DK152030B

DK152030B - Accumulating packaged goods conveyor with exclusion station

Info

Publication number: DK152030B
Application number: DK483583A
Authority: DK
Inventors: Christian Felder
Original assignee: Gebhardt Elfriede
Priority date: 1983-10-21
Filing date: 1983-10-21
Publication date: 1988-01-25
Also published as: DK483583A; DK152030C; DK483583D0

Description

- 1 -- 1 -

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Opfindelsen angår en akkumulerende stykgodstransportør med udslusningsstation og nærmere bestemt af den i indledningen til krav 1 angivne art.The invention relates to an accumulating unit cargo conveyor with a quenching station and more particularly of the kind specified in the preamble of claim 1.

Fra tysk offentliggørelsesskrift nr. 28 53 483 kendes en akkumulerende stykgodstransportør af den omhandlede art.From German Publication No. 28 53 483 an accumulating unit freight carrier of the kind in question is known.

Ved denne transportør føres stykgodset langs godsakkumulerende transportbaner og kan udsluses til en af siderne ved særlige udslusningsstationer. Hver udslusningsstation bevirker som selvstændig teknisk enhed ikke alene en vis komplikation af det samlede anlæg men lægger også beslag på en vis delstrækning i transportøren, hvilket reducerer anlæggets godsakkumulerende kapacitet. Fra tysk GM 80 17 695 kendes et transportbåndskiftespor bestående af en for enden af et transportbånd anbragt, om en vandret akse svingbar båndstation. Båndstationen kan valgfrit anbringes i tilslutning til en øvre og nedre videreførende transportør afhængig af, hvilken vej godset skal have gennem båndskiftesporet. Båndskiftesporet er forsynet med egen drivanordning og arbejder kontinuerligt, hvilket imidlertid er uhensigtsmæssigt i forbindelse med en akkumulerende transportør af den her omhandlede art. Endvidere lægger båndskiftesporet beslag på en del af anlæggets godsakkumulerende kapacitet.At this conveyor, the cargo is transported along freight-accumulating transport paths and can be locked out to one of the sides at special lock-out stations. Each detachment station, as an independent technical unit, not only causes a certain complication of the total system but also occupies a certain part of the conveyor, which reduces the system's accumulating capacity. From German GM 80 17 695 is known a conveyor belt change track consisting of a pivotal belt station arranged at the end of a conveyor belt. The belt station can optionally be placed adjacent to an upper and lower conveyor, depending on which way the goods must travel through the belt change track. The belt change track is provided with its own drive device and operates continuously, which, however, is inappropriate in connection with an accumulating conveyor of the kind in question. Furthermore, the belt change track attaches to part of the plant's accumulating capacity.

De kendte indretninger til udslusning eller udplukning af stykgods fra en fortløbende transportør er således i teknisk henseende uhensigtsmæssige og forringer samtidig den godsakkumulerende kapacitet. Til brug i forbindelse med en akkumulerende stykgodstransportør af den her omhandlede art vil det kun være muligt at indsætte relativt få udslusningsstationer af ovennævnte årsager.Thus, the known devices for quenching or picking of piece goods from a consecutive conveyor are technically inappropriate and at the same time impair the accumulation of goods. For use in connection with an accumulating unit freight carrier of the kind in question, it will only be possible to insert relatively few quenching stations for the above reasons.

Formålet med opfindelsen er at anvise en akkumulerende stykgodstransportør med stor godsakkumulerende kapacitet og samtidig med et stort antal udslusningsstationer til godsudslusning med stor hastighed. Denne opgave løses ifølge opfindelsen ved at indrette transportøren således som angivet i den kendetegnende del af krav 1. Den akkumulerende transportør ifølge opfindelsen udmærker sig især ved at være effektivt akkumulerende i hele sin længde samtidig med, - 2 -The object of the invention is to provide an accumulating unit freight conveyor with large freight accumulating capacity and at the same time with a large number of freight extinguishing stations for high freight. This task is solved according to the invention by arranging the conveyor as stated in the characterizing part of claim 1. The accumulating conveyor according to the invention is distinguished in particular by being efficiently accumulating throughout its length at the same time as - 2 -

