EP0090933A2 - Apparatus and method for perforating or perforating and cutting tubes - Google Patents

Abstract

1. A method of perforating or of perforating and cutting the walls of hollow bodies made of plastic, said bodies being capable of running true or of presenting rotational symmetry, in particular reels such as textile tubes, characterized in that the hollow body (2) to be perforated is rotated and the points where it is to be perforated are repeatedly punctured by a plurality of needles (8) and the puncture action is repeated in succession at a frequency and with a rapidity such that the tips of the needles (8) in each case repeatedly entering holes being formed heat themselves by friction and make perforations from initially small holes.

Description

The invention relates to a method for perforating and / or cutting concentric or rotationally symmetrical hollow body on the wall, in particular of winding carriers such. B. textile sleeves preferably made of plastic. It also relates to a device, in particular for performing the method.

From DE-PS 25 06 512 a rotationally symmetrical textile sleeve made of thermoplastic material is known, which is deformable in the radial and also in the axial direction. The textile winding can be subjected to a wet and / or heat treatment, perforations being provided in the wall of the textile sleeve for the permeability of the liquor.

In addition, there are numerous cases in which pipe sections have to be cut from an initially longer blank. This applies e.g. B. for cardboard tubes, wallpaper wraps, etc. It is also advantageous if such sleeves can be blown during their manufacture, a continuous manufacture of tubes or an intermittent manufacture of blown hollow bodies is known, in which case the bottom and the endpiece for the blown air must be cut off subsequently.

The primary object of the invention is to provide a method with which sleeves can be perforated quickly and economically in a simple manner and / or, if necessary, cut to their correct length.

To solve this problem, a method for perforating the type mentioned above is characterized above all by repeatedly stabbing at the points of the workpiece to be perforated with one or more needles, stamps, pins or the like, and in that the punctures are carried out as often and so can be repeated quickly in succession that the needle tips or the like, which plunge into the perforations several times, heat themselves due to friction.

When perforating foils, it is already known to use heated needles. However, expensive heating devices are required, which also require their own energy supply. In contrast, the invention makes use of the frictional heat generated during piercing and repeated dipping into a perforation in order to make an initially small perforation into a perforation.

It is particularly expedient if the hollow body to be perforated has been rotated during the perforation and if at least one rotating body, which is also equipped with needles or the like and is also rotated, is set in counter-rotation, the circumferential circle running through the needle tips or the like into the surface of the immersed body to be perforated and the speed is selected so that the needle tips or the like repeatedly immersed in the same places are heated by friction. This results in a kind of toothing between the hollow body to be perforated and the first piercing rotating body with the needles. In this way it can be very easily achieved that needle tips repeatedly hit holes in the course of several revolutions. Too little or too much heating can be avoided by the mentioned speed selection.

The rotating body to be perforated can be rotated or the like by the rotation of the needle carrier or carriers and the temporary positive locking of the needles piercing it. It is therefore sufficient if only at least one of the needle carriers is provided with a drive.

The self-heating needles or the like can be blown to adjust their temperature and / or treated preparatively, in particular wetted with a coolant. The liquid coolant can be applied, in particular brushed, by atomizing or as dripping oil.

An embodiment of the invention of its own worthy of protection can consist in rotating a continuously or intermittently blown hollow body and cutting it off at its later end faces, preferably simultaneously with or after a perforation process. In this way, sleeves of a predetermined length can be cut off from the respective blank, which can either be a longer tube or a bottle-shaped part. It is particularly advantageous if the rotation of this blank is used both for the above-described perforation process and for cutting off. In the same way, however, sleeves of a predetermined length can also be produced that do not receive any perforation. Their rotation could nevertheless take place with the aid of a needle wheel or the like, the needles not then through the entire surface of the body have to step through.

The invention is also based on the object of creating a device for perforating and / or cutting rotationally symmetrical, preferably sleeve-shaped hollow bodies, in particular made of plastic, which is as practical as possible.

