Patent Application
20250001639
The object of this application is the registration of a die-holding cylinder for a sheet material die-cutting machine.
More specifically, the invention proposes the development of a die-holding cylinder that allows an optimization in the arrangement of holes provided for engaging dies.
Within the sector of rotary die-cutters for handling cardboard sheets, the use of a die-holding cylinder is known that has an engagement system for the dies that allows quick mounting and dismounting of the die on the die-holding cylinder. An example of this type of engagement system is disclosed in document ES 2155334.
Usually, die-holding cylinders have a grid of threaded holes so that the die can be fixed to the cylinder by means of screws through holes made on the die with the same distribution of threaded holes present on the die-holding cylinder. Although the arrangement of the above engagement system has a number of advantages, it should be noted that the implantation of said system in the die-holding cylinder inevitably reduces the number of threaded holes. This would not be a problem if all the dies allowed for fixing holes to be made for said system at any point on the surface of the die. On the contrary, if there is a high density of blades or other elements on the die, it is possible that not enough holes can be made for the engagement system to guarantee a good fixation of the die on the die-holding cylinder because the position of the them match with blades, splitters, extractors, etc. That is why, sometimes, it is necessary to ensure the fixing of the die on the die-holding cylinder with the use of fixing screws apart from the engagement system. A possible solution to this is to increase the number of fastening elements of the engagement system, however, it implies a weakening in terms of the mechanical resistance of the cylinder that can negatively affect the shocks that the cylinder receives during its operation, that is, during punching operations.
The present invention has been developed in order to provide a die-holding cylinder that is configured as a novelty within the field of application and solves the aforementioned drawbacks, also providing other additional advantages that will be evident from the description that follows.
The die-holding cylinder according to the present invention is defined in claim 1, and additional optional features are included in the dependent claims.
It is, therefore, an object of the present invention to provide a die-holding cylinder for a die-cutting machine for laminar material, intended to be incorporated into die-cutting machines, especially designed for die-cutting cardboard sheets with subsequent use in the industry of manufacturing packages comprising a surface provided with a plurality of internally threaded holes, such holes presenting a grid arrangement formed by a plurality of rows and lines in the “X” and “Y” coordinate axes, and engagement means consisting of a plurality of fastening assemblies each having a retractable bolt protruding from the surface of the cylinder defining a geometric center, the bolts being intended to engage dies.
In addition, geometric axes of the bolt of the fastening assemblies are positioned in such a way that they are individually distributed between two internally threaded holes and axially aligned on a coordinate axis “X” that passes through the two holes and at an equidistant distance between said two holes.
It should be mentioned that these threaded holes are provided to ensure the fixing of the rotary die to the die-holding cylinder by means of screw elements in the event that the engagement system described below, which is based on the use of retractable bolts, is not used.
Thanks to these characteristics, the incorporation of the engagement system eliminates the minimum number of threaded holes for fixing the die with screws.
Preferably, the central circumferential line of the die-holding cylinder body surface, corresponding to the coordinate axis “Y” in a centered position in an unfolded surface condition, provided with internally threaded holes located extending circumferentially around from the surface, it is devoid of fastening assemblies. This is due to the possibility that the center of the die has cutting means, such as blades or cleavers. For this reason, it makes it impossible to make holes in the fixing elements, so that said elements would often be rendered useless.
Preferably, the coordinate axis “X” is a longitudinal axis of the die-holding cylinder and the coordinate axis “Y” is a transverse axis of the die-holding cylinder.
Preferably, the fastening assemblies are arranged on the surface of the die-holding cylinder in a staggered pattern.
According to the invention, the fastening assembly comprises a movable bolt actuated by an actuator device, being housed inside a hollow body that is attached to the body of the die-holding cylinder.
Advantageously, each fastening assembly occupies only two threaded holes.
In addition, a central transverse plane divides the die-holding cylinder into a first half and a second half, the arrangement of the threaded holes and the fastening assemblies in the second half being rotated 180° or being symmetrical with respect to the arrangement of the threaded holes and the fastening assemblies of the first half. This feature allows the die to be placed in two different positions, thus facilitating its positioning for operators.
The described die-holding cylinder represents, therefore, an innovative structure with structural and constitutive characteristics hitherto unknown for its intended purpose, reasons that, together with its practical utility, provide it with sufficient foundation to obtain the privilege of exclusivity that is requested.
Other characteristics and advantages of the die-holding cylinder object of the present invention will be evident from the description of a preferred, but not exclusive, embodiment, which is illustrated by way of non-limiting example in the accompanying drawings, in which:
In view of the aforementioned figures and, in accordance with the adopted numbering, an example of a preferred embodiment of the invention can be seen in them, which comprises the parts and elements that are indicated and described in detail below.
Furthermore, the terms first, second, third, and the like in the description and claims are used to distinguish between like items and not necessarily to describe a sequential or chronological order. The terms may be interchanged in appropriate circumstances and embodiments of the invention may operate in other sequences than those described or illustrated herein.
Furthermore, the terms top, bottom, upper, lower, and the like in the description and claims are used for purposes of description and not necessarily to describe relative positions.
As shown, the die-holding cylinder, generally indicated with the reference (1), is intended to be incorporated into die-cutting machines, especially designed for die-cutting cardboard sheets with subsequent use in the industry for manufacturing packages, such as, for example, for the manufacture of cardboard boxes.
This die-holding cylinder (1) comprises a cylindrical-shaped body that has a shaft (2) at each end to be engaged to the die-cutting machine (not shown), and a surface (3) provided with a plurality of holes (4) internally threaded. As can be seen more clearly in
According to the embodiment shown in the figures, the coordinate axis “X” is a longitudinal axis of the die-holding cylinder and the coordinate axis “Y” is a transverse axis of the die-holding cylinder.
In addition, a central transverse plane divides the die-holding cylinder into a first half (A) and a second half (B), with the arrangement of the threaded holes (4) and the fastening assemblies (5) in the second half (B) rotated 180° with respect to the arrangement of the threaded holes (4) and the fastening assemblies (5) of the first half (A), as can be seen in the embodiment of
The fastening assemblies (5) are in a staggered distribution as can be seen more clearly in
The reference point (O) (central reference point) of the geometric axes of the bolt (7) of the fastening assemblies are positioned in such a way that they are individually distributed between two holes (4) internally threaded and axially aligned on one coordinate axis “X” that crosses the two holes (4) and at an equidistant distance between said two holes (4).
It should be mentioned that the coordinate axis “Y” that corresponds to the central line (8) (indicated in
Returning to the fastening assembly (5), it comprises a linearly movable mushroom-shaped bolt (7) that is actuated by means of an actuating device based on a pneumatic system (cylinder-piston), being housed inside a hollow body which is attached to the body of the die-holding cylinder (1). The operation of the fastening assembly will not go into greater detail since it is the same as that disclosed in document ES 2155334 of the same owner as the present application.
It can also be seen in
In
In this second embodiment, the only difference with respect to the previous embodiment is that the arrangement of the threaded holes (4) and the fastening assemblies (5) in the second half (B) is symmetrical with respect to the arrangement of the threaded holes (4) and the fastening assemblies (5) of the first half (A).
The details, shapes, dimensions and other accessory elements used in the manufacture of the die-holding cylinder of the invention may be conveniently replaced by others that do not deviate from the scope defined by the claims included below.
| Number | Date | Country | Kind |
|---|---|---|---|
| U202132071 | Oct 2021 | ES | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/ES2022/070662 | 10/19/2022 | WO |
