Abstract:
A device for positively coupling one force transmission element with a further force transmission element includes a multi-disk clutch formed of at least four disk rings for adjusting the rotary position of the further transmission element in relation to the one force transmission element, the disk rings being axially displaceably mounted and, for both directions of rotation, having a play-free operative connection with the force transmission elements.

Description:
BACKGROUND OF THE INVENTION 
     FIELD OF THE INVENTION 
     The invention relates to a device for adjusting a rotary position of a ring gear in relation to an axially aligned gearwheel. 
     In reversing or turning devices in rotary printing machines, it has become known heretofore that the gripper devices of the reversing or turning device which grip the trailing edge of the sheet during the reversing or turning operation have to be adjusted as a function of the operating mode and of the format length to be processed. 
     For this purpose, a cylinder of the reversing or turning device has a gearwheel which is drive-connected to the preceding printing units of a first gearwheel train. The cylinder wheel carries, axially aligned, a ring gear which is drive-connected to the following printing units by a second gearwheel train. The gearwheel and the ring gear are releasably coupled to one another. 
     A device of this general type has become known heretofore, for example, from the published European Patent Document EP 0 346 619 A1, which discloses, for forcelocking or nonpositive coupling of the gearwheel and the ring gear, a multi-disk clutch, wherein a number of annular coaxially arranged disks are attached resiliently to the gearwheel and a number of annular coaxially arranged disks cooperating with the first disks are screwed resiliently to the ring gear. In this regard, it is noted that a forcelocking connection is one that connects two elements together by force external to the elements, as opposed to a formlocking connection, which is provided by the shapes of the elements themselves. 
     In the aforementioned published European Patent Document EP 0 346 619 A1, the fastening points for the disks are disclosed as being exposed to high loads in the case of high transmission forces and, therefore, having to be constructed with very high dimensioning. 
     SUMMARY OF THE INVENTION 
     It is accordingly an object of the invention to provide an alternative multi-disk clutch, which avoids the disadvantages of heretoforeknown clutches of this general type. 
     With the foregoing and other objects in view, there is thus provided, in accordance with one aspect of the invention, a device for positively coupling one force transmission element with a further force transmission element, comprising a multi-disk clutch formed of at least four disk rings for adjusting the rotary position of the further transmission element in relation to the one force transmission element, the disk rings being axially displaceably mounted and, for both directions of rotation, having a play-free operative connection with the force transmission elements. 
     In accordance with another feature of the invention, the coupling device includes a gearwheel having a journal extension and, on a seating surface in common with an adjusting gearwheel, has a receptacle for some of the disk rings, and a receptacle for others of the disk rings. 
     In accordance with a further feature of the invention, each of the disk rings has at least one driver. 
     In accordance with an additional feature of the invention, some of the drivers of the disk rings are directed radially inwardly, and some of the drivers of the disk rings are directed radially outwardly. 
     In accordance with yet another feature of the invention, the radially inwardly directed drivers engage in an axially parallel receptacle in the journal extension, and the radially outwardly directed drivers engage in an axially parallel receptacle in a ring gear. 
     In accordance with yet a further feature of the invention, some of the drivers of some of the disk rings engage in an axially parallel receptacle in the journal extension, and some of the drivers of others of the disk rings engage in the axially parallel receptacle in a ring gear. 
     In accordance with yet an added feature of the invention, others of the drivers of others of the disk rings engage in the axially parallel receptacle in the journal extension, and others of the drivers of others of the disk rings engage in the axially parallel receptacle in the ring gear. 
     In accordance with yet an additional feature of the invention, the drivers directed radially inwardly engage, respectively, in two threaded receptacles in the journal extension, and the drivers directed radially outwardly engage, respectively, in two threaded receptacles in the ring gear. 
     In accordance with still another feature of the invention, two drivers arranged opposite one another are provided for each of the disk rings, each of the two drivers having a starting slope. 
     In accordance with still a further feature of the invention, the two drivers engage in two opposite receptacles in the ring gear, and the two drivers engage in two receptacles in the journal extension. 
     In accordance with still an added feature of the invention, some of the disk rings are arranged so as to be shiftable independently of one another for a clockwise direction of rotation, and some of the disk rings are arranged so as to be shiftable independently of one another for a counterclockwise direction of rotation. 
