DE4421465A1 - Ultrasonic welding and cutting tool for fabrics - Google Patents

Abstract

The appts. for the application of ultrasonics to materials, especially for ultrasonic cutting and welding such as in the prodn. of labels and the like, has an axial passage drilling (40) in at least one section (24) of the appts. (20) with a threaded holder (42) at one end for a partially screwed connecting bolt (44). A locking pin (45) with an external threading is fitted into the threaded holder (42) section with its trailing operating end (46) used to turn the pin (45) to apply pressure to the connecting bolt (44).

Description

The invention is directed to a device which in the preamble of Claim 1 specified type, the ultrasound device in several longitudinal cuts are made of different materials, (DE-39 25 788 A1).

These ultrasound devices are hereinafter referred to as "devices" and their longitudinal sections are called "sections".

To tapes, e.g. B. to produce label tapes, you first weave one Broad weave web in which the desired band pattern in neighboring Path zones are generated in multiple sequences. Then the wide fabric Cut the path at the transition point between these path zones. Therefore heated wires were originally used that melt Cut in the fabric web and created the cut threads that fused together. The resulting melting edges were hard and brought problems that require additional measures other (DE-39 37 947-A1). To cut the quality problems when cutting improve, the ultrasonic cutting was already used for fabrics (EP-0 534 300-A1).

The known devices for ultrasonic cutting required a lot Space. The axial length of the devices had to match the sound wave length be tuned to their resonance frequency, which in turn is an exact match solution of the high frequency of the RF generators operating them. Each device has a relatively steep, sharply defined resonance curve  ve on. Already manufacturing tolerances for devices of the same type shifted the maxima of the steep resonance curves to each other and it must Use an adapted HF generator to operate each device be det. Each HF generator had to be at the respective frequency position of the resonance maximum must be matched by the associated device. The be Known devices were expensive and reacted with the location of their reso frequency sensitive to structural deviations. The efficiency the known devices were relatively small.

The invention has for its object an inexpensive device to develop the type mentioned in the preamble of claim 1, the thanks to its compact design and economical, reliable operation distinguished. This is according to the invention by the in the characteristic of Claim 1 measures achieved, the following special Importance.

The invention has recognized that the threaded engagement with the connector problems arise when axially bracing two sections of the device. Due to the surface pressure between the contact surfaces Chen the sections creates an axial tension in the connecting bolt. However, this tension only affects in places, e.g. B. only until to a certain depth of the interlocking thread flange between the connecting bolt and the two threaded receptacles in the sections. If used as intended, use ultrasound the non-clamped pieces of the connecting bolt in vibrations, which results in both material wear and power loss of the ultrasound operation. Even if you look at the connecting bolts on one or both ends for contact with the blind hole ends of the thread holder brings or the connecting bolts by gluing in the thread receptacles fixed, difficulties arise. First is the immersion depth of the Connection bolt fixed in the two thread mounts and can cannot be changed afterwards. Furthermore, the burdens lead at the joint between materials of different hardness Abrasion.

The invention avoids these problems through a special, adjustable Connection between two sections of the device, with which sur  The properties of the device, depending on the desired condition, can be easily adjusted. The invention proposes to do this except the connecting bolts provided between two sections a counter pin provided with an external thread in the Arrange the thread of a section defined by Rotation with its one, pressure-effective end against the forehead the connecting bolt is pressed. For turning the counter pin is the thread of this section as a continuous axial bore formed, through which an actuating tool can be inserted. The Actuating tool engages on an actuator facing the axial bore end of the counter pin. This makes it possible to change the immersion depth of the connecting bolt to choose freely and the desired setting to fix with the counter pin. You can also use the turning tool a defined counter pressure from the counter pin to the connecting bolt be exercised with the surface pressure at the point of contact be coordinated between the mutually braced sections can.

By the immersion depth of the connecting bolt on the one hand and by the Counter pressure of the counter pin on the other hand, both the location of the Resonance frequency maximum of the whole device as well as the vibration amplitude of the ultrasound delivered to the material to be treated to be flowed. You can retrofit devices of different lengths easily tune to an ideal resonance frequency and thus the adjustment to reach a given RF generator. It can be used with a common RF generator easily a whole host of devices control in a safe parallel operation.

Changes in the resonance frequency result with constant back pressure the counter pin mainly by changing the immersion depth of the verbin dung bolt. Even structurally different devices can be viewed in this way Lich their resonance frequency and the bandwidth of their resonance readjust the frequency. The size of the given vibration amplitude against it is mainly by changing the generated over the counter pin Back pressure can be influenced. Influencing the natural vibrations of the Connecting bolt can already be seen when adjusting the counter pin between between 10-30 µm. The invention is particularly advantageous in devices  usable, whose total length is about half the sound wave length of their Is resonance frequency. In this case, the result is relatively flat Resonance curves with large frequency bandwidth that are no longer an accurate one Adjustment of the device lengths to a certain sound wave length require.

