Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. IN201717026784 - CONVEYING MEMBER WITH ROLLER MECHANISM

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
The invention relates to the field of conveying members for a conveyor, and in particularto the field of conveying members for an accumulating conveyor. These conveying memberscomprise a conveying element which forms a main surface, and at least one roller mechanismwith at least one roller. The invention moreover relates to conveyors which comprise suchconveying members.Such a conveying member is known for example from WO 01/32533. A modular beltchain whose modules comprise a unit which can be retracted relative to the main surface of themodules is described in this document. Here, on the one hand the unit can project beyond themain surface and on the other hand can be arranged flush with the main surface or below this.Amongst other things, the retractable unit can comprise a roller which in one embodiment of theretractable unit is freely rotatable and in another embodiment of the retractable unit is driven. In afurther embodiment, the retractable unit can comprise rigid drivers. In this manner, the modularbelt chain can either convey the conveyed objects on the main surface of the modules in amanner assisted by drivers or also without drivers, on freely rotatable rollers or on driven rollers,depending on the embodiment and the position of the retractable unit.Such a known module which can be described as a conveying member however has thedisadvantage that the retractable units take up much space in the retracted condition, by whichmeans the conveying members are not able to be compactly designed.The described, known conveying member also has the disadvantage that a specificembodiment of the retractable unit is required for each individual change in the type ofconveying (with or without drivers, on freely rotatable rollers or not, on driven rollers or not).This results in a cumbersome and complicated design of the conveying member, particularly ifmore than only two types of conveying are to be possible.Each change of the type of conveying thus necessitates a specific embodiment of theretractable unit which moreover must be present on the module in a sufficiently high number inorder to be able to fulfil its function. The conveying members therefore need to be provided witha high number of different retractable units, depending on the demands. This also results in acumbersome and complicated design of the conveying member.A complete retraction of the retractable module can result in long paths between theretracted position of the retractable module and the non-retracted position. Due to large distances3between both positions, the retractable module can only be moved slowly between the twopositions or however rapidly and amid a high material loading.The cumbersome and complicated design of the conveying member entails high costs onmanufacture, maintenance and repair. Cumbersome and complicated designs are moreover proneto wear and defects.A cumbersome and complicated design of the conveying member moreover results in ahigh weight of the conveying member in the case of a robust embodiment and this leads to highenergy consumption on moving the conveying member.It is therefore the object of the invention to create a conveying member of the initiallymentioned type and/or a conveyor with such a conveying member, said conveying member andconveyor at least partly overcoming at least one of the disadvantages which are mentionedabove.The inventive conveying member for a conveyor comprises a conveying element and atleast one roller mechanism. The conveying element forms a main surface. The roller mechanismcomprises at least one roller which comprises a physical roller pivot, and a roller holder. Theroller pivot is fastened to the roller holder. The roller holder can interact with an actuating means.The roller holder is arranged on the conveying element and is designed in a manner such that theroller pivot is movable relative to the main surface of the conveying element at least between afirst position and a second position which is spatially different from the first position. In the firstas well as in the second position of the roller pivot, the roller projects at least partly beyond themain surface of the conveying element. In the first position of the roller pivot, the roller is able toassume an arrested position. Andin the second position of the roller pivot, the roller is able toassume a freewheel position. Here, the roller in the arrested position is arrested with respect to arotation relative to the main surface and in the freewheel position is freely rotating.In particular, the conveying member is designed in a manner such that the roller projectsat least partly beyond the main surface of the conveying element in the first and in the secondposition of the roller pivot as well as in all positions on a displacement path between the first andthe second position of the roller pivot.In particular, the roller holder is designed in a manner such that the