at least one cutting line contour, by means of which at least one scrap part is separable from the blank, and a second tool part, which cooperates with the first tool part for separating the blank from the at least one scrap part, wherein at least one suction duct of a suction device is provided in the first tool part, via which the at least one scrap part can be sucked off.

2. The tool according to claim 1, wherein the suction duct is formed by the cutting line contour at least over a length area.

3. The tool according to claim 1, wherein the first tool part comprises at least one support plate, in which the suction duct is formed at least over a length area.

4. The tool according to claim 3, wherein the first tool part comprises at least one support plate, in which the cutting line contour is accommodated.

5. The tool according to claim 4, wherein the first tool part comprises an intermediate plate, in which the suction duct is formed at least over a length area, between the support plate in which the cutting line contour is accommodated, and the support plate in which the suction duct is formed at least over a length area.

6. The tool according to claim 1, wherein the suction duct is formed by respective partial suction ducts over a length area.

7. The tool according to claim 6, wherein the cutting line contour comprises at least one circumferentially closed contour area for separating a respective scrap part, wherein the suction duct or partial suction duct respectively adjoining thereto is formed larger in cross-section than the associated contour area.

8. The tool according to claim 3, wherein the suction duct includes a final duct, which exits from the corresponding support plate towards both sides, wherein a suction element of the suction device is connected to the one side of the final duct and a free inflow opening is provided on the other side of the final duct.

9. The tool according to claim 8, wherein the final duct is arranged on an outer side of the corresponding support plate, at which a frame sheet is arranged.

10. A method for producing a blank from a cardboard sheet by means of a tool, in which at least one scrap part is separated from the blank with a cutting line contour of a first tool part by cooperation with a second tool part, wherein the at least one scrap part is sucked off via at least one suction duct of a suction device provided in the first tool part.

11. The method according to claim 10, wherein the suction duct is formed by respective partial suction ducts via a length area and the at least one scrap part is sucked off via at least one partial suction duct.

Description

[0020] Below, an embodiment of the invention is explained in more detail based on the drawings. There show:

[0021] FIG. 1 a schematic sectional view to a tool for producing a blank from a cardboard sheet;

[0022] FIG. 2 a schematic plan view to an upper support plate of the first, upper tool part along a sectional plane represented by a line II-II in FIG. 1; and in

[0023] FIG. 3 a representation of the tool in the area of the cutting line contour in sections and enlarged with respect to FIG. 1.

[0024] In FIG. 1, a tool for producing a blank not illustrated from a cardboard sheet also not illustrated is shown in a schematic sectional view. The tool here formed as a combined cutting, punching and grooving tool basically includes a first, upper tool part 10 in the manner of a female mold and a lower tool part 12 in the manner of a male mold. Respective cardboard sheets for producing corresponding blanks in a continuous process can be introduced between the two tool parts 10, 12, wherein the separation of scrap parts and the introduction of folding grooves in a manner described in more detail below are effected by a relative movement of the two tool parts 10, 12 relative to each other, predominantly by moving the first tool part 10 relative to the second tool part 12. Presently, the tool is illustrated at least partially open.

[0025] The upper tool part 10 is composed of a lower support plate 14 and an upper support plate 16 with interposition of an intermediate plate 18. Moreover; a frame sheet 20 is provided on the upper side of the upper support plate 16. All of the plates 14 to 18 are accommodated and clamped with each other in a retaining device 22 with a lateral retaining frame 24.

[0026] In the present case, the lower support plate 14 is a multiplex support plate with a central, continuous recess 26, in which a cutting line contour 28 is inserted at least substantially identical in shape. Presently, the cutting line contour 28 is formed of a metal block and includes substantially three circumferentially closed contour areas 30, by means of which respective scrap parts (not illustrated) arranged parallel to each other are separable from the cardboard sheet or blank. Accordingly, of the cutting line contour 28, six cutting areas 32 of the corresponding cutting line are illustrated in the present sectional view. Towards the top, the metal block of the cutting line contour 28 terminates flush on the top side of the lower support plate 14 and on the bottom side of the intermediate plate 18, respectively, on which the cutting line contour 28 supports. For this reason among other things, the intermediate plate is configured of a steel material with a hardness of for example about 50 HRC.

[0027] Besides the central recess 26 for the cutting line contour 28, the lower support plate 14 includes further recesses for respective lateral cutting lines 34 for separating the blank from a large scrap part as well as a respective grooving line 36 arranged inside thereof for generating a folding groove in the blank.

