Abstract:
A device for holding at least one roller of a rolling machine that can rotate about a rotational axis includes two holding arrangements that can be arranged on opposite faces of the roller viewed in the direction of the rotational axis. The device further includes at least two coupling parts each configured for a coupled mode and an uncoupled mode. A first of the two coupling parts has at least one, preferably essentially straight first groove, and has a second groove that does not run parallel to the first groove. A second of the two coupling parts includes a first coupling element and a second coupling element, wherein the first coupling element projects further outward from the second coupling part than the second coupling element. In at least one implementation, the roller can be detached or removed from the holding arrangements when the holding arrangements are in uncoupled mode.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application claims the benefit of priority under 35 U.S.C. § 119 to German Patent Application No. 103 17 312.9 in accordance with the Paris Convention for the Protection of Industrial Property (613 O.G. 23, 53 Stat. 1748); which was filed in the German Patent and Trade Mark office on Apr. 14, 2003, entitled “Vorrichtung zum Halten Wenigstens einer Walze einer Walzmaschine”, the application of which is incorporated herein by reference in its entirety. 
   BACKGROUND OF THE INVENTION 
   1. The Field of the Invention 
   The invention relates to a device for holding at least one roller of a rolling machine and a rolling machine. 
   2. The Relevant Technology 
   Rolling methods that involve compressive forming are among many methods that are used in forming work pieces from an initial shape into a desired intermediate shape (semi-finished product, pre-forming) or final shape (end product, final forming). In the rolling process, the work piece (rolling stock) is arranged between two rotating rollers, and subjected to a forming pressure exerted by the rotating rollers to alter its shape. In the roll forming method, work piece sections are arranged on the periphery of the rollers, which enable the generation of corresponding profiles in the work piece. In flat rolling, the cylindrical or conical outer surfaces of the rollers act directly on the work piece. 
   In terms of the relative movement of tools or rollers on the one hand, and the work piece on the other, rolling methods are divided into “longitudinal rolling”, “transverse rolling” and “cross rolling”. In longitudinal rolling, the work piece is moved through a gap between the rollers (roller gap) that is perpendicular to the rotational axes of the rollers in a translational motion, most often without rotating. In transverse rolling, the work piece does not move in a translational motion, relative to the rollers or their rotational axes, but rather turns only around its own axis. Its own axis is a principal axis of inertia, such that the principal axis of inertia is a symmetrical axis, given a rotationally symmetrical work piece. The combination of both types of movement involved in longitudinal and transverse rolling is referred to as “cross rolling”. The rollers are here generally slanted relative to each other such that the work piece is moved translationally and rotationally. 
   Grooved cross rolling machines typically include two rollers with wedge-shaped profiled tools, and are arranged on the rolling machines&#39; outer periphery. The two rollers rotate in the same direction about parallel rotational axes, and are sometimes also referred to as “cross wedge rollers”. The profiled tools have a wedge-shaped or triangular (at the cross-section) geometry as their axial dimensions along the periphery either increase in one direction and/or run slanted to the rotational axis of the rollers. 
   These cross wedge rollers, or grooved cross rollers, enable a versatile forming of work pieces within high precision, and dimensional accuracy. The wedge-shaped tools can produce continuous grooves and other tapers in the rotating work piece. Axial shifts in the peripheral direction, or a slanting of tool wedges relative to the rotational axis, make it possible to generate changing structures and tapers in the work piece axially with respect to the rotational axis, for example. Increasing or decreasing the outer diameter of the tool wedge while proceeding around the rotational axis makes it possible, in combination with the slanted arrangement, to generate axially-running slants and continuous transitions between two tapers of varying diameter in the work piece. Cross wedge rollers are particularly suited for manufacturing elongated, rotationally symmetrical work pieces with constrictions or elevations, such as with cams or ribs. 
   German Patent Application No. DE 1 477 088 C describes a cross wedge rolling machine for transversely rolling rotational solids or flat work pieces with two working rollers rotating in the same rotational direction, whose rolling surfaces accommodate exchangeable wedge tools. The wedge tools each have wedge-shaped (or triangular) reduction strips that ascend from the roller jacket to an end height tailored to the work piece to be manufactured, and are roughened such as by knurling, along with wedge-shaped, smooth forming surfaces with a calibration effect spaced identically apart from the roller jacket. The wedge tools are designed as deformation segments, and only traverse a partial area of the accompanying roller surface. The facing surfaces and tools of the two working rollers move or rotate in an opposite direction relative to each other on the work piece. 
