DE1924061B2 - DEVICE FOR AREAS WELDING OF PARTIALLY OVERLAPPING STRIPS MADE OF THERMOPLASTIC MATERIAL USING FRICTIONAL HEAT - Google Patents

Description

The invention relates to a device / around areas Overlapping of partially overlapping Tapes made of thermoplastic material by means of frictional heat, especially in the case of the l'mreifuiiü of packages, with a clamping device having (round body. of the to be connected Bandberciche / wipe absorbing Carries friction jaws, with at least one row jaw taking along the bami section lying against it is veiMCt / har is veiMCt / har when maintaining a contact pressure in a rapid to and fro movement. at dicsei! known devices takes place back and forth Movement of the friction jaw and of the band blade attached to it in the longitudinal direction of the band. By this back and forth movement of the hand section resting on the row hoe in the longitudinal direction read tape is used to wipe / wipe the tensioning device and the row hoe extending band areac uelänül. causing permanent deformation in the Bandi cut and thus a reduction in the Belt strength.

The invention is due to Aulgahc / ugiunde. one Device animal type explained at the beginning / u shadow, no reduction in hand strength occurs in tier.

i>i;'si s / κ 1 wild erlinduniisgcni.ii ■ d.idureli en ¹ ei a. dal'i the row cheeks t | tier / ui I an ^ ci sn eckung a lot • ■ '.eh imct lapping 1 iandhci eu In ¹ rclaliv / ueinaiulei i \ - \\ ..- L'hai Mini when going back and forth q'.ici

Ii-i; :: i> jser ^ 'ii cckuiii: iler siel, uhci lapping tape '■,!. ■ ulic Helen only very scringe I angenantleningen Jk

RcllcI iiiiK

elasiischeii Vcr-

: ties Baiitles iie ^ en. I never permanent oucrei'li'i'inung ties to the length of the B.uules wiitl ilatluich avoided.

\ otleilhall is the cmc t | uer / u which overlap ntl en Bandhereich announced back and forth .. ■ -.Mim ' iliiivh / iilühicndc hoe shifting shark on one mounted in the direction of the counter jaw displaceable punch. This ensures that only a few Parts must perform the reciprocating movement while the required pressure of the Friction jaw takes place in the direction of the counter jaw via a stamp.

Advantageously, the displaceable friction jaw has an extension with a recess on, in which one arm of a two-armed lever pivotably held on the base body engages, the other of which Arm in a fork-shaped end an eccentric part parallel to the longitudinal direction of the belt extending drive axis detected. This achieves that the rotary movement of the drive axle in a simple manner via the eccentric part and the two-armed Lever is transformed into a reciprocating movement of the friction shoe. The lengths of the and moving movements can be done in a simpler way Way by the eccentricity of the eccentric part and the lever ratio of the two-armed lever varies will.

Appropriately, the fork-shaped linden tree of the lever arm detects a bushing with a needle bearing on the eccentric part of the .drive axle aulgeset / l is. This eases the friction / wipe the fork-shaped end of the two-armed Lever and the fixed center part lowered.

The ram pressing the displaceable friction jaw in the direction of the opposing jaw is expediently positioned under the action of a spring-loaded lever, animal is striving. Transfer the stamp and with it the hoe to the l'i '.' ßsiellung / u. This achieves that the punch and thus the friction jaw is held in a force-locking manner in their l'iessstcllung.

The Andriiekhebcl, which is pivotably mounted on the base body, has an advantageous effect with a short lever arm on a backward extension of the stamp. while the other lever arm is dimensioned longer and a recess / around partial engagement Has helical compression spring, which is with her other Lntle in one into a cover plate for the Punch guide provided recess Thereby it is achieved that with a feather, animals Ietleikralt is relatively weak. a great pressure the friction shoe is achieved.

Advantageously, the one on the Siempt acting lever a pawl pivotally mounted which is located in the release seal of the stamp put on a shoulder smoothed out by a protrusion This achieves that animal, Andrückhebe! with tlaniii tier stamp and the grater in their 1st iciga production is airetable. In this position you can the belt / wipe animal friction jaw and the counter heel are inserted

In / wake-like way, the grater is notched tlei effect of a relatively weak Feiler, the hey sii eht i-i. tli. kcibhacke and with it the stamp the lcsisei / 'viruses Andrückhcbcl / u hold Da'durcl w irtl cm. iehts. that this Fcdci the grater and de Stamp üciicn ilen lcslücsci / tcn Andrückhebe press! so that the Häiulci / wischen Rcihhaekc mn (tcgcii <ackc introduced to graze.

