DE1901999A1 - Circular shearing cutter for longitudinally - cutting of sheet metal and plastics - Google Patents

Abstract

Strip material delivered from coils is passed between pairs of adjustable circular shearing cutters for cutting narrower strips of set width. The circular cutter pairs are arranged each on a pair of cutter shafts laterally adjustable, and in succession in direction of conveyance. The cutter pairs are pref. mounted on successive shafts laterally staggered to form regular or irregular cascades.

Description

Circular knife scissors The invention relates to circular knife scissors for longitudinally dividing flexible materials, in particular sheet metal, plastic or the like. Existing bands that are unwound from material rolls, so-called coils, between several pairs of transverse to the belts adjustable, the belts in strips Selectable width cutting circular knife pairs passed through and then on Supply rolls are reeled in with the circular knife scissors commonly used today are several side by side on two parallel shafts driven in opposite directions Circular knife pairs attached, the lateral spacing of which the widths of the tape strips correspond. The knife disks are on the knife shafts with the interposition of Placed spacer rings, the number and thickness of which correspond to the lateral distances between the pairs of knife shafts and thus determine the bandwidths.

Since, under certain circumstances, a high degree of accuracy for the further processing of the tapes the width of the strip is required necessarily the Spacer rings should be dimensioned as precisely as possible. Above all @ can even with low Manufacturing tolerances when lining up the spacer rings as a result of the potential Summing up rectified tolerances, errors appear so considerable that the cutting knives belonging to one another in the knife pairs do not b @@ obey each other and are unclean Create cuts. For this reason and because of the insufficient accuracy With the width setting, the strips produced may not be able to be further processed will.

Even the work outlined above for a clean assembly the circular knife on its shafts is quite inconvenient as it is one in relation to the pure working time the scissors takes up too high dead time one after the other several coils with the same strip widths cut into strips of the same width, the relatively long set-up time can be accepted if necessary. However, as soon as after strips of other widths are to be cut in a cutting operation the pairs of circular knives are converted, d. H. those sitting on the common shaft Knife and the spacer rings must be removed, in order then under interposing other spacer rings corresponding to the new strip widths have been put on again will. These changeover times, which usually last several hours, are used for actual working hours The more often strips of different widths are to be cut, the more often it is lost.

These changeover times also occur, if only one the circular knife that is defective or blunt is replaced by a new circular knife must earth. Then it comes that the diameter of the circular knife b: i repairing and regrinding become smaller, so that in the course of time a whole series of reground circular disks arise that have different diameters.

Since the circular knives are now sitting next to each other on the common shafts, If they have different diameters, do not reach evenly deep into what is to be cut Tape a.

About this error, which occurs with larger bond strengths and relatively small ones Differences in diameter gPf. does not matter, to testify, it is cramped, to make the knife shafts adjustable relative to the bend surface.

But now all knife soles sitting on the common shaft are driven at the same speed, is the peripheral speed of the circular knife different under biodiversity. As a result, the tape daa is moved by the circular knives when cutting, is driven unevenly. Apart from the fact that this in turn produces imprecise cuts in the case of knives with a circumferential speed deviating from an established mean value an undesirable strong grinding of the cutting edges, and that has in addition to a u. U. dangerous temperature increase, the circular knives quickly become unusable result.

To avoid all of this, the circular knives are ground off sorted into groups of the same diameter, in order to then be installed together to be able to.

It is therefore an extensive inventory of circular knives different, the same diameter is necessary.

In addition, the known arrangement has the disadvantage that it becomes unusable eiiies circular knife and with the consequent stopping of the machine during the cutting process The tape that is located must be cut across, and that the still to be processed The piece of tape has to be re-threaded, so to speak.

The invention aims to provide a circular knife scissors of the known To create a way that avoids the disadvantages explained above with a simple structure.

The invention consists primarily in the fact that the circular knife pairs on one pair of knife shafts each laterally adjustable and essentially in rderricbtung are arranged one behind the other.

As a result of the arrangement of the knife pairs on one pair of knife shafts each The knife pairs kdmien completely independently of the other I-fesser pairs by lateral Shift on their knife shafts set exactly on the associated cutting line The preparation of the strip widths required in each case is therefore conceivable simple and costs extremely short lost time. Especially if one fails Knife only necessary to change this knife and its counter knife. This The process therefore also requires only a short time and a correspondingly short one Interruption of the cutting process. It is essential here that it is not necessary to cut the tape in the cutting process transversely, there cutting after replacing the defective pair of circular knives in the same place can be continued @ t @ t at which it was interrupted.