roller projects at leastpartly beyond the main surface of the conveying element in all possible positions of the rollerpivot in the roller holder.4In particular, the conveying member is a conveying member for an accumulatingconveyor.In particular, the object to be conveyed is a piece good. The object to be conveyed forexample can be a package, a bundle, a collecting container or a shell.The conveying member can be designed for example as a plate for fastening to aconveying means. The conveying means can be loaded in tension and/or compression by way ofthe conveying. The conveying member can be designed for instance as a plate for fastening to apull means and in particular to a chain of a plate chain conveyor.The conveying member can also be designed for instance as a module of a modular beltchain, wherein the modular belt chain itself (also called a mat chain) serves as the conveyor.The conveyor can be designed as a plate chain conveyor, wherein this comprisesconveying members in the form of plates which are fastened to a conveying means and inparticular to a conveying chain.The conveyor can also be designed as a modular belt chain conveyor or, describeddifferently, as a mat chain conveyor, wherein the modular belt chain comprises individualconveying members in the form of modules which are connected to one another.The main surface of a conveying element faces the object to be conveyed. The object tobe conveyed can be in contact with the main surface, for example lie on the main surface. Theobject to be conveyed can also be conveyed in a manner, in which it has no direct contact withthe main surface, for instance if the conveyed object lies on one or more elements which projectbeyond the main surface. Such elements which project beyond the main surface can for instancecomprise rollers and/or be rollers.The main surface covers parts of the conveyor which are arranged below the conveyedobject, to the conveyed object.The main surface has the advantage that it can form an essentially continuous surfacegiven a suitable arrangement of adjacent conveying members. In this context, essentiallycontinuous means that a distance having an area of maximally 30% of the main surface is locatedbetween adjacent main surfaces. In particular, a distance having an area of maximally 15% of themain surface is located between two adjacent main surfaces.5This essentially continuous surface can prevent the conveyed object from falling throughintermediate spaces between the rollers, by way of the conveyed object lying on the main surfaceand being held back by the main surface. A conveyor with an essentially continuous surface canbe used for a multitude of different conveyed objects by way of this, and specificallysimultaneously (thus mixed conveyed objects) and/or in a temporally staggered manner(alternating groups of conveyed objects of the same sort).An essentially continuous surface also serves for the operational reliability since no oronly small gaps exist between the conveying elements and a risk of jamming, snagging ordragging is low.A roller holder is designed in a manner such that the roller is held by the roller holder.The physical roller pivot of the roller can be designed and arranged rigidly with respect tothe roller. However, the physical roller pivot of the roller can also be designed and arranged in arotatable manner with respect to the roller. A "rotation of the roller about the roller axis" cantherefore indicate a roller rotating relative to the physical roller pivot as well as a roller rotatingtogether with the physical roller pivot.The actuating means is a means for interacting with at least one part of the roller holder.Interacting is to be understood as a non-positive interaction. A spatial configuration at least of apart of the roller holder can be changed by the actuating means.The roller holder is arranged on the conveying element, by which means the roller holder,the roller and the roller pivot are co-moved with the conveying element.Since the roller pivot is movable relative to the main surface of the conveying element atleast between a first position and a second position which is spatially different from the first one,the roller is also movable with the roller pivot between at least one first position and a secondposition which is spatially different from the first one."Movable relative to the main surface" means that a movement with at least a partcomponentin a direction which is orthogonal to the main surface is possible. In other words,"movable relative to the main surface" means that a distance to the main surface is changeable."Projecting beyond the main surface of the conveying element" means projecting into theconveying space. The roller which projects at least partly beyond the main surface of theconveying element therefore projects at least partly beyond the main surface into the conveyingspace. The roller simultaneously projects at least partly beyond the roller mechanism, so that the6roller at least at one location projects beyond the main surface as well as beyond the rollermechanism.The conveying