DE7614153U1 - PUSH KNIFE CUTTING MACHINE FOR FLAT MATERIAL - Google Patents

Description

OI * L..INO M. SC J DJPVf-VMiIi-JOfI: "'.". * TJlVt, -PMV ·.

HÖGER - LEGAL RIGHT - G ^ IEB'SÖACM - ^ AECKER

PATENT LAWYERS IN STUTTGART

A 41 624 b

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April 21, 19 76

Krauss α. Reichert s

Special machine factory <

Stuttgarter Strasse 6 8
7012 Fellbach

Straight knife cutting machine for flat material

The invention relates to a straight knife cutting machine for Flat material, with a knife guide extending downward from a machine housing for the push knife, a vertically displaceable hold-down device for the flat material, one resting on the latter Has retainer, and with one attached with its lower end to the hold-down device, together with this

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Slidable knife protection for the cutting edge of the straight knife.

In the commonly used straight knife cutting machines, the cutting edge of the straight knife is unprotected, which has already resulted in serious accidents at work. A cutting machine of the type mentioned has therefore already become known (hand-operated straight knife cutting machine from Wolf Machine Company, Cincinnati, Ohio, USA), the knife guard of which has the shape of a hood made of acrylic resin with a U-shaped cross section when viewed from above. Because this hood includes the knife and the knife guide from the start
and extends down when cutting up to the uppermost layer of the flat material can that point at which the straight knife cutting edge in the to be cut flat material is immersed _f will not be seen after a short time by the operator, since the dust generated during Zut><juiiciuei νοϊΰ Ctcc3Ktc3Gcr, Fibers and the like are mainly deposited on the inside of the hood, so that it becomes increasingly opaque. But then there is a precise cut
no longer guaranteed.

Furthermore, since the hood with the hold-down device must be able to be pushed up, it is necessary for it to be quite expansive
to be dimensioned, otherwise the machine housing would prevent it from being pushed up. Such a sweeping knife guard is contrary to the endeavors of the operator to keep the material to be cut as close as possible with one hand
Grasp butt knife and push down.

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The invention was therefore based on the object of a floss protection for straight knife cutting machines to develop the

and the handling during cutting, the <5uscnuttingaccuracy / not impaired. Starting from a cutting machine of the type mentioned, this object is achieved according to the invention in that the length of the extending along the exposed straight knife cutting edge The knife guard is changeable and its lower end is designed in such a way that a short area of the bumpers over the hold-down device can be viewed directly from the side. There

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according to the invention, the length of the knife guard or that Part of the knife guard that extends from the area of the machine housing down to the hold-down device, must be changeable, the knife guard can be attached directly in the area of the straight knife cutting edge without that he is a tlochschieben the hold-down device or the :: hindered or made impossible. Since the! Lessersci.utz aussordeni a short area of the push knife above the Leaves the hold-down device free, the line to be cut must be followed closely at all times without the protective function being impaired by this admission of the knife guard would be reduced, because usually there is a hold-down device than the upwardly curved one and the cutting edge of the Gtossmesser comprehensive bracket formed so that there is no risk of an operator directly inadvertently over the flat material to be cut your hand touches the knife. Of course you have to the '.esserschutz upwards' does not necessarily go as far as the Maschinengeiü'.use extend, namely when the straight knife cutting edge is not exposed as far as the machine housing, as is the case, for example is the case with such straight knife cutting machines, where there is a grinding device under the .Maschinonjehäuse for the straight knife cutting edge, which consists of a upper rest position lowered down along the Htoss knife and then raised again to sharpen the working straight knife cutting edge. With those, with one Provide movable grinding device along the push knife Cutting machines, it is recommended to use the knife guard, the effective area of which has a variable length to connect the grinding device. In the simplest case, this means that the upper end of the Hesserschutz on the

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Grinding device is attached so that the knife guard; only approximately from the hold-down device to the grinding device

stretches. I.

A simple, safe and not bulky embodiment | The! lesserschutz consists of at least one on the one hand Side of the straight knife arranged and over its cutting edge protruding forward, flexible tape, in which it is; ' is preferably a metal band. If the cutting machine is hand-held, so that one hand of the operator is on a handle of the cutting machine, it may be sufficient to only use one side of the straight knife Attach a knife guard to prevent injuries to the other hand. In a preferred embodiment of this Cutting machine, the knife guard consists of two such straps attached to both sides of the bumper are. Practice has shown that relatively thin flexible tapes are completely sufficient if one ensures that that they cannot move backwards if one touches the longitudinal edges of the ligaments pointing forward and in In the direction of the straight knife cutting edge. However, such flexible tapes can be easily after the Divert the page or roll it up so that it allows the grinder to lower. To guide the tapes To avoid it at the back, it will usually be sufficient to fasten the ends of the tape and keep the tapes taut between these ends to tension.