Arranging the pairs of circular knives one behind the other has the advantage of that the dimensions of the knife carrier are completely reduced when the side is adjusted is independent. This is made possible by the choice of any lateral distances To cut Streifan of any and, above all, very small width. One is too not forced to use narrow knives for smaller strip widths, it is Rather, wider and therefore more stable knives of greater strength are easily possible and use less wear and tear, so the number of failures is very low is held.

It is true that with a special construction it is possible to cut pa @ eten known domed sheet metal, the pairs of circular knives each individually and laterally shiftable to store and drive, see the German patent document 622 952, however Here the knife carriers are arranged next to each other, so that one with respect to the width of the strips depends on the lateral dimensions of the knife carrier.

In addition, this is known for cutting long strips unsuitable construction of cutting all knives simultaneously in one line, while in the opposite of the invention, the pairs of circular disks temporally and spatially come into effect one after the other. That has a homogenization of the drives that tension exerted on the ribbons and the cutting operations.

The laterally offset one behind the other according to the invention Circular knife pairs offers the other compared to the aforementioned known knife scissors Advantage that the circular knife scissors not only vary as required in a very short time, d. H. can be converted, but that also the number of possible strip rolls is not dependent on the bandwidth and can therefore be very large. That on in this way it is possible to cut the ribbons into very narrow stripes very important than the following processing machines, such as punching, pressing or the like, continuously feed the smaller workpieces into corresponding narrow belts can, so that these operations are more efficient than before.

The arrangement of the cutting knife pairs one behind the other finally has the Advantage that the circular knife scissors are built according to the modular system and are arbitrary can be changed and supplemented.

This arbitrary changeability offers the possibility of the arrangement of the circular knife pairs to the respective operational and structural requirements. In this way, the pairs of circular knives can work on the knife shafts arranged one behind the other be attached so laterally offset that they are regular or irregular Form cascades.

In order to fully utilize the bandwidth, it is advisable to use two knife shaft pairs, each carrying a pair of circular knives, side by side across the belt arrange.

When cutting wide and thick strips and the resulting It can be inexpedient to use particularly wide and stable circular knives be that Circular knife disks on overhung shaft pairs to attach. U'a to overcome this difficulty, the invention proposes a or to let several pairs of knife shafts reach over the bandwidth and to their to store free ends in a replaceable and movable abutment.

In order to achieve that with certainty all broad knives in the same way engage the band to be divided, d. H. the same depth of cut own, the Drehiohlen of the knife shafts can be regulated in such a way that all circular knives have the same peripheral speed.

The regulation of the peripheral speed can be done in different ways take place. So the pairs of circular knives can be connected to a continuously variable transmission be connected to a common drive or each have a single drive.

The drives can be mechanical or electric or hydraulic, in particular oil-hydraulic type.

In any case, the speeds of the knife shaft pairs are within the meaning of the invention and thus their peripheral speeds compared with one, the material and the strength of the strips to be cut, adjustable speed standard electrical, electronically, electromechanically, electrohydraulically or similarly controllable.

The circular knife scissors according to the invention differ particularly in this way essentially of the scissors according to the German patent specification already mentioned above 622 952 and from a drive for circular knife shears according to the German Patent specification 906 769. There is one setting in the bone knife scissors The circular knife of each pair is provided relative to the plane of the tape, however, none suggests of the patents mentioned the need to include all pairs of circular disks set the same peripheral speed.

This is even the case with the arrangement according to the last-mentioned patent specification impossible, since with her all circular knife scissors with a common shaft in stylish and constant drive connection.

similar to the drive according to the patent mentioned last the circular knife shafts can be rotatably mounted in Tragbdoken, which on each other parallel rails are slidably arranged. However, while at this well-known Drive the rails are arranged transversely to the belt conveyor direction, so that only one son dependent on the dimensions of the trestles, so limited lateral offset the pairs of cutting blades mm are the same, lie in the design according to the invention use the circular knife scissors to move the rails lengthways. But that has the one explained above Freedom of movement with regard to the number of cutting units, their lateral offset and consequently the choice of the stripe width.