space is indicated as a space which connects to the main surface and inwhich the object conveyed by the conveyor can be arranged.The roller holder is designed in a manner such that the roller can assume the arrestedposition and in this arrested position is arrested with respect to a rotation about the roller axis andon account of this with respect to a rotation relative to the main surface. In other words, in thearrested position, the roller is arranged rigidly with respect to the main surface. In particular, inthe arrested position, the roller pivot as well as the roller is spatially arrested, thus fixed, withrespect to the main surface.The roller which projects out of the main surface in the arrested position of the roller canact for example as a driver of the conveying member. The driver increases a force action of theconveying member upon the conveyed object. What is meant by a force action is for example atransmission of kinetic energy from the conveying member onto the conveyed object.The roller holder is moreover designed such that the roller can assume the freewheelposition and in this freewheel position is freely rotatable relative to the main surface. Here, freelyrotatable means that a running surface of the roller is free of contact with parts of the rollermechanism other than the roller. In other words, in the freewheel position the roller is mountedin a freely rotatable manner with respect to the main surface. Here, the roller pivot can likewisebe freely rotatable relative to the main surface. However, in the freewheel position of the rollerthe roller pivot can also be arranged rigidly with respect to the main surface.The roller which projects out of the main surface in the freewheel position of the rollercan act for example as a linear bearing of the conveying member. The linear bearing serves for apractically friction-free translation of the conveyed object relative to the conveying member, thusreduces a force action of the conveying element upon the conveyed object.The conveying member described above has the advantage that the conveying member iscapable of at least two types of conveying, but despite this has a simple design.The conveying member can be designed compactly by way of the roller neither beingretracted in the conveying member in the first position nor in the second position of the rollerpivot (i.e. by way of it projecting beyond the main surface in both positions).7The conveying member can be designed having a low weight even with a robust designof its embodiments.The roller pivot can be moved from the first to the second position (and vice versa)through a reduced spatial movement. Small distances between the positions permit a rapidchange between the positions and/or one which is gentle on the material.The roller can comprise a running surface which is designed in a rubberised manner.The running surface of the roller is a surface of the roller which can come into contactwith the conveyed object. A rubberised running surface has a high static friction coefficient andsliding friction coefficient.In particular, the roller can be designed in a crowned manner. This means that therunning surface of the roller has a convex cross section.Crowned rollers can come into contact with the conveyed object in a manner which isgentle on the material on account of their rounded cross section.As an optional feature, the roller holder is designed in a manner such that in a driveposition of the roller, the roller is driven in the roller holder and the roller at least partly projectsbeyond the main surface of the conveying element.What is meant by a driven roller is a roller which rotates about the roller axis at apredefined speed by way of an external force action (by way of a drive).A crowned roller for example permits the drive to be provided with a step-up or stepdowntransmission in a simple manner. The stepping-up or stepping down of the drive is effectedby way of the drive driving the roller at different distances to the roller axis, which is possibledue to the crowned shape. In a typical case of a transmission, the conveyed object lies on theroller at the point of the running surface which is furthest from the roller axis. In contrast, thedrive engages in a manner shifted to the point which is distanced furthest to the roller axis andlies closer to the roller axis. The conveyed object is driven with a step-down by way of this, istherefore driven at a greater speed than the drive.It is also possible for the drive to drive the roller with a step-up - the conveyed object isthus driven at a lower speed than the drive. This can be effected for example by way ofadditional wheels and/or rollers, thus by way of a gearing mechanism.8In its drive position, the roller projects at least partly into the conveying region andthereby projects at least partly beyond the roller mechanism at least at one location.In particular, the drive position differs from the arrested position by way of a differentspatial position of the roller pivot. The position of the roller pivot in the drive position and in