Although you could arrange the bands at a lateral distance from the cutter, it is more useful if each band against _s

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the adjacent side surface of the push knife uncf / or the Knife guide is applied, the term knife guide in this context also including the usual supports between a footplate and the machine housing should include.

By the length of the exposed straight knife cutting edge recommends not to reduce a certain maximum height of a fabric layer package or the like through the knife guard it is to articulate the lower end of the belt on the hold-down device, with the hinge axis parallel to the plane of the Ribbon and perpendicular to its longitudinal direction. When the hold-down device is raised, the lower Swivel Bandendu outwards around the mentioned axis so that no cutting height is lost due to an otherwise unavoidable bending radius of the tape.

As such, one could move a window in the band around the each directly above the flat material to be cut to be able to see the area of the push knife directly. It is easier, however, if the tape is at a short distance from the Hold-down ends above this.

The knife protection according to the invention can, in addition to the shape of a or several flexible straps or a telescopic rod that runs in the area of the Stossmeöser cutting edge, have numerous other forms: The knife guard can be of a zigzag-shaped, lengthwise the push knife can be shortened or lengthened element made of wire or strip-shaped material. In the simplest In the case, the knife guard then has the form of a helical spring surrounding the push knife including knife guide. Even flatter

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However, under certain circumstances, a sensor protection can be used between Press down holder and machine housing together when it comes out Components is composed of strip-shaped material, which surround the push knife like a fork or a circular ring. In any case, the knife can be designed in such a way that the grinding device passes through the knife guard Push knife can run along. However, it is also possible in these embodiments to place the knife guard on top of the grinding device to attach. Instead of the telescopic rod mentioned above, finally in front of or next to the Straight knife cutting edge also a rigid rod can be arranged as knife protection, which penetrates the grinding device and as a result, a lowering of the grinding device is not hindered.

In the known push knife cutting machine described above is on the handle attached to the Maschinengoh.'iuse a switch for the Schossmesserantrirjb provided, the be .km Detecting the handle is actuated and when releasing the Handle switches off the Gtossmesserantricb. This is true already a step forward, but this measure cannot prevent the hold-down and thus raised plexiglass cover the cutting edge of the current Bump knife is exposed - it is now proposed, according to in the event of an add-on, press the switch for the Push knife drive with a mandrel liodienungselement for lowering to couple the hold-down so that switching off the push knife drive causes the hold-down to be lowered. If you drive such a cutting machine from the cut Flat material and then switches the stone drive the hold-down device falls at the same time under its own weight and then pulls the knife guard in front of the straight knife cutting edge so that it is up to the

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Moment is protected by lifting the hold-down device in order to move into a layer of fabric package or the like again. As the usual hold-down devices on one in front of the bumper extending rod are attached and this to a certain extent inadvertent contact with the push knife — cutting edge prevented, the described measure is of course also with machines without a special one Knife protection an advantage.

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Further features, details and advantages of the invention emerge from the attached claims and / or the two lying graphic representation and the following description of two preferred embodiments of an inventive Straight knife cutting machine; show it:

Fig. 1 is a perspective view of a first

Embodiment of the cutting machine with two flexible tapes as boiler protection;

Fig. 2 is a side view of the lower part of the

Maschinenciehäuses, the support and the footplate the cutting machine, seen in the direction of arrow A in Fig. 1;

Fig. 3 is an end view of the grinding device and the j

these adjacent parts according to arrow B in Fig. 2,

! However, the right part of FIG. 3 is a

Modification of the embodiment according to Figures 1 and 2 shows;

Fig. 4 is a section along the line 4-4 in Fig. 2; Fig. 5 is a section along the line 5-5 in Fig. 4;

l'ig. G is a view of the handle of the cutting machine and the parts surrounding it according to arrow C in FIG. 2;

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Fig. 7 is a highly schematic, according to the side view 2 corresponding representation of a further embodiment of the cutting machine according to the invention, and

FIG. 8 shows a representation of this embodiment corresponding to FIG. 4.

The cutting machine shown in FIGS. 1 to 6 has a machine housing 10 on which handles 12 and 14 are arranged and which is carried by a footplate 18 via a support bracket 16. 2 shows that rollers 20 are mounted on the underside of the footplate 18. As best shown in FIG. 4, the support has a longitudinal slot 22 which is open to the front and which receives a knife guide 24 consisting of three parts, in which a pusher 26 is longitudinally arranged. Diu aut> Jei I it; 01. ^ ίΣ'άΙιϋ Uii ^ licrciUGrcigcndc cutting edge of the straight knife was designated with 26a (see also Fig. 2). As not shown in detail, the footplate 18 has an opening into which the lower end of the push knife penetrates when it approaches the bottom dead center of its oscillating movement generated by an electric motor housed in the machine housing 10 and a crank drive.