Further measures and advantages of the invention result from the following description and the drawings. In the drawings, except a prior art, the invention in several embodiments shown. Show it:

Fig. 1 in a perspective view and partially schematically, a portion of a weaving machine having a plurality of ultrasonic devices of the invention, the cut of the produced web of the wide tissue strips for labels,

Fig. 2 is a partial axial section through an ultrasonic apparatus according to the prior art,

Fig. 3 shows schematically two resonance curves, namely for the known apparatus of Fig. 2 on the one hand and for the inventive device of FIG. 4 on the other hand,

Approximately the same scale, Fig. 4 in one of the Fig. 2 illustration corresponding to the device according to the invention, which constitutes the active part of the device,

Fig. 5, greatly enlarged the lower portion of the apparatus of Fig. 3,

Fig. 6 shows a cross section through a weaving machine with a respect to Fig. 1 modified embodiment,

Fig. 7 in approximately natural size in cross section a portion of the device shown in Fig. 6 and

Fig. 8 shows a further application of the device according to the invention in a punching tool.

On a weaving machine indicated in FIG. 1, a web 10 is produced between the warp threads 11 and one or more weft threads 12 by means of customary technical weaves. Any pattern 13 can be woven in, which is of particular interest if labels are to be woven on this weaving machine. In this case, the patterns 13 of the labels are produced lying side by side in numerous web zones as wide fabrics in this web 10 . This web 10 is then fed to a group of ultrasound devices 20 which produce longitudinal cuts 14 at the desired locations and cut the web 10 into individual strips 15 . During the weaving process, the cut strips 15 are continuously subtracted in the direction of the movement arrow 77 . Then, according to the length of the individual patterns 13 , they are divided into sections and form the labels which can be attached to items of clothing or the like.

These devices 20 are part of a device, which includes a high-frequency generator 50 which can be seen in FIG. 1 and which will hereinafter be referred to as "HF generator" for short. The operated with conventional electrical alternating current HF generator 50 generates higher-frequency alternating voltages, for. B. between 20 and 30 kHz, and this leads via electrical lines 31 to the individual devices 20 , each forming an active part of the device according to the invention and z. B. are on one side 16 of the web. On the opposite side of the web 17 there is a passive part 30 of the device, which will be referred to as "anvil" in the following. The web 10 to be cut is located between the active parts 20 and the anvil 30 . In the device 20 , as will be explained in more detail below, the alternating electrical voltage is converted into ultrasound of the same frequency and, after focusing the oscillation power, transmitted to the web 10 .

The device 20 acts like an ultrasound-operated hammer and, with its end 28 contacting the web, executes a mechanical hammer frequency of 20,000 to 30,000 pulses per second. The friction resulting from this hammer movement causes the web material to heat up, which can be used to separate or weld the web 10 . With a pointed hammer end 28 there is an ultrasonic cut and with a flat hammer end there is a weld. The edges merge along the cut, which is why fraying of the tissue at the interfaces 14 is avoided. In addition to or instead of melting the material of the web, the web can also be mechanically destroyed at the interface 14 . You can therefore also non-meltable material, e.g. B. cotton threads, use in the web 10 .

The known device 20 'had the following, from Fig. 2 recognizable appearance. The electrical high frequency coming from the HF generator is converted into mechanical vibrations in the device, for which purpose the device 20 is divided into a plurality of longitudinal sections 21 to 26 , which, as already mentioned, are referred to below as "sections" for short. These sections are cylindrical and firmly connected by an axial screw 18 'and a connecting bolt 19 '. The electrical signals arrive at two piezoelectric ceramics, which oscillate in phase opposition to one another during operation and form an electro-mechanical transducer 21 , which in the following is to be called "piezo element" for short. The piezo element 21 'is clamped between two sections 22 ', 23 ', which consist of mutually different material, by means of the screw 18 '. The piezo element 21 'generates sound vibrations which pass to the other sections 22 ', 23 'located on both sides thereof in very different ways. On the outer portion 22 'should be the smallest possible vibration power, which is why it is made of heavy material, such as steel, and will be referred to below as a vibration reflector. The on the opposite side of the piezo element 21 'located third section 23 ' of the device, on the other hand, should absorb as high a portion of the generated vibration power as possible and transmit it to the following horn radiator 26 ', which will be described in more detail, where it is used. Therefore, this section 23 'consists of a light material, such as aluminum, and will be referred to below as "vibration transmitter".

The horn emitter 26 'is connected via the threaded pin 19 ' to the preceding vibrator 23 'and in this case consists of expensive titanium. The horn 26 'is in turn divided into two sections 24 ', 25 ', of which section 24 ' focuses the recorded Schwingungslei stung, which is achieved by a taper 27 '. From this section 24 'is therefore briefly called "focusing section" below. The one-piece end section 25 'in the present case is then the actual "working section" which sits a sharpened cutting edge 29 ' and contacts the web 10 with the actual horn end 28 '. The known horn 26 'is, according to the length dimension 36 ' of Fig. 2, compared to the length 33 'of the preceding vibrator 23 ' formed about twice as long and therefore, for reasons of space, only partially shown in Fig. 2.

