WO2006026874A1

WO2006026874A1 - Method and device for holding sheet metal strips, and angular scissors

Info

Publication number: WO2006026874A1
Application number: PCT/CH2005/000498
Authority: WO
Inventors: Mauro Spiga
Original assignee: Soudronic Ag
Priority date: 2004-09-06
Filing date: 2005-08-26
Publication date: 2006-03-16
Also published as: CH711472B1; EP1786712A1; EP1786712B1; BRPI0514942A; US20080022819A1; PT1786712E; ES2391898T3

Abstract

The aim of the invention is to temporarily retain sheet metal strips (21 to 24) which are cut from a metal plate by a cylindrical knife-type cutting device (2). Said aim is achieved by using a holding device that magnetically and/or pneumatically grips the top face of the sheet metal strips, preferably in angular scissors, resulting in a substantially reduced adjusting effort and mechanical effort than in previously used torsion bars.

Description

Method and device for holding metal strips and angle shears

Reference to related applications

This application claims the benefit of Swiss Patent Application No. 01476/04, filed Sep. 6, 2004, the entire disclosure of which is hereby incorporated by reference.

background

The invention relates to a method for Kal¬ th of metal strips, the same time delivered from a cutting device, held substantially in their dispensing position and passed by dropping to a Förderein¬ direction. Furthermore, the invention relates to a corresponding device and an angle shear, in which the method or the device is provided.

State of the art

When sheet metal plates are cut into sheet metal strips with rotating knives, the metal strips are dispensed practically contiguously and simultaneously from the cutting device. In order to achieve an orderly transfer to a conveyor, it is known according to IT-AI 053 021 to hold the metal strips by means of rotary rods on which the metal strips with their undersides edge and essentially their dispensing position from the roller blades accordingly if held slightly inclined. As a result of the rotation of the bars, the metal strips then fall onto the depositing plane of a conveyor, which runs obliquely upwards

Has chains with drivers, the piercing from below the Able level and the close to each other lying sheet metal strip spaced promote in the second Rollen¬ an angle scissors. The turnstiles must be aligned very exactly parallel to hold the Blechstrei¬ fen and release. Each time the strip width is adjusted, the rotating rods must also be adjusted, and their parallelism must be checked and adjusted, which is expensive.

Presentation of the invention

The invention has the object to avoid these disadvantages.

In the case of the method mentioned at the outset, this is achieved in that the sheet metal strips are held magnetically and / or by negative pressure on their upper side. In particular, the holding takes place exclusively at the top of the metal strips.

The fact that the strips are held magnetically and / or by negative pressure at its top, eliminating the need to align the bracket exactly parallel to the sheet metal strip edges; it is sufficient if the holder engages on the respective sheet metal surface so that the respective sheet metal can be held until it has dropped, essentially in its discharge position in which it has escaped from the cutting device. The dropping is then carried out in a simple manner by deactivating the electromagnetic Festhal¬ least and / or by mechanical action on the sheet to overcome a permanent magnetic holding force or by deactivating the negative pressure by which the sheet is held on a mating surface.

The holding preferably takes place electromagnetically and by means of rollers on which the respective metal sheet moves along with its upper side as it emerges from the cutting device. Magnetic slidings, in particular with a coating which reduces the sliding friction for the sheet, are also preferred. In the pneumatic support by means of negative pressure surfaces are preferred with suction and with the sliding friction herabsetz¬ the coating. Thus, a stationary holder (also the rollers are stationary, since their roller axes are stationary) is preferred, along which the respective metal strip moves. This results in a simple and robust mounting without a special movement drive.

The mentioned advantages are further achieved with the holding device for an angle shear according to claim 9 and with the angle shear according to claim 17.

BRIEF DESCRIPTION OF THE DRAWINGS Further embodiments, advantages and applications of the invention emerge from the dependent claims and from the description which follows, based on the figures. Showing:

Figure 1 schematically in front view of the first cutting device, a first embodiment of the invention;

Figure 2 shows the embodiment of Figure 1 in side view;

FIG. 3 shows a side view of a further embodiment; and

Figure 4 is a partially sectioned view of a representation of a third embodiment of the invention.

FIG. 1 and FIG. 2 show various views of an angle former 1 shown in a greatly simplified manner, by means of which metal sheets 20 in a first cutting device 2, which as a rule has a plurality of spaced rolling knife pairs, to sheet metal strips 21, 22 , 23 and 24 are cut. In FIG. can be easily seen how a metal sheet 20, which has been lifted from ei¬ nem sheet metal stack 4, passes through the rotary knife cutting device 2 and as sheet metal strip 21 is discharged through the delivery rollers 16 and 17 in the direction of arrow A. FIG. 1 shows a frontal view of the cutting device 2, wherein the dispensing direction according to arrow A runs perpendicular to the plane of the drawing and to the observer. Correspondingly, it can be seen in FIG. 1 that the four metal strips 21, 22, 23 and 24 have been cut out of the metal sheet. Of course, this number and the size of the sheet-metal strip is to be understood only as an example and depends on the number and the distance of the Rollmessex- couple of the cutting device 2 from. According to the preferred use of the holding device in the case of an angle shear 1, these sheet metal strips are then fed to a further cutting device 3, which is generally arranged at right angles to the cutting device 2, wherein the cutting edges 21-24 are successively cut into smaller sheet metal sections 40 are cut. A conveyor 14 thereby promotes the metal strips 21-24 of the tray 13 to the cutting device 3. Such angle shears and the corresponding conveyor is well known to those skilled and need not be further explained here. In particular, the Italian typeface IT-AI 053