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at hver transportørsektion om ønsket kan indrettes som selvstændig udslusningsstation. Den godsakkumulerende kapacitet er af samme størrelsesorden som for en normal akkumulerende ! transportør, hvortil kommer muligheden for udslusning ved hvert akkumuleringssted. Udslusningsstationerne lægger ikke beslag på produktiv plads og dermed akkumuleringskapacitet. Udslusningsstationerne udmærker sig endvidere ved at kunne udføres med en meget hurtig skiftebevægelse, hvilket muliggør godstransport med normal transportørhastighed også på udslusningssektionerne. Dette forhold er også medvirkende til at give transportøren ifølge opfindelsen optimal kapacitet.that each conveyor section can be arranged as an independent quenching station if desired. The cargo accumulating capacity is of the same order of magnitude as a normal accumulating! carrier, to which is the possibility of extinction at each accumulation site. The quenching stations do not occupy productive space and thus accumulation capacity. The lock-out stations are also distinguished by being able to perform with a very fast shifting movement, which allows freight transport with normal conveyor speed also on the lock-out sections. This ratio is also instrumental in providing the conveyor of the invention with optimum capacity.

Opfindelsen skal forklares nærmere i forbindelse med tegningen, hvor fig. 1 viser en transportør ifølge opfindelsen i sidebillede, fig. 2 samme set ovenfra, fig. 3 et tværsnit langs linien III-III i fig. 2, fig. 4 en enkelt transportørsektion i udsnit i sidebillede, ! fig. 5 samme set ovenfra, fig. 6 et tværsnit langs linien VI-VI i · fig. 4, ! fig. 7 et tværsnit langs linien VII-VII iThe invention will be explained in more detail in connection with the drawing, in which fig. 1 is a side view of a conveyor according to the invention; FIG. 2 is a top plan view, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, FIG. 4 a single conveyor section in section in side view,! FIG. 5 is a top plan view; 6 is a cross-section along the line VI-VI in FIG. 4 ,! FIG. 7 is a cross section along line VII-VII i

fig. 4, IFIG. 4, I

fig. 8 en transportør i en anden udførelses- IFIG. 8 a conveyor in another embodiment

form ifølge opfindelsen i sidebillede, og Ishape according to the invention in side view, and I

fig. 9 en transportør i en tredje udførelses form i sidebillede.FIG. 9 is a side view of a conveyor of a third embodiment.

Som vist i fig. 1-3 har den akkumulerende transpor-. tør et antal efter hinanden følgende transportbånd 2, der befinder sig mellem to parallelle sidevanger 1 og 11. I stedet for transportbånd kunne transportøren i og for sig være indrettet med transportørkæder eller drevne transportørruller. Transportøren er opdelt i flere, i forlængelse af hinanden liggende sektioner 5,5',5”.As shown in FIG. 1-3 has the accumulating transport. dry a plurality of consecutive conveyor belts 2 located between two parallel side vanes 1 and 11. Instead of conveyor belts, the conveyor could in itself be provided with conveyor chains or driven conveyor rollers. The conveyor is divided into several sections, 5,5 ', 5' adjacent to each other.

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- 3 - hinanden af et fælles drivorgan 4, som i den viste udførelsesform består af en kæde, der virker via et mellemdrev 14 i hver sektion. Kæden 4 trækkes fra venstre mod højre (i fig.- 3 - each other by a common drive means 4, which in the illustrated embodiment consists of a chain acting via an intermediate drive 14 in each section. The chain 4 is pulled from left to right (in fig.

1) af en på tegningen ikke vist motor.1) of a motor not shown in the drawing.

Hver transportørsektion 5, 5'» 51' er monteret i en ramme 6, som i hver ende er forsynet med en drejeligt lejret bærerulle 7 for båndet 2. Mellem de to bæreruller 7 findes en fast båndunderstøtning 8 til optagelse af belastningen på båndet (godsvægten). Transportretningen er fra venstre mod højre som angivet med en pil 9 i fig. 1. I den mod transportretningen vendende ende er hver sektionsramme 6 svingbart hængslet til sidevangerne 1 og 1'.Each conveyor section 5, 5 '' 51 'is mounted in a frame 6 provided at each end with a pivotally mounted support roller 7 for the belt 2. Between the two support rollers 7 is a fixed belt support 8 for accommodating the load on the belt (the weight of the load). ). The direction of transport is from left to right as indicated by an arrow 9 in FIG. 1. At the end facing the conveying direction, each section frame 6 is pivotally hinged to the side vanes 1 and 1 '.