/ wccknuißisi is the gelageri at AndrücUiehel The pawl only has an η Nas provided on a lever liftable. Datlureh can tli in cinlachcr manner jack, msgehohen so that tier Audrückhchi the stamp uiul the Reibbaekc 111 line effective ubei lüht

Advantageously, the one that drives the friction hook Drive axle at the same time to a tensioning wheel of the tensioning device via a worm and a worm wheel. It is thereby achieved that the torque acting on the drive axle at the same time also the tensioning wheel the tensioning device tin tensioning the strapping tape drives.

According to a further proposal of the invention, the clamping device can when a predeterminable The belt tension is automatically decoupled from the drive axle and that on the pressure lever Move the pawl in the release position. This ensures that when a Predeterminable tape tension a further tensioning of the strapping set and the friction jaw is transferred into their active position, whereby the welding process is initiated.

Appropriately, when the predetermined belt tension is reached, a with the drive axle of the The friction jaw coupled, the screw having the axis part move in the longitudinal direction, and so that the friction jaws decouple from the drive shaft and lift the pawl with the nose Operate the lever. This makes it easy to disengage the clamping device and the in Bringing the active position of the friction jaw a longitudinal displacement of the anyway having an axial component Worm gear used.

The shaft part having the worm advantageously has a coupling part at one end with several radially outwardly protruding projections. those in the engaged position against The coupling pins are in contact and in the uncoupled position in the recesses of the coupling pins without contact are arranged. This ensures that in the coupled position of the screw having axle part are rotatably connected to the drive axle, while in the uncoupled Position the further rotating drive axle with the coupling pin and the outwardly protruding projections of the coupling part in recesses without contact.

The coupling pins are advantageously one from the free ends of planetary gear axles the drive axis of the friction jaw provided PIanetcnradgctriebes educated. As a result, the coupling pins are already present in a simple manner Planetary gear axles are used, with the planetary gear transmission at the same time being a large reduction is achieved.

Expediently, the axis part having the worm has a circumferential annular groove. in which the lever actuating the pawl with a nose engages with a cam provided on its axis. It is thereby achieved in a simple manner that by the displacement of the screw having Axis part at the same time a release of the pawl takes place, so that the friction jaw moves into its operative position will.

Appropriately, on the axisicil having the worm, a protected one for the worm wheel is provided Pushed on the bushing, which is at one end against the axial bearing of the axle part and at the other end against the Supported cam of the ratchet release lever. This ensures that the pivoting of the cam having axis takes place via the bushing, which is supported against the thrust bearing required anyway.

Advantageously, a spring counteracts the lifting action on the pawl. those with an adjustable Pretensioning force is loaded. This ensures that the pawl automatically returns to its operative position and with the adjustable preload the desired band span can be set.

In an advantageous manner, the preloading spring is designed as a screw-type pressure spring and is arranged in the interior of the hollow pawl release lever, with one spring end aiii one protruding from the pawl. in uiiw hollow Klinkenausiückhcbel protruding arm acts. As a result, the spring is arranged in a simple manner in an already existing pawl release lever, so that further means for holding the spring are dispensable.

Appropriately acts on the other end of the spring a threaded pin. into a threaded hole in the free face of the ratchet release lever is retracted and locked with a screw button. The preload is thereby in a simple manner adjustable by the helical compression spring, whereby the threaded pin that adjusts the preload is not can unintentionally loosen.

The part of the pawl from cooperating with the nose of the pawl release lever is expedient formed a pivot part held in its operative position by a spring. It is thereby achieved that the latch release hook having the nose can be converted into its operative position, even if the pawl is already in its locked position.

The tensioning device is advantageously a spring-loaded one Release lever assigned with the one hand, the counter jaw for the tensioning wheel in a release position and on the other hand the pressure lever for the stamp can be moved into the fixed position. Through this is achieved in a simple manner that after welding the collar areas by actuation the release lever pulls the tape out of the tensioning device and can be removed from the welding device.