021, wherein the person skilled in an angle of the previously explained type and a conveyor with obliquely upwardly extending conveyor chains and different high entrainment is shown, which preferably also in an angle shear with the still to be explained holding device according to the present Er ¬ finding is used.

The present invention now relates to the holding of the individual metal strips, or a Haltevor- direction 10 or 10 'or 10 ", which simultaneously leave the first cutter 2 and held above this before their delivery to the conveyor 14 be, so that an orderly delivery to the För¬ dereinrichtung results. The sheet-metal strips are held in the prior art, to which reference may again be made to the abovementioned Italian type, by specially shaped rotating rods on which the sheet-metal strips rest with the edge regions of their underside. As already explained in the introduction, these rotating rods are rotated in order to cause the sheet metal strips to fall on a delivery of the conveying means, from which deposit the sheet metal strips are gripped by the conveying means and conveyed to the cutting device 3. The present invention relates to receiving and holding the metal strips 21-24 during and after the delivery of the metal strips by the cutting device. For this purpose, according to the invention, the sheet metal strips are held on their upper side and preferably only on their upper side, so that no holding elements act on the sheet metal strips on the underside. However, it could also be the case that, in addition to the holding from above, auxiliary elements are also provided which additionally support the metal strips, for example on the front side, on their underside and are each pulled away for dropping the metal strips. The Hal¬ th at the top of the sheets is carried out magnetically and / or pneumatically by negative pressure. Preference is given to a first embodiment of the holding device 10, in which holding is effected by means of magnetic rollers, along which the respective metal sheet moves along when it leaves the cutting device 2. FIG. 2 shows how the sheet 21 leaves the cutting device in the direction of the arrow A and travels along the rollers 6a-6e, wherein the sheet has already reached the rollers 6a, 6b and 6c in the position of FIG. Due to the magnetic action of the magnetic rollers, the sheet is held by the rollers in its dispensing position above the tray 13 of the conveyor. Become. Permanent magnetic rollers used, so must the dropping of the respective sheet 21-24 in the direction of arrow B by the jewei- 1, are caused by a mechanical Überwin¬ the holding force of the rollers. Thus, for example, the rollers could be moved upwards into the only indicated roller carrier 5, so that the rollers are lifted off the respective sheet, which is held back by the roller carrier 5 or non-magnetic projections arranged thereon, so that it prevents the movement of the roller carriers Rolls 5 can not join up. There may also be an outgoing element which pushes the respective sheet down from the rollers. Preferably, however, the rollers are electromagnetically activatable, so that magnetically holding the metal strips on the rollers can be brought about by switching on the current generating the magnetic field, and by dropping off the current, the metal sheet falls down Aufla¬ ge 13 is effected. In FIGS. 1 and 2, this is represented by a corresponding electromagnetic arrangement 11, which is controlled by the controller 27 of the angle shears 1. The corresponding embodiment of such an electromagnetic roller arrangement will be readily apparent to those skilled in the art and need not be explained in detail here. As already mentioned, the other metal sheets 22-24 are also held by corresponding core sets 7, 8 and 9, so that all metal sheets leaving the cutting device 2 are held in the corresponding manner above the tray 13 and, if required, the metal sheet Further promotion will be dropped. As a rule, the rollers are driven only by the sheet metal moving along them, which is conveyed by the cutting device or, at the least, driven output rollers 16, 17. The rollers can also be driven by a motor, which may apply to all or only individual roles. FIG. 3 shows a further embodiment as a holding device 10 ', in which only a side view of the angle shear similar to that of FIG 2, and wherein like reference numerals designate like elements. Instead of each roller set, a magnetizable rail 30 is provided here, over which the respective metal sheet slides when it is delivered by the cutting device 2 and which rail holds the metal sheet, as long as it is magnetized accordingly by the electromagnet arrangement. So that the sheet 21 can be pushed with its upper side over the rail 30 without great frictional resistance, which is arranged, for example, in a rail holder 35, the rail 30 is provided with a friction-reducing coating at its contact surface for the sheet, for example with a plastic coating. A combination of the embodiments of FIGS. 1 and 2 as well as 3 is possible, so that some of the sheets of sets of rolls and others of the

Sheets are held by rails. With the roller sets, it is not necessary for all the rollers to be magnetic, some of the rollers may also be e.g. be formed by plastic rollers, and the same way, the rail sections of plastic and ab¬ cut way made of metal.

