WO1996026049A1

WO1996026049A1 - System for fixing rotary dies in laminar material stamping machines

Info

Publication number: WO1996026049A1
Application number: PCT/ES1996/000037
Authority: WO
Inventors: Ramón SERRA OBIOL
Original assignee: Comercial Industrial Maquinaria Carton Ondulado, S.A. - Cimcosa
Priority date: 1995-02-22
Filing date: 1996-02-21
Publication date: 1996-08-29
Also published as: ES2120320B1; ES2130912A1; ES2120320A1

Abstract

The system comprises a plurality of bolts (3), each of them being couplable to an actuator device (5), as well as means for the rapid coupling between each bolt (3) and each actuator device (5). The rapid coupling means to couple each bolt (3) with each actuator device (5) comprise a plate (4) provided with an elongate orifice (9), the extremity of the bolt (3) having a substantially rectangular cross section so that, in a first position, it penetrates in said orifice (9) and, in a second position, it cannot go through said orifice, the extremity of the bolt (3) being thus fixed to said plate (4). Each of the actuator devices (5) is housed inside a hollow body (16) which is fixed to the die-holder cylinder (2). It provides for a rapid fixing of the rotary die to the die-holder cylinder.

Description

SYSTEM FOR THE HOLDING OF ROTATING TROQUELS IN LAMINARY MATERIAL TROQUELING MACHINES

The present invention relates to a system for fastening rotary dies to die-holder cylinders in die-cutting machines of sheet material.

BACKGROUND OF THE INVENTION

In rotary die cutting machines, the sheet material to be cut, for example cardboard for the manufacture of boxes, moves between a rotating die cylinder, on which the die is mounted, and a counter-die or anvil cylinder, also rotating, so that at each turn of the cylinders the die hits the counter-die and makes a cut or deformation in the cardboard. To prevent the die from being damaged by the blow, the surface of the counter-die is provided with a polyurethane coating. Currently, the rotary dies are held on the die-holder cylinder by means of screws that are attached to the corresponding threaded holes made in the surface of the die-holder cylinder.

This fastening system has the main drawback that it is excessively slow, since the number of screws to be placed is considerable. This means that the downtime of the machine every time a new die must be mounted is excessive, which has an impact on the productivity of the rotary die cutting machine.

DESCRIPTION OF THE INVENTION

With the system of the invention, the aforementioned problem is resolved, presenting other advantages that will be described. The system for securing rotary dies in die-cutting machines of the invention comprises clamping means between the die and a die-holder cylinder around which the die is arranged, and is characterized by the fact that the fastening means they comprise a plurality of bolts, each of which is attachable to an actuator device.

This feature allows a quick fastening of the rotary die to the die-holder cylinder, which means that the machine downtime to change the die is shorter than the current one, improving the productivity of the die cutting machine.

Advantageously, the system of the invention comprises means for quick coupling between each bolt and each actuator.

Also advantageously, the quick coupling means between each bolt and each actuator device comprise a plate provided with an elongated hole and by the fact that the end of the bolt is of substantially rectangular section, so that in a first position it penetrates said hole and in a second position it cannot pass through it, thus fixing the end of the bolt to said plate. In this way, the fastening will be done by simply placing the bolts in their respective holes and turning them with a suitable wrench.

Preferably, the bolts comprise in the vicinity of one of its ends a part of smaller diameter and, from the part of smaller diameter to said end, two opposite flat recesses, and by the fact that at the other end they comprise an area of greater diameter that holds the die to the die-holder cylinder, so that it allows the introduction of the end of the bolt that has the area of smaller diameter, and when turning the bolt, said end is attached to the end of the actuator device.

Also preferably, the actuator devices are fluid dynamic cylinders, which act independently in the four quadrants of the die cylinder.

According to one embodiment, the fluid dynamic cylinders are pneumatic or hydraulic cylinders.

Also preferably, the bolts are placed on the three-pin rotary die, whereby the bolts occupy the entire surface of the die evenly.

According to one embodiment, the system of the invention also comprises screws for attaching the rotary die to the die-holder cylinder, these screws are placed to ensure the fixation of the rotary die to the die-holder cylinder.