The extinguishing lever advantageously acts with a laterally mounted roller with an inclined surface of the pressure lever together. This ensures that when the release lever is actuated leather-loaded pressure lever in its release position transferred and can be held in this position with the pawl.

Conveniently, the drive shaft for the friction jaw is from a motor, preferably one high-speed air motor driven. This ensures that a particularly fast return and reciprocation of the friction shoe is achieved so that the temperature required for welding is very high will soon be achieved.

A knife for cutting the tape can expediently be attached to the friction jaw, which can be moved back and forth be held. This makes the back and forth movement of the friction jaw to the Cut of the tape used up.

In the drawing, the invention is explained in more detail using an exemplary embodiment, namely showing:

1 shows a welding device in side view, partially canceled.

F i g. 2 shows a detail of FIG. 1. partially in section. 3 shows that in FIG. 2 shown detail dei Device in another position,

F i e. 4 shows a section along the line IV-IV of FIG . Ί.

F i g. 5 shows a section along the line V-V dei F i c. 1. partially broken for weeks.

7 ^ 8

6 shows a section along the line VI-VI of the stem guide 29 and the cover plate 30.

F i ii. S. is seen. The pressure lever 31 and thus the

Fig. 7 shows a section along the line VII-VII of the punch 26 and the friction jaw 15 is thus in the

Fir. I and release position can be locked.

Fig. 5 shows an end view of the coupling part. 5 The pawl 40 is provided with a pawl release lever.

The device shown in the drawings can be lifted out at 43 via a nose 44. How mshesonvvird driven by a compressed air motor K). The other from FIG. I can be seen, can sunbathe at ei-axis of rotation 11 of the compressed air motor 10 runs no pivoting of the pawl release lever 43 in FIG parallel to that to be connected to the device. Counterclockwise direction pawl 40 band not shown in detail. The compressed air motor 10 lifted. The pawl 40 reaching under gate 10 is via a gear part 12 on the base body nose 44 is formed by a stamped part that with flanged by 13 of the device. The main body two screws 45 and 46 adjustable on the Klinpcr 13 has a Gegenbackc 14 for a Reibhak- kenausrückhebe! 43 is held. ke 15, between which the partially overlap- As already mentioned, the air motor is small pending tapes for welding in areas 15 gear part 12 connected downstream. This gear arranged will. The counter jaw 14 is part 12 is designed as a planetary gear, under the partially overlapping bands, while the planetary gear axles 47 also serve as rend the friction shoe 15 is arranged above it. The coupling pin for a coupling part 48. the one on egg friction shoe 15 is. as in particular from FIG. 4 no downstream axle part 49 is provided. can be seen, transversely to the longitudinal direction of the straps sliding. For this purpose, the friction jaw 15 is provided with a ver. S can be seen with six radially outward Longer 16 provided, which provided a recess 17 protruding protrusions 50 that entered the. In this recess 17 an arm 18 engages a coupled position against that of the planetary rail Base body 13 pivotably supported coupling pins formed by zvveiar- daehse rest. F.inigen Lever 19. whose other Ann 21 learns from the free ends are the coupling pins fork-shaped hands 22 a Hxzentteil 20 fen 47 provided with recesses 51 in which the the radially outwardly projecting projections 50 of the cup that run parallel to the longitudinal direction of the band Drive axle 11 detected. The eccentric part 20 of the lungsleiles 48 in the uncoupled position of the drive shaft 11 is arranged with one on a needling-free. In the uncoupled stellar 23 mounted bush 24 provided so that the 30 ment can thus the planetary gear axles 47 to Friction is relatively small. Turn the coupling part 48 over the Hxzen- without touching it 20 and the two-armed lever 19 is thus men. It is therefore there to disengage the clutch Friction shoe 15 when rotating the drive axle 11 coupling part 48 and the axle part 49 in a longitudinal row reciprocating motion imposed. to move. This is done on the rotatable gela

The friction jaw 15 lies under the interposition of 35 gerten axle part 49, the worm 52 of a worm

\ on rollers 25 placed against the underside of a stamp 26 kenradgetriebes in such a way that during operation

at. The grating hoe 15 is in this case with one of the gears on which the worm 52 has