   German Patent Application No. DE 39 26 356 C2 describes a rolling machine with exchangeable working rollers. Each of the working rollers is provided on one face with a cylindrical tap mounted on a divided clamping element of a drive shaft, wherein a movable clamping part of the clamping element is connected with a fixed clamping part at least by one screw and one nut. The opposing face of each working roller exhibits a cylindrical tap mounted on a divided clamping element of the thrust cylinder, whose moveable clamping part is again connected with a fixed clamping part by means of at least one screw and one nut. The working shaft is made to rotate by a drive via the drive shaft. The accompanying clamping element and mounted cylindrical tap impart the active torque from the drive shaft to the roller. 
   German Patent Application No. DE 309 408 C discloses the mount for a typewriter plate. 
   German Patent Application No. DE 891 642 C discloses a roller mounting plate for a rolling machine. In this known rolling machine, each bearing journal has a coupling flange on the roller stand into which a centering shoulder of the roller body can be inserted without one or both bearing journals axially shifting. The coupling flange can be designed as a pocket, in which the centering shoulder of the roller body is inserted and held in place by an end cap. Bolts or screws can be provided for securing the centering shoulder and coupling flanges to each other. 
   Accordingly, an advantage in the art can be realized with systems and methods that provide a simple and reliable mount for the roller of a rolling machine, and that provide a corresponding rolling machine for implementing the same. 
   BRIEF SUMMARY OF THE INVENTION 
   Implementations of the present invention provide a simple and reliable mount for a roller of a rolling machine. 
   Implementations of the present invention are achieved according to the invention by a device with the features in claim  1 . The device according to claim  1  is suited and intended for holding at least one roller of a rolling machine that canes rotate around a rotational axis, and encompasses two holding arrangements that can be arranged on opposing faces of the roller, (when viewed in the direction of the rotational axis), and at least two holding arrangements that have both a coupled mode (e.g., a power or torque-transmitting mode) for the torque-transmitting linkage of each holding arrangement with the roller and an uncoupled mode (e.g., no-power or torque mode). 
   The holding arrangements have at least two paired couplings each comprising at least a first groove as well as at least one corresponding first coupling element on the one hand, and at least one second groove not running parallel to the first groove as well as at least one corresponding second coupling element on the other. The first and second groove(s) are formed on a first coupling part, and the first and second coupling elements are formed on a second coupling part of the respective coupling arrangement. 
   When the coupling arrangement is in coupled mode, the two accompanying nut and coupling element pairs of each coupling arrangement are now engaged, wherein at least the pairing comprised of the second groove(s) and second coupling element(s) are positively engaged. As a result, the rotational motion and torque are synchronously imparted to the roller when at least one of the holding arrangements is turned over the joining surfaces of the coupling arrangement having the active positive fit. At the same time, the roller is prevented from dropping out of the position between the holding arrangements. 
   In order to replace the roller or equip it with new tools, the roller mount between the holding arrangements is detachable in design. To this end, the roller can be removed from the holding arrangements with the holding arrangements uncoupled. 
   The rolling machine according to the invention encompasses at least two rollers that can rotate around a respective rotational axis, and in particular can be equipped with tools: at least one rotational drive for rotating the rollers, when forming a work piece that is arranged between the rollers, and a device according for holding the rollers. 
   The term “forming” as understood herein refers to changing the shape of a work piece into another shape in any way, and including “pre-forming” and “final forming”. The rotational axes of the rollers are to be viewed as geometrical or mathematical axes in a Euclidean, three-dimensional space, around which the rollers turn. By contrast, power-transmitting or mechanical axes are referred to as “shafts” in this application. 
   The respective claims depending from claim  1  and claim  34  describe advantageous embodiments and further developments of the device, along with aspects of the rolling machine. 