thefreewheel position can correspond to one another. However, the position of the roller pivot in thedrive position can also be different to the position of the roller pivot in the freewheel position.Due to an additional drive position of the roller, the conveying member has the advantagethat the conveying member is capable of at least three types of conveying, but despite this has asimple design.The conveying member can be designed in a compact manner by way of the roller neitherbeing retracted in the conveying element which is to say below or in the main surface, in thedrive position, nor the locking position, nor the freewheel position (i.e. the roller projectingbeyond the main surface in all three positions).The conveying member can be designed with a low weight even in its robustembodiments.The roller can be moved from one of the three positions into another of the threepositions of the roller by way of a small spatial movement. Small distances between the positionspermit a rapid change between the positions and/or one which is gentle on the material.As a further optional feature, the actuating means can comprise at least one rail which isspatially fixed in at least one position with respect to the conveyor.The rail itself can serve as an actuating means, by way of it being able to interact with atleast a part of the roller holder.The rail for example can comprise different regions for tasks which are different to oneanother. For instance, the rail can comprise a region for the movement of the roller pivot into thefreewheel position of the roller, and a region for the drive position of the roller. In the region forthe drive position, the rail can be designed for example in a manner such that the roller rolls onthis region of the rail.The actuating means can comprise several rails which comprise one and/or more regionsfor tasks which are different to one another.9The rail can be spatially fixed in at least one position. In this manner, the rail is not comovedin the conveying direction of the conveyor.The rail can be spatially fixed for example in a first position, in which it can interact withroller guides, and can be brought into a second spatial position, in which it cannot interact withthe roller guides. In this manner, the rail and, by way of this, the actuating means can be designedso as to be able to be switched on and off.A rail is an inexpensive and robust actuating means. Rails operate in a reliable mannerand have a simple design, which entails advantages which are described further above.As another optional feature, the roller holder comprises a guide for a translatorydisplacement of the roller pivot.In particular, the roller holder comprises a pivot holder for the roller pivot and a slidingguide for the roller pivot with the pivot holder.A translatory displacement permits a precise movement of the roller pivot in a certaindirection with the shortest of paths. The translatory displacement of the roller pivot here iseffected at least with a component perpendicular to the main surface of the conveying element.The roller pivot can be fastened in the pivot holder in a rotationally fixed manner or in amanner rotating in this. A sliding guide is simply, inexpensively and efficiently manufacturable,serviceable and replaceable.Alternatively, the roller holder can comprise a pivoting holder for a pivoting movementof the roller pivot.Optionally, the translatory displacement is aligned essentially orthogonally to the mainsurface.The translatory displacement can also be aligned orthogonally to the main surface.In particular, a sliding direction of the sliding guide is aligned essentially orthogonally tothe main surface. The sliding direction of the sliding guide can be aligned orthogonally to themain surface.10"Essentially orthogonally" means orthogonally plus/minus 30 degrees and in particularplus/minus 15 degrees. The translatory displacement (and in particular the sliding direction of thesliding guide) can therefore be effected orthogonally to the main surface or with a deviation ofup to 30 degrees (and in particular of up to 15 degrees) from the perpendicular to the mainsurface.A rapid and efficient movement of the roller pivot relative to the main surface can beeffected by way of an alignment of the translatory displacement which is essentiallyperpendicular to the main surface of the sliding guide.As a further optional feature, the roller mechanism comprises an arresting device. In thearrested position the roller thereby lies on the arresting device in the direction of gravity.For example, a running surface of the roller lies on the arresting device.The arresting device of the roller mechanism effects the arresting of the roller in itsarrested position.If the roller lies on arresting device in the direction of gravity, then the arresting devicecan act in a self-arresting manner. In this case, self-arresting means that the roller is pressed intothe arresting device in the direction of gravity by way of its own weight and/or the weight of theconveyed object and in this manner, given an increasing pressure, a