ES1060655U - Die for punching cardboard boxes. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Die for the punching of cardboard boxes, of the type constituted by a cylindrical or semi-cylindrical wooden core, in the case of a rotary die, or by a flat plywood board in the event that it is a flat die, with grooves in which are inserted cutting strips and deburring straps, the latter for fragmentation of the marginal and residual strip produced in each plate after the die-cutting of the boxes, characterized in that it incorporates, in correspondence with any of the cutting strips established in the core, in correspondence with the internal face of the cutting strips, and more specifically in correspondence with each point of each cutting strip on which converges a perpendicular strip, a support strut inserted in a slot of the wooden core, so that said support strut laterally immobilizes the cutting strip, preventing it from separating from the internal end of the corresponding perpendicular strip. (Machine-translation by Google Translate, not legally binding)

Description

Die for die cutting boxes paperboard.

Object of the invention

The present invention relates to a die, of the type used to punch a cardboard sheet, such as a corrugated cardboard sheet, used for obtaining self-assembling boxes, such as those used in the packaging of fruit and vegetable products and the like.

The object of the invention is to achieve a die in which there is no occurrence of gaps between the unions of the strips, both in the areas of deburring and in the rest of the areas of the die and both axially and in the direction longitudinal when it comes to a rotary die or in the direction of the clamp socket when it is a flat die, to prevent straps from opening due to mechanical fatigue, lengthening from the useful life of said die is very considerable, with some optimal results in terms of cutting quality.

The invention is especially applicable to rotary dies, but is equally applicable to dies blueprints.

Background of the invention

In the field of punching cardboard boxes they use rotary dies with a cylindrical core, of wood, in which are conveniently inserted a series of strips longitudinal and transverse, determining ones of lines of cutting and other folding lines, obtained continuously properly cut, perforated and weakened cardboard sheets to be able to assemble two boxes.

The iron or plates from which it starts for Obtaining the boxes are perimetrically oversized with regarding the cut lines to practice on them, specifically with respect to the perimeter lines, so that in the die cut disposable marginal strips are defined that, for prevent them from clogging the die cutter machine they fragment into very small pieces by using strapping Deburring margins, which ensures that this waste falls towards a lower conveyor belt that eliminates them, without negatively impact the optimal functioning of the die

The strips, both of the areas of deburring and in the rest of the die zones, they must be contactors with other marginal cutting strips, for example, to get that the deburring strips are perfectly fragmented. This intimate connection between strips, which occurs when the die Rotary is new, it is lost over time, fundamentally because the tangential work of the strips results in a some slack of them with respect to the wood core in the that are inserted, which brings with it that between the end inside a strap, for example deburring, and the outer face of the other strap, for example of cutting, is produced by fatigue mechanical, a small slot that is enlarged by the introduction of small cardboard waste inside it that continuity is lost between the marginal cutting of the plate and the cross section for fragmentation of the deburring strip, or which is the same, said deburring strip does not fit perfectly fragmented but the different sectors defined in it they are joined by the ends, which creates functional problems in the die cutter.

This problem is also extensive, although with less intensity, to flat dies.

Description of the invention

The die proposed by the invention has been conceived and structured in order to fully resolve The problem described above is satisfactory.

To do this, more specifically and from the  basic structuring of any conventional die of this type, that is to say from the existence of a cylindrical core or wooden semi-cylindrical, or a flat wooden board plywood, in which there are partially inserted strips of cutting and deburring strips, the invention focuses on the fact of that on the mentioned wood core, in a situation of maximum proximity to each marginal cutting strip, in correspondence with the inner face of it and in a position of confrontation with each Deburring strap is placed a support strut, properly inserted in the wood core, which prevents displacement or tilting side of said cutting strip in the direction of tending to separate of the corresponding deburring strip, which eliminates substantially the risk that the groove may form previously cited between both bands.

In addition, in correspondence with the The outer end of each deburring strip is a piece of statement also inserted in the core of the wood that longitudinally immobilizes said deburring strip and that, in consequently, it has just determined the absence of risk of separation between cutting strip and deburring strip.

This same embodiment would be perfectly applicable to any strap that needs more support thus avoiding its possible slack caused by fatigue mechanics to which it is subjected.

The affirmation piece materializes in a simple rectangular plate, which is arranged transversely with with respect to the strip, for example, of deburring, while the strut support adopts a "U" configuration, since its consolidation of the wood core is mainly done to through its lateral branches, since its middle branch is located in Direct communication with the housing for perpendicular strapping to the previous cut, extending in any case the body ribbed said support strut on a flat upper flap, which it is the one that emerges from the wood core, and the one that rests on the strap  cutting, presenting the corrugated body of said wide strut bevels on the upper vertices and free of its branches lateral, to facilitate the recovery effect of the elements elastic, usually rubber, which tend to eject the plate cardboard after punching it.

Obviously both the support struts and affirmation pieces can be used not only in blades for deburring, but also in all those others blades that require a mutual union and that can be separated by effect of mechanical fatigue.

The possibility of providing support struts on the sides of any blade, regardless of whether or not it comes together with another, conveniently immobilizing it transversely, which allows the use of shorter blades, resulting more Quick manufacturing and handling.