The individual sections of the vibrator 24 'must have a precisely matched to the ultrasonic vibration used, from Fig. 2 re axial length 32 ', 33 ', 36 ', so that at the horn end 28 'there is a sufficient vibration performance. The generated in the device 20 'ultra sound leads to so-called "standing waves", which are essentially longitudinal waves, but for better clarification, in the right half of Fig. 2, in the form of transverse vibrations 37 ' was clarified. These waves 37 'have a so-called "vibration belly" at 34 ' with a large amplitude and a "vibration node" at 35 'with an amplitude of zero. The standing waves 37 'have a wavelength which depends on the one hand on the ultrasound frequency and on the other hand on the medi in which they are formed. In order to obtain the optimal vibration performance at the horn end 28 ', it was necessary in this known device 20 ' to coordinate the generated ultrasound frequency as follows with the axial lengths 32 ', 33 ', 36 'of the individual sections:

In the middle of the piezo element 21 ', a vibration node 35 ' of the standing shaft 37 'should come about and the outer vibration reflector 22 ' should have an axial length 32 'which, taking into account the speed of sound in its material, exactly half a sound wave len- Length corresponds, i.e. λ / 2. Then arises at the top of the reflector Re 22 'an antinode 34 '. Taking into account the material used in the vibration generator 23 ', the axial length 33 ' there must again correspond to half the sound wave length λ / 2, so that a vibration antinode 34 'arises at the transition to the adjacent horn radiator 26 '. The axial length 32 ', 33 ' of the two sections 22 ', 23 ' of Fig. 2 is λ. The same applies to the axial length 36 'of the horn 26 ', which, as the abbreviated representation of the standing wave 37 'in Fig. 2 illustrates, must also be equal to the sound wave length or an integral multiple thereof. The tapering 27 'must be taken into account. Only then arises at the horn end 28 'we a swinging antinode 34 '. Within the axial distance 36 'is the vibration node 35 '. As can be seen, the known device 20 'has a total length 38 ', which is at least equal to the sound wave length in the various materials concerned, ie λ. According to the great lengths 38 ', the individual sections of the known Geres tes 20 ' also have a large diameter 39 '.

As already mentioned and shown in Fig. 3, the devices 20 'of the known devices have a steep, relatively sharply defined resonance curve 51 '. In Fig. 3, the supply amplitude to be transmitted oscillations E f is plotted in function of the effective sound frequency. The known resonance curve 51 'is very narrowly limited to the effective resonance frequency f₀. Even a small deviation of the generated sound frequency leads to such a detuning that at the contacting horn end 28 'no longer a stable antinode 34 ' of the standing wave 37 'arises. It has therefore been necessary to match the axial lengths 32 ', 33 ', 36 'exactly with the effective ultrasonic frequency. The tuning is usually done via the AC voltage generator, which had to be readjusted with its electrical output frequency. But you also get the known device 20 'better conditions if the special connections explained in FIGS . 4 and 5 according to the invention are also used here.

Therefore, previously two devices 20 'of the same known type had to be operated by separate RF generators. Already the tolerances resulting from the production led to differences in the axial lengths 32 ', 33 ', 36 ', which made a different setting of the resonance frequency f₀ necessary. It therefore meant a great deal of equipment and space if, according to FIG. 1, one wanted to cut a wide fabric web 10 with numerous devices into many fabric strips 15 . In addition, in the known device 20 ', the piezo element 21 ' had to be operated in pulses, that is, with rest phases.

The invention brings a considerable improvement over the prior art in several respects. This can be illustrated using the corresponding device 20 according to the invention shown in FIGS. 4 and 5. To designate corresponding components, the same reference numerals are used as in the device 20 'of Fig. 2, but, to distinguish it, marked without a dash ('). It is sufficient to go into the differences and special features, while the previous description applies.

A special feature of the device 20 according to the invention is that the horn 26 sits directly on the transducer 21 , which here too consists of two piezoelectric ceramics. In addition to the horn radiator 26 and the piezo element 21 , only one vibration reflector 22 is provided. These components 26 , 21 , 22 are firmly clamped together by an axial screw 18 . The shaft of the screw 18 passes through an axial opening in the reflector 22 and in the piezo element 21 and is there, because of the electrical connections of the lines 31 , partially insulated by a hose. The horn 26 is composed of two sections 24, 25 of different material, namely the already mentioned in connection with Fig. 2 and the focusing section 24 versehe with an arcuate sharpened cutting edge 19 at the end of horn 28 nen working portion 25. The focusing section 24 consists of a light metal alloy, while the working section 25 consists of steel with a hardness of more than HRC 60 . The focusing section 24 is provided with a continuous, here stepped axial bore 40 which has two threaded receptacles 41 , 42 in the end regions. The clamping screw 18 is screwed into the thread of the wide upper thread holder 41 . As can already be seen from a comparison of the two approximately true-to-scale representations of FIG. 2 on the one hand and FIG. 4 on the other hand, the device 20 in the invention is initially shorter in comparison with the known device 20 '. Therefore, the diameter 39 of the components in the device 20 according to the invention can also be reduced.

