DK158817B

DK158817B - forage harvesters

Info

Publication number: DK158817B
Application number: DK203782A
Authority: DK
Inventors: Jean-Paul Berthet
Original assignee: Deere John Cie Francaise
Priority date: 1981-05-06
Filing date: 1982-05-06
Publication date: 1990-07-23
Also published as: EP0064114A1; ES511933A0; DK158817C; EP0064114B1; ZA823119B; ATE10413T1; ES8303881A1; DE3167409D1; DE64114T1; DK203782A

Abstract

1. A reaping-conditioning machine of the type comprising a cutting bar (4) above and towards the rearward part of which is disposed a rotor (8) provided with teeth or fingers (11), rotating about a horizontal axis which is transverse with respect to the direction of forward movement of the machine, and combined with a conditioning hood (12) which is held only at its front and rear transverse edges, the hood surrounding a portion of the circumference of the rotor (8) to guide the crop products which are picked up by the rotor after they have left the cutting bar, to cause them to pass above the rotor for them to be projected on to the ground in the form of a windrow to the rear of the machine, the hood (12) being adjustable by way of its mounting points in such a way that one or both transverse edges can be displaced with respect to the periphery of the rotor, characterised in that the hood (12) which is of resiliently deformable sheet metal is held at at least one of its transverse edges by a rapid adjusting means comprising an eccentric (15) which is pivotally mounted on at least a fixed portion of the machine and which is positively connected to said transverse edge of the hood and the angular position of which is adjustable in order to modify the profile of the conditioning hood by resilient deformation of the sheet metal, and thus the position of the hood with respect to the rotor (8).

Description

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iin

Opfindelsen angår en grønthøster af den art, der benyttes til af steering og kondi tioner ing af høstmaterialer, såsom græs eller grøntfoder.The invention relates to a green harvester of the kind used for the steering and conditioning of harvesting materials, such as grass or green fodder.

5 De kendte grønthøstere omfatter i almindelighed et chassis, der er beregnet til at blive sammenkoblet med en traktor, og på hvilket der er monteret en knivbjælke, som kan være af sværdtypen, men som ofte i de moderne grøntsnittere er af en art, der omfatter et vist antal skiver eller topfræsere, 10 som drejer rundt parvis i modsatte retninger for at afskære høstmaterialerne ved roden. I en kendt maskintype er der oven over denne knivbjælke hen imod dens bageste del monteret en konditioneringsrotor, som består af tænder eller fingre eller lignende elementer, som er monteret på en aksel, der er orien-15 teret på tværs af maskinens fremføringsretning, hvilken rotor er kombineret med en konditioneringsskærm, som har som funktion at lede de afskårne høstmaterialer under deres konditio-nering ved at foranledige deres passage bagud oven over rotoren og ved hjælp af rotoren sikre deres udkastning bagud fra 20 grønthøsteren for at danne en skår.The known green harvesters generally comprise a chassis intended to be coupled to a tractor and on which is mounted a blade bar which may be of the sword type, but which is often in the modern lawnmower of a kind comprising a certain number of washers or top cutters 10 rotating in pairs in opposite directions to cut the harvesting materials at the root. In a known machine type, a conditioning rotor is mounted above this knife bar towards its rear part which consists of teeth or fingers or similar elements mounted on a shaft oriented transversely of the direction of feed of the machine, which rotor is combined with a conditioning screen which functions to guide the cut harvest materials during their conditioning by causing their passage backwards above the rotor and by means of the rotor securing their ejection backwards from the green harvester to form a notch.

Man ved, at for at opnå en egnet konditionering af materialerne er det nødvendigt at kunne regulere stillingen af konditio-neringsskærmen i forhold til spidserne af tænderne eller fingre-25 ne på rotoren efter forholdene, især efter høstmaterialernes fugtighedsgrad og deres art. Man har til det formål i den tidligere teknik foreslået forskellige løsninger til reguleringen af skærmen. En regulerbar skærm af den art er beskrevet f.eks. i det franske patent nr. FR-A-2408992.It is known that in order to obtain a suitable conditioning of the materials it is necessary to be able to regulate the position of the conditioning screen relative to the tips of the teeth or fingers of the rotor according to the conditions, especially according to the moisture content of the harvesting materials and their nature. For this purpose, in the prior art various solutions have been proposed for the regulation of the screen. An adjustable screen of this kind is described e.g. in French Patent No. FR-A-2408992.