Underside of the base body inserted spring 27 in Achsenteii 49 a component m Ahm ιίιΛ · κπίαημ

System held, the spring at the same time the friction of the clutch 47, 48 acts.

jaw 15 and the punch 26 in the release position 40. The worm 52 of the worm gear mechanism acts

convicted. on a worm wheel 51. aut whose axis 54 a

The punch 26 has a rearward demand tensioning wheel 55 of a tensioning device 56 in a rotationally fixed manner 28 on which is held down in a vertical guide 29. The tensioning device 56 is used to keep it slidable. The forwardly open new one around a package or the like. Laying guide 29 of the punch extension 28 is 45 fungsbandes. The tensioning wheel 55 is one by one closed by a cover plate 30. Opposite parts pivotably mounted on the screw pin 57 Hands of the punch extension 28 acts a jaw 58 associated with the lower Ban pressure lever 31 a. The pressure lever 31 is held by the end. The pivotable counter hook Screw pin 32 pivotally supported and ke 58 stone with the help of one to the has a short arm 33, which is arranged at a screw pin 57, not closer to pivoting of the pressure lever 31 into the position shown in FIG. provided leg spring, the legs of which are against The active position shown in FIG. 3 support the ram 26 and the pins 59 and 60. The pivotable gemit the friction jaw 15 transferred into the operative position, the supported counter jaw 58 is thus frictionally engaged in ih-Der Pressure lever 31 has a somewhat longer active position held rer. On the swiveling gela Arm 34 up. in which a recess 35 for a 55 whipped counter-jaw 58 is a pivotably mounted egg Helical compression spring 36 is present. This tape holder 61 is stored, dei with one in the working position Since then, helical compression spring 36 has supported the band with its downwardly projecting nose 62 Ren end in a recess 37 of the cover plate holds. The tape holder 61 is with an upward ra te 30 from. The pressure lever 31 thus strives. ing pin provided in a recess 6-through the spring 36 protrudes its 60 shown in FIG. Thereby, the tape holder 61 is he To take active position. Transferring the counter-hoe 58 into your Frcigahestel

IX · i central pressure lever 31 has a third arm 38 '!' Ng ehent;: iK ir. Their free division transferred.

on. on which a bearing pin 39 is provided. On the pivotable counter jaw 58 is a abge

this journal 39 is. as in particular from the Winkeleltei release lever 65 attached. By actuator

1, a pawl 40 pivotably loaded 65 of this release lever 65 is the counter-jaw 58 de

gert. In the release position, the pawl 40 acts over the tensioning device 56 in its release position

speaking of FIG. 2 with one, can be presented by one. On the release lever 65 is a side ge

jump 41 formed shoulder 42 together, which is provided on supported roller 66, which with a Schanschfiä

clic 67 around .Arm 38 of the Andriickhebcls 31 cooperates. When the release lever 65 is actuated is thus the Andrüekhebcl 31 in its release position convicted. When actuating the release lever 65, the (iegenbackc 58 of the Clamping device 56 but also the row hoe 15 is transferred into its free hinge, so that the \ oirrichtung \ on the tape. When pressed of the release lever 65, another tape holder 68 is transferred into its release position at the same time. the one with the lower edge of the extinguishing lever 65 in Active connection occurs. The tape holder 68 is on the dome of the friction jaw 15 facing linden of the device in a vertical direction on a screw pin 69 \ appeared to be mounted, the one in a horizontally leading Arm 70 has a recess 71 for the band. The screw / apfen 69 engages through it tin 1.angloch 72. which has a lateral recess 73 for a spring 74. This leather 74 strives to to hold the tape holder in the operative position.

As already mentioned, the uncoupling of the axle part 49 driving the tensioning device 56 takes place by a longitudinal displacement of the screw 52 having axis part 49. The axis part 49 having the worm 52 is in this case by a spring force held in the coupled position, so that the displacement and thus the uncoupling of the axle part 49 only takes place after the adjustable spring force has been exceeded. The one having the screw 52 Axis part 49 has a circumferential annular groove 75 for this purpose. in which the pawl 40 with a nose 44 actuating Klinkenausrückhehel 43 engages with a cam 77 provided on its axis 76.