Further structural features of the invention emerge from the following Description of circular knife scissors according to the schematic drawings. In these show fig. 1 a conventional type of circular knife scissors in a front view, FIG. 2 the same Circular knife scissors in plan view, 3 shows the same pair of scissors in context with the reels, FIG. 4 shows a circular knife scissors according to the invention in a front view, 5 shows the same circular knife scissors in plan view, FIG. 6 shows the same circular knife scissors together with the Ifaspeln, Fig. 7 a further circular knife scissors according to the invention in front view and FIG. 8 the same circular knife scissors in plan view.

The circular knife scissors shown in Figs. 1 to 3 has a Frame 1, on the one hand a, a drive motor and an intermediate gear containing Frame part 2 and on the other hand a frame part 3 containing an abutment. In the frame parts 2, 3, when knife shafts 4, 5 are arranged one above the other, they can be rotated stored. On the knife shafts 4, 5 side by side, side-by-side adjustable five pairs of circular knives 6 attached, the cutting of which is a small amount overlap, and between which a tape 7 is passed in the direction of arrows A. will. During the passage the band 7 becomes in strips 71 to 76 of selectable width cut up. To determine the strip widths and at the same time for clean, The setting of the circular disk pairs 6, which cannot be changed during operation, is used between the circular disks 6 and the frame parts 4, 5 on the cutter shafts 2, 3 lined up spacer rings 8 of different strengths. Depending on the arrangement, number and Thickness of the spacer rings 8, the strips 71-76 have the widths a to f.

The material strip 7 is rotating in opposite directions in the direction of the arrows B-C driven circular knife 6 from one Material roll (coil) 9 unwound, moved in the direction of arrow A, cut and one or more rewinders (Supply rolls) 10 supplied. In front of and behind the circular knives there can be pairs of guide rollers be arranged.

The above-described circular knife scissors have, as without further ado recognizable, the mandatory requirement that all circular knives have the same diameter own. Must one of the circular knives because of a defect or as a result of becoming blunt be replaced, then all circular disks sitting on the same knife shaft have to be replaced can be dismantled in order to reassemble exactly after installing a new circular knife and to be used. Further disadvantages of this arrangement are described above been.

The circular knife scissors according to the invention shown in FIGS. 4 to 6 has a base plate 11 on which four pairs of opposite one another Trestles 12 to 19 are built. These trestles can be fixed or slidable be connected to the base plate II.

While a trestle 12 is equipped with a motor and corresponding gears is, the opposite block 16 contains only abutments. All other trestles 14, 15, 17 »19 each contain a drive motor and an intermediate gear. In the trestles 12, 16, two continuous knife shafts 20 are rotatably mounted on top of one another, while in the support brackets 14, 15, 17-19, one above the other, one pair each of which are cantilevered Blade shafts 21 to 26 are rotatably mounted. There is one on each cutter block Pair of circular knives 27-33 with slightly overlapping cutting edges but fastened in a laterally adjustable manner.

The rotors contained in the trestles 12 to 15 and 17 to 19 are adjustable with respect to their speed so that they are driven in opposite directions Circular knife pairs 27 to 53 have the same peripheral speed.

The pairs of knives convey the strip of material 34 to be cut into Direction of arrow A, hai, eln it from a material roll (coil) 35, cut it into eight strips 34a-h of different widths and reel them produced strips on a supply roll 36.

In contrast to the arrangement according to FIGS. 1 to 3, the circular knife pairs come not on the same side, but in pairs one after the other with the material strip 34 in Intervention.

In order to prevent any corrugations and congestion caused by this, can be arranged in front of, behind and, if necessary, between the interfaces, pairs of guide rollers 37, 38 will.

The arrangement described allows it by shifting the transverse Trestles and / or the knife shafts to set any strip width. If you want to cut a few wider strips, you can use an or several pairs of knife shafts ineffective by lifting the trestles or the bearings do. Instead of just one pair of continuous knife shafts, several can also be used provide for such pairs.

Replacing defective or badly worn circular knives is in To accomplish in the shortest possible time that only that which is no longer usable in each case Circular knife pair is exchanged. In particular, pairs of circular knives can be different Diameter can be installed if you ensure that the peripheral speed all knives are the same. Rierftir required funds, for example Frequency comparators, are known and therefore do not need to be discussed.

