DE3012493A1 - Elastomer sealing strip cut for mitre joint - using two knives moving obliquely into V=shaped space between clamps - Google Patents

Abstract

An apparatus for cutting elastomer sealing strips to a mitre is intended esp. for strips of T or L section. The cutting apparatus comprises two sets of jaws (4a, 4b; 5a; 5b) which clamp the strip firmly. The facing sides of these two jaws define a V-shaped space (10) of the intended mitred angle. Two cutting blades (20) are used, and these descend obliquely towards the base (11) of this V-shaped space. Specifically one flange of the section (A) is longer than the other (B), and it is the longer flange which is to be cut obliquely, the parting planes (6,7) of the sets of jaws are oriented parallel to this longer flange and the direction of the cut (21) is therefore along the flange.

Description

"Device for cutting sealing

Profiles made of elastomeric materials on a miter ".

The invention relates to a device according to the preamble of the claim 1.

Two mirror-symmetrical cut surfaces of this kind on a miter cut sealing profiles are subsequently transformed into so-called frame seals glued. The frame seals are in corresponding complementary grooves of for example Window frames made of wood, plastic or metal and also made of composite materials used and there should be a reliable seal with regard to air currents, but especially with regard to any water penetrating. This sets clean Miter cuts ahead, which should be as flat as possible and their position exactly that Miter angle corresponds.

For the stated purpose, a multitude of are very different from one another Sealing profiles available in stores. These sealing profiles have in view on a A large number of different frame profiles differ greatly from one another different and sometimes very complicated cross-sections. An excellent one The so-called center seals for window frames play a role here. To be sure modern manufacturing techniques such as extrusion processes etc.

There are no limits to the cross-sectional shape of seals, but the possibilities are for the production of miter cuts with the desired geometric properties.

Miter scissors are offered on the market, one of which has a blade in a mirror-symmetrical arrangement an A striking plate with an opening angle of 900 is arranged.

Such a device can be used for complicated profile cross-sections neither create flat cut surfaces, nor those that are at an angle of exactly 450 run to the longitudinal axis of the profile. The reason for this is to be found in the fact that the sealing profile is initially elastically deformed under the pressure of the scissor blades, yes is downright squeezed before the profile material then, starting from a Edge until the other edge is cut. Since the sealing profile does not have any has additional support, individual volume elements become elastic during the cut pulled out of the profile material, others obviously pressed into the same. The end result is corrugated, three-dimensional cut surface that is not undulating runs at the desired angle to the longitudinal axis of the profile.

Thin profile projections such as Tabs, ribs or webs that become elastic under the pressure of the cutting tool Relocate the deformation to a location other than the intended one, so that the Cut is made at a point by #, which is probably the position of the cutting edge, not but corresponds to the position of the respective pool element in the later miter joint.

With such sealing cross-sections, the deviations are from one ideal miter cut nocli much larger.

About the influence of the elastic profile deformation before the cutting process and while counteracting the same, a device of the initially introduced described type on the market. This device has a knife holder in the form of a right-angled, isosceles I> square prism, on one of which Front side two perpendicular to each other cutting edges are arranged.

This knife holder will be parallel to the bottom of the V-shaped space moved, i.e. parallel to the imaginary line of intersection of those standing at right angles to each other End faces of the clamping jaws that limit this space in which the sealing profile is unclamped during the cutting process. Here, the form of the cutting edges Finally, the edges of the clamping jaws reached the so-called counter-cutting edges. It However, it has been shown that even with this known device there is still one sets a relatively strong Al) softening of the cut surfaces from the ideal shape, because the individual profile protrusions are obvious in the selected cutting direction cannot be held very reliably between the jaws. Added to this is obvious also the influence of the relatively large wall thickness of the knife, which in the Chosen cutting direction by the chosen arrangement as well as by the fastening options the knife is conditional. The known device has as a result only for relatively simple profile cross-sections proved to be reliably usable.

The invention is therefore based on the object described at the outset Device to improve in such a way that even on relatively complicated Profile cross-sections Miter cuts can be carried out that result in the most flat cut surfaces possible lead, with the cut surfaces also as precisely as possible at an angle to Profile longitudinal aciise, which is given by the miter angle.

The solution to the given task takes place through the in the indicator of claim 1 specified feature.

The indication that the cutting edges towards the bottom of the V-shaped Space can be moved is synonymous with specifying that the cutting edges are in the direction are movable on the imaginary line of intersection of the end faces of the clamping jaws. With In other words, in the subject matter of the invention, the cutting direction is exactly perpendicular to the cutting direction in the known device. As a result, the cutting edges which are attached to separate drive devices, converge at an angle, which is specified by the miter angle and is 900, for example. It has surprisingly found that the clamping action of the jaws under such Cutting direction, which necessarily runs at an acute angle to the longitudinal axis of the profile, is much more reliable, so that the two cut surfaces are much more flat and are more angular than in the known device. This also and especially applies for complicated profile cross-sections with protrusions in the lobes, webs or ribs. It can be assumed that the mounting of the sealing profile is still by some kind Bridge effect is supported, which is the V-shaped Space before the cutting process spanning sealing profile compared to the invention Cutting direction generated.