A device suitable for solving this task can be characterized in that it has a holder for the workpiece and at least one support body filled with perforation needles, punches, pins or the like, and that drive means for repeated piercing of the needles or the like. are provided in the surface or wall of the hollow body. As a holder for the workpiece, there can be provided on the outer periphery, rotating support rollers, and the needle carrier (s) can be a rotating body, the periphery of which is occupied by needles or the like, and the axis of rotation of which runs parallel to those of the supporting rollers and the hollow body to be perforated . In particular, the needle rollers can be pivoted relative to the workpiece so that they can also be disengaged when the workpiece is finished, at the same time making it easier to insert a new workpiece. It should be mentioned that the needles or the like. Stitching tools can also be profiled depending on the desired shape of the perforation.

Further designs with regard to the support rollers and their adaptability to workpieces of different diameters and the needle carrier are the subject of further claims.

An embodiment of the device according to the invention from Its own worthy of protection may consist in that at least one knife blade or the like. Cutting tool for severing a sleeve or the like with a predetermined length from a blank is arranged in at least one space between the support rollers arranged on the circumference for the rotating workpiece. Such a cutting device can be arranged either in addition to perforating needles or the like, or also in a device without such perforating devices if the device is only intended for the production of sleeves of a predetermined length.

For the separation of individual sleeves from pipes or the like blanks, a plurality of knives or the like which are arranged at a distance from one another can also be provided and rings or the like which are fitted with needles and which are arranged at a distance from one another can be provided. preferably be provided for the rotary drive of the workpieces. In this case, these needle rings can drive the workpieces in the manner of a gearwheel, whereby the function of these needle carriers can already be fulfilled, or the needles penetrate so deeply that a perforation occurs at the same time.

In particular for larger workpieces, a plurality of needle rings and / or needle rollers can be provided for the rotary drive and / or perforation.

However, it is also possible for at least one of the support rollers to be connected to a drive. This can either support or replace a rotary drive emanating from needle rollers, which is particularly expedient if the device is primarily intended for separating sleeves.

Another embodiment of the device according to the invention device of its own worthy of protection may consist in that, in addition to the needle roller or the like. Perforating device, preferably a channel for blowing air with openings directed against the needles or the like and / or for the supply of a cooling liquid are provided axially parallel to the latter. As a result, in addition to the temperature control by a certain speed, overheating of the needles with the aid of a cooling medium can be avoided. In particular, for applying a liquid coolant to the needles or the like, at least one brush or the like which engages with its bristles at least in the area of the needle tips or the like can be provided.

Further refinements of the invention, in particular with regard to an ejector, which can lift the finished workpiece out of the area of the support rollers, are the subject of further claims, as are further refinements with respect to the cutting knife.

For perforating and / or separating workpieces with a profiled surface, the support rollers can have an analog counter-profile. In particular, the textile sleeves according to DE-PS 25 06 512 should above all be able to have a wavy surface in order to allow their surface to be flexible in the radial and also in the axial direction. When perforating such a sleeve, it is expedient if the aforementioned measure is taken, namely that support rollers with counter-profiles are used. In this case, the support rollers for workpieces having ring-shaped profiles can have zones with groups of stronger counter-profiles and those with weaker counter-profiles. This allows such a profiled sleeve to adapt to the profiling of the support rollers even with small dimensional deviations, since above all the weaker ones trained counter-profiles do not fully engage in the sleeve profile and thus give it some freedom of movement in the axial and / or radial direction.

It has already been mentioned that the needle rollers or wheels can be arranged with their axes parallel to a workpiece to be perforated. In a modified embodiment of the invention, which in turn has its own worthy of protection, it is possible that for perforating hollow bodies, preferably hollow bodies emerging directly from an extrusion device or the like, at least one needle wheel or the like, preferably several at an angle to one another arranged needle wheels are provided, the axis of rotation of which are arranged transversely, preferably at right angles to the feed direction of the workpiece. In addition to these pinwheels, pinwheels running parallel to the workpiece axis can also be provided. In particular, their axes, which are somewhat oblique to the feed and to the workpiece axis, can possibly also produce helical perforations.

A modified device, in particular for carrying out the method described at the outset, can consist in that fixed, in particular in one plane, needle fields are provided for perforating preferably rotationally symmetrical bodies, by means of which the bodies to be perforated can be unrolled. As a result, even with sufficient rolling speed, the needle tips or the like can repeatedly enter and heat up in the initially small perforations, so that a correspondingly large perforation can gradually be formed.