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Formålet med opfindelsen er at anvise en grønthøster, der er forsynet med en konditioneringsskærm, som er indrettet på en sådan måde, at den ved hjælp af særligt enkle midler muliggør en hurtig regulering af denne skærm i forhold til 35 rotoren.The object of the invention is to provide a green harvester which is provided with a conditioning screen which is arranged in such a way that it enables, by means of particularly simple means, a quick control of this screen relative to the rotor.

Opfindelsen er realiseret i en grønthøster af den art, derThe invention is realized in a green harvester of the kind that

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2 bærer en knivbjælke forneden, og hvor der hen imod den bageste del af denne er anbragt en rotor, som er forsynet med tænder eller fingre, og som drejer omkring en vandret akse, der står på tværs af maskinens fremføringsretning, hvilken rotor er 5 kombineret med en konditioneringsskærm, som alene er fast holdt ved sine tværgående for- og bagkanter, og som omringer en del af rotorens omkreds med henblik på at lede det høstmateriale, der af rotoren føres bagud, efter at det har forladt knivbjælken, for at tvinge det til at passere oven over 10 rotoren med henblik på dets udkastning i en skår på jorden bag ved maskinen, og hvor skærmen kan indstilles således ved sine fastholdelsessteder, at den ene eller de to tværstillede kanter kan forskydes i forhold til rotorens periferi, hvilken grønthøster er ejendommelig ved, at konditioneringsskærmen, 15 som er en elastisk deformerbar stålplade, ved i det mindste én af sine tværstillede kanter er fastholdt af en hurtigt virkende reguleringsmekanisme, som består af en krumtap, der er ledforbundet med mindst én fast del af maskinen og forbundet direkte til den nævnte tværstillede kant af skærmen,, og 20 hvis vinkelstilling kan reguleres ved, at man ved en elastisk deformering af stålpladen ændrer konditioneringsskærmens profil og derved dens stilling i forhold til rotoren.2 carries a cutter bar at the bottom and where towards the rear part of it is arranged a rotor, which is provided with teeth or fingers, which rotates about a horizontal axis which is transverse to the direction of feed of the machine, which rotor is combined with a conditioning shield, which is held only at its transverse front and rear edges, and which surrounds a portion of the rotor's circumference to guide the harvesting material carried by the rotor after leaving the cutter bar to force it for passing above the rotor for its ejection into a notch on the ground behind the machine, and wherein the screen can be adjusted at its holding locations so that one or the two transverse edges can be displaced relative to the periphery of the rotor, which is a green harvester peculiar in that the conditioning screen 15, which is an elastically deformable steel plate, is retained at least one of its transverse edges by a fast acting regulating mechanism, which consists of a crank jointed with at least one fixed part of the machine and connected directly to said transverse edge of the screen, and whose angular position can be controlled by changing the profile of the conditioning screen by an elastic deformation of the steel plate and thereby its position relative to the rotor.

De udførte forsøg har vist, at det var tilstrækkeligt at an-25 bringe en reguleringskrumtap af denne art på den ene af de tværgående kanter på konditioneringsskærmen på en sådan måde, at denne kan være fastgjort til chassiset eller maskinens krop ved sin anden kant. Den hurtigt virkende reguleringsmekanisme er da fortrinsvis anbragt ved den øvre bageste kant 30 af konditioneringsskærmen, som omslutter en forreste del af rotorens omkreds. Men det ville naturligvis også være muligt at anbringe en sådan reguleringsmekanisme ved skærmens to tværstillede kanter, henholdsvis for- og bagkanten. 1The tests performed have shown that it is sufficient to place a control crank pin of this kind on one of the transverse edges of the conditioning screen in such a way that it can be attached to the chassis or machine body at its other edge. The fast-acting control mechanism is then preferably positioned at the upper rear edge 30 of the conditioning screen which encloses a front portion of the rotor circumference. But of course it would also be possible to place such a control mechanism at the two transverse edges of the screen, the front and rear edges respectively. 1

Ifølge en udførelsesform, der har vist sig fordelagtig med henblik på at opnå en ensartet reguleringsstilling over hele konditioneringsskærmens længde, er krumtappen fremstillet 3According to an embodiment which has proved advantageous in order to achieve a uniform control position over the entire length of the conditioning screen, the crank is made 3

