ES1289947U - Troqueles clamping device on die -machine machines (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Troqueles clamping device in raincoats of laminar material, which includes a movable bolt with respect to an internally hollow piston that is axially movable with respect to an outer cylinder due to the introduction of a fluid under pressure, being the closed exterior cylinder For a lid provided with a passing hole through which the bolt is sliding, first elastic media linked to a relative movement of the bolt with the plunger and a few seconds elastic media linked to a relative movement of the plunger with respect to the outer cylinder, having The first elastic a helical spring located inside the plunger, characterized by the fact that the second elastic mediums include a plurality of distributable helical docks radially in holes practiced in the peripheral area around the bolt and that are in contact with the lid. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

Die clamping device in die cutting machines

OBJECT OF THE INVENTION

The purpose of this application is to register a die clamping device for a cardboard sheet die-cutting machine.

More specifically, the invention proposes the development of a die clamping device for sheet material die-cutting machines, being suitable for devices that are provided with a retractable bolt that acts with various elastic means.

BACKGROUND OF THE INVENTION

In rotary die-cutting machines, the material to be cut, for example, cardboard for the manufacture of boxes, moves between a die-holding cylinder and a counter-die cylinder or rotating anvil, so that for each revolution of the cylinders the The die hits the counter-die and makes a cut or deformation on the cardboard sheet. To prevent the die from being damaged by impact, the surface of the counter-die is provided with a polyurethane coating.

Different systems are known to carry out the fastening of the rotary dies on the die-holding cylinder. A known fastening system is disclosed in document ES 2 155334, which describes a plurality of retractable bolts (inserts) actuated by an actuator device, housed inside a hollow body attached to the die-holding cylinder. This system, which has proven to be effective for many years, also requires having the maximum number of inserts to guarantee maximum firmness in the clamping of the die on the die-holding cylinder.

In the case of die-holding cylinders with a relatively small diameter, the number of inserts is limited by the size of the cylinder where the retractable pin is housed, which does not allow the provision of two capiculate inserts, the dimensional limitation being due to the length of the pin and of the internal elastic means provided for the extension and retraction of the retractable pin.

In addition, the applicant is not currently aware of an invention that has all the features described in this specification.

DESCRIPTION OF THE INVENTION

The present invention has been developed in order to provide a clamping device for dies 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. which is attached below.

It is therefore an object of the present invention to provide a device for holding dies in die-cutting machines for sheet material, being of the type that comprises a movable pin with respect to an internally hollow piston that is axially movable with respect to an external cylinder by the introduction of a fluid under pressure, the outer cylinder being closed by a cover provided with a through hole through which the pin slides, first elastic means linked to a relative movement of the pin with the piston and second elastic means linked with a relative movement of the piston with respect to the outer cylinder, the first elastic having a helical spring located inside the piston. In particular, the invention is characterized by the fact that the second elastic means comprise a plurality of helical springs that can be distributed radially in holes made in the peripheral area around the bolt and that are in contact with the cover.

Thanks to these characteristics, it is possible to reduce the length of the bolt without reducing the force it exerts on the die, thus being suitable for cylinders with a small diameter. The fact of having a plurality of springs allows the sum of forces to be equal to that which would be exerted by a single spring such as the system shown in figure 2, while allowing greater relative deformation. On the other hand, figure 3 shows the arrangement of two devices diametrically opposed to each other, thanks to the smaller dimensions that the device can adopt due to the arrangement of multiple helical springs.

Another no less important advantageous aspect is the fact that the force exerted by the bolt against the die that is mounted on the die-holding cylinder can be easily varied, simply by replacing the stiffness of the helical springs or by varying their number inside. of the plunger, that is, fewer springs can be used compared to the number of holes provided for their accommodation.

According to another constructive aspect of the invention, the lower face of the cover has a plurality of radially distributed cavities that are designed to partially house the helical springs.

Preferably, the retractable bolt comprises, on its head, an area with a larger diameter configured to hold a die to a die-holding cylinder.

In a preferred embodiment, the lid and the outer cylinder may be fixed by means of a plurality of radially distributed holes and pins.

Additionally, there are sealing means present between the outer cylinder that are in contact with the outer face of the cylinder that forms the piston.

The clamping device described represents, therefore, an innovative structure with structural and constitutive characteristics hitherto unknown for the purpose for which it is intended, reasons that, together with its practical utility, provide it with sufficient grounds to obtain the privilege of exclusivity that is requested. .

Other characteristics and advantages of the fastening device 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:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1.- Is an exploded perspective view of an embodiment of the die clamping device according to the present invention;

Figure 2.- Is a sectional elevation view of a prior art clamping device installed in a die-holding cylinder;

Figure 3.- Is a sectional elevation view of a pair of clamping devices according to the invention installed in a die-holding cylinder; Y

Figures 4a-d.- Are elevation views showing the different functional positions adopted by the fastening device of the invention.

DESCRIPTION OF A PREFERRED EMBODIMENT

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, top, bottom, and the like in the description and claims are used for purposes of description and not necessarily to describe relative positions.