Description of the drawings

To complement the description that is being performing and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical realization of it, is accompanied as part member of that description, a set of drawings where with illustrative and non-limiting nature, what has been represented next:

Figure 1.- Shows, according to a representation schematic plan and by way of example, the development of a rotary die for obtaining, from a plate of cardboard, of two successive boxes, in which they are especially observed perimeter cutting strips and deburring strips marginal.

Figure 2.- Shows a partial detail in perspective of the same rotary die, with a detail extended to affirmation piece level.

Figure 3.- Shows a side elevation view of the set represented in the previous figure.

Figure 4.- Shows an enlarged detail and in Support strut perspective.

Figure 5.- Shows another enlarged detail and in perspective, now of the affirmation piece.

Figures 6 and 7.- Show, finally, similar representations to those of figures 2 and 3 but corresponding to a flat die also made according with the invention

Preferred Embodiment of the Invention

Figure 1 shows two cardboard boxes adjacent, in development, of the type of self-assembling, based on a central sector (1), constituting the fund of the box, surrounded by sectors (2) constituting the gates and sectors (3) constituent of the testeros, the latter with extensions sides (4) to assemble the box by fixing the gualderas (2), and with a superior extension (5) that constitutes a  upper bridge over the mouth of the box, this being purely exemplary realization, to allow understanding with more clearly the object of the invention, which is applicable to any other type of cardboard box obtained from die cut

As also seen in Figure 1 and especially in figure 2, to obtain these boxes of cardboard the die has a wooden core (6) in which establish cutting strips (7) that correspond to the perimeter of each box and that are substantially embedded in the core of wood (6) specifically in grooves (8) thereof, converging laterally on the marginal cutting strips (7), strips of deburring (9), very close to each other, whose purpose is to fragment the marginal strips or cardboard scraps that are produced in the die cut, corresponding to the material established between external cuts (7) and the edge of the cardboard plate from which part, so that said deburring strips (9) allow a very sharp fragmentation of such disposable strips, facilitating the fall of the same and avoiding problems in the rotary die by hitching such strips.

Well, according to the invention, the cutting strips (7) are assisted in correspondence with each of the deburring strips (9), by a support strut (11) that adopts a U-shaped corrugated configuration, whose lateral branches have wide bevels (12) in correspondence with its upper and free vertices, and whose middle branch is prolonged superiorly in a fin (13) that is mostly the one emerges from the wood core (6), as shown in the figure 2, specifically of the "U" grooves (14) in which interlocks the corrugated body of the strut (11), which nonetheless emerges slightly from said grooves (14), so that its edges inclined or beveled (12) facilitate the recovery effect of elastic elements, not represented in the figures, that drive the cardboard plate after die cutting, for its independence of the die

This support strut (11) immobilizes laterally the cutting strip (7) against the deburring strip (9), as observe especially in figure 3, preventing them from occurring slots between these elements that may harm the correct die operation.

However, and to ensure even more this relative immobilization between cutting strip (7) and strapping of deburring (9), in correspondence with the outer limb of each Deburring strap (9) is a piece of affirmation (15), the represented in detail in figure 5, consisting of a plate rectangular that is inserted transversely in the wood core (6), butting on the corresponding edge of the strapping of deburring (9) and immobilizing it as also seen in the figure 3.

As indicated above, it has been also provided for the possibility of providing support struts (11) on the sides of any blade, regardless of is converging or not with another, immobilizing it conveniently in transverse direction, which allows the use of blades more short, resulting in faster manufacturing and handling.

Finally and as seen in figures 6 and 7, the essential elements of the invention, that is the strut of support (11) and the affirmation piece (15), are equally applicable to a flat die (6 '), in which the cutting strip has been referenced with (7 ') and the deburring strip with (9').

Claims (4)

1. Die for the cutting of cardboard boxes, of the type of those constituted by a cylindrical or semi-cylindrical wooden core, in the case of a rotary die, or by means of a flat plywood board in the event that it is a flat die, with grooves in which cut strips and deburring strips are inserted, the latter for fragmentation of the marginal and residual strip produced in each plate after die cutting of the boxes, characterized in that it incorporates, in correspondence with any of the cutting strips established in the core, in correspondence with the internal face of the cutting strips, and more specifically in correspondence with each point of each cutting strap on which a perpendicular strap, an insert support strut comes together. in a groove of the wooden core, so that said support strut laterally immobilizes the cutting strip, preventing it from separating from the inner end of the corresponding perpendicular strap. 2. Die for the cutting of cardboard boxes, according to claim 1, characterized in that said support strut adopts a corrugated configuration of "U" section, with wide bevels at its upper and free vertices, and from whose lateral branch emerges superiorly a flat fin that, together with the proximal section of the corrugated body, constitutes the emerging part of the support strut with respect to the wood core. 3. Die for the punching of cardboard boxes, according to previous claims, characterized in that at the opposite end of each perpendicular strap, that is to say at the outer end thereof, it incorporates an affirmation piece, consisting of a rectangular plate that interlocks transversely in a groove of the wooden core, and which, supported on the edge of the deburring strip, constitutes a stop for the latter, complementary to the inner support strut. 4. Die for carton die cutting, according to previous claims, characterized in that the support struts are also capable of being placed on the lateral faces of any cutting strip, at any point thereof, regardless of whether it is the point of confluence with another cutting strip.