   In general, the first grooves, and preferably the second grooves as well are each formed on a groove base. In a preferred embodiment, the first groove is embedded more deeply than the second groove in each first coupling part of the holding arrangements (alternatively, the groove base is arranged further down), so that the first coupling element does not hit the groove base of the first base when the second coupling element positively engages the second groove. In addition, the coupling elements generally do not abut the groove base of the accompanying grooves when the holding arrangements are coupled, thereby avoiding a geometric correlation. As an alternative, the first grooves and second grooves of the holding arrangements can be downwardly and partially open (i.e., slit-like in design). 
   The first coupling element of the accompanying second coupling part also positively engages the first groove of the accompanying first coupling part with each of the holding arrangements coupled to additionally stabilize the connection. 
   The first groove and second groove of the first coupling part of each coupling arrangement are preferably arranged orthogonally relative to each other. This enables an optimal power transmission and mounting in the coupled mode. 
   The first grooves of the first coupling parts and preferably the second grooves of the first coupling parts are generally continuous in design. However, the second coupling part can encompass at least two respectively separated first coupling elements and two separated second coupling elements, which preferably are arranged on various sides of the rotational axis, and then in particular are separated from each other by a central area around the rotational axis. 
   The first and second grooves of the first coupling parts, as well as the first and second coupling elements of the second coupling parts each preferably run radially to the rotational axis when the respective coupling arrangement is coupled. 
   The side walls of the second grooves and the second coupling elements, and also of the first grooves and first coupling elements, to be positively interlocked, are essentially perpendicular and/or flat in design in order to form a good opposite surface of force for the positive fit. 
   The first grooves are preferably used as guide grooves when assembling or disassembling the rollers. In one embodiment, the first grooves are essentially straight or linear in design. In particular, the first grooves of the first coupling parts are outwardly open at their ends, in order to introduce the first coupling elements along the groove. In addition, the first grooves can outwardly expand at least at one of their open ends and form guide surfaces for the first coupling element to be introduced. Accordingly, the first coupling element can also be tapered at one of its corresponding free ends that correspond or slide thereupon to interface with the guide surfaces of the first groove. 
   In order to linearly introduce or remove the roller, the first grooves of the first coupling parts of the two holding arrangements are preferably oriented or adjustable essentially parallel to each other. 
   In order to switch or alternate between the coupled and uncoupled modes of the holding arrangements, at least one positioning arrangement is provided for positioning at least one of the two holding arrangements axially to the rotational axis of the roller, moving them toward each other and away from each other. 
   The roller can be mounted between the two holding arrangements by moving the roller into a position between the two holding arrangements parallel to the first grooves in a first step with the holding arrangements uncoupled while guiding the first coupling elements in the first grooves of the first coupling parts of both holding arrangements, after which the accompanying holding arrangements are switched to the coupled mode in a second step by feeding at least one of the two holding arrangements to the roller. The roller is then reliably held between the holding arrangements. Proceeding in an opposite manner, the roller is disassembled from the holding arrangements by initially moving the two holding arrangements from their coupled mode to their uncoupled mode by moving at least one of the two holding arrangements away from the roller, after which the roller is moved into a position outside the two holding arrangements while guiding the first coupling elements in a removal direction, or a direction running parallel to the first grove. This simple assembly and disassembly capability is a particular advantage of the invention. 
   Stop surfaces, which abut each other when the holding arrangements are in couple mode, are arranged or secured on the holding arrangements. In addition the rollers&#39; front sides face each other in order to limit the feeding motion, and to fix the roller in place between the holding arrangements. 
   In an additional implementation, positioning means are provided for positioning the roller relative to the holding arrangements in a position where the two holding arrangements can be switched from the uncoupled to coupled mode and vice versa. These positioning means are preferably formed with corresponding stop means, which retain or stop the rollers in the direction of introduction. In particular, this position makes it possible to feed the holding arrangements to the roller, for switching the coupling arrangement to its coupled mode, and/or to introduce the second coupling element of the accompanying second coupling part into the second groove of the accompanying first coupling part. In particular, the positioning means can encompass positioning elements that intermesh from the back. In addition, the positioning means are generally designed in such a way as to enable or not impede the feeding motion of the holding arrangements relative to the roller. 
   The device further includes apparatus configured for holding at least two rollers of a rolling machine that can rotate around a rotational axis, and then encompasses a respective two holding arrangements and a respective two holding arrangements for each of the rollers. The holding arrangements and rollers can be arranged next to each other when assembled, or arranged one over the other viewed in the direction of gravitational force. 