In the subject matter of the invention, the parting line of each set of clamping jaws preferably lie in one plane. With complicated sealing profiles that one have a lateral offset, it can, however, also be expedient to remove the 't'rcnnfuge to run in a Z-shape. The indication that the in at least one jaw of each set existing recess is complementary to the sealing profile, says, that the parallel to the parting line internal profiling of the clamping jaws as largely as possible should correspond to the outer profile of the seal. The ideal case would be to strive that the clamping jaws surround the sealing profile on all sides without air inclusions. However, certain deviations from this ideal state are possible without the advantageous one Effect of the subject invention would be abruptly called into question. The one above The bridge effect described is particularly pronounced when the to be cut Sealing profile at the point that is last reached by the cutting edge, a has flat boundary surface, which comes to rest on a base plate, the jaws rest on it. In this case the recesses are in the jaws downwards, i.e. opposite the base plate, open so that the sealing profile in the V-shaped space rests on a fixed abutment, whereby the balance of power be influenced advantageously during the cutting process.

With complicated sealing profiles it is also and with special Advantage possible, the individual jaw sets from more than two jaws form to an internal machining of the clamping jaws and / or # the introduction of the sealing profiles to lighten.

With regard to the inevitably occurring during the cutting process It is particularly advantageous for waste pieces to make the V-shaped space as narrow as possible. The width of the bottom of this room is only given here to dimension the finite cutting edge dimensions.

The device according to the invention is particularly suitable for use of sealing profiles, one leg "A" of which is longer than the other leg "B", with the longer axis "a-a" of the cut profile cross-section under a at an acute angle corresponding to the miter angle to the longitudinal axis of the profile. In such a case, the parting lines of the jaw sets according to the further l.rfindung parallel to the longer axis "a-a" and the direction of movement the cutting edges aligned parallel to the parting lines. This measure is also available in contrast to the prior art, since in the known device the cutting direction runs perpendicular to the parting lines. In the solution according to the invention runs the cutting direction in the direction of the longer axis "a-a", i.e.

in a direction in which the sealing profile the cutting forces the can oppose greater section modulus.

The specification that the profile cross-section should have a T or L shape is to be understood only approximately. In reality are those on the market Profiles made much more complicated, as shown in the following graphic Representations emerges. However, it can be seen that the possible cross-sectional shapes largely correspond to a "T" or "L 1 '. For simplicity, the crossbar of the "T" also referred to as the leg.

I) the subject of the invention enables a particularly advantageous training the cutting, in which these are parts of (commercially available) flat blades are, which are on both sides at the ends of two legs of a U-shaped blade holder are attached. Such blades have a thickness of the order of one Millimeters, so that the profile material does not have any significant additional forces opposed to the pure cutting forces and the unavoidable frictional forces go out. The frictional forces can be reduced by the addition of special lubricants or further reduced by appropriate surface treatment of the blades will. It is essential that such flat blades do not have a large impact on the material Exercise displacement effect. Nevertheless, the blades are on the U-shaped leg holder fastened reliably stretched out, a measure that for spatial reasons when State of the art cannot be achieved.

The exact interaction of the clamping jaws and cutting is still to be achieved thereby further favored when, according to the further invention, the end faces of the Clamping bars outside the end faces, which form the recesses for the sealing profile surrounded, are provided with stepped recesses that. to accommodate the legs serve the blade holder.

The cutting effect can also be particularly advantageously thereby be promoted that the device is assigned an additional drive through which Oscillation movements can be superimposed on the cutting edges in the longitudinal direction of the cutting edges are. Such a measure is particularly advantageous when the cutting edges are provided with a sawtooth or serrated edge.

Further advantageous refinements of the subject matter of the invention go from the remaining subclaims.

One embodiment of the subject matter of the invention and two with it Processable sealing profiles is described in more detail below with reference to FIGS. 1-4.

1 shows a perspective illustration of the essentials Device parts of the subject matter of the invention with inserted sealing profile Carrying out a cutting process, FIG. 2 shows a cross section through a sealing profile in L-shape, FIG. 3 in a schematic representation a partially sectioned front view a complete device including drive means and FIG. 4 a partial sectional plan view of the object according to FIG. 3.

Fig. 1 shows a base plate 1 with a front 2 and a Back to which a stop 3 is attached. On the base plate 1 there are two Clamping jaw sets 4 and 5 are arranged, each consisting of two clamping jaws 4a and 4b or 5a and 5b exist, the outer shape of which partly corresponds to that of cuboids.