In all of these cases, the number of times a needle point is kicked into the same location is chosen so large that the perforation reaches the desired size.

Further embodiments of the device in which the workpiece is rolled over a needle field, in particular the mechanism used for rolling, expediently a conveyor belt running obliquely against the needle field, are also the subject of further claims.

• Fig. 1 eine Stirnansicht und
• Fig. 2 eine Draufsicht einer erfindungsgemäßen Vorrichtung, mit der Hülsen erfindungsgemäß perforiert und/oder zurechtgeschnitten werden können,
• Fig. 3 in vergrößertem Maßstab in Stirnansicht eine Perforierwalze beim Bearbeiten eines von Tragwalzen gehaltenen Werkstückes,
• Fig. 4 eine der Fig. 3 entsprechende Darstellung einer Vorrichtung für Werkstücke größeren Durchmessers mit zwei Nadelwalzen od. dgl.,
• Fig. 5 eine Seitenansicht einer profilierten Tragwalze für ein mit breiten Wellen versehenes Werkstück,
• Fig. 6 eine der Fig. 5 entsprechende Darstellung, wobei das Werkstück eine engere, der Tragwalze entsprechende Profilierung aufweist,
• Fig. 7 eine Teil-Seitenansicht einer Vorrichtung mit Nadelringen insbesondere für den Antrieb des Werkstückes sowie vorzugsweise mehreren dazwischen angeordneten Schneidwerkzeugen zum Herstellen von Hülsen oder Ringen,
• Fig. 8 bis 10 die Funktion eines mit einer elastischen Arbeitskante versehenen Auswerfers für ein Werkstück,
• Fig. 11 eine abgewandelte Vorrichtung, bei der ein Werkstück mittels eines von oben an ihm angreifenden Transportbandes über ein feststehendes Nadelfeld gerollt und dabei vorzugsweise immer stärker angepreßt wird,
• Fig. 12 ein Ausführungsbeispiel, bei dem die Achsen der Nadelträger quer, insbesondere rechtwinklig zu der des Werkstückes stehen und
• Fig. 13 eine Stirnansicht der in Fig. 12 dargestellten Vorrichtung.

The invention is described in more detail below with its details that are essential to it, using the drawing. It shows in a partially schematic representation:

• Fig. 1 is an end view and
• 2 shows a top view of a device according to the invention, with which sleeves can be perforated and / or cut to size according to the invention,
• 3 is an enlarged front view of a perforating roller when machining a workpiece held by support rollers,
• 4 a representation corresponding to FIG. 3 of a device for workpieces of larger diameter with two needle rollers or the like,
• 5 is a side view of a profiled support roller for a workpiece provided with wide shafts,
• 6 shows a representation corresponding to FIG. 5, the workpiece having a narrower profile corresponding to the support roller,
• 7 shows a partial side view of a device with needle rings, in particular for driving the workpiece, and preferably a plurality of cutting tools arranged therebetween for producing sleeves or rings,
• 8 to 10 the function of an ejector provided with an elastic working edge for a workpiece,
• 11 shows a modified device in which a workpiece is rolled over a stationary needle field by means of a conveyor belt acting on it from above and is preferably pressed ever more strongly,
• Fig. 12 shows an embodiment in which the axes of the needle carrier are transverse, in particular at right angles to that of the workpiece and
• Fig. 13 is an end view of the device shown in Fig. 12.

A device designated as a whole with 1 is primarily used for concentric or rotationally symmetrical hollow bodies or workpieces 2, z. B. textile sleeves to perforate. In addition or instead of this, the device 1 can, according to the following description, also be designed or set up to separate such workpieces 2 from continuously or intermittently blown hollow bodies and, under certain circumstances, also to cut them into several sleeves or rings. Overall, the device 1 described below thus allows the production of rings or sleeves and / or their perforation. One can essentially see in the device 1 a magazine 3 from which the blanks are fed via a guide 4 to the actual processing to be described in more detail below. The processing station is generally designated 5 in FIG. 1.

Following the processing station 5, approximately in continuation of the guide 4, a slide 6 or the like is arranged, via which the finished workpieces 2 can be removed. In Fig. 2 it is indicated that the workpieces 2 z. B. can reach a conveyor belt 7.