greater arresting force isexerted by the arresting device onto the roller.In particular, the arresting device can serve as a lower stop for the roller, in which theroller assumes the arrested position.What is meant by lower is a position which is downstream in the direction of gravity.Here, a lateral shifting relative to the direction of gravity is of no significance - also with laterallyshifted positions it is those which are arranged further downstream in the direction of gravitydirection which are counted as lying further to the bottom. Expressed differently, a first positionlying further to the bottom, at least with regard to components, in the direction of gravity isarranged downstream of a second position lying further to the top. This analogously applies toother height details (lower, upper, same height).Basically, in this application, the conveying member and the conveyor are described forthe case of a conveying in the horizontal direction (thus transversely to the direction of gravity).The directional details are to be understood as being adapted accordingly in the case ofconveying in other directions.11As an optional feature, the arresting device is designed as a braking frame. The brakingframe has an opening which corresponds to a contour of the roller, wherein in the arrestedposition, the roller lies on the braking frame in a manner reaching into the opening in thedirection of gravity. The roller projects partly into the opening in the direction of gravity in thismanner.In particular, the roller projects through the braking frame.Such a braking frame can act in a self-arresting manner and has a simple design. Thebraking frame can be arranged in a space-saving manner by way of the roller projecting throughthe braking frame, and this permits a compact construction manner of the conveying member.As a further optional feature, the braking frame is rigidly fastened to the rollermechanism. Here, the braking frame is designed stationarily with respect to the conveyingelement.As a further optional feature, the roller holder is designed in a manner such that a spatialposition of the roller in the arrested position lies further to the bottom than in the freewheelposition. In particular, in the arrested position, the roller can lie furthest to the bottom incomparison to the all other positions of the roller.In particular, the roller in the freewheel position can be arranged furthest to the top incomparison to all other positions of the roller and in the drive position inasmuch as this is presentcan be arranged further to the top than in the arrested position and at the most as far to the top asin the freewheel position.The roller in the arrested position can therefore be arranged further to the bottom than theroller in the freewheel position.In the drive position, the roller can be arranged further to the bottom, equally high orfurther to the top than the roller in the freewheel position.An arrested position arranged at the very bottom permits a self-arresting design of theroller mechanism and simultaneously a simple and compact construction manner of theconveying member.12The roller mechanism optionally comprises an adjusting mechanism which is designed ina manner such that the roller is capable of assuming different spatial lateral positions transverselyto the conveying direction of the conveyor.The roller can assume the arrested position and the freewheel position and possiblyfurther positions (in particular the drive position) in the various lateral positions. The roller ismovably fastened to the conveying member transversely to the conveying direction by way ofthe adjusting mechanism. In particular, the roller can be displaceably fastened in the adjustingmechanism transversely to the conveying direction. The adjusting mechanism can be designedfor example as a rail, on which movably assembled rollers are arranged.The adjusting mechanism permits a targeted change of the roller position and thus anadaptation of the conveying characteristics of the conveying member to different conveyedobjects. The conveying member can be applied in a comprehensive and flexible manner in thisway.A further aspect of the invention relates to a conveyor which comprises a conveyingmember according to the invention (as described above) as well as an actuating means. Here, theroller pivot can be moved relative to the main surface of the conveying element between at leasttwo positions which are spatially different from one another, by way of the actuating means.The optional features and all respective advantages of the conveying member accordingto the invention are described above and are also applicable to the conveyor.Concerning the conveyor, the actuating means is optionally arranged and designed in amanner such that in the freewheel position of the roller it supports the roller pivot counter to thedirection of gravity in a direct or indirect manner and the roller is freely rotating due to this.The actuating means thus brings the roller into the freewheel position by way of itsupporting the roller pivot to the top. The