[0028] The lower tool part 12 presently includes substantially a counter plate 38, which cooperates with the cutting line contour 28, the respective cutting line 34 and the respective grooving line 36 such that the desired cuts of the scrap parts and folding grooves arise. Hereto, corresponding grooves 40 for cooperation with the grooving lines 36 are provided in the counter plate 38.

[0029] Presently, to the three circumferentially closed contour areas 30 formed by the cutting line contour 28 for separating the respective scrap part, a suction duct 44 formed by the three partial suction ducts 42 in this area adjoins. The partial suction ducts 42 or the suction duct 44 formed hereby thus extend within the cutting line contour 28 towards the top up to the intermediate plate 18, in which the partial suction ducts 42 are continued identical in shape. Starting from the intermediate plate 18, the partial suction ducts 42 extend over a length area in vertical direction within the upper support plate 16 until they open into a final duct 46 of the suction duct 44.

[0030] Therein, the progression of the final duct 46as well as the shape of the partial suction ducts 42is particularly beneficially apparent from FIG. 2, which shows the upper support plate 16 in a schematic plan view along the sectional plane represented by the line II-II in FIG. 1. Herein, it in particular becomes apparent that the final duct 46 exits from the corresponding support plate 16 towards both sides 48, 50, wherein a non-illustrated suction element of a suction device is connected to the one side 48, 50 of the final duct 46, and a free inflow opening 52 is provided on the other side of the final duct 46. Therein, the suction element of the suction device is for example connected to a subsequent further suction duct 54 of the suction device, which extends in the retaining frame 24. Thus, a continuous suction airflow can be generated within the final duct 46 from the inflow opening 52 towards the suction element, thus from the one to the other side 48, 50 of the support element 16, by means of the suction device.

[0031] It is clear that the airflow within the final duct could be generated not only by suction, but also by blowing air in on the one side 48, 50. By such a blown-in airflow, thus, a suction effect of the suction device can also be achieved at the contour areas 30 of the cutting line contour 28 and within the partial suction ducts 42, respectively.

[0032] The force of this suction airflow furthermore acts over the partial suction ducts 42 until in the area of the respective contour areas 30 of the cutting line contour 28, by means of which the respective scrap parts are separated from the blank. Therein, the scrap parts are pressed into the partial suction ducts 42 in punching and cutting, respectively, and transported further upwards to the final duct 46 by the suction airflow, from where the further evacuation is effected via the suction device.

[0033] In order to achieve a particularly beneficial suction of the scrap partsas it is in particular apparent from FIG. 3 based on a sectional representation of the tool enlarged with respect to FIG. 1 in the area of the cutting line contour 28the partial suction ducts 42 are formed larger in cross-section than the associated contour areas 30 of the cutting line contour 28. For this reason, double lines are also apparent in the area of the partial suction ducts 42 in the plan view of FIG. 2, since a respectively inner line shows the respective contour area 30 of the cutting line contour 28.

[0034] In synopsis of FIGS. 1 and 2, it is additionally apparent that the final duct 46 is provided on an outer side 56 of the corresponding support plate 16. Thus, it can be particularly simply produced in that it is closed by the frame sheet 20 towards the top. The upper support plate 16 is presently formed of an aluminum alloy, which allows simple processing.

[0035] Thus, it is overall apparent that a method can presently be provided, in which at least one scrap part can be separated from the blank with the cutting line contour 28 of the first tool part 10 by cooperation with the second tool part 12, which is herein pressed to the rear and to the top into the corresponding partial suction duct 42, respectively, and is sucked off from here via the suction duct 44.

[0036] The present tool can in particular be employed for processing material sheets of paper or cardboard in thicknesses between 80 g/m.sup.2 and 500 g/m.sup.2 or with a material thickness between about 80 m and 700 m, Herein, the material sheets can in particular also be both printed and varnished and coated with a polymer layer or with a plastic film. Similarly, the material sheets can have a coating with a metal film, for example of an aluminum material, Of course, combinations of the described materials can also be employed in a corresponding material sheet. Finally, the material sheets can also be formed of a laminate or have a composite structure.

LIST OF REFERENCE CHARACTERS

[0037] 10 tool part [0038] 12 tool part [0039] 14 lower support plate [0040] 16 upper support plate [0041] 18 intermediate plate [0042] 20 frame sheet [0043] 22 retaining device [0044] 24 retaining frame [0045] 26 recess [0046] 28 cutting line contour [0047] 30 contour area [0048] 32 cutting area [0049] 34 cutting line [0050] 36 grooving line [0051] 38 counter plate [0052] 40 grooves [0053] 42 partial suction ducts [0054] 44 suction duct [0055] 46 final duct [0056] 48 side [0057] 50 side [0058] 52 inflow opening [0059] 54 suction duct [0060] 56 outer side