DE3111262A1 - Straight-knife cloth cutter for cutting up flat material - Google Patents

Abstract

Straight-knife cloth cutter for cutting up flat material such as cloths, films and the like, having a supporting column which guides a trevet oscillating in the vertical direction and via which a trevet drive is supported on a base plate, two trevet guides, enclosing between them a gap for receiving the trevet and having the form of flat strips, being arranged on the supporting column. To avoid using a drop-forging part for the supporting column, but nevertheless to construct and fit the latter such that the straight-knife cloth cutter withstands the stresses in use, a profiled bar with a continuously constant cross-section, on the lateral faces of which the trevet guides are mounted, is used for the supporting column. In addition, a recess for receiving the lower ends of the profile bar and of the trevet guides is provided in the base plate and the profiled bar is materially connected, especially welded, to the edge of the recesses.

Description

HO EG ER ·. * S-TEJ-I: R ¹ E CHT _& PARTNER

PATEN T * A N W * "ä L * Y E 'O I I I

UHLANDSTRASSE 14 c D 7000 STUTTGART 1

A 44 474 b Applicant: Krauss u. Reichert b - 177 GmbH + Co.KG

Feb. 17, 1981 Special machine factory

Stuttgarter Str. 68 7012 Fellbach

Straight knife machine for cutting flat material

The invention relates to a straight knife machine for cutting flat material such as fabrics, foils and the like, with a support bracket that leads to a vertically oscillating push knife which a push knife drive is supported on a footplate, with two a gap on the support bracket for receiving the push knife between them enclosing, the shape of flat strips having knife guides are arranged.

In known straight knife machines, the support is formed by a drop forged part, which Has molded flanges at the top and bottom, the upper one of which is attached to a housing of the push knife drive and the lower one is let into a recess in the footplate and screwed to it. The drop forged part was machined on all sides on the outside and provided with a milled longitudinal slot, in which an assembly consisting of two knife guides and a spacer bar arranged in between, riveted together is used. Although the support of the conventional straight knife machines is an extremely expensive component, it was previously of the opinion that this effort could not be dispensed with, since the support on the one hand must be narrow so as not to cut any

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au cause grosssn fabric Wielersport state and cutting iraa curvatures not zn behiaderaj, on the other s © its j © yet strong beaaspruefot and awar both to bending as well as torsion in the hand-held, electric Stossmessermasehinen rest of the heavy electric motor with its Gehäase on the TragstÜt2e _r In addition, a rearward-facing handle is attached to this housing, so that the operator also creates a tilting moment, and when cutting curves, the support is subjected to torsion, and because of the high weight of the machine and the sliding or rolling resistance of the footplate on the the table top that supports it and because of the resistance that the package of layers of fabric penetrated by the support support to a pivoting of the straight knife machine even to a considerable extent »

The invention was based on the task of improving the known push knife machines of the type mentioned at the beginning? that there is no need for a drop forged part for the support, but the support can still cope with the stresses described are placed that a © recess for receiving the lower ends of the profile rod and the knife guide is provided in the footplate and the profile rod is firmly connected to the edge of the recess. The profile bar could be glued in or soldered in, but welding is particularly beneficial ο Instead of an expensive drop forged part that is laborious to machine, there is a profile

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which is drawn or rolled material can act, by letting this profile rod in the footplate and welding the two Parts from above and preferably also from below results in a stable connection between the profile bar and Footplate, and by letting the knife guides into the footplate, not only does the resistance increase against a torsion of the support bracket increases, but prevents the lower ends of the knife guides relative to the in the entry slot provided on the footplate for the Dodge the lower end of the push knife to the side, which would destroy the push knife. The connection the support with the housing of the push knife drive is relatively problem-free, since the support at the top always protrudes from the material to be cut, so that there are reinforcement angles between can weld in the profile bar and the mentioned housing. As before, you can see one from below into the footplate recessed flange plate, then the mentioned recess for the knife guides and the profile rod incorporated into this flange plate and welded this to the profile rod. In this case, too it is advisable to design the recess as a continuous opening so that the profile bar can both can be welded to the flange plate on the top as well as on the underside of the flange plate.

In so-called horizontal splitting machines with a rotating band knife, it is known for guidance of the latter to provide a bar, placed on the top and bottom flat steel guide jaws and with

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the bar are screwed. This construction could However, there is no suggestion for solving the task at hand mediate ^ because at push-button machines with regard to The stress on the parts involved in the knife guide is subject to completely different conditions - in the case of horizontal splitting machines the knife guide only has to absorb the cutting resistance.

de »Resistance that a pile of fabric layers of the push knife machine When cutting, on the other hand, to keep it as small as possible, it is advisable to keep the profile rod on both sides to be provided with a longitudinal step £, the height of which corresponds to the thickness of the knife guides is equivalent to. In this way, the resistance of the support according to the invention is below that of known construction, since the latter has two forward-facing joints on each side, namely a first on the leading edge of the knife guides and a second on the leading edge of the die Longitudinal slot of the support supporting the knife guides "

Since the razeh oscillating © push knife heats up the knife guides strongly as a result of frictional heat, which goes so far that the hardened flat steels forming the knife guides tarnish and therefore become soft the Messerführu & gen by screws interchangeably on the Tragsfcütze forming section bar attached, "in contrast to the known ©" straight knives machines "in which the beidea blade guides with the interposed therebetween Distan ^ strip riveted SINEL therefore be

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easily replace the knife guides individually in the straight knife machine according to the invention.