Svingaksen 10 er vandret og vinkelret på transportretningen 9. Sektionsrammen 6 kan ved svingning om aksen 10 vippes op eller ned til en skråt opadrettet eller skråt nedad-rettet transportstilling, således som antydet i fig. 1 med stiplet streg. I tilslutning til de svingbare transportør-sektioner 5, 5’, 5’’ findes tværgående fordelertransportører 11, 11*, der forløber i plan over eller under transportøren 2, og som tjener til videretransport af det ved hjælp af de svingbare transportørsektioner udslusede gods. Formålstjenligt er fordelertransportørerne 11, 11' drevne, i det mindste sektionsvis ud for hovedtransportøren 2.The pivot axis 10 is horizontal and perpendicular to the direction of transport 9. The section frame 6 can be pivoted up or down by pivoting about the axis 10 to an inclined upward or inclined downward transport position, as indicated in FIG. 1 with dotted line. Adjacent to the pivotal conveyor sections 5, 5 ', 5' 'are transverse distributor conveyors 11, 11 * which extend in plane above or below the conveyor 2 and serve to re-transport the goods extinguished by means of the pivotal conveyor sections. Conveniently, the distributor conveyors 11, 11 'are driven, at least sectionally, off the main conveyor 2.

Som det fremgår af fig. 4-7, er hver bærerulle 7 i transportørsektionerne 5, 5', 5’' anbragt på en gennemgående akseil2, der er lejret i den respektive sektionsramme 6. Akslen 12 i transportørsektionens indgangsende er forlænget ud til den ene side uden for rammen 6. Akselforlængelsen er angivet med 12’ (fig. 6). Uden for rammen på forlængelsen 121 er akslen forsynet med et tandhjul 13.As shown in FIG. 4-7, each support roller 7 in conveyor sections 5, 5 ', 5' 'is arranged on a through shaft 2 which is mounted in the respective section frame 6. The shaft 12 at the entrance end of the conveyor section is extended to one side outside the frame 6. The shaft extension is indicated by 12 '(Fig. 6). Outside the frame of the extension 121, the shaft is provided with a sprocket 13.

Et mellemdrev 14, der omfatter et tandhjul 14*, er monteret i tilslutning til rammen 6 med tandhjulet 14' i indgreb med tandhjulet 13. Tandhjulet 14’ er fast forbundet med et drivtandhjul 14'1 og er sammen med dette lejret på en fælles aksel i et hus 15. Dette hus er lejret svingbart om en vandret svingakse, der befinder sig nærmest lodret over de to tandhjuls 14'og l4fl fælles aksel. Svinglejet, der er anbragt i tilslutning til rammen 6, er angivet med 16.An intermediate gear 14 comprising a sprocket 14 * is mounted adjacent the frame 6 with the sprocket 14 'in engagement with the sprocket 13. The sprocket 14' is firmly connected to a drive sprocket 14'1 and, together with this, is mounted on a common shaft. in a housing 15. This housing is mounted pivotally about a horizontal pivot axis located almost vertically over the two sprockets 14'and l4fl joint shaft. The swing bearing, which is adjacent to frame 6, is indicated by 16.

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Ved at dreje mellemdrevet 14, dvs. huset 15 med tilhørende tandhjul 14’ og l4t!, et lille stykke i retning med uret bort fra den i fig. 4 viste drivstilling, kobles tandhjulet 14' ud af indgrebet med bærerullens tandhjul 15. Det andet tandhjul I4,ri mellemdrevet 14 er i indgreb med kæden 4 og forbliver i dette indgreb, uanset om mellemdrevet 14 befinder sig i til- eller frakoblet stilling. Tandhjulet 141’ er i den viste udførelsesform et kædehjul. Kæden 4 understøttes af en støtteprofil 17 monteret på siden af sidevangen 1 i den respektive side af transportøren.By turning the intermediate drive 14, i. the housing 15 with associated cogs 14 'and 14t, a little clockwise direction away from the one shown in FIG. 4, the pinion 14 'is disengaged from the engagement with the pinion of the carrier roller 15. The second pinion I4, in the intermediate gear 14, engages the chain 4 and remains in this engagement, regardless of whether the intermediate gear 14 is in the engaged or disengaged position. The gear 141 'in the illustrated embodiment is a sprocket. The chain 4 is supported by a support profile 17 mounted on the side of the side vane 1 in the respective side of the conveyor.