Preferably, the screws are also placed on the three-sided rotary die, occupying the places not occupied by the bolts.

Advantageously, each of the actuator devices is housed inside a hollow body that is attached to the die-holder cylinder. This allows the manufacturing costs of the die cutting machine to be significantly cheaper. It also allows maintenance and machining of it easier.

Also advantageously, each fluid dynamic cylinder comprises means for preventing the rotation of its piston relative to the hollow body. Preferably, the means for preventing the rotation of the piston of the fluid dynamic cylinder with respect to the hollow body are a pin integral with the piston that travels inside a groove made in a second body that is fixed to said hollow body. BRIEF DESCRIPTION OF THE DRAWINGS

To better understand how much has been exposed, some drawings are attached in which, schematically and only by way of non-limiting example, a practical case of realization is represented.

Figure 1 is a sectional elevational view of the die-holder cylinder with the rotary die; Figure 2 is a perspective view of the die-holder cylinder with the rotary die; Figure 3 is a perspective view of a bolt and the end of a pneumatic cylinder; Figure 4 is a sectional view in side elevation of two pneumatic cylinders, showing a first embodiment of the tire clamping system; and Figure 5 is a sectional view in side elevation of two pneumatic cylinders, showing a second embodiment of the pneumatic cylinder clamping system.

DESCRIPTION OF A PREFERRED EMBODIMENT

As can be seen in the drawings, the system for attaching rotary dies 1 to die-holder cylinders 2 comprises a plurality of bolts 3, each of which is attachable to a pneumatic cylinder 5.

The bolts 3 comprise in the vicinity of one of its ends a part of smaller diameter 6 and, from the part of smaller diameter to said end, two opposite flat recesses 7.

The bolts 3 also comprise at one of their ends an area of greater diameter 8 that holds the die 1 to the die-holder cylinder 2. The end of the rod of the pneumatic cylinder 5 it comprises a plate 4 provided with an elongated hole 9, so that it allows the introduction of the end of the bolt 3 that has the area of smaller diameter 6. By turning the bolt 3, said end is attached to the end 4 of the pneumatic cylinder 5.

As can be seen in Figure 2, the bolts 3 are placed on the rotary die 1, so that they occupy the entire surface of the die 1 evenly. The rotary die holder 2 comprises a centering regatta 16 of the die 1.

The fastening system can also comprise screws 10 for attaching the rotary die 1 to the die-holder cylinder 2. In this case, the screws 10 are also placed on the three-wheeled rotary die 1, occupying the places not occupied by the bolts 3.

The air injection to the pneumatic cylinders 5 is carried out by means of four air inlets 11 located at one end of the die-holder cylinder 2. Each of these inlets 11 feeds the fourth part of the pneumatic cylinders 5, acting on each of the four 90 ° quadrants of the die holder cylinder 2.

Figure 4 shows the placement of a rod 13 between the pneumatic cylinders 5, threaded on the central support shaft 14 to stiffen and avoid bending due to the tension of the bolts 3. The pneumatic cylinder 5 comprises a strap 15, which It serves to keep bolt 3 in position after turning it 90 °. As can be seen in Figure 5, the pneumatic cylinders 5 are housed inside two hollow bodies 16. Each of these bodies 16 is fixed to the die-holder cylinder 2 by a pair of fastening screws 21. Each cylinder dynamic fluid 5 comprises means to prevent the rotation of its piston 17 with respect to the hollow body 16. These means are a pin 18 integral with the piston 17 of the cylinder 5, which travels inside a groove 19 made in a second body 20, which at its Once it is fixed to said body 16 by the same fastening screws 21.

At the bottom of each pneumatic cylinder 5 there is a hole 22 connected to a duct (not shown) for the injection of pressurized air. The bolt 3 corresponding to the cylinder 5 on the left of the figure is in a position in which it does not hold the die 1. To keep the cylinder in this position, the pressurized air introduced through the hole 22 pushes the piston 17 which makes compress the spring 23, which is housed between the piston 17 and said second body 20.

When the bolt 3 has been turned 90 ° with respect to the position in which it is introduced (corresponding to the cylinder on the right of the figure), the pressurized air exits the cylinder 5 through the hole 22 and the spring 23 recovers its original position, keeping the die 1 attached to the die holder cylinder 2.