Oa the hardened flat steels forming the knife guides must be ground on both sides, recommends it is to design the support so that the profile bar cross-section between the knife guides Tapered to a wedge shape at the front, so that the flat steels are then ground plane-parallel in the area of the contact surface can be.

Further features, advantages and details of the invention emerge from the appended claims and from the following description as well as the accompanying graphic representation of two preferred embodiments of the invention Straight knife machine; show it:

1 shows a diagrammatic representation of a first embodiment of the straight knife machine according to the invention ;

Fig. 2 is a side view of the support bracket of this machine provided with the knife guides;

3 shows a section along the line 3-3 in FIG. 2; Fig. 4 is a section along the line 4-4 in Fig. 3;

FIG. 5 shows a representation corresponding to FIG. 3, but without knife guides; FIG.

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Figure 7 is a _o of Figure "2 corresponding view of a second Äusführungsform.

The jogging machine shown in general has in a housing 10 an electric motor (not shown) to drive a jogging knife 14 that is moved backwards in the vertical direction is attached to a footplate designated as a whole by 22. With this base plate, which supports the entire machine, the straight knife machine glides on the table top of a cutting machine when cutting flat material such as layers of fabric.

The support bracket 20 has a profile bar 24 a drawn or rolled steel profile, on the side M @ ss @ Eführung © n 26 made of hardened and gesehliffeaea Flat steel are put on »Below is aa d @ a profile bar 24 and a flange plate 28 attached which together with a so-called »cut plate @ 30 ia @ in @ recess on the top of the foot plate © 22 and like the © Sehnittplatte with the footplate is screwed.

Di © Fig _o 2 to S violin the support of this first ιform the

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machine in detail:

The cross section of the profile bar 24 has a mushroom shape with a head 24a and a wedge 24b, which with respect to the Knife guides 26 serves as a spacer. One of the contact surfaces 24c for the knife guides 26 to the rear limiting step 24d corresponds in its height to Thickness of the knife guides 26 in the area of their rear Edge. Finally, in the area of the wedge 24b of the profile bar 24, threaded bores 24e are one above the other and 24f are provided, which are alternately angularly offset from one another, as is particularly clear 6 can be seen, so that in the vertical direction successive threaded bores in each case run alternately perpendicular to one of the contact surfaces 24c.

As can be seen particularly clearly in FIGS. 5 and 6, the lower flange plate 28 has one in its Shape of the cross-section of the profile rod 24 adapted, through opening 36, to which towards the front a slot 38 for the push knife to pass through and recesses 40 in the form of steps towards the side connect, which together with the profile bar 24 each have a groove for inserting one of the knife guides 26 form. To fasten the lower flange plate 28 to the profile bar 24, the latter is inserted into the opening 36 inserted, as shown in FIG. 6, whereupon the two components go around the head 24a, however weld seams extending only up to steps 24d 42 and 44 are connected to one another on the top and bottom of the flange plate 28.

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remains, the flange plate 28 at the front a step 46 sum insertion of the cutting plate has, and the attachment of flange plate 28 and cutting plate 30 to the footplate 22 are used in Screws 50 indicated in FIGS. 1 and 4. As FIG. 1 shows, the cutting plate 30 has a slot for the push knife 14 to pass through and can therefore, as usual, form a counter knife for the push knife 14.

As FIG. 2 shows, the upper end of the profile rod is 24 welded to an upper flange plate 52 and a stiffening bracket 54, so that after the screwing of the flange plate 52 to the housing 10 a rigid connection between the latter and the support tube 20 results.

According to a further feature of the invention take in the first Äusführungsform according to FIGS. 1 to 6 Distances of the threaded holes 24e, 24f and thus the Fastening screws 56, with which the knife guide are mounted on 26 sun profile rod 24, from above downwards (see in particular FIG. 2), since these knife guides are subject to far greater stress in the lower area are than in the middle or even upper area, then the push knife 14 acts thanks to the bottom Design of its cutting edge 14a also as a chopping knife » Finally, it is advisable to use the conventional® Blade arm 26a of blade guides 26 course over their lower end into an area 26b let go of "in which the cross-section of the knife guides 26 is rectangular in front? This measure

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makes it possible to make the cutting plate 30 simpler than before: these cutting plates point to their Upper side along the slot penetrated by the knife 14 each have a bead, the outer edges of which run obliquely inward in the known constructions in the direction of the knife guides 26, so that the bulges run out to a point. In the case of the straight knife machine according to the invention, these beads remain however, to the rear to be the same width if its width is the thickness of the knife guides in the rectangular Corresponds to areas 26b, since a smooth transition then results.