The axial length 32 of the reflector 22 is shortened because it has to be at most 1/8 of the effective sound wave length λ. In the exemplary embodiment shown in FIG. 4, the reflector 22 is made of stainless steel and has an axial length 32 which corresponds only approximately to 1/8 of the effective sound wave length. It was found that the axial length of the individual sections can surprisingly vary considerably without significantly impairing the good efficiency of the device 20 . This also applies to the axial length 36 of the horn radiator 26 , which, as practice shows, can easily vary in the range between 2/8 to 6/8 of the effective sound wave length. In the present case, a so-called “hard aluminum”, namely an alloy of aluminum, magnesium and silicon, is used for the horn radiator 26 . Measured from the center of the piezo element 21 , the horn emitter 26 in the present case has an axial length 36 of approximately 3/8 λ. The total length 38 of the combination 20 which can be seen from FIG. 4 is approximately λ / 2, that is to say only 1/4 of the total length of the known device 20 'shown in FIG. 2'. In analogy to FIG. 2, the determined standing wave 37 for the device 20 is also shown in FIG. 4 in the form of a transverse wave. The vibration amplitudes of the mechanical vibrations occurring in the abscissa direction are shown on a logarithmic scale. It is ent, as can be seen, at the horn end 28, an antinode 34 with an extremely large amplitude, namely z. B. with a longitudinal deflection of the piezo element 21 of 1 micron and a longitudinal deflection at the horn end 28 up to 30 microns. A vibration node 35 comes to lie approximately in the middle of the piezo element 21 .

The device 20 according to the invention, as shown in FIG. 3, has a more favorable resonance curve 51 than the known device 20 ', which has a broad, largely flattened maximum in the range of the resonance frequency f0. The resonance curve 51 can emit practically the same energy at the horn end 28 in a considerable band range Δf, which lies between two limit frequencies f 1 and f 2 lying on both sides of the resonance frequency ffrequenz. That is, as already gene from the above EXPLANATIO of Fig. 4 is to be appreciated that the relevant axial lengths 32 can be changed on the one hand and 36 on the other hand, without the good efficacy of the device is affected. It is therefore not important to keep the explained total length 38 of the device 20 exactly at half a sound wave length λ / 2. There are no further deviations possible. This has the great advantage that now, as can be seen in FIG. 1, all devices 20 of the same type provided in the weaving machine can be connected to the same HF generator 50 without any problems.

In the horn radiator 26 , the focusing section 24 is clamped to the working section 25 by a common connecting bolt 44 . For this purpose, one end of the connecting bolt 44 is first screwed into the lower threaded receptacle 42 of the through axial bore 40 in the focusing section 24 . In this thread receptacle 42 there is a lock pin 45 , which can be screwed into it with its external thread. At one end 46 there is a screwdriver slot or the like, with which the counter pin 45 can be actuated by a turning tool which is inserted from the opposite end of the through axial bore 40 into the focusing section 24 . By screwing, the counter pin 45 with its opposite pressure end 47 is pressed against the connecting bolt 44 , which is illustrated in FIG. 5 by the counter pressure arrow 48 . By means of the counter pin 45 , two things can be determined. On the one hand, the immersion depth 49 of the connecting bolt 44 is fixed. On the other hand, the axial pressure 48 exerted by the counter pin 45 can be adjusted. As already mentioned, both the position of the resonance frequency maximum f₀ in the resonance curve 51 shown in FIG. 3 and the vibration amplitude at the horn end 28 of the working section 25 can be varied with both measures. The end piece protruding from the focusing section 24 is clamped with a defined torque. For this purpose there is a corresponding axial thread receptacle 43 in the working section 25 . There is a pressure between the contact surfaces 54 of the two sections 24 , 25 , which affects the tension of the connecting bolt 44 in a train. The pressure 48 of the counter pin 45 influences this tension.

In the area of the contact surface 54 , the focusing section 24 has a radial recess 59 , as shown in FIG. 5. In the area of this recess 59 , the threads of the connecting bolt 44 are therefore not in engagement with the threaded receptacle 43 from the working section 25 , which is why the tensioning comes about only in the adjacent region of the connecting bolt 44 . By means of this radial recess 59 , a not exactly aligned course of the threaded receptacles 42 , 43 in the two sections 24 , 25 can be compensated for. The connecting bolt 44 can namely escape laterally in the radial recess 59 . Even if the two contact surfaces 54 between the sections 24 , 25 do not run perpendicular to the pin axis, the radial recess 59 permits an evasive movement of the connecting bolt 44 and causes a uniform surface pressure between the sections 24 , 25 . Such a radial recess 59 , which exposes the connecting bolt 44 in zones, could alternatively or additionally be provided in the focusing section 24 .