The processing station 5 is particularly important for the present invention, which is shown on an enlarged scale, particularly in FIGS. 3 and 4, for the case in which the workpieces 2 are to be perforated.

3 and 4, it can be seen above all that the device 1 and in particular its work station 5 have a holder for the workpiece 2 to be described in more detail and at least one (FIG. 3) or two (FIG. 4) with perforation needles 8 or the like. Carrier body 9 occupied. In this case, drive means are provided for repeatedly inserting the needles or styli 8 into the surface or wall of the hollow body 2. In this exemplary embodiment according to FIGS. 3 and 4, rotatable support rollers or rings 10 are provided as holders for the workpiece 2, and the needle carrier 9 is also a rotating body, the circumference of which is occupied by the needles 8 or the like is and whose axis of rotation runs parallel to the axes of rotation of the support rollers 10 of the hollow body 2 to be perforated and also to the axis thereof. It can be seen in FIGS. 3 and 4 that in the use position the needle carrier 9 with its axis approximates the workpiece so far is that the needles pierce and perforate the wall of the hollow body 2 at least after several revolutions.

In the exemplary embodiment, the needle rollers or rings 9 are pivotably mounted relative to the workpiece 2. One can clearly see a swivel arm 11 which is fixed in the device 1 via a joint 12 and can be swiveled upwards and then downwards again according to the double arrow Pf 1 from the position shown in FIGS. 3 and 4. It is clear that in the up position of this swivel arm 11, a workpiece 2 can be ejected after its processing or a new workpiece can be inserted for processing.

It should be mentioned that the needles 8 can have any profile if the perforation is to have a specific shape.

The support rollers 10 and also the needle carrier (s) 9 are expediently adjustable to the diameter of the hollow body 2 to be perforated, the needle rollers being adaptable by pivoting the swivel arm 11, while the support rollers can be mounted with their axes displaceable in parallel. It is advantageous that the needle carriers in particular have a drive and the carrier rollers can run along empty. However, it is also possible that at least one of the support rollers 10 has a drive, not shown.

2, a gear 13 or the like can be seen on an end face of the needle carrier rollers 9, which belongs to the drive of these needle rollers 9 or forms the drive. With this gear 13 further wheels or a chain or the like can then cooperate.

In Fig. 2 is also indicated that the needle carrier 9 can be designed as a needle roller of approximately the length that corresponds to the length of the area of the workpiece 2 to be perforated, in particular that of the entire workpiece 2. It is also indicated in Fig. 2 that z. B. three workpieces can be created and processed at the same time, in particular if 2 knife blades 14 or the like are arranged in at least one space between the support rollers 10 arranged on the circumference for the rotating workpiece. Cutting tools for separating a sleeve with a predetermined length are arranged. 2, for example, three perforated sleeves 15 can be formed from a blank during processing. It can be seen in Fig. 7 that for the separation of individual sleeves 15 from pipes 16 or the like. A plurality of knives 14 arranged at a distance from one another are provided and that rings 17 with spaced rings 8 are preferably used for the rotary drive of the workpieces can be provided. In this case, the focus is on the production of individual sleeves or rings. Of course, additional perforating devices, e.g. H. Carrying body 9 filled with needles 8 can be provided, which work holes into the surface of the sleeves 15 simultaneously or subsequently or before the separation.

The shaft 18, which carries the needle rings 17, belongs to the drive of the processing station 5. In this case, the needles 8 may not need to pierce the surface of the sleeves 15 if it is only a question of the production of pipe pieces or sleeves 15 and whose perforation is not desired.

In this case too, support rollers 10 (not shown in detail) can be provided, these being mainly loose can run along because the needle rings 17 can take over the drive. However, it is also possible to use supporting rollers driven with the needle rings 17 in addition to or instead of the shaft 18.

Both when severing individual sleeves and when perforating them, a plurality of needle rings 17 and / or needle rollers 9 can be provided for the rotary drive and / or for the actual perforation, in particular for larger workpieces 2, these needle rings or rollers in the longitudinal direction one behind the other and / or on the circumference of the workpiece can be distributed. The former can be seen in FIG. 7, the latter in FIG. 4.