In the case of the present invention, this fastening system is intended to hold a die in a die cutting machine, but it is obvious to any person skilled in the art to use this same system for other similar type of machines.

It is noteworthy that, in order to be sure that the bolt 3 has been correctly inserted in the groove 27 and turned 90 ° necessary for its perfect fastening, two planes 24, 25 have been made that fit in the groove 26. Only in the case considered works, since otherwise, when the air exits through the hole 22 and the piece 17 descends, the bolt 3 does not descend, being evident to the naked eye that it does not hold the die 1. In figure 1 you can see the different phases of work in four of the means of collection represented. - First phase: The pneumatic cylinder 5a has air pressure and brings the end thereof closer to the size 12 of the die-holder cylinder 2. The bolt 3a is in the proper position to penetrate the die.

- Second phase: The pneumatic cylinder 5b also has air pressure, which allows the insertion of: ' ¹ of the bolt 3b into the bore 12 of the die-holder cylinder 2. When the bolt 3b is introduced into the bore 12, it is turned 90 °, holding the end that has the two recesses "the bolt 3b to the pneumatic cylinder 5b. - Third phase: The cylinder 5c has no air pressure, so that the spring pushes the bolt 3c to the inside of the carrier cylinder die 2, holding the zone 8 of greater diameter of the bolt 3 the die 1 ai c__ ndro porta-punquel 2. - Fourth phase: The cylinder 5ct has air pressure, being arranged for the introduction of the per ": 3. As that the bolts 3 are being placed, the air from the pneumatic cylinders 5 is carried out by α-quadrants, with the die 1 attached to the die-holder cylinder 2.

Claims

1. System for fastening rotary dies (1) in die-cutting machines of sheet material, which comprises means for holding between the die (1) and a die-holder cylinder (2) around which the die is arranged, characterized by the fact that the fastening means comprise a plurality of bolts (3), each of which is attachable to an actuator device (5).

2. System according to claim 1, characterized in that it comprises means for quick coupling between each bolt (3) and each actuator device (5).

System according to claim 2, characterized in that the quick coupling means between each bolt (3) and each actuator device (5) comprise a plate (4) provided with an elongated hole (9) and by the the fact that the end of the bolt (3) is of substantially rectangular section, so that in a first position said hole (9) penetrates in a second position cannot pass through it, thus fixing the end of the bolt (3 ) to said plate (4).

System according to claim 2 or 3, characterized in that the bolts (3 comprise in the vicinity of one of its ends a part (6ι of smaller diameter and, from the part (6) of smaller diameter to said end, two recesses (7) opposite planes, and by the fact that at the other end they comprise an area (8) of greater diameter that holds the die (1) to the die-holder cylinder (2), so that it allows insertion of the end of the bolt (3) having the area (6) or smaller diameter, and when turning the bolt (3), said end is attached to the end (4) of the actuator device (5).

5. System according to claim 1, characterized in that the actuator devices are fluid dynamic cylinders (5), which act. independent in the four quadrants of the die-holder cylinder (2).

6. System according to claim 5, characterized in that the dynamic fluid cylinders are pneumatic (5) or hydraulic cylinders.

7. System, according to claim 1, characterized in that the bolts (3) are placed on the die-cutting die (1).

System according to claim 1, characterized in that it also comprises screws (10) for attaching the rotary die (1) to the die-holder cylinder (2).

9. System, according to claims 7 and 8, characterized in that the screws (10) are also placed on the rotary die (1), occupying the places not occupied by the bolts * 3).

10. System according to any of the preceding claims, characterized in that each of the actuator devices (5) is housed inside a hollow body (16) that is attached to the die-holder cylinder (2).

System according to claim 5, characterized in that each dynamic fluid cylinder (5) comprises means (18, 19) for preventing the rotation of its piston (17) with respect to the hollow body (16).

System according to claim 11, characterized in that the means for preventing the rotation of the piston (17) of the dynamic fluid cylinder (5) with respect to the hollow body (16) are a pin (18) integral with the piston (17 ) that travels inside a groove (19) made in a second body (20) that is fixed to said hollow body (16).