On the axle part 49 having the worm 52 there is one slotted for the worm wheel 53 Bushing 78 pushed on, which is at one end against the axial bearing 79 of the axle part 49 and at the other end seven the cam 77 of the ratchet release ! bc! s43 abCtüt / i. This will make the shift of the Axle part 49 and the axial bearing 79 directly on the cam 77 of the ratchet release lever 43 transfer. When moving the snail 52 having the axis part 49 is thus at the same time the axis 76 of the ratchet release lever via the cam 77 43 pivoted, in the sense of a

The Ku'iike 40 has to be lifted out. However, the handle 40 is stone under the action of a screw regulator 80. the inside of the hollow pawl release lever 43 is arranged. The helical compression spring 80 is supported with one of its finds against one the pawl 40 provided in the hollow Klinkenausrückhehel 43 protruding arm 81 from. A Uewinuezapfen 82 acts on the other end of the fat. which in a (iewindeloch 83 in the free face of the

ίο retracted latch release lever and with a Screw button 84 is countered. With this helical compression spring 80, the preload can be adjusted. the pawl 40 is thus held in its locking position, Only after the force holding the latch in its locking position is exceeded is pivoting of the ratchet release lever 43 possible. With the adjustable preload the very rough pressure spring 80 can thus be adjusted the clamping force of the clamping device 56, since the spring force dei Helical compression spring 80 also holds the axle part 49 having the worm 52 in the operative position will. If the adjustable clamping force of the clamping device 46 is exceeded, it shifts thus the axle part 49 having the worm 52 thus couples the drive of the tensioning device and lifts the pawl 40 off. so that the friction jaw 15 is transferred into its operative position. At the When the desired belt tension is reached, the tensioning of the belt is adjusted and the grater is used 15 a reciprocating motion is imposed on the overhead tape end, so that the au ^ thermoplastic existing straps are rubbed against each other, thereby eliminating heat, which is sufficient to at least soften the surfaces of the tapes lying on top of one another and with one another to weld.

A knife 85 is held on the friction jaw 15, which is movable to and fro, which during the to-and-fro movement the friction jaw 15 acts at the same time on the overhead tape end and rubs through.

As already mentioned, the version shown is just one example of the realization of the invention and not limited to this. Rather, there are still many other designs and variations MÖL'Ii

In addition 6 sheets of drawings

Claims (1)