The above-described device and in particular the work station 5 shown in FIGS. 3 and 4 allow a perforating process with heated needles 8 without these needles having to be connected to a heater. It is namely possible by the arrangement described above that repeated piercing or intervening at the points of the workpiece 2 to be perforated with one or more needles and that the punctures or interventions are repeated so often and so quickly that the several times in the heat the resulting perforations into the needle tips by the friction itself. Especially when perforating from Thermoplan AG _- stischem plastic existing workpieces 2 the implementation of true perforation is supported from an initially small puncture by said heating or heating and outreach possible.

The hollow body 2 to be perforated is rotated in this perforation and the rotating body 9 occupied by the needles 8 rotates in the opposite direction, so that a kind of toothing is generated between the needles and the latter perforations are formed. The circumferential circle extending through the needle tips dips into the surface of the body to be perforated or even penetrates it, the speed of rotation being able to be selected so that the needle tips repeatedly immersed in the same place produce the abovementioned frictional heat. It is not important that the same needle always hits the same hole, but it is only necessary that some needle always hits the same hole. As already mentioned, the rotating body 2 to be perforated can be rotated by the rotation of the needle carrier (s) 9 and the positive engagement that occurs in the process.

The self-heating needles 8 are expediently blown on and / or treated preparatively to adjust their temperature, in particular wetted with a coolant. A liquid coolant can be applied, in particular brushed, by atomization or as dripping oil.

For this purpose, one can see in FIGS. 3 and 4, in addition to the respective needle roller 9 or the like. Perforating tool, axially parallel to this, a channel 19 for blowing air with openings 20 directed against the needles 8. However, through this channel 19 and the openings 20 coolant can also be supplied.

Furthermore, both in FIG. 3 and in FIG. 4, a brush 21 can be seen in each needle roller 9 for applying a liquid coolant to the needles 8, said brush 21 engaging with its bristles 22 in the area of at least the tips of the needles 8.

It has already been mentioned that especially the needle rollers 9 or 17 can be pivoted away from the workpiece if this be is working and should be ejected. For this purpose, at least one ejector 23 is arranged opposite the attack of the needle rollers 9 or rings 17 and / or cutting knife 14 in the region of the workpiece 2. In Fig. 3 it is shown that a single ejector is sufficient for a smaller workpiece, while it is indicated in Fig. 4 that several ejectors 23 can be provided, especially for larger workpieces.

The design and operation of the ejector 23 can be seen particularly well in FIGS. 8 to 10. It is important that the ejector 23 is connected to the pivot bearing of the needle roller 9 or the like, or at least works synchronously in such a way that when the needle roller swings away 9 of the finished workpiece 2, this is acted upon by the ejector 23 between the support rollers 10 and is lifted out of the latter.

In the exemplary embodiment, the ejector 23 is designed as a ruler or the like, which is mounted approximately parallel to the workpiece 2 and has an elastic narrow side 24 which acts on the workpiece 2 and extends over at least part of the workpiece length. On its working edge or its narrow side 24, the ejector 23 in the exemplary embodiment has an elastic lip 25 which has a tube-shaped or loop-shaped cross section for adaptation to workpiece movements taking place during ejection. This makes it possible to gently eject even somewhat flexible workpieces. 8 shows the ejector 23 initially in the rest position. When ejecting the ejector 23 is moved in the direction of arrow Pf 2, whereby the workpiece is raised. If this has overcome the upper support roller, it rolls away laterally over the chute 6, which is facilitated and supported according to FIG. 10 by the flexible hollow lip 25. The lip 25 can follow this sideways movement somewhat according to the arrow Pf 3 of the workpiece and prevent it from falling back into the space between the support rollers. It contributes to the fact that this elastic lip 25 is resiliently elastic.

A side view of a schematic representation of the cutting knife (s) 14 can also be seen in FIGS. 3 and 4. It is clear that these cutting knives 14 with their cutting edge 26 are preferably at an acute angle to the surface of the workpiece 2 and preferably gradually during the cutting cut deeper into the workpiece and retractable after cutting while rotating. This retraction movement with simultaneous rotation of the workpiece can bring about an easy release of the knife from the cut formed by it and remove any burr that may occur. To separate short sleeves 15 or the like. Ring-shaped workpieces with knife blades 14 that are close to one another, these and in particular their cutting edges can be offset in height, so that they attack the workpiece at different times when it is inserted into the workpiece surface and do not deform it as far as possible and do not deform it generate great cutting resistance.