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af en lang krumtapsøle, som er i indgreb i en fals ell-er tilsvarende profilering ved den tilhørende kant af konditione-ringsskærmen og ved hjælp af krumtaparme forbundet med udvendige tappe, der er ledforbundne med faste dele af maskinen, 5 og. som kan bevæges ved svingning for at regulere vinkelstil lingen for krumtappen og således for at modificere profilen af stålpladen, der danner konditioneringsskærmen og som følge heraf dens stilling i forhold til spidserne af rotorens tænder eller fingre. Den anvendte fals i stålpladen til optagning 10 af krumtrapsølen kan være ubrudt og kan strække sig i det mindste over hovedparten af skærmens længde, eller krumtap-sølen kan være i indgreb i nogle særlige optagningslejer ved den pågældende kant, der er fordelt over denne længde af skærmen, og som f.eks. er dannet af nogle flige, der er ombøjet IS eller omrullet fra stålpladen.of a long crank column engaging a fold or similar profiling at the associated edge of the conditioning screen and by crank arms connected to exterior pins jointed with fixed portions of the machine, 5 and. which can be moved by oscillation to control the angular position of the crankshaft and thus to modify the profile of the steel plate forming the conditioning screen and, consequently, its position relative to the tips of the teeth or fingers of the rotor. The rim used in the steel plate for receiving the crankcase may be unbroken and may extend at least over most of the length of the screen, or the crankcase may be engaged in some special receiving bearings at the particular edge distributed over this length of screen, and such as is formed by some tabs that are bent IS or rolled from the steel plate.

Ifølge et andet træk, der synes fordelagtigt med henblik på at lette reguleringsfunktionen, er en vægtarm gjort vinkelfast med den ene af tappene på krumtappen, og denne vægtarm er 20 forbundet med en rigel eller et lignende organ, der kan være i indgreb i det ene af flere indhak, som findes i et blokeringsorgan, der er fastgjort til maskinen, f.eks. i et reguleringssegment .According to another feature which seems advantageous in order to facilitate the control function, a weight arm is angularly fixed to one of the pins on the crank, and this weight arm is connected to a bolt or similar means which may be engaged in one of several notches present in a blocking means attached to the machine, e.g. in a regulatory segment.

25 Ifølge en mulig udførelsesform kan man anbringe et regule ringssegment, der er fastgjort på maskinen, og som er forsynet med indhak, hvori en rigel, der er påvirket elastisk hen imod sin arbejdsstilling eller imod indhakkene, kan være i indgreb, men som kan skubbes ud af dette på en sikker måde med henblik 30 på regulering af skærmen.According to a possible embodiment, a control segment secured to the machine may be provided with a notch in which a bolt which is elastically actuated towards its working position or against the notches may be engaged but which can be pushed out of this in a secure manner for the purpose of controlling the screen.

Man ser således, at'det er tilstrækkeligt med en mekanisme af den ifølge opfindelsen angivne art at bevæge reguleringsarmen og at føre den ind i den ønskede indhaksstilling i forholi 35 til reguleringssegmentet eller blokeringsanordningen for ved hjælp af elasticiteten i den stålplade, der danner konditioneringsskærmen at ændre profilen på denne skærm og især dens 4Thus, it is seen that it is sufficient for a mechanism of the kind according to the invention to move the control arm and to move it into the desired notch position in the aperture 35 of the control segment or the blocking device so that by means of the elasticity of the steel plate forming the conditioning screen change the profile on this screen and especially its 4

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frigang i forhold til enderne af tænderne eller fingrene på rotoren for således at tilpasse den til de til enhver tid givne arbejdsforhold med henblik på opnåelsen af et optimalt arbejde. Man forstår, at denne operation kan realiseres meget S hurtigt af føreren af det køretøj, hvortil grønthøsteren er koblet, uden at denne operation kræver anvendelsen af noget værktøj eller nogen særlig kunnen fra operatørens side.release relative to the ends of the teeth or fingers of the rotor so as to adapt it to the given working conditions at any given time in order to achieve optimal work. It is understood that this operation can be realized very quickly by the driver of the vehicle to which the green harvester is attached, without this operation requiring the use of any tool or any special skill on the part of the operator.