4 shows a further embodiment as a holding device 10 ", in which the holding of the sheet metal from above is effected by negative pressure, so that the respective sheet is sucked onto the carrier 36. For this purpose, the carrier 36, which is intended for Each plate may be individually or for all together, which also applies to the roller or rail carrier, be provided on its surface 38 with a plurality of openings 37 through which air is sucked by means of a suction pump 31. In the carrier 36 creates a negative pressure which advances the respective metal sheet 21 on the carrier 11. The advancement of the metal sheet can in turn be facilitated by a sliding coating on the surface of the carrier 36, which lies opposite the upper side of the metal sheet 21. By switching off the suction pump 31, which in turn is not shown control, a drop of the sheet 21 is effected on the tray 13.

The preferred embodiment of the conveying means 14 is that which is shown in the said Italian document and causes a separation of the sheets 13 which are located close to one another on the depositing layer 13 by means of an oblique chain displacement and different drivers which are pushed through the depositing plane 13. However, it can be used instead of this conveyor any other known in the art conveyor. ^'

While preferred embodiments of the invention are described in the present application, it should be clearly understood that the invention is not limited thereto and may be embodied otherwise within the scope of the following claims.

Claims

claims

1. Method for holding metal strips

(21-24), the simultane- ously delivered from a cutting device (2), substantially in their delivery position and held by dropping to a conveyor (14), characterized in that the sheet metal strips on their upper side, and in particular only on their upper side, are held magnetically and / or by negative pressure ge.

2. The method according to claim i, dadurcn gekenn¬ characterized in that the metal strips are held electromagnetically and / or permanent magnetic.

3. The method according to claim 1 or 2, characterized in that the metal strips are dropped by deactivation of the electrically generated magnetic field, by mecha¬ African action on the metal strips to overcome the permanent magnetic magnetic field or by deactivation of the negative pressure.

4. The method according to any one of claims 1 to

3, characterized in that the holding by Magneti¬ cal rollers (6-9) takes place, at which the respective sheet metal strip ent¬ lang during delivery from the cutting device.

5. The method according to any one of claims 1 to

4, characterized in that the holding by Magneti¬ cal rails (30) takes place, at which the respective sheet metal strip ent¬ long slips in the delivery from the cutting device.

6. The method according to claim 5, characterized gekenn¬ characterized in that the rails are provided with a sliding friction of the sheet metal strip on the rail lowering Be coating.

7. The method according to claim 1 or 3, characterized in that for holding by means of negative pressure at least one surface (38) with suction openings (37) is provided, which are connected to a vacuum source (31).

8. The method according to claim 7, characterized in that the surface is at least partially provided with a sliding friction of the sheet metal strip on the surface lowering coating.

9. holding device (10, 10 ', 10 ") for a sheet metal shears, which at the output of a cutting device (2) for holding a plurality of simultaneously discharged from the direction of cutting Schnei¬ sheet metal strip (21-24) in wesent¬ union in the discharge position and for passing on the metal strips by dropping them and providing them, characterized in that the holding device (10, 10 ', 10 ") holding means (5-11, 11, 30, 35, 31, 36, 37 , 38) which hold the metal strips on their upper side, and in particular only on their upper side, magnetically and / or pneumatically.

10. Holding device according to claim 9, characterized in that the metal strips are electromagnetically and / or permanently magnetically festhaltbar.

11. Holding device according to claim 9 or 10, characterized in that the metal strips are dropped by De¬ activation of the electrically generated magnetic field, by mechanical action on the metal strips to Überwin¬ tion of the permanent magnetic magnetic field or by deactivating the negative pressure.

12. Holding device according to one of claims 9 to 11, characterized in that the holding by magnetic rollers (6-9) takes place, on which the respective metal strip along the delivery of the cutting device.

13. Holding device according to one of claims 9 to 12, characterized in that the holding by magnetic rails (30) takes place, along which slides the respective metal strip during the delivery from the cutting device.

14. Holding device according to claim 13, da¬ characterized in that the rails are provided with a sliding friction of the sheet metal strip on the rail herabset¬ Zenden coating.

15. Holding device according to claim 9 or 11, characterized in that for holding means of Unter¬ pressure at least one surface (38) is provided with suction openings (37) which are connected to a vacuum source (31).

16. Holding device according to claim 15, da¬ characterized in that the surface (38) is provided at least in sections with a sliding friction of Blechstrei¬ fens on the surface decreasing coating.

17. Angle scissors (1) with a first cutting device (2) and a second cutting device (3) and with a holding device (10, 10 ', 10') arranged between the cutting devices according to one of claims 9 to 16 which feeds the metal strips (21-24) cut by the first cutting device (2) to a conveyor which conveys the metal strips to the second cutting device.