Another advantage of the pulling cuts produced by the knife blades 14 described and their cutting edges 26 and the still ongoing rotary movement of the workpieces when the knife blades are pulled out of the cut is that the cutting edges can sharpen the blades again and again, so that the cutting process to a certain extent is self-sharpening.

In Figures 5 and 6 it is shown that for perforation Ren and / or separation of workpieces 2 with a profiled surface, the support rollers 10 may have an analog counter-profiling. 5 shows an example in which a strongly profiled support roller 10 engages a workpiece with relatively wide shafts.

FIG. 6 shows a solution in which the support roller 10 also shown in FIG. 5 for workpieces having ring-shaped profiles 27 has zones 28 and 29 with groups of stronger counter-profiles 30 and those with weaker counter-profiles 31. It can be clearly seen how the stronger profiles 30 fully engage in the profiles 27 of the workpiece, while the weaker counter profiles 31 only partially protrude into the profiles 27, so that the workpiece can adapt well to the support roller in the event of inaccuracies.

A modified embodiment of a work station for perforating tubes 2 of any shape in cross section is shown schematically in FIGS. 12 and 13. Here, at least one needle wheel, in the exemplary embodiment several needle wheels arranged at an angle to one another on the circumference of the hollow body 2 to be perforated, the axes of rotation of which are transverse is arranged to the feed direction of the workpiece 2 indicated by the arrow Pf 4. These needle wheels 32, several of which are arranged one behind the other in such a way that their needles 8 can also repeatedly enter the same perforations, cause the workpiece feed if one or more of them are driven. In the exemplary embodiment, the axes of these needle wheels 32 are arranged at right angles to the feed of the workpiece 2 to be perforated and they are also distributed over the circumference of this workpiece 2 so that corresponding rows of per forations can arise.

If the axes of rotation of the needle wheels 32 are arranged somewhat obliquely, perforations lying on helical lines can be produced under certain circumstances.

The above-described method for perforating, which consists primarily in the fact that Madeln enter the same perforations several times in succession so quickly that frictional heat also arises, can also be carried out with the aid of a device shown in FIG. In this case, one or more essentially flat needle fields 33 with fixed needles 8 are provided, via which the workpieces 2 to be perforated can be rolled off. It can be clearly seen how in FIG. 11 a workpiece 2 is gradually moved from its right edge to the left, that is to say in the direction of the arrows Pf 5, and thereby rolls according to the arrows Pf 6.

In order to unroll the hollow body 2 to be perforated via this needle field 33, a conveyor belt 34 running obliquely in the direction of advance against the needle field 33 is provided, which on the opposite side of the needle field 33 is frictionally and / or positively on the hollow bodies by means of projections, tips or the like 2 attacks and presses them gradually in the direction of advance as they roll onto the needles 8. A carrier 35 of this conveyor belt 34 can be adjusted according to the double arrows Pf 7 with regard to its total distance from the needle field 33 and also with regard to its inclined position.

In this case, at least one rotating circular knife 36 and / or at least one is preferably pivotable for the separation of sleeves 15 which can be advanced by means of the conveyor belt 34 acting on their circumference bare knife blade 41 shown in Fig. 11 is provided.

11 that the needles 8 can preferably be cooled with a gaseous or liquid coolant through bores 37 in their carrier 38.

The conveyor belt 34, which is designed as a friction belt, can be pressed against the needle field 33 by means of a pressure plate 39, in order to ensure the desired unrolling of the workpieces despite the resistance in the perforating and / or cutting process.

In particular for changing the inclined position of the conveyor belt, it can be pivotably mounted on an axis 40 running on one side about an axis 40 parallel to the needle plane. It can be seen that the carrier 35 also carries the knife 36.

Overall, this results in a fully automatic and spindle-free device for producing small pipe sections and in particular perforated sleeves. The entire process can be carried out economically and quickly, and it is avoided that perforation residues occur during perforation, which could seriously disrupt the subsequent processes in which the perforated sleeves are required. Such residues can e.g. B. occur if the perforations were punched out. Such stamped parts are avoided by the heated needles. At the same time, by avoiding spindles that hold the workpieces, there is a simple workpiece alignment, which permits correspondingly precise machining, be it when perforating or when separating. In addition, a spindle-free design is particularly quick when it comes to loading and economical.