actuating means can support the roller pivot to the topin a direct manner, thus in a contact fit with the roller pivot, or indirectly, thus without directcontact but for example via indirect contact, for instance via a contact fit with pivot holders. Thearrested position can be arranged further to the bottom by way of this.As a further optional feature of the conveyor, the conveying member comprises an upperstop for the roller pivot, said stop being designed and arranged in a manner such that in thefreewheel position, the actuating means is capable of pressing the roller pivot directly orindirectly against the upper stop counter to the direction of gravity.13The actuating means can be designed and positioned in a simple and robust manner byway of an upper stop for the freewheel position, wherein the roller is simultaneously capable ofreliably assuming the freewheel position.In the case for example that the roller pivot is held in the pivot holder, the pivot holdercan be pressed against the upper stop when the roller is to be in the freewheel position.As another optional feature of the conveyor, in the drive position, the running surface ofthe roller can be in frictional contact with a rolling guide (rolling guidance). Here, the rollingguide in particular is encompassed by the actuating means.The roller is thus driven by the rolling of the running surface of the roller on the rollingguide. The rolling guide for example can be formed on the actuating means. Thus for instance anactuating means and in particular a rail, at a side of the roller which lies opposite the mainsurface can be in frictional contact with the running surface of the roller and form a rolling guidein such a manner.A drive by way of a rolling guide is simply and inexpensively manufacturable,serviceable and repairable. A rolling guide can be designed in a simple and robust manner.In particular, the conveyor can be designed as a plate chain conveyor. Here, theconveying member is designed as a plate fastened to a chain.Alternatively, the conveyor can be designed as a mat chain conveyor (also called amodular belt chain conveyor). Here, the conveying elements are connected to one another into amat chain, which is to say the modules of the modular belt chain are designed as a conveyingelement.The optional features of the conveying member and/or of the conveyor can be combinedwith one another.The subject-matter of the invention is hereinafter explained in more detail by way ofpreferred embodiment examples which are represented in the accompanying drawings. There, ineach case schematically shown in:Figure 1 a perspective view from above onto a conveying element;Figure 2 a view of the conveying element of Figure 1, from the front;Figure 3 a perspective view of the conveying element of Figure 1 from below;14Figure 4 a detail of a view of the conveying element of Figure 1 from the front, with aroller in the freewheel position;Figure 5 a detail analogously to Figure 4, with the roller in the drive position;Figure 6 a detail analogously to Figure 4, with the roller in the arrested position;Figure 7 a lateral view of the conveying element of Figure 1;Figure 8 a perspective view from above onto a part of the conveyor comprising theconveying member of Figure 1;Figure 9 a view from the front onto a part of the conveyor of Figure 8.Generally, the same parts are provided with the same reference numerals in the figures.Figures 1 to 7 show an embodiment example of a conveying member 1 and Figures 8 and 9show parts of an embodiment example of a conveyor 11.A perspective view from above onto an embodiment example of a conveying member 1according to the invention is represented in Figure 1. The conveying member 1 comprises theconveying element 2. The conveying element 2 has a rectangular outline seen from above. Broadsides of the conveying element run along the conveying direction F and are about 13 cm long.Long sides of the conveying element 2 run transversely to the conveying direction F and areabout 40 cm long.The conveying element 2 is designed in stepped manner on its upper side. A step 16 ofthe conveying element 2 is formed with a sharp bend, thus in a v-shaped manner, transversely tothe conveying direction F and on the upper side of the conveying element 2 connects a surfacelying further to the bottom and a surface lying further to the top, wherein the surface lying furtherto the top is referred to as the main surface 8. The object 20 to be conveyed can come to lie onthis main surface 8. In the regular case, the object 20 to be conveyed however comes to lieexclusively on the rollers 5 of the conveying element 2.The surface of the upper side of the conveying element 2 which lies further to the bottomis at least partly covered by a part of an adjacent conveying element 2 on application of theconveying member 1 in a conveyor 11. The conveying elements 1 are formed in this manner, sothat adjacent conveying members 1 can overlap and the main surfaces 8 of adjacent conveyingmembers 1 can come to lie in essentially the same plane by way of this. The v-shape of the