Til ind- og udkobling af mellemdrevet 14 tjener en som rulle udformet tværgående føler 18. Denne bæres af en vippearm 19 i hver side af transportøren i transportørsektionens udløbsende (fig. 7). De to vippearme 19 er monteret på et kort akselstykke 20 i hver side af rammen 6. Føleren 18 rager normalt Op i godsets transportbane men vil ved på- i virkning af godsstykket, som føres frem på transportøren, blive ! presset tilbage og nedad til den i fig. 4 med stiplet streg ; viste kontaktstilling. I denne stilling, hvor godset kan : i passere hen over føleren, er følerens 18 aksel 18’ presset ned mod et anslag 21 på sektionsrammen 6, hvorved føleren j 18 er tilstrækkelig afstøttet til at optage godsets vægt.For switching on and off of the intermediate drive 14, a transverse sensor 18 is provided as a roller. This is carried by a rocker arm 19 on each side of the conveyor at the outlet end of the conveyor section (Fig. 7). The two rocker arms 19 are mounted on a short shaft piece 20 on each side of the frame 6. The sensor 18 normally projects up into the transport path of the goods, but will be affected by the action of the goods which is advanced on the conveyor! pressed back and down to the one shown in FIG. 4 with dashed line; displayed contact position. In this position where the goods can: pass over the sensor, the shaft 18 'of the sensor 18 is pressed down against a stop 21 on the section frame 6, whereby the sensor j 18 is sufficiently supported to take up the weight of the goods.

Den af vippearmene 19, der befinder sig i samme side j af transportøren som mellemdrevet 14, er forsynet med en i nedad forlænget arm 19', -til hvis nedre ende en koblingsstang 25 er tilsluttet.Koblingsstangen 25 er i den pågældende i ende forsynet med et aflangt hul 22, igennem hvilket til- i slutningen til armen 19’ er etableret. Koblingsstangen 23 i er med sin modsatte ende 25’ ført hen til mellemdrevet 14, j hvor koblingsstangen er hængslet til den øverste ende af en ! dobbelt svingarm 24. Denne er monteret på huset 15 med j sin svingakse anbragt koaksialt med mellemdrevets tand- i hjulsaksel 14’. Den nederste ende af den dobbelte svingarm 24 er hængselagtigt forbundet med en anden koblingsstang 25, hvilken med sin modsatte ende er ført frem til den efterfølgende, i transportretningen værende transportørsektion 5, 5', 5T* til forbindelse med dennes arm 19’. Den - 5 -The one of the rocker arms 19, which is on the same side j of the conveyor as the intermediate gear 14, is provided with a downwardly extending arm 19 ', to the lower end of which a coupling bar 25 is connected. an oblong hole 22 through which at the end of the arm 19 'is established. The coupling rod 23 i, with its opposite end 25 ', is led to the intermediate gear 14, where the coupling rod is hinged to the upper end of one! double pivot arm 24. This is mounted on the housing 15 with its pivot axis positioned coaxially with the gear of the intermediate gear in the wheel shaft 14 '. The lower end of the double pivot arm 24 is hingedly connected to a second coupling rod 25 which, with its opposite end, is advanced to the subsequent conveyor section 5, 5 ', 5T * for connection with its arm 19'. The 5th -

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anden koblingsstang 25 er leddelt med et samleled 26 indsat mellem de to ledstykker. Samleleddet 26 er placeret ud for transportørsektionens svingakse 10 ophængt i en bærearm 27, der tjener som styring for samleleddet (fig. 6). Bærearmen 27 er svingbart lejret på en konsolplade 28, der tjener som bæring for vippelejet 10 i den respektive side, og som samtidig danner bro mellem sektionsrammen 6 og sidevangen 1 omkring mellemdrevet 14.second coupling rod 25 is articulated with a connecting link 26 inserted between the two linkages. The connector 26 is positioned next to the pivot section 10 of the conveyor section suspended in a support arm 27 which serves as a guide for the connector (Fig. 6). The support arm 27 is pivotally mounted on a bracket plate 28 which serves as a support for the rocker bed 10 on the respective side and which simultaneously forms a bridge between the section frame 6 and the side flange 1 around the intermediate drive 14.