Special heating for the perforating needles and the associated energy expenditure are avoided.

All features and construction details shown in the description, the summary, the claims and the drawing can have significant meaning both individually and in any combination with one another.

Claims (36)

1. Method for perforating and / or cutting concentric or rotationally symmetrical hollow bodies on their walls, in particular of winding carriers such as. B. textile sleeves preferably made of plastic,
characterized in that the points to be perforated on the workpiece (2) are repeatedly punctured with one or more needles (8), stamps, pins or the like, and in that the punctures are repeated so often and so quickly that the repetitions are repeated heat the needle tips or the like which are immersed in the perforations by friction. 2. The method according to claim 1, characterized in that the hollow body to be perforated is rotated during the perforation and that at least one with needles (8) or the like. Also rotating rotating body (9) is set in counter-rotation, the by Dipping the needle tip or the like. Circumferential circle in the surface of the body to be perforated and the speed is selected so that the needle tips or the like which are repeatedly immersed in the same places are heated by friction. 3. The method according to claim 1 or 2, characterized is characterized in that the rotating body to be perforated is rotated by the rotation of the needle carrier (s) and the temporary positive locking of the needles piercing it or the like. 4. The method according to any one of claims 1 to 3, characterized in that the self-heating needles (8) or the like. Blown to adjust their temperature and / or treated preparatively, in particular wetted with a coolant. 5. The method according to claim 4, characterized in that the liquid coolant is applied by atomization or as dripping oil, in particular brushed. 6. The method in particular according to one of the preceding claims, characterized in that a continuously or intermittently blown hollow body is rotated and cut off at its later end faces, preferably simultaneously with or after a perforation process. 7. Device for perforating concentric or rotationally symmetrical hollow bodies, in particular of winding carriers, for. B. of textile sleeves preferably made of plastic, in particular according to one of claims 1 to 6, characterized in that it has a holder for the workpiece (2) and at least one with perforation needles, punches, pins or the like. Carrying body (9) and that drive means are provided for repeatedly inserting the needles or the like into the surface or wall of the hollow body (2). 8. The device according to claim 7, characterized in that there are provided as a holder for the workpiece on the outer periphery attacking, rotatable support rollers and that the needle carrier (s) (9) is (are), the circumference with needles (8) or. Like. Is occupied and whose axis of rotation runs parallel to those of the support rollers (10) and the hollow body to be perforated. 9. Apparatus according to claim 7 or 8, characterized in that the needle roller (s) (9) or the like .. is (are) pivotally mounted relative to the workpiece. 10. Device according to one of claims 7 to 9, characterized in that the needles or the like. Profiled. 11. Device according to one of claims 7 to 10, characterized in that the support rollers (10i and / or the (the) needle carrier (9) on the diameter of the hollow body to be perforated (2) are adjustable and that the (the) needle carrier the machining is (are) radially adjustable against the inside of the hollow body. 12. Device according to one of claims 7 to 11, characterized in that the needle carrier (9) is designed as a needle roller of preferably at least the length which corresponds to the length of the area of the hollow body to be perforated, optionally of the entire hollow body. ₁₃ . Device in particular according to one of claims 7 to 12, characterized in that arranged in at least one space between the circumference th support rollers (10) for the rotating workpiece (2) at least one knife blade or the like. Cutting tool for severing a sleeve or the like. is arranged with a predetermined length from a blank. 14. The apparatus according to claim 13, characterized in that for the separation of individual sleeves from pipes or the like. Blanks a plurality of spaced-apart knives or the like are provided and that with needles or the like. Occupied, spaced-apart rings od. Like. Are preferably provided for the rotary drive of the workpieces. 15. The device in particular according to one of claims 7 to 14, characterized in that several needle rings (17) and / or needle rollers (9) are provided for the rotary drive and / or the perforation, in particular for larger workpieces (2). ₁ 6. Device according to one of claims 7 to 15, characterized in that at least one of the support rollers (10) is connected to a drive. 