The clamping jaws include between them parting lines 6 and 7, the run perpendicular to the base plate 2. Each on the same side of the parting line lying jaws cursed each other. The jaw sets 4 and 5 have end faces 8a and 8b or 9a and 9b, the end faces being the same Numbering each lie in a common level. Between these end faces or levels, a V-shaped space 10 is formed, which is open at the top and a base 11 forms downward. The base 11 is through the surface of the base plate 1 and has a finite width, since at this point at the end of the cutting process the cutting edges described in more detail below must find space. From this it follows that the planes in which the end faces 8a and 8b or 9a and 9b lie in an imaginary line below the surface of the base plate I and cut parallel to this. The opening angle of the V-shaped space 10 corresponds the miter angle and in the present case is 900 The clamping jaws are with one recess each that is complementary to the sealing profile and parallel to the parting line provided for receiving a sealing profile 12, whose in the end face 9a or 9b lying cut surface is shown cross-hatched.

It can be seen that the bisecting plane to the longitudinal axis of the Profile 12 runs vertically. The clamping jaws 5a and 5b and analogously also the clamping jaws 4a and 4b are in the direction of arrows 13 and 14, i.e. perpendicular to the parting lines 6 and 7 braced against each other, which is expedient by shifting the clamping jaw 5a in the direction of the stop 3 happens. The resources required for this are shown in fig.

The clamping jaws are outside of the recess for the sealing profile surrounding end faces provided with step-shaped recesses 15, which to the base plate 1 have the same angular position as the end faces. The jaw set 5 (and in an analogous manner also the clamping jaw set 4) is provided with a blade holder 16 associated with a U-shaped lower portion, which is through a recess 17 and two parallel legs 18 are formed with a rectangular cross-section. The width the recess 17 corresponds to the width of that part of the clamping jaws 5a and Sb, which lies between the recesses 15, so that the legs 18 on both sides the end faces 9a and 9b of the clamping jaws can be moved past. The lower ends the legs 18 are illitated by a flat blade 19 pointing downwards Cutting edge 20 connected, which bridges the recess 17. The arrangement is there taken so that the cutting edge 20 when the blade holder 16 moves along the two dashed lines immediately in front of the end faces 9a and 9b and moved along parallel to these until the cutting edge 20 hits the base 11 of the V-shaped space 10 meets. In this case.

Movement in the direction of arrow 21 is the cross-hatched in Figure 1 Cut surface 22 of the sealing profile 12 crgenerates.

It can be seen that in the present case, the parts of the clamping jaws Sa and 5b, which lie between the sealing profile 12 and the base plate 1, are omitted can be, since in this case the almost flat lower surface of the sealing profile can support on the base plate 1.

It can be seen that in the present case the leg A of the sealing profile 12 is longer than leg B. The Leg A is finished Frame seal the one that runs parallel to the main plane of the frame. The sealing profile 12 shown has a laterally obliquely protruding tab 23, which is special with regard to the required flat shape of the cut surface 22 Raises problems, but which are solved by the subject matter of the invention. The thigh A in this case has a longer axis a-a, denoted by the dashed line within the cut surface 22 is indicated. This axis runs at an angle of 450 to the profile longitudinal axis, while the other, unspecified, shorter axis of the leg B at a right angle to the axis a-a and thus to the longitudinal axis of the profile runs. It can be seen in Figure 1 that the longer axis a-a in the parting line 7 runs and that the direction of movement (arrow 21) of the cutting edge 20 is parallel to the parting line 7 extends.

In Fig.2 is a vertical cross section through another sealing profile 12a shown, which is L-shaped.

The longer leg A serves as the actual sealing lip, while the shorter legs B for insertion into a complementary recess in a frame serves. Legs A and B also have analogous functions in the sealing profile according to FIG Fig. 1.

In Fig. 3, the same parts as in Fig. 1 are given the same reference numerals Mistake. It can be seen that a stop 3 is formed on the base plate 1 Rear wall 24 is arranged in a mirror-symmetrical arrangement to the V-shaped Space 10 carries two pressure medium drives 25 and 26. Their piston rods 27 and 28 form an angle of 900 between them corresponding to the miter angle. The piston rods are fastened in clamping bodies 29 and 30, in which the blade holder 16 are clamped. In order to ensure precise guidance of the gen 19 before To reach the end faces of the clamping jaws, the blade holders 16 are in guide bodies 31 and 32, which are also fastened to the rear wall 24. For the purpose a tolerance compensation are the pressure medium drives 25 and 26 between bearing blocks 33, which are attached to the rear wall 24, pivotably mounted about axes 34 and 35, which run perpendicular to the piston rods 27 and 28.