When producing the lower flange plate 28, it is expedient to proceed in such a way that the slot Mills only after the flange plate has been welded onto the profile bar 24.

If the support 20 is subjected to torsion when cutting a curve, the knife guides 26 do not move laterally, since their lower ends through the recesses 40 relative to the slots in the lower flange plate 28 and are held in the cutting plate 30, so that it is ensured that the push knife 14 can always enter this Sdalitze. Is used, for example, by a downward-facing one Pressure on the guide handle 18 stresses the support bracket 20 in bending, so can by the Letting the lower ends of the knife guides 26 into the lower flange plate 28 does not move forward opening gap between the knife guides 26 and the lower flange plate 28 arise, which is why.

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is important because otherwise they will never be in this gap completely avoidable, not cut threads of fabrics to be cut would get caught.

The variant of erfindungsgeraäßen support bracket shown in FIG _o 7 differs only in a point of the support bracket of the first embodiment, so in the following only the differences are described.

In this embodiment, the knife guides 26 'are designed symmetrically with respect to a horizontal center plane,'"'why the fastening screws 56" ■ are continuously arranged at the same distance from one another and both the lower and the upper areas 26b ^{1 of} the knife guides 26 ^? have a rectangular cross-section at the front. These measures make it possible to reuse the knife guides that have been worn due to the increased stress in the lower area by interchanging the two knife guides and mounting them in reverse on the same side, ie with the ends that were previously at the bottom facing up.

Due to the inventive design of the support, the manufacturing costs can be compared to the conventional, Lower the forged support tubes by about half, which shows the rapid progress, which was achieved by the invention.

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Claims (1)

OO β β ο ο οββο οοβ ag οο no βοο <I i I / V ^} PATENT LAWYERS OlllZDZ UHLANDSTRASSE 14 c D 7000 STUTTGART 1 A 44 474 b applicant; Krauss and Reichert ^b "177 GmbH + Co.KG February 17, 1981 Special machine factory Stuttgarter Strasse 7012 Fellbach Proverbs: Straight knives machine sum cutting leading support post _s supporting sheet material such as fabrics ,, films and the like, with an oscillating in the vertical direction Stossraesser on the check a Stossmesserantrxeb on a base plate, wherein a gap znz Äufaaiime the shock diameter therebetween einsehiiessende on the carrier support two <, Knife guides having the shape of flat strips are arranged, characterized in that the support (20) consists essentially of a profile rod (24) of constant cross-section, on whose side surfaces (24c) the knife guides (26) are placed A recess (36 "40) for receiving the lower ends of the profile rod (24) and the knife guides (26) is provided in the footplate (22) and the profile rod is firmly connected, in particular welded, to the edge of the recess (36). Machine according to Claim 1, characterized in that the profile bar (24) has a step (24d) running in the longitudinal direction on both sides, "the height of which corresponds to the thickness of the knife guides (26)" 2 - - - w - * r V V V U V 3. Machine according to claim 1 or 2, characterized in that the knife guides (26) by means of Screws (56) are fastened interchangeably on the profile bar (24). 4. Machine according to one or more of claims to 3, characterized in that the footplate (22) has a flange plate (28) let into it from above, which forms the recess (36, 40) for the knife guides (26) and the profile rod (24) and with which the latter cohesively connected, in particular welded. 5. Machine according to claim 4, characterized in that the lower flange plate (28) is a profile bar (24) has receiving opening (36) and that the two parts (24, 28) both open the top and bottom of the flange plate are welded together. 6. Machine according to claim 5, characterized in that the shape of the opening (36, 38) corresponds to the profile bar cross-section together with a slit in front for the push knife (14) to pass through and that on the top of the flange plate (28) on both sides of the opening in each case a step-shaped recess (40) is provided for receiving the lower ends of the knife guides is. OO »O β O O O β βθ ο Ct ο ο on ο OQ
Qo ο ο ο οθ α u 474 b °° ⁰⁰ °°° ^{% o} ° ^{% o} ° °° '° °°° 311 1262 b - 177 February 17th 1! Masehin Naeh © © INEM or more of the preceding claims, characterized gekennseiehnet that is profiled bar cross section between the Messerföh- (26) forward zn (at 24b) of wedge-shaped 8. Machine according to one or more of the preceding claims, characterized in that the upper end of the profile bar (24) is welded to an upper flange plate © (52) fastened to a housing (10) of the push knife drive and that the rear edge of the profile bar ( 24) and the flange plate (52) with a reinforcement & angle (54) are welded. - 9. Machine according to one or more of the above Claims, characterized in that the cross section of the knife guides (26) according to tapered at the front and outside the lower end regions (26b) tapers (at 26a) that the However, lower end regions (26b) at the front end with mutually parallel side surfaces. 10. Machine according to claim 9 _P, characterized in that the knife guides (26 ') are designed symmetrically in their transverse central planes.