DE3004922A1 - Cutter for soft rubber profiles - with correspondingly profiled pairs of jaws which hold material without deformation during cutter movement - Google Patents

Abstract

Lenghts of profiled rubber or similar materials are cut up using a machine with a profiled jaw to fit part of the material section, a second profiled jaw to fit the remaining cross-section, a device to move the jaws to/from each other, and a cutter which moves relative to at least one jaw. A continuous profile of rubber is placed with one end on the jaws which fit the profile of the underside and therefore hold it firmly. An arm is moved and the upper jaws engage the top face of the material without deforming it. By moving the arm the knives cut smoothly through the material at two places, the knives being set at whatever angle is desired. Method gives smooth cuts through soft elastic materials and at any angle to their axis.

Description

The invention concerns a device according to

Preamble of claim 1.

When edging and sealing doors, windows and the like Rubber profile pieces are often used, for example at their ends in a 45 ° corner joint need to be put together. These rubber profile pieces are made of an endless belt cut off and should have a clean cut surface, so that an exact connection the ends is possible. Because of the deformability of rubber or similar materials however, it is very difficult to make smooth cuts like the simple one The experiment shows using scissors to cut through a slightly thicker piece of rubber. It is in connection with the recently renewed energy-saving measures however, it is essential to make smooth cuts, otherwise there is no effective thermal insulation is possible.

There are already several devices for cutting off strand-like plastic material known that an automatic feed with clamping device own (cf. DE-AS 17 79 538, DE-PS 21 02 618, DE-GM 19 30 538, DE-OSen 19 61 564, 20 13 282, 23 18 388, 27 24 859). However, as tests have shown, with the known devices no exactly smooth cuts can be realized.

The invention is therefore based on the object of a device to create, with which it is possible to make smooth cuts of any cross-section to be carried out with soft elastic or plastic material.

This object is achieved according to the features of claim 1.

The advantage achieved with the invention consists in particular in that the cut surfaces of the severed strands are very smooth, no matter in which angle or at which angles relative to the longitudinal axis of the strand the cuts be performed.

An embodiment of the invention is shown in the drawing and is described in more detail below. They show: FIG. 1 a front view of a hand-operated machine for cutting endless rubber profiles; Fig. 2 is a side view the machine shown in Figure 1; 3 is an enlarged front view of the upper part of the machine shown in Figure 1; 4 is a side view of the upper part of the machine shown in Figure 1, opposite the view of Figure 2 rotated 180 degrees; Fig. 5 is a rear view of the upper part of the in the Fig.1 shown machine; 6 is a front view of the lower half of the in the Figure 3 illustrated device with an additional device; Fig. 7 is a top view on the device of Fig.6.

In the Fig.1 is a hand-operated machine 1 for cutting endless Shown rubber strands which have a profile in cross section. This machine 1 contains a support frame, which consists of two vertical rectangular pillars 2, 3 and three rectangular cross struts 4,5,6, of which the last-mentioned strut 6 is partially covered. At the lower cross strut 4, two longitudinal members 7, 8 are provided on which feet 9, 10, 11 are welded on. Above and parallel to the longitudinal members 7, 8 are two more Rectangular carrier 12,13 is provided, which is the actual cutting device of Carry machine 1. This cutting device has a lower plate 14 and a top plate 15, the top plate 15 in turn having two blocks 16,17 with a profile bake 18.19 owns. Above these blocks 16,17 and profile bake 18,19 are on another plate 20, which is fixed by two round and in the blocks 16,17 Rods 21.22 is guided, two more blocks 23.24 attached, which profile bake 25.26 are assigned. Knives 27,28 can slide past this profile 25,26, which are attached to a plate 29. This plate 29 is in turn with a Support 30 connected, which is attached to a sliding part 31, which on guide rods 32,33 can slide along, which via a frame 34 with the rectangular pillars 2,3 of the machine 1 are connected.

The displacement of the elements 27,28,29,30,31 relative to the elements 14,15,16,17,18,19 takes place in such a way that a lever 35, which via a shaft 36 is connected to a toothed drive, which cannot be seen here, from the plane of the drawing is moved out forward. As a result, the sliding part 31 moves down and takes the knives 27,28 with it. If the lever 35 is released, press Springs 37,38, which are placed around bolts 39,40, which in turn are fixed to the plate 20 are connected and protrude through holes in the plate 29, the plate 29 again up. When cutting an endless profile rubber by hand, the way proceeded that one end of the rubber bake with a profile side on the profile 18 arrives and then on the profile jaw 19 is pushed. As the profile of the profile bake 18,19 corresponds to the profile of the rubber facing them, this rubber sits relatively tight on the profile jaws. Now the lever 34 is actuated, whereby the profile bake 25,26, which are designed so that they exactly the top of the rubber profile include, clamp the profile rubber between itself and the profile jaws 18,19. The profile rubber is practically not deformed here, as it is to a certain extent as in is embedded in its own mold. If the lever 34 is now moved further, the knives 27, 28 cut the rubber profile smoothly in two places.