     In accordance with still an additional feature of the invention, the coupling device includes an abutment arranged between the disk rings for clockwise rotational force transmission and the disk rings for counterclockwise rotational force transmission, and clamping devices operating independently of one another for shifting the various disk assemblies. 
     In accordance with another feature of the invention, the coupling device includes spring elements disposed in the receptacles for augmenting the bearing contact of the drivers. 
     In accordance with a further feature of the invention, the spring elements are selected from the group thereof consisting of compression springs, leaf springs, magnets, plastic material and rubber. 
     In accordance with a concomitant aspect of the invention, there is provided a reversing device of a sheet-fed rotary printing machine having installed therein a device for positively coupling one force transmission element with a further force transmission element, comprising a multi-disk clutch formed of at least four disk rings for adjusting the rotary position of the further transmission element in relation to the one force transmission element, the disk rings being axially displaceably mounted and, for both directions of rotation, having a play-free operative connection with the force transmission elements. 
     An advantage of the invention is that, due to the location of installation and type of installation of the multi-disk clutch according to the invention, positive force transmission from gearwheel to disk and from disk to ring gear is possible, even in the case of high torques. 
     To achieve reliable bearing contact (freedom from play and high torsional rigidity) of the elements involved in force transmission, provision is made for arranging axially displaceable disk rings on a journal extension of the gearwheel. These can have a great thickness, and therefore high torsional rigidity, as compared with the conventional flexible disks. Each disk ring has at least one driver which, respectively, engages in a receptacle formed, for example, as a groove. For the play-free transmission of a torque, two different disk rings are necessary for each direction of rotation, more precisely, a first disk ring with an external driver for engaging in the ring gear, and a second disk ring with an internal driver for engaging in the gearwheel or journal extension. 
     In a preferred embodiment, a number of, for example four disk rings, are arranged as an assembly for torque transmission clockwise and a number of, for example four disk rings, are arranged as a further assembly for torque transmission counterclockwise, the drivers of the disk assemblies, respectively, having to be brought into bearing contact with respective receptacles. At the same time, for the elimination of play, provision is made for arranging in the receptacles elastic spring elements which ensure that the drivers or entrainers are in constant bearing contact on the working side of the receptacle. Mechanical springs, magnets, plastic materials or rubber, and the like are preferably proposed for this purpose. In the preferred exemplary embodiment, each disk ring has three drivers which are arranged at an angle of 120° to one another, respectively, and engage with assembly play in the receptacles, in order, in addition to the transmission of a torque, to prevent a displacement of the ring gear due to the tooth forces. 
     In a further exemplary embodiment, provision is made for ensuring good reliable bearing contact, as free of play as possible, of the drivers in the receptacles by at least two receiving grooves being arranged with slight rifling, i.e., with a slight curvature in the journal receptacle or with opposite curvatures in the ring gear. This measure ensures that, during the closing of the clutch, the drivers provided for torque transmission are brought into bearing contact with the receptacles. 
     If, in a further development, the radial play is additionally to be forced out during the closing of the clutch made up of the elements transmitting rotational force, provision is made, in order to absorb the displacement forces on the ring gear, for respectively providing two receptacles per ring gear or per journal extension preferably opposite one another and for providing both the drivers and the receptacles with a radially arranged starting or run-on slope. 
     In the preferred exemplary embodiment, each disk ring has three drivers which are arranged at an angle of 120° to one another, respectively, and which engage with assembly play in the receptacles. 
     Other features which are considered as characteristic for the invention are set forth in the appended claims. 
     Although the invention is illustrated and described herein as embodied in a multi-disk clutch, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. 