I det følgende beskrives opfindelsen nærmere under henvis-10 ning til tegningen, hvor fig. 1 skematisk viser en grønthøster, hvori opfindelsen er anvendt, set fra siden, og 15 fig. 2 et perspektivisk eksploderet billede af konditione- ringsskærmen og af dens reguleringsmekanisme.BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which 1 is a schematic side view of a green harvester in which the invention is applied; and FIG. 2 is a perspective exploded view of the conditioning screen and its control mechanism.

På fig. 1 ses skematisk en grønthøster, som omfatter et chassis 1, som bliver båret over jorden af baghjul 2, hvilket 20 chassis med en trækstang eller en koblingsstang, hvoraf en del er vist ved 3, er forbundet med en traktor, som kan være en landbrugstraktor.In FIG. 1 is a schematic view of a green harvester comprising a chassis 1 carried over the ground by rear wheels 2, which chassis with a drawbar or clutch rod, a part of which is shown at 3, is connected to a tractor which may be an agricultural tractor .

Chassiset 1 bærer en knivbjælke, der generelt er betegnet 25 med henvisningstallet 4, og som her omfatter en bjælke 5, hvorpå der er monteret nogle roterende skæreskiver 6, som parvis drejer i modsatte retninger på en i og for sig kendt måde for at afskære eller meje høstmaterialerne på marken under maskinens fremføring.The chassis 1 carries a knife bar, generally designated 25 by reference numeral 4, which includes a bar 5 on which are mounted some rotary cutting discs 6, which rotate in opposite directions in pairs in a manner known per se to cut or cut. mow the harvesting materials on the field during machine feed.

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Chassiset 1 bærer ligeledes to sidevægge 7, mellem hvilke der er monteret en rotor, som generelt er betegnet med henvisningstallet 8, og som på i og sig kendt måde omfatter en tværgående vandret aksel 9, som ved hjælp af sideplader eller 35 nav 10 bærer tænder eller fingre 11, der er ledforbundne med disse plader, ligeledes på en i og for sig kendt måde.The chassis 1 also carries two side walls 7, between which is mounted a rotor, generally designated by the reference numeral 8, and which in a known manner comprises a transverse horizontal shaft 9 which carries teeth by means of side plates or 35 hub 10 or fingers 11, which are jointed with these plates, also in a manner known per se.

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En kondltioneringsskærm 12 er anbragt på maskinen mellem sidestykkerne 7. Denne kondltioneringsskærm omslutter som vist i fig. 1 den forreste og den øverste del af konditionerings-rotoren. En bageste afkastningsskærm 34 bliver ligeledes bå-5 ret af maskinens chassis 1.A conditioning screen 12 is placed on the machine between the side pieces 7. This conditioning screen encloses as shown in FIG. 1 shows the front and upper parts of the conditioning rotor. A rear return shield 34 is also carried by the chassis 1 of the machine.

Den samlede virkning af en grønthøster af denne art er velkendt. Høstmaterialerne, der er afskåret af skiverne 6 på knivbjælken 4, bevæges bagud oven over disse skiver 6 og bliver 10 så ført med tilbage af tænderne eller fingrene 11 på rotoren 8, som bliver drevet rundt med høj hastighed af passende midler (ikke vist) i retningen imod urvisernes retning, når man ser på fig. 1. Skærmen 12 har til formål sammen med tænderne eller fingrene på rotoren 8 at sikre konditioneringen af høst-15 . materialerne og at lede disse materialer for at få dem til at passere oven over rotoren, idet disse materialer så bliver kastet bagud og slået ned mod jorden i en skår af den bageste afbøjningsskærm 34.The overall effect of a green harvester of this kind is well known. The harvesting materials cut off by the washers 6 of the cutter bar 4 are moved backwards above these washers 6 and are then brought back by the teeth or fingers 11 of the rotor 8, which are driven around at high speed by suitable means (not shown) in the direction of the clockwise direction when looking at FIG. 1. The purpose of the screen 12 together with the teeth or fingers of the rotor 8 is to ensure the conditioning of the harvest 15. the materials and to guide these materials to make them pass above the rotor, these materials being then thrown back and knocked to the ground in a groove of the rear deflection screen 34.