The embodiment according to FIGS. 7 and 8 is essentially correct Features with that of FIGS. 4 to 6 match. In this embodiment an approximately U-shaped frame 41 is present, in the side walls of which the supply roll (Coil) 42 and the reel roller 43 are rotatably and lockably mounted. the Upper edges of the frame are at least partially designed as rails 44 which can be moved and adjusted lengthways and crossways with three pairs of opposite sides Yragb8cke 45-50 are arranged. These are all motorized and flying equipped knife shaft pairs, each carrying a pair of circular knives.

These cut the unreeled from the material roll 42 through them Tape 51 in seven strips and reel them onto the supply roll 43.

For lateral and height adjustment of the carrier and / or handwheels 52, 53 are used for the knife shaft pairs mounted in them only indicated dial gauges 54 4 for the exact adjustment of the circular knife distances the respectively desired width of the tape strips to be cut is provided. Because it it is necessary to keep the traveling speed constant during the cutting process Tape 51 must comply with the roll of material 42 due to its decreasing winding diameter are braked, while vice versa the supply roll 43 as a result of the increasing Winding diameter must be accelerated. The purpose of energy recovery is for example for braking a gear connected to the material roller 42 Brake generator 55 is provided, which is electrically operated with a drive motor 56 of the supply roll 43 is connected.

Claims (14)

P a t e n t a n s p r ü c h e 1. Circular knife scissors for longitudinal dividing of flexible materials, in particular from sheet metal, plastic and the like consisting of strips that are made of material rolls, so-called coils, unwound, between several pairs of across the strips adjustable pairs of circular knives that cut the band into strips of selectable width passed through and then reeled into supply rolls, d u r c h g It is not noted that the pairs of circular knives (6, 27 - 33) each work on a pair of knife shafts (4, 5; 20-26) laterally adjustable and essentially one behind the other in the conveying direction (A) are arranged. 2. Circular knife scissors according to claim 1, d a d u r ch g e k e n n that the circular knife pairs (16; 27-33) on the knife shafts arranged one behind the other (4, 5; 20-26) are attached laterally offset in such a way that they are regular or form irregular cascades. 3. Circular knife scissors according to claims 1 and 2, characterized in that that in each case two pairs of knife shafts carrying a pair of circular knives next to each other across the belt are arranged. 4. Circular knife scissors according to response 1 and 2, characterized in that that one or more pairs of knife shafts (20) extend over the bandwidth and / on their free ends mounted in an exchangeable and displaceable abutment (16) are. 5. Circular knife scissors according to claims 1 to 4, characterized in that that the knife shafts ede's.Messerpaares vertical to the strip plane against each other the same cutting plane can be set. 6. Circular knife scissors according to claims 1 to 5, characterized in that that the speed of rotation of the Nesser shafts can be regulated in such a way that all, clean Ereimmesaer have the same peripheral speed. 7. Circular knife scissors naoh the Misprüchen 1 to 6, characterized in that that the circular knife pairs via continuously variable transmission with a common Drive are connected. 8. Circular knife scissors according to claims 1 to 6, characterized in that that the pairs of circular knives each have a single-cable drive. 9. Circular knife scissors according to claims 1 to 8, characterized in that that the drives of the circular knife pairs such mechanical, electromotive or hydraulic, in particular oil-hydraulic type. 10. Circular knife scissors according to claims 1 to 9, characterized in that that the speeds of the Nesserwellepaare and thus their peripheral speeds under. Compare with one, the material and the thickness of the one to be cut Belts adjustable speed standard electrical, electronic, electromechanical, are electrohydraulically or internally controllable. 11. Circular knife scissors according to claims 1 to 10, characterized in that that the circular knife shafts are rotatably mounted in trestles (, 2 - 19; 46 - 50), the rails (44) parallel to the belt conveying direction are displaceable in the longitudinal direction arranged and with the exception of the trestles (16) serving as an abutment with drives or gearboxes are equipped. 12. Circular knife scissors according to claims 1 to 11, characterized in that that the trestles with adjusting devices designed as levers or cranks (52-53) are equipped for lateral and height adjustment of the knife shafts. 13. Circular knife scissors according to claims 1 to 12, characterized in that that the trestles with precision measuring devices (54), preferably designed as dial gauges are provided to indicate the lateral position of the pairs of knives. 14. Circular knife scissors according to claims 1 to 13, characterized in that that they are connected to an electrical or oleohydraulic energy generator ci 'the converter is equipped, the energy gained when braking the decoiler to the aluminum drive the reel feeds.