Patent claims: 1. Device for the welding of partially overlapping strips in areas made of thermoplastic material by means of frictional heat, especially when wrapping Packing pieces, with a base body having a clamping device, which is to be connected Belt areas between them receiving friction jaws, with at least one friction jaw while taking along the section of tape resting against it while maintaining contact pressure can be set in a rapid reciprocating motion. thus g e k e η η ζ e i c h n c t. that the friction jaws are transverse to the longitudinal extent of the overlapping belt areas relative are movable to each other. 2. Device according to claim I, characterized in that that the one back and forth running across the overlapping band Friction jaw carrying out the back movement is displaceable on one in the direction of the counter jaw slidable stamp is mounted. 3. Apparatus according to claim 1 or 2, characterized in that the displaceable friction jaw has an extension with a recess into which one arm of a two-armed lever pivotably mounted on the base body engages, the other arm of which with a fork-shaped i ^: nde a H / ent part a drive axis running parallel to the longitudinal direction of the belt. 4. Apparatus according to claim 3, characterized in that that the fork-shaped linden of the lever arm detects a socket with a needle bearing placed on the eccentric part of the drive axle is. 5. Device according to one of claims I to 4, characterized in that the slidable tier Friction jaw in the direction of the opposing jaw pressing the punch under the action of a single force loaded lever stands, which strives. the Transfer the punch and thus the friction jaw to the pressing position / u. Cv device according to claim 5, characterized in that that the pressure lever, which is pivotably mounted on the girdle body, has a short Lever arm on cmc guttural extension of the Stamp cinvv ii kl. wall rc ml the other 11 ehe I arm lengthi measured isi iiiul cmc recess for partly I ιΠ ': ιίΙΙ eini screwcndi uckledcr aiiiweis !, the Mi h mil ihi \ m allies end in one Cover plate seen in the Slempelliihi uiiii voi Supports recess. ^Ί . Attention after a dci \ nspruche I to ii. dadiiicli .vkcnn / eichncl. dal.l on that; nt the Su inpel euiw π keiuieii lever a pawl μ. hweiikb.ü Lvliuril isi. the in del I rciüab.-siclhtnu de- stamp see geticn one of a pre \ [inmi! L'cbildclcii shoes anlcul. S. Viii ι leliluiiL'naeh one of the .- \ nspi üche I bis. dadiiich ¹ JcI-.cnnzcK ¹ IiIH-I. dall the Reibbat, ke iinlei dei Wiil-iuiL ¹ eiiit. ι lelaliv weak leather -Iehl. die be · -11 ebi im. the friction shoe ι mti thus the Sieinpel> ei.! s ilen I ¹ -Ketzbarcn Aiuli uckhebcl to echo. '' \ οι nehtiiim nai Ii a dci claims I bis 35 40 55 8. characterized in that the on the pressure lever mounted pawl can be lifted out with a nose provided on a lever. 10. Device according to one of claims 1 to K), characterized in that the Friction jaw driving drive shaft at the same time via a worm and a worm wheel The tensioning wheel drives the tensioning device. 1 1st device; especially after one of the Claims 1 to 10, characterized in that the clamping device on reaching a predeterminable The belt tension is automatically decoupled from the drive axle and that on the pressure lever Moved pawl or locking device into the release position. 12. The device according to claim 11, characterized characterized in that when the predetermined belt tension is reached, one with the drive axle the friction jaw coupled, the screw having the axis part extends in the longitudinal direction moves, thereby decoupling from the drive axis of the friction jaw and the pawl with the Lever levering out the nose operated. 13. Vorrichtuiiii according to claim 12. characterized characterized in that the shaft part which has the screw has a coupling part at one end having a plurality of radially outwardly projecting projections in the engaged Stcllurm rest against the coupling pin and in the uncoupled position in the recesses Coupling pins are arranged without contact. 14. The device according to claim 13, thereby eekennzeiehiiet. that the Kupplimgszaplen of the free ends of planetary gear shafts of a planetary gear unit provided on the drive axle of the friction shoe are formed. 15. Device according to one of claims 11 to 14, characterized in that the the tendon having the axis part has a circumferential annular groove in which the pawl with a nose actuating lever engages with a cam provided on its axis. Id. Device according to one of the claims II to 15. characterized in that aul A bushing slotted for the worm wheel is pushed onto the axle part having the worm is. They always see against this Achsiallauei of the axle part and one end against the cam of the Klinken.uisi ückhebels. 17. Device according to one of the claims Il to liv characterized in that aiii the handle is made of leather against the lever acts, the preamble π kra It is burdened. IS. \ ori'ichtuni; according to claim 17 thereby marked that the Vorspaiinl'edcr as Schi aiibenih uekledei trained and imieicn the hollow Klinkciiaiisi üekhebels is arranged. w (ibt ι da-, an I cd ei end aiii a .ii! ι Ie ι latches voi'jeschcncn m the hollow Kliukcnausriickhc-IvI luneini grazing \ rm cmwitkl I ¹ '\ oMichliiiK' nach \ iispiiith! "Oiler IS. D.iiliiieh i'.ckciiMzcichncM. That on! The other one acts in <lewiiulezaplen, dei in one (iewindcloi I; in the free Siirnll icho of the latch lever with a sel'iaubcnbnopl! . ":( i. Device according to one of the claims <f before 1 to 19, characterized in that the ^{part of the pawl which cooperates with the nose of the latch release lever 1 is} formed by a pivoting part held in its operative position by a spring. 21. Device according to one of claims 1 to 20, characterized in that the Clamping device is assigned a spring-loaded release lever. with the Geüenbacke on the one hand for the tensioning wheel in a FrcigabestelTung and on the other hand the pressure lever for the stamp can be transferred to the fixed position. 22. The device according to claim 21. characterized ^ indicates that the Auslösehebcl with a laterally mounted roll with a bevel ties Aiuirrückhebels cooperates. 23. Device according to one of claims 1 to 22, characterized in that the drive axle for the friction jaw of a motor, preferably a high-speed DiucklufciTiotor is driven. 24. Device according to one of claims 1 to 23, characterized in that on the In and forwards movable friction jaw a knife / to cut off the tape is held. 25 ü