In the machine housing 10, a rod 28 is displaceable in the longitudinal direction out, which is part of a hold-down device for the flat material to be cut and at its lower End of a bow-shaped hold-down device 30 carries. The machine housing 10 contains a brake, not shown, for the Rod 28, which by actuating an operating lever 32 (see

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2 and 6) can be released so that the hold-down _{device 28 r} 3o falls down under its own weight, either into the position shown in FIGS rests. In order to release this brake, the operating lever 32 according to FIG. 6 is moved to the left in the direction of the handle 12. Above this handle there is a switch 3 4 on the machine housing Io for switching the electric motor driving the push knife on and off, and this switch penetrates a window 36 in a slide 38 guided on the machine housing, which is designed and arranged in such a way that when the switch is switched 34 from its switched-on position (I) to its switched-off position (O), the operating lever 3 2 is moved to the left by its nose 3 8a of the slide counter to the action of an operating lever return spring (not shown) according to FIG. 6. As a result, the brake for the hold-down device is released, so that it falls down and, in particular, by means of the rod 28, already shields the push-knife cutting edge to a certain extent. One could, however, attach a z ^T - ⁱ e ' ⁱ⁴ " ^c ' w =><=<=>» m ς, - ^ hi p> h <= r T8 so that its two noses enclose the operating lever between them Of course, the force that holds the switch 34 in its off position must be greater than the restoring force of the operating lever 32. The operating lever 32 would then turn off the push knife drive, with the hold-down device 28.3o falling down at the same time and inevitably.

At the bottom of the machine housing Io is one as a whole with 4o designated grinding device is provided, which is driven by the push knife drive and along the push knife can be lowered and raised again to sharpen its cutting edge 26a. Since such grinding devices are to be assigned to the state of the art, no further explanations are required; it just needs to be mentioned that the

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Grinding device could be designed, for example, as described in U.S. Patent 3,233,371. In a longitudinal slot 37 of the machine housing 10 is a Handle 39, which is connected to the rod 28 of the hold-down device and allows the hold-down device 30 to pull up. Two support brackets 41 are now attached to this handle, on which the upper ends are fastened with screws 4 4 two thin and therefore flexible metal strips 42 are attached, which in the embodiment according to FIGS form the erf induncjsgomässen knife protection. In minor At a distance from the hold-down device 30, two pivot pins 46 are fastened above this, around which two L-shaped brackets 4 8 are pivoted be able. The lower ends of the metal strips 42 are fastened to these brackets. Finally, the grinding device 40 for each of the!, two guide rollers 50 and 52 on the Lowering the grinding device lift the metal belts 42 from the side surfaces of the push knife 26 and leave room for the Above the pulleys 50 arranged grinding stones or Create grinding belts of the grinding device 40. When starting up of the hold-down device 30 from the position shown in FIGS. 1 and 2, the length of the metal strips 42 is therefore located not, but only the length of those tape areas that are against the side surfaces of the push knife or the knife guide and the support 1C rest.

Tension ir.nn you metal strips 42 between the support brackets 41 and the bracket 48, so they cannot adjust to the rear, when the front longitudinal edges 42a of the metal strips are touched, so that these provide effective protection against cuts Offer.

Thanks to the fact that the metal bands 42 spaced above the

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End hold-down device 30, a short piece of the push knife is always visible above the material to be cut. Thanks to the j. Fact that the lower Dandenden outwardly folded v / ER f the can, you lose in the illustrated Stossmesser-} machine nothing to maximum height to be worked | Packs of material layers, because when the hold-down device is moved upwards, the brackets 4 8 are pivoted into a horizontal position so that the hold-down device 30 can be pulled up just as much as if the knife protection according to the invention were not present. When the hold-down device is fully raised, the two brackets 48 then lie in a horizontal position above the deflection rollers 50 and between the deflection rollers 52.

The right half of FIG. 3 shows a variant of the embodiment with flexible strips as knife protection: this variant takes the place of the pulley 52 a barrel 52 ', on the circumference of which the upper end of the right of the two metal strips 42 is attached so that the barrel 52 'holds the metal band under tension and rolls up when the hold-down ι device is raised. i

Instead of a barrel, a simple mandrel can also be used if the band 42 is made of a spring material and has such a residual stress that its upper end rolls up by itself; are particularly suitable Ribbons made of spring steel.