These measures in the connection area between two sections 24 , 25 could also be used in other length areas of the ultrasound device 20 . For example, B. an analog counter pin also attack with the located at the opposite end of the focusing section 24 union screw 18 . Furthermore, it is favorable for influencing the resonance frequency and the vibration amplitudes to apply these measures to the devices 20 'with a conventional structure, e.g. B. on the connecting pin 19 'between the two sections 23 ', 24 'of Fig. 2 or the clamping screw 18 ' there.

Several devices 20 can be attached to a common rail 52 , as shown in FIG. 1, which runs transversely to the transport direction 77 of the web 10 during weaving. The distances between the devices 20 can be changed in order to individually adjust the width 55 of the individual strips 15 of FIG. 1 produced by the ultrasonic cuts 14 . The anvil 30 on the opposite side of the web is common to all devices 20 and consists of a continuous rod which also runs transversely to the transport direction 77 of the web 10 . As the cross section of FIG. 6 shows more clearly, the anvil 30 is designed as a hollow tube 53 and its interior is filled with a deformable material 102 of high specific weight, namely in the present case with lead. This can also be clearly seen from FIG. 7, from which the following further important details of the invention can be found.

The device 20 is fastened to the rail 52 via a specially designed housing 60 , which can be made of polypropylene. The housing 60 , which is made of one material, has two projecting, deformable hooks 61 . The rail 52 has associated continuous strips 56 , which are encompassed by the hooks 61 in a mirror image of one another. The hooks 61 engaging on the strips 56 are under a spring tension of the material and hold the housing 60 already by Rei on the rail 52 firmly. The housing 60 has a removable cover, which is removed in Fig. 7, but there, for. B. by screws. Like., Can be attached to the designated 62 locations.

The housing 60 comprises a central chamber 63 , in which the device 20 described vorbe is held. The device 20 is pressed by a Fe 65 against a defined seat surface 64 inside the chamber 63 . The device protrudes with the mentioned working section 25 out of the housing. The spring 65 is supported by a plastic ring 67 made of polytetrafluoroethylene and an elastomer ring 66 made of silicone rubber at the upper end of the above-described reflector 22 of the device 20 . The opposite end of the spring 65, however, lies directly against an inner surface of the housing 60 . A hose 70 , which can bring cooling air in, is arranged in an outer chamber 68 of the housing 60 and opens, as shown in FIG. 7, in the lower region of the above-described middle chamber 63 . The cooling air passes over the device 20 and dissipates the heat to the outside through an opening 69 in the housing 60 . The hose 70 ends can be connected, also in the upper region of the housing 60, in a not shown in detail the hose coupling, to which a in Fig. 7 in Geloë most state shown hose connector 71, which sits on a cooling air inbound input tubing 72nd

In the outer chamber 68 there is also the electrical line 31, already mentioned several times, for the described piezo element of the device 20 . The line 31 is guided through an opening in a partition 73 which separates the two chambers 63 , 68 from one another in the housing 60 . The line 31 ends in a likewise provided in the upper region of the housing 60 electrical connection socket 74 , in which then, if necessary, a corresponding connector 75 shown in FIG. 7 in the released state can be coupled. The connector plug 75 sits on a further leading electrical line section 76 , which is shown in more detail in FIG. 6.

Fig. 7 shows how the horn end 28 presses the web 10 against the anvil 30 opposite and, during the withdrawal movement 77 of the web 10 during weaving, produces the described ultrasonic cut 14 . Another special feature of the invention is that the combination 20 according to the invention can be operated continuously, that is to say without resting phases. In order to be able to maintain the resonance, pulse operation has been required in the prior art. The cooling described above facilitates this continuous operation of the piezo elements.

A parallel toothed rack 57 , which is fastened to the side of the rail 52 and which can also be seen in FIG. 1, is used for the exact positional adjustment of the housing 60 with the device 20 held therein on the rail 52 . The rack 57 protrudes through a lateral cutout into a bore 78 in the housing 60 , which extends essentially parallel to the above-mentioned central chamber 63 and opens out at the upper end of the housing 60 . The housing 60 also has a locking member 82 , which blocks the selected position of the housing 60 on the rail 52 . In the present case, this locking member 82 consists of a gearwheel which is usually always held in tooth engagement with the rack 57 by an elastic member 83 , namely here a helical spring. Then an adjustment of the housing 60 along the rail 52 is blocked. The elastic member 83 can be arranged in an axial extension of the bore 78 described above.

For the longitudinal displacement of the housing 60 on the rail 52 , an actuating tool 80 can be seen from FIG. 7, which has the shape of a shaft with a pinion toothing 81 adapted to the rack 57 on the shaft de. To adjust the housing 60 , the shaft of this actuating tool 80 is first moved in the direction of the axial arrow 79 through the opening into the interior of the bore 78 so that the pinion toothing 81 comes into engagement with the rack 57 . If the actuating tool 80 is then moved in the sense of the arrow 84 also indicated in FIG. 7, the pinion 81 rolls on the rack 57 and moves the housing 60 in a corresponding manner along the rail 52 . The shaft of the actuating tool 80 is namely in the housing bore 78 stored in Drehge. With the axial insertion movement 79 of the actuating tool 80 , the locking member 82 is simultaneously set ineffective. In the present embodiment, namely, the gear 82 is pressed back against the action of the elastic member 83 acting on it and releases the toothed rack 57 .