   At least two rollers can preferably be mounted sequentially in the same direction of introduction or from the same side of the rolling machine and/or the first roller to be mounted can be guided between the holding arrangements of the rollers to be subsequently mounted. 
   The positioning means are now preferably designed and arranged on the rollers and holding arrangements in such a way that the roller to be mounted first can be guided between the holding arrangements of the rollers to be subsequently mounted, and is or can be positioned only in its desired location between the accompanying holding arrangements of this roller. In particular, in the case of the roller to be introduced or mounted first, the positioning means or stop means are for this purpose arranged at the end of the holding arrangement viewed in the direction of introduction, and at the front side of the roller on their faces or sides viewed in the direction of introduction, and the positioning means or stop means of a second roller to be mounted after the first roller are arranged at the beginning of the holding arrangement viewed in the direction of introduction, and on the faces or sides of the roller on the back side viewed in the direction of introduction. 
   A special embodiment now makes it possible to incorporate at least two rollers between the accompanying holding devices in an unmistakable or clearly allocated fashion, in particular via the configuration of the accompanying holding arrangements and/or the accompanying positioning means. 
   The rolling machine generally encompasses bearing arrangements for each holding arrangement, in which the holding arrangements are rotationally supported. 
   The rotational axes of the rollers mounted in the holding arrangements are generally oriented essentially parallel to each other and/or essentially arranged over each other viewed in the direction of gravitational force and/or essentially perpendicular to the direction of gravitational force. 
   In a particularly preferred embodiment, the rolling machine is designed as a grooved cross-rolling machine or cross wedge rolling machine, whose basic structural design was described at the outset. In particular, the rollers exhibit profiled or wedge-shaped tools, and rotate in the same direction toward each other, wherein the work piece only rotates around its own axis, and is not translationally transported by the rollers, as opposed to longitudinal rollers. The tools on the rollers are wedge-shaped or triangular, in particular in terms of their cross section, and increase in radial dimensions in one direction along the periphery and/or run slanted relative to the rotational axis of the accompanying roller. 
   These and other objects and features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by the practice of the invention as set forth hereinafter. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     To further clarify the above and other advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which: 
       FIG. 1  is a device for holding two rollers of a rolling machine situated one over the other, longitudinal section; 
       FIG. 2  is a front view of the face of a holding arrangement for the upper roller according to  FIG. 1 , including a coupling part with coupling elements; 
       FIG. 3  is a front view of the face of the upper roller according to  FIG. 1 , including a coupling part with coupling grooves; 
       FIG. 4  is a front view of the face of a holding arrangement for the lower roller according to  FIG. 1 , including a coupling part with coupling elements; 
       FIG. 5  is a front view of the face of the lower roller according to  FIG. 1 , including a coupling part with coupling grooves; 
       FIG. 6  is a three-dimensional view of a second coupling part with four radial coupling elements; 
       FIG. 7  is a three-dimensional view of a first coupling part corresponding to the second coupling part according to  FIG. 6 , with two radial coupling grooves; 
       FIG. 8  is a three-dimensional view of the first coupling part according to  FIG. 7  and the second coupling part according to  FIG. 6  just prior to radial introduction; 
       FIG. 9  is a three-dimensional view of the first coupling part according to  FIG. 7  and the second coupling part according to  FIG. 6  after introduced and just prior to coupling; 
       FIG. 10  is a three-dimensional view of the first coupling part according to  FIG. 7  and the second coupling part according to  FIG. 6  after coupling; and 
       FIG. 11  is a three-dimensional view, rotated by 180° relative to the view in  FIG. 10 , of the first coupling part according to  FIG. 7  and the second coupling part according to  FIG. 6  after coupling. 
   

   Identical parts and dimensions in  FIGS. 1 to 11  are denoted with the same reference symbols. 
   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The device shown in  FIG. 1  illustrates holding two working rollers  2  and  3 , and part of a rolling machine. In particular,  FIG. 1  illustrates a cross wedge roller, or cross wedge rolling machine. 