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7 and 8 show only schematically a second exemplary embodiment, in which a knife guard, designated as a whole as 42 ', is attached to the bottom of a machine housing Io' (it could also be the grinding device), which extends up to a hold-down device 3o '. extends and is attached at its lower end to the hold-down device. This knife guard has a zigzag shape in the extended state in the side view and it consists of thin, preferably punched out and elastic platelets 42a ¹ made of sheet metal, plastic or the like, which grip the push knife 26 'in a fork-like manner and each have a hole 42b that extends from one of the Hold-down 3o 'carrying rod 28' is penetrated. As Jüsst can clearly see in FIG. 7, the knife guard s2 'also allows a clear view of that area of the straight knife cutting edge which is located above the material to be cut.

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Claims (14)

A 41 624 b b - 163 21. ADril'1976 Protection claims: ■! 1. Straight knife cutting machine for flat material ; with a knife guide for the straight knife that extends downward from a machine housing, a hold-down device for the flat material that can be displaced in the vertical direction and has a hold-down device resting on the latter, and with one with its | attached to the lower end of the hold-down device, j together with this displaceable knife guard for the cutting edge of the straight knife ^, characterized in that the length of the knife guard extending along the exposed straight knife cutting edge (26a) (42; 42 ') changeable and its lower end designed in this way is that a short section of the push mass (26; 26 ") over the hold-down device (30; 30") from the side can be viewed directly. 2. Cutting machine according to claim 1, with one along the ram knife from the lower region of the machine housing Lowerable and raised again grinding device for the straight knife cutting edge, characterized in that the knife guard (42) is connected to the grinding device (40). 3. Cutting machine according to claim 2, characterized in that that the upper end of the knife guard (42) is attached to the grinding device (40). 4. Cutting machine according to one or more of the preceding claims, characterized in that the knife - 15 - 7614153 10/20/77 f · ■■ · ■ · · »til ι I H 1 * • I I t> It • «a * ·» t ι ι I I * > ti * • * III *, 1 « •. «1 I · ti A 41 624 b "'"' "" ' b - 163 April 21, 1976 - 15 - Protection from at least one on one side of the push knife (26) arranged and over the cutting edge (2 6a) protruding forward, flexible tape (42) consists. 5. Cutting machine according to claim 4, characterized in that the knife guard consists of two such strips (42) Best'at attached to both sides of the razor knife (26) are. € · Cutting machine according to 7 \ r claim 4 or 5, characterized in, that the band (42) against the side surface of the push knife (26) and / or the knife guide (16,24) is applied or is arranged in the immediate vicinity. 7. Cutting machine according to one or more of the preceding claims, characterized in that the upper The end of the belt (42) is attached to a part (41) which can be displaced with the hold-down device (30). 8. Cutting machine according to claims 2 and 7, characterized in that the grinding device (40) a Deflection device (50,52) for the belt (42) carries. 9. Cutting machine according to one or more of the preceding Claims, characterized in that a winding device (52 ') for the upper part of the tape (42) is provided, in particular on the grinding device (40) or aa \ machine housing (lo). 10. Cutting machine according to claim 9, characterized in that the Band (42) made of spring material, in particular spring steel, and so on is designed that it rolls up automatically under its own tension. -16- 7614153 20.10.77 • · · · · I III Λ 41 624 b ■ b - 163 April 21, 1976 - I ^ - 11. Cutting machine according to one or more of the claims 4 to Io, characterized in that the lower end of the band (42) is hinged to the hold-down device (30) is, the hinge axis (46) parallel to the plane of the belt and perpendicular to its longitudinal direction. 2. Cutting machine according to one or more of the claims 4 to 1 1, characterized in that the band (42) ends at a small distance from the hold-down device (30) above this. 13. Cutting machine according to one or more of claims 1 to 3, characterized in that the knife guard ·. (42 ¹ ) is formed by an element made of wire or strip-shaped material, which is sick-zag-shaped in the side view and can be shortened or lengthened in the longitudinal direction of the push knife. ; l 14. Cutting machine according to claim I3, characterized in that net that the knife guard is designed as a helical spring surrounding the push knife including knife guide. 5. Cutting machine according to one or more of the claims 1 to 3, characterized in that the knife guard is arranged in front of or next to the cutting edge in particular toleskopierbaren rod is formed. 16. Cutting machine according to one or more of the preceding claims, with a bottoming element for lowering the bodice holder as / ie a switch for the push knife drive, characterized in that the switch (3 'is coupled to the operating element (32) in such a way that: switching off the push knife drive causes the hold-down device (30) to be lowered. 7614153 10/20/77