In the example of Figure 1, two knives 27, 28 are visible, 0 in a 45 ° angle to the plates 20,29 are arranged. Behind these two knives are located However, there are two more knives that are not visible and with their side faces stand vertically or almost vertically on the side surfaces of the knives 27, 28. The total of four knives form an X, so to speak. Of course you can if necessary, only one knife can be used or any number can be used Knife be provided. Likewise, the angles between Bake the knives or profile and insist on an imaginary horizontal line.

The same machine 1 as shown in FIG. 1 is shown in FIG is shown again, namely in a view from the side. One recognizes here, the rectangular carrier 13 on which two plates 14,41 are arranged, which in turn carry the plate 15 on which the block 17 is located. This block 17 wearing the rod 22 which is inserted through the block 24 and the plate 20. The knife 28 and a knife 42 can also be seen, both knives 28, 42 being perpendicular or are almost perpendicular to each other.

In front of these knives is the spring 38, which is around the bolt 40 is laid. The plate 29 and the knives 28,42 are connected to the carrier 30, which is attached to the sliding part. The lever 35 is via the shaft 36 with connected to a rearward protruding part of the frame 34. On this} elle 36 there is a gear 43, which is carried along by the movement of the lever 35 will. Behind the Pvechteck pillar 3 is a rack not visible in FIG arranged, which is moved by the gear 43 and thereby the sliding part 31 as well as the carrier 30, the plate 29 and the knives 28,42.

With the help of a sliding rod 44, which with a screw 45 on Frame 34 can be locked, the position of the sliding plate 31 relative to the frame 34 can be changed.

3 shows the actual cutting part of the machine 1, such as it was shown in Fig.1, on an enlarged scale. One recognizes here, that the knife 27,28 via a cylinder part 46, which is in a rectangular structure 47 opens, are connected to each other. Furthermore, a pipe clamp 48 is shown, which is slipped over the cylinder 46 and tightened by means of a screw 49. the The pipe clamp 48 and the carrier 30 form a unit.

Another plate is attached to the lower plate 14 via bolts 50, 51 52 attached, which has a guide pin 53, which is to be described later Before- direction leads. There are a total of four bolts and on the plate two guide pins are provided, of which, however, only two bolts and one guide pin can be seen in the drawing. The rectangular Träaer 12,13 are about screws 54,55 connected to the plate 14.

The profile jaws 18,19 are designed on their surface so that a rubber profile or the like can be pulled over them. The lower profile the rubber then corresponds to the profile of the profile jaws 18,19, so that the rubber an exact guidance is given by the profile jaws 18,19. If the profile rubber is everywhere has the same thickness, then the profiles correspond to the upper profile jaws 25,26 the profiles of the lower profile jaws 18, 19, i.e. they can be slipped over them exactly will. In the case of locally different thicknesses of the rubber profile, the profiles are the upper profile bake 25,26 adapted to the top of the rubber profile.

The knives 27,28 and the profile jaws 18,19,25,26 run obliquely towards the inside, i.e. the cutting edges 56,57 of the knives 27,28 are further inside in the plane of the drawing as the outer edges 58.59. As on the back, not shown the cutting device at the top and bottom with two additional knives or profile jaws are provided, form the total of four lower and the total of four upper Knife or profile jaws two superimposed X-shaped structures.

The round bars 21, 22 are usually provided with return springs, which, however, have been omitted from the figure. These return springs cause the blocks 23,24 can be lifted slightly upwards in order to push the rubber strand further. Only a relatively small stroke is required for this. But it should once jam a rubber strand, so the upper blocks 23.24 can also continue from the lower blocks to be removed to make room for mechanical intervention.

In FIG. 4, the device of FIG. 3 is essentially shown again shown, from the side.

One recognizes here the knife 60, which is shown in the previous figures could not be seen. In addition, you can see a guide rod 61 which passes through the plate 52 (FIG. 3) is inserted and has a spring 63 above this plate 52.