   The first working roller  2  rotates around a rotational axis A, and the second working roller  3  rotates around a rotational axis B. The rotational axes A and B are essentially arranged parallel to each other or perpendicular to the direction of the forces of gravity (or earth&#39;s attraction) denoted with the arrow, so that both working rollers  2  and  3  are arranged one right over the other. 
   The working rollers exhibit an essentially cylindrical outer surface. Segmented or fully continuous tools each having a wedge-shaped cross section (not shown) are generally secured, in particular braced or bolted, to the outer surface or jacket surface of the working rollers  2  and  3 , and each are slanted and arranged at an angle relative to the respective rotational axis A and B and axially arranged relative to the rotational axes A and B in essentially the same positions. Viewed in the peripheral direction, the tools advantageously also increase in cross section, wherein the increase in cross section proceeds in a direction opposite to the tools of different working rollers  2  and  3 . 
   The left face  20  of the first, upper working roller  2  in  FIG. 1  is provided with a flange-like first coupling part  6 A of a coupling arrangement  6 , while the other, right face  21  is provided with a flange-like first coupling part  7 A of a coupling arrangement  7 . The left face  30  of the second, lower working roller  3  in  FIG. 1  is also provided with a flange-like first coupling part  8 A of a coupling arrangement  8 , and the other, right side  31  is provided with a flange-like first coupling part  9 A of a coupling arrangement  9 . In addition to the first coupling parts  6 A,  7 A,  8 A and  9 A, the holding arrangements  6  to  9  each encompass respectively corresponding, also flange-like second coupling parts  6 B,  7 B,  8 B and  9 B, which are arranged or formed on a respective accompanying holding arrangement  12 ,  13 ,  14  and  15  designed as a rotating shaft. 
   The holding arrangements  12  and  13  for the upper working roller  2  are rotationally supported in accompanying bearing arrangements  16  and  17  around rotational axis A by means of roller bearings (not designated in any greater detail). The holding arrangements  14  and  15  for the lower working roller  3  are rotationally supported in accompanying bearing arrangements  18  and  19  around rotational axis B by means of roller bearings (not designated in any greater detail). The holding arrangement  12  of the first working roller  2  and the holding arrangement  14  of the second working roller  3  each exhibit a shaft extension as a drive shaft  42  or  43 , which can each be connected or coupled with one or a shared rotational drive (not shown). 
   The holding arrangements  6  to  9  are coupled in  FIG. 1 , i.e., their coupling parts  6 A and  6 B,  7 A and  7 B,  8 A and  8 B as well as  9 A and  9 B intermesh. As a result, the upper first working roller  2  and the lower second working roller  3  are clamped or held between the accompanying holding arrangements  12  and  13  or  14  and  15  axially to their respective rotational axis A or B on the one hand, and torques or rotations of the holding arrangements  12  and  14  are conveyed synchronously via drive shafts  42  and  43  to the working rollers  2  and  3  and the opposing holding arrangements  13  and  15  on the other. 
   Each of the working rollers  2  and  3  can now be removed from the holding arrangements  12  and  13  or  14  and  15  by uncoupling the accompanying holding arrangements  6  and  7  or  8  and  9 , and taken out of the arrangement for purposes of replacing the tools or all working rollers  2  and  3 . 
   The structural design and function and the holding arrangements  6  to  9  will be explained in greater detail by way of example based on the holding arrangements  6  and  8  along with  FIG. 2 to 11 . 
     FIG. 2  and  FIG. 6  show the second coupling part  6 B or  7 B, and  FIG. 3  and  FIG. 7  show the first coupling part  6 A or  7 A of the coupling arrangement  6  or  7  for the upper working roller  2 .  FIG. 4  shows the second coupling part  8 B, and  FIG. 5  shows the first coupling part  8 A of the coupling arrangement  8  for the lower working roller  3 .  FIG. 8 and 11  further illustrate the two coupling parts  6 A and  6 B in varying positions. Both coupling parts  6 A and  6 B have the basic shape of a cylinder, with rotational axis A as the cylindrical axis. Coupling arrangement  7  is structurally identical to coupling arrangement  6 , while coupling arrangement  9  is structurally identical to coupling arrangement  8 , as highlighted by the corresponding reference numbers placed in parentheses. 