Den ledagtige deling af koblingsstangen 25 er nødvendig af hensyn til transportørsektionens bevægelighed ved svingning om aksen 10 op og ned.The articulation of the coupling rod 25 is necessary for the mobility of the conveyor section when pivoting about the axis 10 up and down.

Konsolpladen 28 er udformet med en nedadrettet forlængelse 28', hvortil en cylinder 29 er tilsluttet med sin forreste ende. Cylinderen er med sin bageste ende anbragt i tilslutning til en holder 30 på undersiden af sidevangen 1 i den respektive side. Cylinderen 29 tjener til at vippe den pågældende transportørsektion op og ned.The bracket plate 28 is formed with a downwardly extending extension 28 'to which a cylinder 29 is connected at its front end. The cylinder is disposed with its rear end adjacent to a holder 30 on the underside of the side flange 1 in the respective side. The cylinder 29 serves to tilt the respective conveyor section up and down.

Hvis transportørsektionen kun skal kunne vippes enten op eller ned fra den normale vandrette stilling, vi.1 cylinderen i sig selv kunne definere de to stillinger ved passende valg af slaglængde. Hvis transportørsektionen derimod både skal kunne vippes op og ned fra den normale vandrette stilling,. kræves en arreteranordning for midterstillingen. Arreteranordningen 31 kan eksempelvis være udformet som vist i fig. 4, hvor et palformet, nedadrettet anslag 32 på konsolforlængelsen 28’ i transportørsektionens midter-stilling (dvs. den vandrette transportstilling) holdes i position mellem to kileformede klodser 33 og 33'-i Disse klodser er bevægelige op og ned mellem den viste spærrestilling og en fristilling ved hjælp af en dertil indrettet cylinder (ikke vist).If the conveyor section can only be tilted either up or down from the normal horizontal position, we.1 the cylinder itself could define the two positions by appropriate stroke choice. If, on the other hand, the conveyor section must be able to be tilted up and down from the normal horizontal position. an arranger device for the center position is required. For example, the arresting device 31 may be formed as shown in FIG. 4, where a pawl-shaped downward stop 32 on the bracket extension 28 'in the middle position of the conveyor section (i.e., the horizontal transport position) is held in position between two wedge-shaped bricks 33 and 33'. These bricks are movable up and down between the shown locking position and a release by means of a cylinder adapted thereto (not shown).

Under transportørens 2 drift sker godsophobningen (godsakkumuleringen) ved enkeltvis udkobling af transpor-tørsektionerne 5, 5’, 5M. Hvis en føler 18 presses ned under virkning af det på den respektive transportørsektion værende gods, vil dobbeltarmen 24 på mellemdrevet 14 på den foran (dvs. modsat transportretningen) værende sektion 5, 5', 5’’ blive drejet højre om, idet koblingsstangenDuring the operation of the conveyor 2, the cargo accumulation (cargo accumulation) is effected by the individual disengagement of the conveyor sections 5, 5 ', 5M. If a sensor 18 is depressed under the action of the goods on the respective conveyor section, the double arm 24 of the intermediate drive 14 on the front (i.e. opposite to the conveying direction) section 5, 5 ', 5' 'will be turned right, with the coupling rod

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- 6 - ! vippearm. Samtidig forskydes den ligeledes til vippearmen 24 koblede koblingsstang 23 mod højre, indtil det aflange hul 22 befinder sig i sin højre slutstilling. Hvis nu føleren 18 på den sidstnævnte (altså foranliggende) transpor- i tørsektion også trykkes ned, vil kob.lingsstangen 23 blive presset mod venstre. Herved tvinges hele mellemdrevet 14 til at svinge bagud, idet koblingsstangen 25 er fastlåst i j længderetningen af den førstnævnte føler 18. Ved mellem- i drevets svingbevægelse kobles den respektive transportør- j sektion ud, og det på transportøren værende gods bliver, j hvor det er.- 6 -! rocker. At the same time, the coupling rod 23 coupled to the rocker arm 24 is also displaced to the right until the elongated hole 22 is in its right end position. If now the sensor 18 on the latter (ie, in front) conveyor section is also pressed down, the coupling rod 23 will be pressed to the left. Hereby, the entire intermediate drive 14 is forced to swing backward, the coupling rod 25 being locked in the longitudinal direction of the former sensor 18. At the intermediate rotation of the drive, the respective conveyor section is switched off and the goods on the conveyor remain where it is. .