The die clamping device is intended to be used in clamping systems for cylinders that are part of stamping machines for sheet material, comprising a movable pin (1) with respect to an internally hollow piston (2) that is movable axially with respect to to an internally hollow outer cylinder (3) by introducing pressurized air through an inlet port (10) located at the bottom of the outer cylinder (3) which is connected to a conventional external pressurized air supply source ( not represented).

The bolt (1) comprises in its head (101), an area of larger diameter configured to fasten a die to a die-holding cylinder.

The outer cylinder (3) is closed at the top by a cover (4) that has an outer contour adapted to the radius of curvature of the die-holding cylinder (14), which is provided with a central through hole (40) through which it can extend. and retract the pin (1).

In addition, the cover (4) has a seat (41) at one end of the central through hole (40) intended to position the area with the largest diameter of the bolt.

To execute the different relative movements of the bolt (1) and the piston (2), the clamping device comprises first elastic means linked to a relative movement of the bolt (1) with the piston (2) and second elastic means (described in greater detail later) linked to a relative movement of the piston (2) with respect to the outer cylinder (3). The first elastic means consist of a helical spring (5) located inside the piston (2). The fixing and guiding of the helical spring (5) is carried out through the provision of an intermediate element (6) with a general cup shape in which one end of the bolt (1) is threaded. Said intermediate element (6) has a projecting rim (60) that acts as a stop for one end of the helical spring (5).

With particular reference to the second elastic means, they comprise a plurality of helical springs (7) that are radially distributed in holes (20) made in the peripheral zone around the bolt and that are in contact with the cover.

Returning again to the cover (4), its lower face has a plurality of radially distributed cavities that are intended to partially house the helical springs (7).

As can be seen in figure 1, the cover (4) and the outer cylinder (3) are fixed by means of a plurality of holes (31) made and distributed radially in a protruding rim (30) of the outer cylinder (3) to allow the coupling of corresponding pins (8).

To prevent leaks of pressurized air inside the outer cylinder (3), there are sealing means present between the outer cylinder that are in contact with the outer face of the cylinder that forms the piston (2). More specifically, such sealing means consist of an O-ring (9) housed in a diametrical groove present on the inner face of the outer cylinder (3).

To prevent the rotary movement of the piston (2) with respect to the external cylinder (3), means are provided that essentially consist of an elongated pin (11) that it has a smaller diameter than the helical springs (7) so that it is housed inside one of the helical springs (7), and a blocking element (12) can be coupled to the pin through a hole (42) made in the cover (4) (see figure 1).

Figure 4a shows the device in a first position in which the bolt (1) is in a rest position, that is, the area with the largest diameter of the bolt (1) is located in the seat (41). of the lid (4), and the second elastic means being in a fully extended condition. In figure 4b the plunger (2) is displaced superiorly by the introduction of compressed air in the chamber (32) through the inlet (10), where the pin (1) is in its extended position in such a way which is beyond the die (13) without being in contact with it and the second elastic means are partially compressed. On the other hand, in figure 4c the inside of the outer cylinder (3) is again devoid of pressurized air, where the piston (2) is slightly displaced downwards and the pin (1) is in a position such that holds the die (13) against the die-holding cylinder (5). Finally, in figure 4d the inside of the outer cylinder (3) is supplied with compressed air and the bolt (1) is in a retracted position with respect to the piston (2) as the die (13) is devoid of a hole at that point. through, the first elastic means being in a fully compressed condition.

The details, shapes, dimensions and other accessory elements used in the manufacture of the holding device of the invention may be conveniently replaced by others that do not deviate from the scope defined by the claims included below.

Claims (7)

1. Device for clamping dies in die-cutting machines for sheet material, comprising a movable bolt with respect to an internally hollow piston that is movable axially with respect to an external cylinder by the introduction of a fluid under pressure, the external cylinder being closed by a cover provided with a through hole through which the pin slides, first elastic means linked to a relative movement of the pin with the piston and second elastic means linked to a relative movement of the piston with respect to the outer cylinder, having the first springs have a helical spring located inside the plunger, characterized in that the second elastic means comprise a plurality of helical springs that can be distributed radially in holes made in the peripheral area around the bolt and that are in contact with the cover. 2. Device for clamping dies according to claim 1, characterized in that the lower face of the cover has a plurality of radially distributed cavities that are designed to partially house the helical springs. 3. Device for clamping dies according to claim 1, characterized in that the bolt comprises, in its head, an area with a larger diameter configured to hold a die to a die-holding cylinder. 4. Die clamping device according to any of the preceding claims, characterized in that the cover and the outer cylinder are fixed by means of a plurality of radially distributed holes and pins. 5. Die clamping device according to any of the preceding claims, characterized in that it includes sealing means present between the outer cylinder that are in contact with the outer face of the cylinder that forms the plunger. 6. Die clamping device according to any of the preceding claims, characterized in that it includes anti-rotation means configured to prevent the rotary movement of the piston with respect to the cylinder. 7. Die clamping device according to claim 6, characterized in that the anti-rotation means consist of an elongated pin that is housed inside one of the helical springs, and a locking element that can be coupled to the pin through a hole drilled in the lid.