   Two continuous grooves  60 / 80  and  61 / 81  intersecting in the area of rotational axis A or B and oriented orthogonally relative to each other and radially to the rotational axis A or B are provided in the first coupling part  6   a  or  8 A, and exhibit at least primarily a rectangular cross section or straight, perpendicular side walls. The first groove  60  or  80  is deeper or displaced further inward than the second groove  61  or  81 . 
   The second coupling part  6 B or  8 B exhibits four radially running coupling elements  62 ,  63 ,  64  and  65  (or  82 ,  83 ,  84 , and  85 ) protruding or projecting axially to the rotational axis, which are offset by 90° relative to each other, and separated from each other in the area of rotational axis A or B by a central intermediate space. The coupling elements  62  and  64  or  82  and  84  are provided and designed for engaging the first groove  60  or  80  of the first coupling part  6 A or  8 A, and the coupling elements  63  and  65  or  83  and  85  for engaging the second groove  61  or  81 . The coupling elements  62  and  64  or  82  and  84  are here higher or designed to project further than the coupling elements  63  and  65  or  83  and  85 . 
   The first grooves, e.g.,  60  and  80 , and the accompanying coupling elements, e.g.,  62  and  64  or  82  and  84 , of all holding arrangements  6  to  9  are oriented vertically or parallel to the gravitational force G, and the second grooves, e.g.,  61  and  81 , and the accompanying coupling elements, e.g.,  63  and  65  and  83  and  85 , are correspondingly oriented horizontal or perpendicular to the gravitational force G. 
   The bearing arrangements  17  and  19  now each have two bearing parts  17 A and  17 B or  19 A and  19 B, which can each be moved or adjusted relative to each other between two set positions axially or parallel to the rotational axis A or B and fixed in the set positions. This creates a setting arrangement for axially feeding or removing the holding arrangement  13  or  15  axially fixed in the bearing part  17 A to or from the working roller  2  or  3 . The setting arrangement can also encompass a drive for automatic feeding or removal. 
   The upper edge of the second coupling part  6 B of the coupling arrangement  6  exhibits a cut-off area for the upper working roller  2 , in which the coupling element  62  protrudes upwardly and narrows, forming guide surfaces. The protruding area of the coupling element  62  and the cut-off upper edge of the second coupling part  6 B together comprise a positioning element  66 . The upper edge of the first coupling part  6 A has a loop-shaped receptacle for the positioning element  66  of the coupling element  62 , which forms an additional positioning element  67  and also sits on the cut-off area of the second coupling part  6 B if the cylindrical axes of the coupling parts  6 A and  6 B coincide on rotational axis A. 
   The lower edge of the first coupling part  8 A of the coupling arrangement  8  for the lower working roller  3  exhibits a cut-off area with a hook-shaped extension as the positioning element  86 . The lower edge of the second coupling part  8 B also exhibits a hook-shaped extension as the positioning element  87 , wherein the two hook-shaped positioning elements  86  and  87  intermesh from the back and abut each other if the cylindrical axes of the two coupling parts  8 A and  8 B coincide on rotational axis B. 
   In order to assemble working rollers  2  and  3 , the accompanying bearing parts  17 A or  19 A along with the accompanying holding arrangements  13  or  15  are first moved out to the outer set position as appropriate. The lower working roller  3  with its two first coupling parts  8 A and  9 A can be initially guided from above between the sufficiently spaced two upper holding arrangements  12  and  13  and the coupling parts  6 B and  7 B. The design of the positioning elements  87  and  97  on the one hand, and of the positioning elements  66  and  76  on the other, ensures that the lower working roller  3  can pass the upper holding arrangements  12  and  13 . 
   The working roller  3  with the first grooves  80  and  90  is subsequently threaded in the vertical insertion direction E (i.e., oriented parallel to the gravitational force G) over or on the coupling elements  82  and  92 , as shown in  FIG. 8  for coupling arrangement  6 . A narrowed section at the beginning of the coupling element  82  and  92  and an expanded section  89  or  99  at the lower entrance of the groove  80  or  90  here serve as guides or stop faces or lacing aids. The grooves  80  and  90  are now guided onto the coupling elements  82  and  92 , and then on the coupling elements  84  and  94  of the second coupling parts  8 B and  9 B, until the positioning elements  87  and  97  of the working rollers  2  and  3  hit the accompanying positioning elements  86  and  96  of the lower holding arrangements  14  and  15 . The set positions of the holding arrangements  14  and  15  are here selected in such a way that the coupling elements  82  and  84  as well as  92  and  94  engage the respective guiding grooves  80  and  90  on either side, and are guided by longitudinally running side walls. The two coupling parts  8 A and  8 B as well as  9 A and  9 B are arranged concentrically to rotational axis B in the end position of the working roller  3  defined by the positioning elements  86 ,  87 ,  96  and  97  when hooked together. 