Fig. 4 can also be seen that the base plate 1 on your Front 2 is provided with a vertical flange plate 36, which is shown in FIG has been removed for better insight into the device. On the flange plate 36 is a pressure plate by means of a drive 37 and horizontal parallel guides 38 39 movably arranged, between which and the stop 3, the jaw sets 4 and 5 are located. In the pressure plate 39 are for the purpose of a retraction of the pressure plate 39 tie rods 40 attached, which penetrate the flange plate 36 and get through Support compression springs against this in such a way that the drive 37 is relieved of pressure is withdrawn.

A sealing profile 12 or 12a with the drive 37 relieved by pushing it between the clamping jaws 4a and 4a 4b or 5a and 5b and bring it into the desired longitudinal position so that the cut off Sealing profile has exactly the prescribed length. By applying the Drive 37, the jaw sets 4 and 5 are pressed together and the sealing profile 12 and 12a held reliably. Then it can be described in more detail in FIG Cutting process cut an approximately V-shaped part from the sealing profile which is to be regarded as waste. At the end of -Working strokes take tlie blade holder 16 and with them the flat blades 19 that shown in FIG Position.

The mirror-symmetrical cut surfaces 22 of the individual profile sections can then be glued together so that the longitudinal axes of the individual Profile sections run at an angle of 900 to each other. The (, honor fugue is tightly closed here.

It should be added that the guide bodies 31 and 32 directly are arranged above the jaw sets 4 and 5 and consequently also as Serve horizontal guidance for the individual clamping jaws (Fig. 3). An exact guide and adjustment of the individual clamping jaws is also achieved by that this with the stop 3 or the rear wall 24 on the one hand and with the pressure plate 39 on the other hand are screwed.

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Claims (9)

A N S P R Ü C H E: 1. Device for cutting sealing profiles made of elastomeric materials on a miter, in particular for the positioning of frame seals, whose profile is essentially T- or L-shaped with one leg A and one leg B is designed with two sets of jaws, each made up of at least two relative There are mutually movable jaws that eill close parting lines between them and of which at least one each with a complementary to the sealing profile and is provided parallel to the 'l'rennfugc recess, the jaws of both Sentences are in line with each other and flat faces are shown between them enclose a V-shaped space with an opening angle corresponding to the miter angle, the bisector of which is perpendicular to the longitudinal axis of the profile, as well as two Cut the one, one of which is immediately in front of the faces of the associated Clamping jaw set and can be passed parallel to these end faces, thereby characterized in that the cutting edges (20) in the direction of the (rulld (11) of the V-shaped Space (10) are movable. 2. Device according to claim 1 for use for sealing profiles, one leg "A" of which is longer than the other leg "B", the longer being Axis "a-a" of the cut profile cross-section at an acute angle accordingly the miter angle to the profile longitudinal axis, characterized in that the Parting lines (6,7) of the jaw sets (4,5) run parallel to the longer axis "a-a" and that the direction of movement (arrow 21) of the cutting edges (20) is parallel to the parting lines extends. 3. Apparatus according to claim 1, characterized in that the cutting edges (20) Parts of flat blades (19) are attached on both sides at the ends of two legs (18) of a U-shaped blade holder (16) are attached. 4. Apparatus according to claim 3, characterized in that the end faces the clamping jaws (4a, 4b, 5a, 5b) outside the end faces (8a, 8b, 9a, 9b) which the Surrounding recesses for the sealing profile '(12,12a), with step-shaped recesses (15) are stranded to accommodate the legs (18) of the blade holder (16) to serve. 5. Apparatus according to claim 1, characterized in that the jaw sets (4,5) are arranged on a horizontal base plate (1) with a stop (3) and that the respective front clamping jaws (4a, Sa) parallel to the base plate against the rear clamping jaws (4b, Sb) and against the stop (3) can be clamped. 6. Apparatus according to claim 5, characterized in that the base plate (1) is provided with a vertical flange plate (36) on its front side (2), at by means of a drive (37) and horizontal parallel guides (38) a pressure plate (39) is movably all-arranged, between which and the stop (3) the jaw sets (4,5) are located. 7. Device according to claims 3 and 5, characterized by gckex, that a rear wall (24) forming the stop (3) is arranged on the base plate (1) is that in a mirror-symmetrical arrangement to the V-shaped llau (10) two pressure medium drives (25,26) carries the piston rods (27,28) - an angle corresponding to the miter angle include between them that the blade holder (16) attached to the piston rods and in guide bodies (31,32) are mounted, the same if on the rear wall are attached. 8. Apparatus according to claim 7, characterized gekennzeichllet that the pressure medium drives (25,26) are pivotally attached to the rear wall (24). 9. The device according to claim 1, characterized by an additional drive, by which the cutting edges (20) oscillate movements in the longitudinal direction of the cutting edges are superimposable.