FIG. 6 shows an embodiment modified from FIG. 1. In this case, one uses a double rail 58 which extends over the wide fabric web 10 and which has two rail parts 52 , 52 'of the type described. These have two groups of housings 60 clamped to them on the two mutually facing rail outer sides 88 , 88 '. As a result, the ultrasonic cuts 14 explained in FIG. 1 can be set even closer than the width 86 that can be seen in FIG. 1 corresponds to the housing 60 shown . The housing 60 located on the second rail part 52 'can namely be arranged in the region of the gaps of the part 52 of this double rail 58 located on the first rail, another group of housings 60 . The two rail parts 52 , 52 'of the double rail 58 are arranged at a defined angle both to one another and to a guide 90 of the fabric web 10 . This guide 90 supports the corresponding two, as a filled tube 53 , 53 'designed anvils 30th

As can be seen from FIG. 6, formed in the manner already described in connection with FIG. 1 manner from the warp yarns 11 and weft yarns 12, the broad fabric 10 at the point marked 85 weaving. The Breitge weave 10 is then passed around a heating element 87 which is located in a spreader. From there, then the wide fabric 10 runs over a threaded rod 89 and then over the described first tube 53 ', to which the first group of devices 20 located in the housings 60 is pressed and the first group of separating cuts are produced. This threaded rod 89 serves to hold the web 10 during the pull-off movement 77 in the desired width. Those zones of the web which have not yet been cut longitudinally there are then guided over the second tube 53 and divided by the second group of devices 20 fastened to the rear rail part 52 . The finished cut strips 15 are then, as shown in FIG. 6, discharged via a further threaded rod 91 , where they are deflected and guided to take-off rollers, not shown, of the weaving machine.

Between the two rail parts 52 , 52 'of the double rail 58 , an intermediate space 92 is created which is open at the top, but can be closed by a profile cover 93 which can be removed for assembly. The profile cover 93 can carry electrical coupling elements 94 to which, via complementary electrical connecting parts 95 , the electrical line sections 76 already described in FIG. 7 for the individual housings 60 can be electrically contacted. From the coupling elements 94 , the electrical lines 31 already mentioned in FIG. 1 go out and are guided, inside the rail space 92 , to the described common HF generator 50 . The further electronic components 96 used to operate the devices 20 can also be arranged in this space 92 , specifically, as shown in FIG. 6, via a printed circuit board 97 on an inward-pointing inner leg 98 of the profile cover 93 . In a similar manner to the electrical line sections 76 shown in FIG. 6, by the way, the hose lines 72 described in FIG. 7 can also be connected to the profile rail 93 via associated hose connectors, not shown. In the space 92 enclosed by the rails 58 , 93 , the supply hoses 99 for cooling air, which can be seen in FIG. 6, are arranged. The supply hoses 99 lead to a source (not shown) that supplies the cooling air at one end of the double rail 58 .

Fig. 8 shows a modified embodiment in which several of the devices 20 according to the invention sit on a common tool part 100 . In the present case, this tool part 100 is a punching tool which, with its working profile 101, determines the shape with which the punched material is to be cut out of a path (not shown) by ultrasound. In the exemplary embodiment shown, the working profile 101 is a hexagon. This punching tool part 100 he sets, based on FIG. 4, the described working sections 25 of the individual combinations 20 . This application is possible because of the wide resonance curve 51 already explained in connection with FIG. 3 and the special connections between the sections according to the invention described in FIG. 5. As can be seen in FIG. 8, all the electrical lines 31 leading to the converters 21 of the individual devices 20 can therefore be connected again to a common HF generator 50 .

Instead of a cutting line, such a tool part 100 could of course also perform a weld seam between two or more tracks lying one above the other. In addition, the tool part 100 could also have any other shape and fulfill other functions. You could the tool part z. B. as an atomizer for liquids. Like. Use. In this case, the tool part 100 would be designed in the form of a plate, to which a plurality of devices 20 according to the invention are connected and, in operation, excite the plate together to produce ultrasonic vibrations. A liquid that gets onto this plate is then atomized by these vibrations. A correspondingly high vibration energy is generated on the plate or tool 100 by a larger number of devices 20 .