     The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, wherein: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a diagrammatic side elevational view of a rotary printing machine incorporating the multi-disk clutch according to the invention; 
     FIG. 2 is an enlarged fragmentary sectional view of FIG. 1 showing the multi-disk clutch according to the invention in greater detail diagrammatically; 
     FIG. 3 is an enlarged sectional view of FIG. 2 taken along the line III—III in the direction of the arrows and showing diagrammatically a section through external and internal disks; 
     FIG. 4 a  is a sectional view of FIG. 2 taken along the line IVa—IVa in the direction of the arrows; 
     FIG. 4 b  is a sectional view of FIG. 2 taken along the line IVb—IVb in the direction of the arrows; 
     FIG. 5 is a diagrammatic perspective view of a ring gear with receptacles therein; 
     FIG. 6 is a fragmentary diagrammatic developed view of the ring gear and a journal extension; 
     FIG. 7 is a fragmentary diagrammatic sectional view of a formlocking or positive connection between an entrainer and a receptacle, it being noted in this regard that a formlocking connection is one that connects two elements together due to the shape of the elements themselves, as opposed to a forcelocking connection, which locks the elements together by force external to the elements; 
     FIG. 8 is a fragmentary diagrammatic sectional view of the positive or formlocking connection between the entrainer and the receptacle with a starting slope; and 
     FIG. 9 is a view like that of FIG. 2 showing a section through a further exemplary embodiment of the multi-disk clutch with separately shiftable clutches for movement to the lefthand side and to the righthand side. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to the drawings and, first, particularly to FIG. 1 thereof, there is shown therein a rotary printing machine, for example, a printing machine  1  for processing sheets  7 , having a feeder  2 , at least one printing unit  3  or  4  and a delivery  6 . The sheets  7  are removed from a sheet pile  8  and are fed individually or in an imbricated manner via a feeding table  9  to the printing units  3  and  4 , each of which has a plate cylinder  11 ,  12 , respectively. Each of the plate cylinders  11  and  12  has a device  13 ,  14  for fastening flexible printing plates thereon. Furthermore, to each plate cylinder  11 ,  12  there is assigned a device  16 ,  17  for semiautomatically or fully automatically changing a printing plate. 
     The sheet pile  8  lies on a pile or stack plate  10  capable of being raised in a controlled manner. The removal of the sheets  7  takes place from the upper side of the sheet pile  8  by a so-called suction head  18  which has, amongst others, a number of lifting or dragging suckers  19 ,  21  for individually separating or singling the sheets  7 . Moreover, blowing or blast devices  22  for loosening the upper sheet layers, and tracer elements  23  for pile or stack tracking are provided. A number of lateral and rear stops are provided for aligning the sheet pile  8 , in particular, the upper sheets  7  of the sheet pile  8 . 
     Between the printing units  3  and  4 , there is arranged a reversing or turning device  24  which, in the exemplary embodiment, is made up of a transfer cylinder  26 , a storage drum  27  and a reversing or turning drum  28 . The reversing or turning drum  28 , in this regard, has a driving gearwheel  29  which is in meshing engagement with the gearwheel train of the preceding cylinders. The driving gearwheel  29  carries, on a journal extension  30 , a rotatably mounted ring gear  31  which is in meshing engagement with the gearwheel train of the following cylinders and printing units, respectively. The ring gear  31  can be coupled frictionally with respect to the gearwheel  29  by a multi-disk clutch  32 . The multi-disk clutch  32  is formed mainly of a number of disk rings  33  to  36 , which are axially displaceably arranged. 
     The disk rings  33 ,  35  have at least one radially inwardly-directed driver  37 ,  38  which engages in at least one groove-shaped receptacle  39  of the journal extension  30  of the gearwheel  29 . The disk rings  34 ,  36  have at least one radially outwardly-directed driver  41 ,  42  which engages in at least one groove-shaped receptacle  43  in the ring gear  31 . The disk rings are combined in pairs or as an assembly for force transmission in one direction of rotation, for example, the disk rings  33  and  34  for a counterclockwise direction of rotation and the disk rings  35  and  36  for force transmission in a clockwise direction of rotation. 
     In an arrangement in pairs, the disk rings  33 ,  34  for counterclockwise force transmission are, respectively, in frictional contact with the disk rings  35 ,  36  for clockwise force transmission. Depending upon the construction of the clutch, the number of disk ring pairs may be increased, these being arranged alternately, i.e., for example,  33 ,  34 - 35 ,  36 - 33 ,  34 - 35 ,  36 . 
     To increase the transmission forces by an increase in the effective frictional surface, along with the same construction and number of disk rings, a packet or set-like arrangement or assembly is proposed. This results in an arrangement of the disk rings of  33 ,  34 - 33 ,  34 - 35 ,  36 - 35 ,  36 . 