17. The device in particular according to one of claims 7 to 16, characterized in that in addition to the needle roller (9) or the like. Preferably axially parallel to this, a channel for blowing air or against the needles or the like. Openings (20) and / or are provided for the supply of a cooling liquid. ₁ 8. Apparatus according to claim 17, characterized in that for applying a liquid coolant to the needles (8) or the like. At least one with their bristles (22) at least in the region of the needle tips or the like engaging brush (21) or the like is provided. _19th Device according to one or more of claims ₇ to 18, characterized in that at least one ejector (23) is arranged on the workpiece (2) counter to the action of the needle rollers (9, 17) and / or cutting knife (14). 20. The apparatus according to claim 19, characterized in that the ejector (23) is connected to the pivot bearing of the needle roller (9) or the like and when the needle roller (9) or the like is pivoted away from the finished workpiece (2). this lifts synchronously with this pivoting away movement between the support rollers (10). 21. Device according to one of claims 7 to 20, characterized in that the cutting knife or blades (14) with their cutting edge (26) are preferably obliquely at an acute angle to the surface of the workpiece (2) and preferably deeper into the cutting cut Workpiece inserted and after cutting can still be retracted while rotating. 22. Device according to one of claims 7 to 21, characterized in that for separating short sleeves (15) or in particular ring-shaped workpieces with closely spaced knife blades (14) these are offset in height and offset in time when piercing the workpiece surface on the Grip the workpiece. 23. The device according to one of claims 7 to 22, characterized in that for perforating and / or Cutting workpieces (2) with a profiled surface, the support rollers (10) have an analog counter-profile. 24. Device according to one of claims 7 to 23, characterized in that the support rollers (10) for annularly arranged profiles (27) have workpieces (2) zones (28, 29) with groups of stronger counter-profiles and those with weaker counter-profiles . 25. Device according to one of claims 7 to 24, characterized in that the ejector (23) or the like as a ruler mounted parallel to the workpiece (2). Rod is formed with the elastic narrow side (24) acting on the workpiece (2) and extends over at least part of the workpiece length. 26. Device according to one of claims 7 to 25, characterized in that the ejector (23) on its working edge (24) has an elastic lip (25) preferably with a loop-shaped cross-section for adaptation to workpiece movements taking place during ejection. 27. The device according to one of claims 7 to 26, characterized in that the elastic end of the ejector is designed to support the ejection process resiliently elastic. 28. Device in particular according to one of the preceding claims, characterized in that for perforating hollow bodies, preferably from hollow bodies or the like directly emerging from an extrusion device or the like. At least one needle wheel or the like preferably several needle wheels arranged at an angle to one another are provided, the axis of rotation of which is arranged transversely to the feed direction of the workpiece. 29. Device according to one of claims 7 to 28, characterized in that a plurality of needle wheels are arranged one behind the other in the feed direction. 30. Device according to one of claims 7 to 29, characterized in that the axes of the needle wheels are arranged at right angles to the feed of the workpiece to be perforated (2) and that these needle wheels for a tube with any cross-sectional shape are distributed around its circumference. 31. The device in particular according to one of the preceding claims, characterized in that for perforating preferably rotationally symmetrical bodies fixed, in particular in one plane, needle fields are provided, via which the bodies to be perforated can be rolled off. 32. Device according to one of claims 7 to 31, characterized in that for unrolling hollow bodies to be perforated (2) via a needle field (33) a conveyor belt (34) or the like preferably running obliquely in the feed direction against the needle field (33). It is provided that engages in a form-fitting manner on the hollow bodies (2) on the side opposite the needle field (33), in particular by friction and / or by means of projections, tips or the like, and presses them deeper onto the needles (8) in the feed direction when they roll. 33. Device according to one of claims 7 to 32, there characterized in that at least one rotating circular knife (36) and / or at least one preferably pivotable knife blade is provided for the separation of sleeves (15) or the like, which can be advanced by means of a conveyor belt (34) engaging on their circumference. 34. Device according to one of claims 7 to 33, characterized in that the needles or the like. Can preferably be cooled by drilling their carrier with a gaseous or liquid coolant. 35. Device according to one of claims 7 to 34, characterized in that the conveyor belt designed as a friction belt can be pressed against the needle field (33) or the like by means of a pressure plate. 36. Device according to one of claims 7 to 35, characterized in that the friction band (34) is pivotally mounted on one side about an axis running parallel to the needle plane.

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