20 Som påpeget i det foregående ved man, at for at opnå en passende konditionering af materialerne er det nødvendigt at kunne tilpasse stillingen af konditioneringsskærmen i forhold til rotoren og især afstanden mellem denne skærm og de frie ender af fingrene på konditioneringsrotoren efter de til enhver 25 tid herskende arbejdsforhold, i særdeleshed efter fugtigheds-graden og arten af de høstmaterialer, der skal mejes og konditioneres.20 As pointed out above, it is known that in order to obtain adequate conditioning of the materials it is necessary to be able to adjust the position of the conditioning screen relative to the rotor and in particular the distance between this screen and the free ends of the fingers of the conditioning rotor according to any time prevailing working conditions, especially by the degree of moisture and the nature of the harvesting materials to be mown and conditioned.

Ifølge den aktuelle udførelsesform er konditioneringsskærmen 30 12 ved sin nedre forreste kant forsynet med to flige 13, som er fastgjort på sidevæggene 7 på maskinens krop. Denne skærm viser her ved sin øvre kant en ombøjning af stålpladen 14, som er let synlig, også på fig. 2, og som strækker sig over. den største del af skærmens længde.According to the present embodiment, the conditioning screen 30 12 is provided at its lower front edge with two tabs 13 which are secured to the side walls 7 of the machine body. This screen here shows at its upper edge a bending of the steel plate 14, which is easily visible, also in FIG. 2, and extending over. the largest part of the screen length.

Ifølgeopfindelsen er der anbragt en dobbelt krumtap 15, som omfatter en lang krumtapsøle 16, som ved hjælp af nogle ydre 35According to the invention, a double crank 15 is provided which comprises a long crank 16, which by means of some outer 35

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6 arme 17 er forbundet med to tappe eller akselender 18,· som er monteret, så de kan dreje i sidestykkerne 7 på grønthøste-rens krop. Som det fremgår af fig. 1, er krumtapsølen 16 på krumtappen fastholdt i falsen i stålpladen 14 på skærmen 12.6 arms 17 are connected to two pins or shaft ends 18 which are mounted so that they can rotate in the side pieces 7 on the body of the green harvester. As shown in FIG. 1, the crankcase 16 on the crank is held in the seam of the steel plate 14 on the screen 12.

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En sideskærm 7 bærer et reguleringssegment 19, som er fastgjort på denne, og som er forsynet med en del, der danner et nav, som gennemtrænges af en tappene 18. Segmentet 19, som er fast, har en udskæring eller en lysning 20, som er forsynet med 10 indhak 21, der er fordelt over en cirkelbue. En regulerings arm, der generelt er betegnet med henvisningstallet 22, omfatter en akselende 23, som er i indgreb i tappene 18, hvortil den er fastgjort f.eks. ved hjælp af en låsestift 24, og en arm 25, der har en udtagning 26, hvilken arm ender i en ret- 15 vinklet flig 27, der bærer et rør 28, som er anbragt i forlæn gelse af armen 25. En rigel 29 består af en stang, som er bøjet i en vinkel på 90° eller i L-form. Den længste gren 30 på denne rigel er lejret inde i røret 28, medens dens korteste gren 31 træder ind i udtagningen 26, som befinder sig 20 i armen 22, idet den strækker sig tværs igennem udskæringen 22 i reguleringssegmentet 19. En fjeder 32, som ligeledes er indsat i røret 28 rundt om grenen 30 på rigelen 29, støtter sig mod bunden af dette rør. En trykstang 33 dækker over denne fjeder, og det yderste af grenen 30 på rigelen 29, til hvilken 25 den er fastgjort i længderetningen, f.eks. med en låsestift.A side shield 7 carries a control segment 19 attached thereto and provided with a portion forming a hub which is penetrated by a pins 18. The segment 19 which is fixed has a cut or groove 20 which is provided with 10 notches 21 distributed over a circular arc. A control arm, generally designated by the reference numeral 22, includes a shaft end 23 which engages the pins 18 to which it is attached e.g. by means of a locking pin 24, and an arm 25 having a recess 26, said arm ending in a rectangular tab 27 carrying a tube 28 disposed in extension of the arm 25. A bolt 29 consists of a rod bent at an angle of 90 ° or in L-shape. The longest branch 30 of this bolt is housed within the tube 28, while its shortest branch 31 enters the recess 26, which is located 20 in the arm 22, extending across the cutout 22 in the control segment 19. A spring 32 which likewise inserted into the tube 28 around the branch 30 of the bolt 29, rests against the bottom of this tube. A push rod 33 covers this spring, and the outermost of the branch 30 of the bolt 29 to which it is attached longitudinally, e.g. with a locking pin.