     So that the multi-disk clutch  32  operates free of play, provision is made for arranging in the receptacles  39 ,  43 ,  61  to  64  spring elements  44  which keep the respective entrainer or driver  37 ,  38 ,  41 ,  42  in constant bearing contact on the force transmission side of the receptacle  39 ,  41 . The spring elements  44  which are used are magnets or compression springs or leaf springs which are supported at one end on the side located opposite from the force transmission side and at the other end on the driver or entrainer  37 ,  38 ,  41 ,  42  (rear side). Alternatively, elastic elements, such as of plastic material or rubber, may also be introduced into the space on the rear side of the driver or entrainer  37 ,  38 ,  41 ,  42 . 
     In an alternative embodiment, it is possible to dispense with the use of spring elements if two oppositely directed groove-shaped receptacles are arranged askew (in a thread-like manner) to the axis of the journal extension  30  both in the ring gear  31  and in the journal extension  30 . In this arrangement, two groove-shaped receptacles  61 ,  62  having opposite pitches are provided in the journal extension  30 , and two groove-shaped receptacles  63 ,  64  having opposite pitches are provided in the toothed ring  31 , and in this case the receptacles  61  and  63  and also  62  and  64  can be arranged in parallel. Thus, the drivers or entrainers  37  of the disk rings  33  engage in the receptacle  61  of the journal extension  30 , and the drivers or entrainers  38  of the disk rings  35  engage in the receptacle  62  of the journal extension  30 . The drivers or entrainers  41  of the disk rings  34  engage in the receptacle  64  of the toothed ring  31  and the drivers or entrainers  42  of the disk rings  36  engage in the receptacle  63  of the ring gear  31 . The receptacles  61  to  64  describe a type of rifling with very high pitch. 
     During the clamping of the multi-disk clutch  32 , an axial clamping force is applied by, for example, an hydraulically actuatable lever  46 . In this regard, the disk rings  33  to  36  are displaced axially and at the same time come automatically with the drivers or entrainers thereof into bearing contact on the force-transmitting side of the receiving grooves  61  to  64  which are arranged askew. The tensioning travel is, in this regard (from the eased to the tensioned state), so that the flanks or sides come reliably into bearing contact. 
     In a further exemplary embodiment according to FIG. 9, provision is made for arranging, between the disk assemblies  33 ,  34  for rotary transmission counterclockwise (movement to the lefthand side) and the disk assemblies  35 ,  36  for rotary transmission clockwise (movement to the righthand side), an abutment  47  which is fastened to the journal extension  30  and on which the disk assemblies come to bear when the multi-disk clutch  32  is in the closed state. A second, for example, hydraulically actuatable lever  48 , in this regard, applies the clamping force for the disk assembly  35 ,  36  which can thus be actuated separately from the disk assembly  33 ,  34  for movement to the lefthand side. 
     So that radial play, too, between the drivers  39 ,  41  and the receptacles  29 ,  31  can be eliminated during the clamping of the multi-disk clutch  32 , provision is made for each disk ring  33  to  36  to have at least two drivers or entrainers  49 ,  51  which are arranged opposite one another and have a starting slope  52 ,  53  in the radial direction. The corresponding receptacles  54 ,  56  likewise have a receiving slope  57 ,  58  adapted to the driver or entrainer slope  52 ,  53 . 
     In a further preferred embodiment, provision is made for each disk ring  33  to  36  to have, respectively, three drivers or entrainers  37 ,  38  which are arranged at an angle of 120° to one another and which are mounted so as to be axially movable, respectively, with small play, between the driver or entrainer  37 ,  38  and the receptacles  39 ,  43 . 
     During the closing or clamping of the multi-disk clutch  32 , the disk rings  33  to  36  are displaced in the receiving grooves as a result of axial force action, until the disk rings come into frictional contact with the disk rings adjacent thereto, respectively. Due to the obliquely running receiving grooves, the drivers or entrainers come into working contact with the working side of the receptacles in the circumferential direction. Due to the starting slopes, radial play between the drivers or entrainers and the receptacles is forced out by the direction of rotation of the disk rings produced in the circumferential direction. In an arrangement of the drivers or entrainers with a phase offset of 120°, no radial play occurs.