This guide rod 61, which is not identical to the rod 21, carries an invisible counter pressure plate, which will be discussed in more detail later. With the profile jaws 18.25 you can clearly see the upper and lower profile of the to be cut endless rubber strand 70, which you look into the plane of the drawing must introduce extended. If the profile bake 18.25 approached each other, so they enclose the rubber strand 70 on both sides.

In Figure 5, the upper part of the machine 1 is shown from behind. In front of the guide rods 32, 33, which guide the sliding part 31, there are springs 62, 63 arranged with one end to the frame 34 and with its other end are attached to the sliding part 31.

A toothed rack 64 is located between the guide rods 33, 32, which is in engagement with the gear 43.

In Fig.6 is essentially the lower half of the Fig.3 shown device again shown in more detail. The guide rod 53 is, however only indicates because he has the point of view of another senior staff 65 would cover, which is inserted through the plate 52 and the one with a spring 66 is surrounded.

This guide rod 65 carries a counter pressure plate 67, which on the one hand is adapted to the profile jaws 18,19 that it complements them to form a rectangle, and slide along the other hand in the vertical direction of this profile bake 18,19 can. If it is pressed down by the knives 27, 28 against the force of the spring 66, after the pressure has stopped, the spring pushes it upwards again.

The counter pressure plate 67 is a very important component because it prevents the underside of the profile strand from slipping when cutting the rubber can result in non-smooth cuts. With the counter pressure plate 67 can the quality of the cuts, which were already very good, was noticeably improved will.

In FIG. 6, the counter pressure plate 67 is included for the sake of simplicity shown on a smooth surface.

In an advantageous embodiment of the invention, however, it has the same profile as the profile bake 18,19.

This can be seen from Figure 7, where the counter pressure plate 67 in the Top view is shown and provided with grooves that match the grooves of the Profile jaws 18,19 correspond. The counter pressure plate 67 has two bores, through which the guide pins 53,68 are inserted. On the device of Fig.7 two strands of profile rubber can be laid, one above the point 65 and one below this point 65.

When pressing down the knife 27,28 acts on the plate 20 Force of springs 37.38. Opposite this force is the force not shown and springs wrapped around the guide rods 21.22.

If both spring forces are equal, only the knives 27, 28 move downwards, but not the plate 20 (see FIG. 3). However, is the power of Springs, not shown, are somewhat less than the force of springs 37,38 also the plate 20 moved down, whereby the profile bake 25,26 the profile jaws 18:19 can be approximated. This profile jaws 18,19 25,27 can be made of metal and have obtained their profile with the help of the spark erosion process, they can, however, also consist of molded plastic under certain circumstances.

That part of the guide rod 65 located below the plate 52 (Fig. 6) can be provided with a thread through which a nut can be screwed. This makes it possible to determine the position of the counter pressure plate 67 relative to the profile bake 18.19 to be set exactly.

The present invention has been made using a manually operated Machine 1 described. It goes without saying, however, that all essential processes can also be carried out automatically and using motorized drives can. Some examples of how endless strands are transported and can be cut off are described in the prior art cited above.

It proves to be particularly advantageous to use both the endless strand to press on the profile from one side as well as from the other side to pull away from the profile jaws. You can do two on top of each other arranged rollers are provided which clamp the strand to be transported.

In a particularly advantageous manner, the circumferences of these rollers have a profile that matches the profile of the strand.

Between the vertical movement of the cutting device and / or the upper profile bake on the one hand and the horizontal movement of the strand on the other hand, a synchronization is expediently provided.

This synchronization can be implemented by means of a control device which is controlled by sensors and / or limit switches, which the Determine the end positions of the cutting device and / or the strand. To this Way, the control device can after completion of the one step the next Initiate step or the next following steps.

Due to a program control it is also possible with the help of n knives and profile bake m strands simultaneously and / or in a specified manner Order one after the other and cut off automatically. The actual control function can be done by a microprocessor that is programmed to become a certain predeterminable time one or more cuts with one or more Profile cross-sections on endless strands. The size of the cut pieces can also vary by causing program control to run the thread once more and once less horizontally displaced by a motorized drive will.

By using controllable servo motors, the distance the knife and / or the profile jaws can be changed.

Bake with regard to the spatial arrangement of the profile can the invention can of course also be modified. This is the case with Use of the mentioned transport rollers for the rubber strand expediently, the guide rods 21,22 (Fig. 7) not to be placed between the profiles, but to be moved upwards, so that where in Figure 7 the guide rods 21,22 can be seen, space for the Transport rollers is created. These transport rollers can be stacked on top of each other or be arranged side by side.