step16 here permits a rotation (a rotation lying in plane encompassing the main surface 8, a so-calledside bow) of adjacent conveying members 1 relative to one another, said rotation being directedtransversely to the conveying direction F. The step 16 in the conveying element 2 is designedobliquely in the conveying direction F and disregarding rounded edges has an inclination of 45degrees.15The conveying element 2 comprises two openings in the main surface 8, through whichopenings a roller 5 extends upwards through the conveying element 2 from below the mainsurface 8. The openings lie roughly in the middle of the conveying element 2 considered in theconveying direction F, and both openings are distributed over the width of the conveyingelement 2 transversely to the conveying direction F. The rollers 5 therefore divide the conveyingelement 2 into three sections transversely to the conveying direction F.Figure 2 shows a view of the conveying member 2 of Figure 1 from the front, thusviewed counter to the conveying direction F. The two rollers 5 are each encompassed by a rollermechanism 3 and are in the arrested position. Both roller mechanisms 3 are each arranged belowthe main surface 8. Additionally to a roller 5, each of the two roller mechanisms 3 comprises aroller holder 4 and an arresting device 10. The roller holder 4 here comprises two pivot holders 9which hold the hold the pivot 6 of the roller 5 at both sides of the roller 5.A perspective view of the conveying member 1 of Figure 1 from below is represented inFigure 3. A trapezoidal shape of the arresting device 10 can be easily recognised. Here, the axisof symmetry of the arresting device 10 is aligned transversely to the conveying direction F, andthe narrow ends of the trapezoidal arresting devices 10 face the broad sides of the conveyingelement 2. The arresting devices 10 are arranged along one of its oblique sides of the v-shapedstep of the conveying element 2 (considered in a projection onto the main surface 8) by way ofthis arrangement.The arresting device 10 is designed as a metal plate which comprises an opening. Theshaping of this opening of the arresting device 10 and its dimensioning is such that the roller 5can project into the opening and the running surface of the roller 5 can come into a contact fitwith edges of the opening of the arresting device 10. If the roller 5 is in the arrested position, thenthe running surface of the roller 5 lies on the arresting device 10 in the direction of gravity andthe roller 5 projects partly through the opening of the arresting device 10. The arresting device 10is fastened to the conveying element 2 in a rigid and stationary manner and as a lower stop limitsthe movement of the roller 5 and thus also of the roller pivot 6 downstream in the direction ofgravity. In the present case, the arresting device 10 is screwed on supports which are formed bythe conveying element 2, and is arranged parallel to the main surface 8.The roller pivot 6 is designed as a metal pin, about which the roller 5 is mounted in afreely rotating manner. The roller pivot 6 projects out of the roller 5 at both sides of the roller 5,then runs through an elongate opening which is formed by the conveying element 2 and which isdesigned as a linear sliding guide, and at both sides ends in a pivot holder 9. The roller pivot 6 isconnected rigidly and thus in a rotationally fixed manner to the pivot holders 9. The linear sliding16guide which is formed by the conveying element 2 guides the roller pivot 6 orthogonally to themain surface 8. The conveying element 2 and the pivot holders 9 are manufactured of plastic.The arresting device 10 thus serves as a lower stop for the roller 5, by way of the runningsurface of the roller 5 being able to lie thereon downstream in the direction of gravity. Thearresting device 10 acts upon the roller 5 in a self-arresting manner due to the weight of the rollerand/or of the object to be conveyed. The roller pivot 6 can be moved in the direction of the mainsurface 8 by way of the linear sliding guide, wherein the conveying element 2 has formed anupper stop for this movement, on which stop the pivot holders 9 can come to abut. Theconveying element 2 thus forms an upper stop for the pivot holders 9 and thus indirectly for theroller pivots 6 and the rollers 5, and the rollers 5 are situated in the freewheel position in thisposition. The rollers are in the arrested position when the rollers 5 lie on the lower stop on thearresting device 10.The pivot holders 9, the linear sliding guide for the roller pivot 9, formed by theconveying element 2, and the upper stops for the pivot holders 9, formed by the conveyingelement 2, are encompassed by the roller holder 4.The rollers 5 have a crowned shape. The cross section of the rollers 5 (thus a sectionalong the roller axis 6) therefore has a convex shape, wherein the running surface of the rollers 5is somewhat flattened. The running surfaces of the rollers 5 are rubberised, and the rollers 5themselves consist of plastic.A detail of a section of a view of the conveying element 1 