   The transversely running coupling elements  83  and  85  as well as  93  and  95  are now engaged in the transversely running second grooves  81  and  91  by axially feeding the holding arrangement  15  in forward direction Z coaxially to the rotational axis B (as shown in  FIG. 9  for coupling arrangement  6 ). The shape of coupling elements  82  to  85  as well as  92  to  95  can be adjusted to the grooves  80  and  81  as well as  90  and  91  in such a way as to generate a positive fit at least on the longitudinally running side walls during this engagement. The mutually abutting flat sides or stop surfaces  52  and  53  or  56  and  57  of the coupling parts  8 B and  8 A or  9 B and  9 A limit this feeding movement before the coupling elements  82  to  85  as well as  92  to  95  hit the groove base of the respective grooves  80  and  81  as well as  90  and  91 . The two holding arrangements  8  and  9  are now coupled, and a stable, torque-transmitting connection is realized between the working roller  3  and holding arrangements  14  and  15 . 
   In addition to the lower expansions  89  and  99 , the first grooves  80  and  90  also exhibit upper expansions  88  and  98 . This is advantageous when guiding the lower working roller  3  with its grooves  80  and  90  on the coupling elements  62  and  64  and  72  and  74  of the upper coupling parts  6 B and  7 B as it passes between the upper holding arrangements  12  and  13 , since this facilitates both upward and downward lacing. All grooves can also be contacted at the upper edge (see  FIG. 7 ). 
   Following this assembly of the lower working roller  3 , the upper working roller is mounted in similar fashion in an initial step by lacing or fitting it from above with the first grooves  60  and  70  of its first coupling parts  6 A and  7 A on the coupling elements  62  or  72  in the direction of introduction E ( FIG. 8 ). In this case, the narrowing area of the coupling element  62 , which is part of the positioning element  66 , and an outwardly enlarging expansion  68  at the beginning of the first groove  60  serve as lacing aids or guides. 
   After lacing is completed, the grooves  60  and  70  are further guided on the coupling elements  62  and  72  and then on the coupling elements  64  and  74  up to the end position defined by the stop of the positioning elements  66 / 76  and  67 / 77 , in which axial feeding in the forward direction Z takes place for positively joining the two grooves  61  and  71  with the accompanying coupling elements  63  and  65  or  73  and  75  ( FIG. 9 ). 
     FIGS. 10 and 11  show the coupling arrangement  6  coupled in this way. The frontal stop surfaces  50  of the second coupling part  6 B and frontal stop surfaces  51  of the first coupling part  6 A are situated one on top of the other, and the coupling elements  62  and  64  positively engage the groove  60  at a distance from the groove base, while coupling elements  63  and  65  engage the groove  61 . 
   The steps mentioned for assembly are performed in reverse order to remove or disassemble the working rollers  2  and  3  in removal direction opposite the advancing direction Z and a withdrawal direction opposite the direction of introduction E. 
   The faces of the working rollers  2  and  3  each are provided with upper assembly aids  22  and  23  or  32  and  33 , so that they can be held during assembly or disassembly. 
   The described measures have hence been used to easily switch or replace the working rollers  2  and  3  or their tools, and also to reversibly (or irreversibly) incorporate the two working rollers  2  and  3  given the special design of the positioning means  66 ,  67 ,  76 ,  77 ,  86 ,  87  and  96 ,  97 . 
   The coupling parts are preferably made out of steel. The coupling elements can in particular be secured as prefabricated parts in grooves in a second coupling part, e.g., as shown in  FIG. 8 , or also be molded onto or out of the coupling part itself. 
   The grooves in the first or second coupling part are preferably generated via material degradation, in particular milling. 
   The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.