Når føleren 18 i den i transportretningen efterfølgende transportørsektion frigives, vil dennes mellemdrev 14 under virkning af kædetrækket 4 blive trukket ned i indkoblet position igen, og transportørsektionen begynder at arbejde.When the sensor 18 in the conveyor section following in the conveying direction is released, its intermediate drive 14, under the action of the chain pull 4, is pulled back into the switched-on position and the conveyor section begins to work.

Det på transportøren værende gods føres videre frem i transportretningen.The goods on the carrier are carried forward in the direction of transport.

Ud for hver transportørsektion 5> 5!, 5tf er anbragt en læsestation 35 til automatisk aflæsning af den på hvert godsstykke værende kode. Aflæsningen skal kunne foregå uanset transportørstillingen. Læsestationerne 35 styrer udslusningsforløbet ved passende indstilling af sektionerne. Hver transportørsektion 5, 5’, 5M er ved udløbsenden forsynet med en lysbro 34 til overvågning af gods- j passagen og til hurtig nyindstilling efter hver passage. \Next to each conveyor section 5> 5! 5tf is a reading station 35 for automatically reading the code on each piece of goods. The reading must be possible regardless of the position of the conveyor. The read stations 35 control the run-out process by appropriately adjusting the sections. Each conveyor section 5, 5 ', 5M is provided at the outlet end with a light bridge 34 for monitoring the cargo passage and for rapid resetting after each passage. \

Derved muliggøres den størst mulige transporthastighed. IThis enables the highest possible transport speed. IN

I en udførelsesform som vist i fig. 8 er transportø- j ren forsynet med transportørkæder 2’, der understøttes af profillister 8. I fig. 9 er transportøren vist i en udførelsesform med transportørruller 2’’. Disse drives af en fælles kæde eller drivrem via mellemdrevet 14.In one embodiment as shown in FIG. 8, the carrier is provided with conveyor chains 2 'supported by profile moldings 8. In FIG. 9, the conveyor is shown in an embodiment with conveyor rollers 2 ''. These are driven by a common chain or drive belt via the intermediate drive 14.

Claims

An accumulating unit load conveyor having one or more lock-out stations and of the type consisting of a sectioned conveyor, each section (5.5 ', 5 ") having a unit load supporting and moving conveyor (2.2', 2"), which is driven by an intermediate drive (14) driven by a constantly rotating propellant (4), which can be switched from a driving position to a free-running position by means of a sensor (18) projecting into the movement path of the piece goods, characterized in that: as a quenching station, a conveyor section (5.5 ', 5 ") stored in a pivotal section frame (6) is used, the pivot axis (10) of the section frame extending transversely of the conveyor plane and parallel to the conveyor plane and which section frame (6) thereof means are pivotable to an inclined position in which the position of the associated conveyor section opens into an associated elevated conveyor (11,11 '), the drive connection via the intermediate drive (14) between the conveyor section of the section e (2,2 ', 2 ") and said propellant (4) are arranged so as to be maintained or establishable regardless of the position of the section frame (6).

An accumulating unit load conveyor according to claim 1, characterized in that the intermediate drive (14) corresponding to a pivotable section frame (6) is coaxially or approximately coaxially with the pivot axis (10) of the respective section frame.

Accumulating piece goods conveyor according to claim 1 or 2, characterized in that the sensor (18) is carried by rocker arms (19) mounted at the free end of the conveyor section (5.5 ', 5 ") on the associated section frame (6). and articulated with one end of a coupling rod (23), the other end of the coupling rod (23) being articulated down one end of a double pivot arm (24) pivotally mounted coaxially with said section. '5') intermediate drive (14) on its housing (15), and the other end of the double swing arm (24) is articulated with another coupling stance (25), which communicates with the intermediate drive (14) in the forward conveyor section (5.5 ', 5 ") in the direction of transport (9), said second coupling rod (25) being provided with a link (26) which is in extension of the pivot axis (10) and is connected to a holding arm (27) hinged on the section frame (6).

An accumulating unit load conveyor according to claims 1-3, characterized in that the roller (18) in its actuated, pressurized position j rests on a stop (21) fixedly mounted on the section frame (18). 6). 4 i i i