Fremgangsmåden til brug af den således beskrevne mekanisme forstås let ud fra den foregående beskrivelse. I hvilestillingen virker fjederen 32 imod rigelen 29 med henblik på at 30 holde dens gren 31 i indgreb i et af indhakkene 21 i udskæringen 20 i segmentet 19. Under forudsætning af, at dette segment 19 er fastgjort på det ene af sidestykkerne 7 i grønt-høsterens krop 1, er krumtappen 15 således gjort ubevægelig, og konditioneringsskærmens 12 stilling er fikseret.The method of using the mechanism thus described is readily understood from the foregoing description. In the resting position, the spring 32 acts against the bolt 29 in order to hold its branch 31 in engagement with one of the notches 21 in the cut-out 20 in the segment 19. Provided that this segment 19 is fixed to one of the side pieces 7 in the green. thus, in the body of the harvester 1, the crank 15 is made immobile and the position of the conditioning screen 12 is fixed.

Hvis indstillingen mellem konditioneringsskærmen 12 og rotoren 8 skal ændres, f.eks. for at tage højde for en ændring i 35If the setting between the conditioning screen 12 and the rotor 8 needs to be changed, e.g. to account for a change in 35

Claims

A green harvester of the kind comprising a cutter bar (4) at the bottom, and where a rotor (8) is provided towards the rear end thereof, provided with teeth or fingers (11), and which rotates about a horizontal axis transverse to the direction of travel of the machine, which is combined with a conditioning shield (12) held only at its transverse front and rear edges and enclosing a portion of the rotor (8) perimeter to guide the harvesting material backed by the rotor (8) after leaving the cutter bar to cause it to pass above the rotor for its ejection into a notch on the ground behind the machine and the screen (12) can be adjusted at its holding locations such that one or the two transverse edges can be displaced relative to the periphery of the rotor, characterized in that the conditioning screen (12), which consists of an elastically deformable steel plate, at least oneof its transverse edges is retained by a fast acting regulating mechanism, which consists of a crank (15) connected to at least one fixed part of the machine and connected directly to said transverse edge of the screen and whose angular position can be controlled by changing the profile of the conditioning screen and thereby its position relative to the rotor (8) by an elastic deformation of the steel plate.

A green harvester according to claim 1, characterized in that the fast-acting control mechanism formed by a crank (15) is connected to the upper rear edge (14) 25 of the conditioning screen (12) which encloses a front part of the rotor. periphery.

Green harvester according to claim 1, characterized in that it has a fast-acting control mechanism consisting of a crank (15) at both the two transverse edges, front and rear of the screen (12).

Green harvester according to one or more of claims 1-3, characterized in that the crank (15), in order to achieve a uniform control position over the entire length of the conditioning screen (12), consists of a crank (16). ) having a large length which engages a seam (14) or a corresponding profiling at the edge of the associated conditioning screen (12) and is connected to some crank arms (17) with external pins (18), which are articulated with some fixed parts of the machine and which can be moved by oscillation to adjust the angular position of the crank (15).

Green harvester according to claim 4, characterized in that the seam of the steel plate (14), which is intended to receive the crankcase (16) on the crank (15), is unbroken and extends at least over most of the screen ( 12) length. es

Green harvester according to claim 4, characterized in that the crank column (16) of the crank (15) is engaged in some special receiving bearings at the respective edge, which are distributed along ·· c * 15 with the length of the screen (12), and which in particular is formed by tabs that are bent out or rolled out of the steel plate.

Green harvester according to one or more of claims 4-6, characterized in that a weight arm (22) is angularly connected to one of the pins (18) on the crank (15), which weight arm cooperates with a bolt (29). or a similar means which may be engaged by one of a plurality of notches provided in a regulating means or a blocking means attached to the machine, e.g. in a control segment (19). 25

A green harvester according to claim 7, characterized in that the control segment (19) is provided with notches (21) in which a bolt (29) which is elastically actuated towards its working position can be engaged and where means are provided. (33) 30 to push this bolt (29) out of its blocking position for adjustment of the conditioning screen. 35