Claims (20)

DEVICE FOR CUTTING LONG ROPES FROM RUBBER OR SIMILAR: t MATERIAL Patent claims 1. Device for cutting long strands of rubber or similar material into smaller pieces, with these strands on their surfaces are at least partially provided with a non-planar profile, n identifies by a) a first profile jaw (e.g. 19), which is part of a strand surface includes and which is designed so that they exactly to the part of it encompassed Strand surface is adapted; b) a second profile jaw (e.g. 26) that holds the remaining second part of the strand surface and which is formed so that they exactly is adapted to the part of the strand surface which it encompasses; c) a device, with which the profile jaws (19, 26) are moved towards and away from each other can and with which it is possible to positively clamp a strand; d) a cutting device (27,28) which bake relative to at least one of the profiles (19.26) is movable and one clamped between the profile (19.26) Strand cuts. 2. Apparatus according to claim 1, characterized in that a counter pressure plate (67) is provided, which by the cutting device (27,28) against a Biasing force is movable. 3. Apparatus according to claim 2, characterized in that the counter pressure plate (67) is adjustable relative to the profile jaws. 4. Apparatus according to claim 2, characterized in that the counter pressure plate (67) is provided with a profile that corresponds to the profile of a profile jaw (e.g. 19). 5. Apparatus according to claim 1, characterized in that two a first level arranged profile jaws (18,19) are provided, which two bake arranged on a second level profile (25,26) face. 6. Device according to claims 1, 2 and 5, characterized in that that the counter pressure plate (67) between two profile arranged on one plane bake (18,19) is provided. 7. Apparatus according to claim 5, characterized in that the two Profile jaws (18,19; 25,26) arranged on a plane have a V-shape, the Tips of the V's are directed towards each other and the legs of each V with profiles are provided. 8. Apparatus according to claim 1, characterized in that the cutting device (27,28) moves against the force of springs (34,38) when cutting a strand will. 9. Device according to claims 1 and 7, characterized in that that the cutting device consists of at least one knife (e.g. 28) attached to at least one profile jaw (e.g. 26) can be guided past. 10. The device according to claim 2, characterized in that the counter pressure plate (67) is provided with through-holes through which guide pins (53,68) can be pushed are. 11. The device according to claim 2, characterized in that the counter pressure plate (67) has a Führunosstab (65) through the bore of a plate (52) or the like is pushed, this guide rod (65) surrounded by a spring (66) is. 12. The device according to claim 1, characterized in that a frame (2,3,4,5,12,13) is provided which carries a frame (34) through which a shaft (36) is pushed, which both with a lever (35) and with a gear (43) is connected, this gear (43) engages in a rack (64), which in turn is connected to a sliding plate (31) on which the cutting device (27,28) is arranged. 13. The apparatus according to claim 12, characterized in that the Sliding plate (31) is guided by guide rods (32,33) and via springs (62.63) (62,63) is connected to the frame (34) which holds the guide rods (32,33) carries. 14. The device according to claim 1, characterized in that the cutting device (27,28) automatically by means of an electric, hydraulic or other drive is moved in a controlled manner. 15. The device according to claim 1, characterized in that the device, with which the profile jaws (19, 26) are moved towards and away from each other can be controlled automatically. 16. The device according to claim 1, characterized in that the strands automatically bake over the profile of the profile using a pulling device (19,26) to be pulled 17. The device according to claim i, characterized in that the Bake strands automatically using a pressure device over the profile of the profile (19,26) must be pressed. 18. Device according to claims 1,14,15,16 and 17, characterized in that that on the left side (Fig. 1) in the immediate vicinity of the profile jaws (18,25) a first roller device is provided, the two superposed rollers has, which over their circumferences the strand or strands in the direction of the Bake profile (18,25) transport, and that on the right side (Fig.1) in the immediate Near the profile bake (19,26) a second roller device is provided which two rolls lying one above the other, which over their circumferences the strand or Bake the strands away from the profile (19,26). 19. Device according to one or more of the preceding claims, characterized in that a control device is provided which the horizontal Transport of a strand over the profile jaws and the vertical movement of the cutting device Coupled with one another in such a way that pieces of string of predetermined Length to be cut off. 20. The device according to claim 19, characterized in that the Control device the horizontal movement of a strand by applying appropriate pressure of a motor, the transport path of which is adjustable, that the control device after moving the strand by a specified path, the one coupled with a motor Cutting device operated so that the strand is cut and that the Control device after the end of the cutting process another horizontal movement of the strand causes.