Reference list

10 web, wide fabric web
11 warp threads out of 10
12 weft threads out of 10
13 patterns in 10
14 interface, longitudinal section
15 strips
16 front of 10
17 back of 10
18 ' , 18 screw ( Fig. 2)
19 ' connecting bolt ( Fig. 2)
20 active part of the device according to the invention, ultrasound device, device
20 ' active part of the known device, device
21 , 21 ' transducers of 20 and 20 ', piezo element
22 , 22 ' outer axial section of 20 or 20 ', reflector
23 ′ inner axial section of 20 ′
24 , 24 ′ focusing section of 26
25 , 25 ′ working section of 26
26 , 26 ′ horns of 20 or 20 ′
27 , 27 ′ taper of 26 and 26 ′
28 , 28 ′ contacting horn end of 26, 26 ′
29 , 29 ′ cutting edge of 28, 28 ′
30 Passive part of the cutting device, anvil
31 , 31 ' electrical line to 50
32 , 32 ′ axial length of 22 or 22 ′
33 ′ axial length of 23 ′
34 , 34 ′ antinode of 37 and 37 ′
35 , 35 ′ vibration nodes of 37 and 37 ′
36 , 36 ′ axial length of 26 or 26 ′
37 , 37 ' standing wave in 20 ' ( Fig. 2) or in 20 ( Fig. 4)
38 , 38 ′ total length of 20 or 20 ′
39 , 39 ′ diameter of 20 or 20 ′
40 axial bore, ( Fig. 4)
41 thread in 24
42 other threads in 24
43 thread in 25
44 connecting bolts
45 counter pin
46 actuation end of 45
47 end of print of 45
48 pressure arrow of 45
49 immersion depth of 44 in 24
50 HF generator
51 , 51 ′ resonance curve of 20 and 20 ′
52 rails for 60 , first rail part of 58
52 ′ other rail part of 58
53 , 53 ′ steel hollow tube for 30 ( Fig. 6)
54 contact surface between 24, 25
55 width of 15 , ( Fig. 1)
56 strips at 52
57 rack on 52 or 58
58 double rail
59 radial recess in 43 , ( FIG. 5)
60 housings for 20
61 protruding hooks from 60
62 Fastening point for housing cover on 60
63 middle chamber in 60
64 seat for 20 in 60
65 spring for 20
66 Plastic ring made of PTFE
67 Silicone elastomer ring
68 outer chamber of 60
69 housing opening in 60
70 hose for cooling air
71 hose connector
72 hose feed
73 partition between 63, 68
74 electrical connection socket
75 electrical connectors at 76
76 electrical line section at 75
77 Arrow of the direction of transport of the web
78 hole
79 Axial movement arrow from 80
80 operating tool for 60
81 sprocket teeth on 80
82 locking member, gear
83 elastic link for 82
84 rotation arrow for 80
85 weaving station ( Fig. 6)
86 width of 60 ( Fig. 1)
87 heating element ( FIG. 6)
88 , 88 ′ rail outside of 52, 52 ′
89 threaded rod
90 guide for 10
91 threaded rod
92 space in 58
93 Profile cover for 58
94 electrical coupling element at 93
95 electrical connector to 76
96 electronic components in 92
97 PCB for 96
98 inner thighs to 93
99 Supply hose for cooling air in 92
100 tool part, punching tool
101 work profile of 100
102 tube filling for 53 , lead

Claims (20)