of Figure 1 from the front isrepresented in Figure 4, wherein a roller 5 is situated in the freewheel position. The conveyedobject 20 is also represented in Figure 4 and lies on the running surface of the roller 5. The object20 to be conveyed lies on the roller 5 and in the regular case is conveyed by way of contact withthe rollers 5. However, the object 20 to be conveyed can also be in contact with the main surface8 and for example at least partly lie on this.The freewheel position of the roller 5 in Figure 4 is achieved by way of the two actuatingmeans 7 which are designed as separate rails supporting the pivot holders 9 of the roller 5 frombelow and pressing these upwardly onto the upper stop. The pivot holders 9 thus lie on theactuating means 7 and by way of this are pressed upwards against the conveying element 2which for this has formed upper stops. In this position, the roller 5 in Figure 4 is situated on thefreewheel position, thus can freely rotate. The object 20 to be conveyed can thus be movedrelative to the conveying member 1 with a low force effort via the rollers 5 which are in thefreewheel position and which act as linear bearings of the conveying member 1. The conveyingmember 1 for example can be moved below the conveyed object 20, without a large force being17applied upon the conveyed object 20. In other words, the transmission of a movement energy ofthe conveying member 1 onto the conveyed object 20 is negligible due the rollers 5 being in thefreewheel position. The conveying member 1 is therefore suitable for being applied as anaccumulating conveyor, where the conveying member 1 is moved, but the conveyed object 20 isaccumulated if necessary, i.e. can be held back in comparison to the movement of the conveyingmember 1.A detail is represented in Figure 5 analogously to Figure 4, but with the roller 5 in thedrive position. In contrast to Figure 4, Figure 5 only has one actuating means 7. This actuatingmeans 7 although likewise being designed as a rail, however this rail on its side which is directedto the top comprises a rolling guide, on which the running surface of the roller 5 lies from above.The rolling guide (thus the actuating means 7) supports the roller 5 from below and drives theroller 5 by way of this.The rolling guide comprises a plane surface which is aligned parallel to the main surface8. The actuating means 7 thereby engages on the roller 5 at the point which is furthest from theroller pivot 6, just as the conveyed object 20 on the opposite side of the roller 5. The transmissionratio of the drive is therefore 1, which means that the speed between the actuating means 7 andthe conveying member 1 is equally large as the speed between the conveyed object 20 and theconveying member 1. The conveyed object 20 thus, driven by the roller, moves twice as fastrelative to the actuating means 7 than the conveying member 1.With this embodiment of the conveying member 1, specifically with the pivot holders 9bearing on the upper stop, the spatial position of the roller pivot 6 and thus also of the roller 5 isidentical in the freewheel position and in the drive position. However, the drive position can alsolie further to the bottom than the freewheel position. However, in another embodiment and/orapplication the freewheel position can again lie further to the bottom than the drive position. Therunning surface of the roller 5 however cannot come into contact with the arresting device 10 inthe drive position as well as in the freewheel position.Figure 6 shows a detail analogously to Figure 4. Here, the roller 5 is in the arrestedposition. As already described further above with regard to Figure 3, the arresting device 10serves as a lower stop for the roller 5, by way of the rolling surface of the roller 5 lying on thisstop downstream in the direction of gravity. In Figure 6, the roller 5 now lies on the arrestingdevice 10 and is in the arrested position. The arrested position is the position of the roller 5which lies furthest to the bottom. The roller 5 is pressed into the arresting device 10 by way ofthe weight of the roller 5 and of the conveyed object 20, and this device thus functions in a selfarrestingmanner.18A lateral view of the conveying member 1 of Figure 1 is represented in Figure 7. Theroller 5 is thereby in the arrested position.Figure 8 shows a perspective view from above onto a part of a conveyor 11 whichcomprises conveying members 1 of Figure 1. The conveying members 1 are fastened on a chain12 by way of the conveying elements 2 each being rigidly fastened to an individual link of thechain 12. The chain 12 is led through a chain channel 13 which partly surrounds the chain 12 andencompasses it in a c-shaped manner. The conveyor 11 is designed as a plate chain conveyor,wherein the plates comprise the conveying members 1 and these plates are fastened on the chain12.A view from the front onto a part of the conveyor 11 of Figure 8 is represented in Figure9. In Figure 9, the rollers 5 are represented in the drive position, wherein the actuating means 7are positioned below the rollers 5.