1. Device for the ultrasonic treatment of material, with at least one ultrasonic device (device 20 ') and with a device ( 20 ') electrically driving high-frequency generator (HF generator 50 ),
wherein the device ( 20 ') is divided into several longitudinal sections (sections 22 ', 23 ', 26' ) made of different material,
the sections ( 23 ', 24 ') have axial thread receptacles at the ends and are axially braced in pairs by a thread-bearing connecting bolt ( 19 ') which engages in the two threaded receptacles of two adjacent sections ( 23 ', 24 '),
and between two sections ( 22 ', 23 ') of the device ( 20 ') an electro-mechanical transducer, such as a piezo element ( 21 '), is arranged, which is connected to the RF output of the RF generator ( 50 ) ( 31 ' ) is
characterized,
that at least one section ( 24 ) of the device ( 20 ) has a continuous axial bore ( 40 ), at the bore end of which the thread receptacle ( 42 ) with the partially screwed-in connecting bolt ( 44 ) is located,
and in this thread receptacle ( 42 ), in turn, an externally threaded counter pin ( 45 ) can be screwed, its egg nes, the axial bore end (actuating end 46 ) is used for rotary actuation of the counter pin ( 45 ) around its other end (pressure end 47 ) press axially against the end of the connecting bolt ( 44 ) ( Fig. 2, 4, 5). 2. Device according to claim 1, characterized in that the immersion depth ( 49 ) of the connecting bolt ( 44 ) in the axial bore ( 40 ) is adjustable in length and the desired immersion depth ( 49 ) is fixed by the counter pin ( 45 ), ( Fig. 5th ). 3. Device according to claim 1 or 2, characterized in that the axial pressure ( 48 ) exerted by the counter pin ( 45 ) on the connecting bolt ( 44 ) is adjustable by means of an actuating tool which can be inserted through the axial bore ( 40 ). 4. The device according to one or more of claims 1 to 3, characterized in that the (44), pressure (48) zen from the lock pin (45) on the Verbindungsbol applied is aligned with the pressure prevailing in the connecting pin (44) tension, which in itself Bracing between the two associated, mutually contacting ( 54 ) sections ( 24 , 25 ) results. 5. The device according to one or more of claims 1 to 4, characterized in that in the region of the contact surface ( 54 ) between two mutually braced sections ( 24 , 25 ) at least the threaded receptacle ( 43 ) of the one section ( 25 ) has a radial recess ( 59 ) opposite the external thread of the common connecting bolt ( 44 ), ( Fig. 5). 6. The device according to claim 5, characterized in that the radial recess ( 59 ) is in the second section ( 25 ) which is adjacent with respect to the axial section ( 40 ) provided with the first section ( 24 ), ( Fig. 5) . 7. The device according to one or more of claims 1 to 6, characterized in that on one side of the electro-mechanical transducer ( 21 ) as a vibration reflector ( 22 ) of the device ( 20 ) effective end portion is arranged, the axial length is smaller / is equal to 1/8 of the sound wave length resulting from the resonance frequency (f₀) of the device ( 20 ),
while directly on the other side of the transducer ( 21 ) sits a horn ( 26 ), which on the one hand consists of a focusing section ( 24 ) for the vibrating power coming from the transducer ( 21 ) and on the other hand from a material for delivering the ultrasound to the material to be treated ( 10 ) serving working section ( 25 ),
and that the total length ( 38 ) of the device ( 20 ) from the Schwingungsreflek gate ( 22 ) to the working section ( 25 ) is less than / equal to 3/4 of the Schallwel len length, ( Fig. 4). 8. The device according to claim 7, characterized in that the total axial length ( 38 ) of the device ( 20 ) is substantially equal to half the sound wave length, while the axial length of the Schwingungsre reflector ( 22 ) approximately equal to 1/8 of this sound wave Length is. 9. The device according to claim 7 or 8, characterized in that the axial bore ( 40 ) for receiving the thread of the connecting bolt ( 44 ) and the counter pin ( 45 ) in the light alloy focus section section ( 24 ) of the horn ( 26 ) is arranged during the Working section ( 25 ) thus braced over the connecting bolt consists of steel. 10. The device according to one or more of claims 1 to 9, characterized in that a common HF generator ( 50 ) simultaneously operates the converter ( 21 ) of a plurality of independently active devices ( 20 ) ( Fig. 1, 8). 11. The device according to claim 10, characterized in that the devices ( 20 ) for ultrasonic cutting and / or ultrasonic welding of webs ( 10 ), in particular wide-webs of thread material ( 11 , 12 ), serve and on a common Rail ( 57 ) are arranged, which runs over the web ( 10 ) to be cut or welded into strips, and the devices ( 20 ), according to the desired width ( 54 ) of the strips ( 15 ), along the rail ( 57 ) are adjustable ( Fig. 1). 12. The apparatus according to claim 11, characterized in that a double rail ( 58 ) is provided, on which the devices ( 20 ) on both mutually opposite rail sides ( 88 , 88 ') and optionally arranged alternately, ( Fig. 6 ). 13. The apparatus according to claim 11 or 12, characterized in that the devices ( 20 ) is assigned a common, on the opposite web side ( 17 ) located continuous rod ( 53 ), which as a passive anvil ( 30 ) when cutting or welding the Track ( 10 ) is used ( Fig. 6). 14. The apparatus according to claim 13, characterized in that the rod consists of a hollow tube ( 53 ) which is filled with deformable material ( 102 ) of high specific weight, such as lead, ( Fig. 7). 15. The apparatus according to claim 14, characterized in that each device ( 20 ) is mounted in a housing ( 60 ) which can be clamped on the rail ( 52 ; 58 ) ( Fig. 7). 16. The apparatus according to claim 15, characterized in that the rail ( 52 ; 58 ) is provided with a longitudinal rack ( 57 ) and the housing ( 60 ) up to the rack ( 57 ) Boh tion ( 78 ) in which , for the purpose of longitudinal displacement of the housing ( 20 ), an actuating tool ( 80 ) provided with a pinion ( 81 ) can be inserted ( FIG. 7). 17. The apparatus according to claim 16, characterized in that the housing ( 20 ) has an automatically effective locking member ( 82 ) which endeavors to engage in the toothings of the rack ( 57 ), but ineffective when inserting the actuating tool ( 80 ) will, ( Fig. 7). 18. The device according to one or more of claims 1 to 17, characterized in that the device ( 20 ) or the group of devices ( 20 ) from the HF generator ( 50 ) are operated continuously. 19. The device according to one or more of claims 1 to 18, characterized in that the devices ( 20 ) instead of individual Ar beitsabschnitte ( 25 ) have a common tool part ( 100 ) and their transducers ( 21 ), mutually parallel, on a common HF -Generator ( 50 ) are connected, and that the common tool part ( 100 ) has a working profile which is never adapted to the desired course of the weld seam or weld line to be generated in the web ( Fig. 8). 20. The apparatus according to claim 19, characterized in that the common tool part as an atomizer for liquids or the like serves.