FIELD OF THE INVENTION 
     The present invention relates to a roller for a rotary printing press. The roller is connected by a coupler to a drive mechanism in an eccentric fashion. 
     DESCRIPTION OF THE PRIOR ART 
     An arrangement for the axial back-and-forth movement of an ink roller and having a device for changing the axial lift is disclosed in DE-PS 12 40 888. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is directed to creating a roller which can be reciprocally moved in the axial direction. 
     In accordance with the present invention, this object is attained by the provision of a roller which is connected to a drive mechanism by a coupler. The coupler is hingedly seated and is connected eccentrically with the drive mechanism. The number of revolutions of the drive, and the number of revolutions of the roller can be changed in relation to each other. 
     The advantages which can be achieved by the present invention lie, in particular, in that the lift frequency and/or the lift length can be selectively set during the operation. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     A preferred embodiment of the present invention is represented in the sole drawing FIGURE and will be described in greater detail in what follows. 
     The sole drawing FIGURE represents a schematic lateral view of the reciprocally movable roller with its lifting drive mechanism in accordance with the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Both roller journals  03  of a driveable roller  02 , for example a friction roller, are rotatably and axially displaceably arranged in two lateral frames  01 . Only one lateral frame  01  is shown in the drawing. The desired lift or lateral displacement ±h of, for example ±25 mm in a direction of the axis of rotation  06  of the roller  02 , can be set either in steps or in an infinitely variable manner. 
     Bearings  04 , for example sliding bearings, are provided in bores in the lateral frames  01  for seating and slidably supporting the roller journals  03 . 
     A journal joint  19 , for example with a play or degrees of freedom, “f” of “f”=4, is attached, in the area of the axis of rotation  06  of the roller journal,  03  to the end of one of the roller journals  03 , for example at a front face  05  of the end of the roller journal  03 . The journal joint  19  is embodied, for example, as a traction- and shear- resistant ball tube joint. The spherical gudgeon  09  of joint  19  is attached at the front face  05  of the journal  03 , and the spherical liner  10  of joint  19  is attached at a first end  07  of a bending-resistant coupling rod  08 . 
     A spherical liner  21  is attached at a second end  22  of the bending-resistant coupling rod  08 . 
     A drive joint  11 , for example with a play or degrees of freedom “f” of “f”=4, is provided at an outer end  12  of a rotatable, drive member such as a driveable one-armed drive lever  13 , or at an outer end of a radius of a drive disk. The drive joint  11  is embodied, for example, as a traction- and shear-resistant ball tube joint. Its spherical gudgeon  15  is seated on the outer end  12  of the drive lever  13  and is interlockingly connected with the spherical liner  21 . 
     An inner end  25  of the drive lever  13  is fastened, fixed against relative rotation, on a shaft  18  of a drive mechanism  23 . Shaft  18  rotates around its axis of rotation  27 . Drive mechanism  23  may be, for example, an rpm- controlled electric motor  23 . In this case, the shaft  18  can be the driveshaft of an electric motor  23 . 
     The axes of rotation  06  of the roller  02  and  27  of the electric motor  23  can be aligned with each other in such a way that, in a first extreme case, they coincide, and in a second extreme case they enclose an angle α, of, for example, 30°. The angle α can be set in steps or in an infinitely variable manner and can be maintained in a desired position. 
     Setting of the angle a can take place directly by tilting the drive mechanism, the drive motor  23  in the preferred embodiment. To this end, feet are provided, for example on the bottom of the drive motor  23 , at the front near the driveshaft  18 . These feet are fastened on a rocker  24 . The rocker  24  is pivotably connected with the lateral frame  01  by means of a link, for example a hinge  26  with a degree of freedom “f”=1. The members of the hinge  26  are interlockingly connected in such a way that lateral tilting in the course of their force transmission is not possible. 
     Moreover, a rear, or remote from the driveshaft, bearing  31  in the form of an eye is provided on the bottom of the drive motor  23 , which rear bearing  31  is hingedly connected with a fork head  14  of a linear drive mechanism  28 . 
     The linear drive mechanism  28  can consist, for example, of a threaded spindle  29 , which can be driven in either of its two directions manually or by a motor and whose upper end is rotatably joined to the fork head  14 . The thread of the threaded spindle  29  is in engagement with an inner thread of a threaded nut  20 . The threaded nut  20  is fastened in a nut holder  32  fixed in place on the lateral frame  01 . 
     Pivoting of the drive mechanism  23 , and therefore of the drive element - i.e. the one-armed lever  13  -, in the desired direction takes place by an appropriate actuation of the linear drive mechanism  28 . If the threaded spindle  29  is turned to the left or to the right, the rear end of the drive mechanism  23  is raised or lowered, and the one-armed lever  13  is also pivoted because of this. The one-armed lever exerts pressure or traction on the coupling rod  08 , and therefore on the roller journal  03 . 
     Thus, turning the threaded spindle  29  results in a corresponding change of the lift or the lateral displacement h of the roller journal  03  and of the roller  02 . 
     The lift or lateral displacement ±h becomes zero as soon as the drive  23  is no longer operating or the angle a equals zero. 
     The lever  13  can be embodied as a one-armed lever  33  or as a two-armed lever  34 , as depicted in dashed lines in the sole drawing figure. An outboard end of the second or free end of the two-armed lever  34  can be provided with a compensating weight  38 . It is also possible to provide a rotating disk in place of the lever  13 . 
     The drive mechanism  23 , for example an electric motor, is designed as an rpm-controlled or regulated drive mechanism for being able to set the lift or the lateral displacement frequency. If the number of revolutions of the drive mechanism  23  is increased, the lift frequency is proportionally increased is reduced, the lift frequency is reduced proportionally with it. If the drive mechanism  23  is switched off, the friction roller  02  no longer performs a lift; i.e. it no longer moves laterally along its axis of rotation. 
     In accordance with one variation, it becomes additionally possible to arrange an energy storage device, for example a compression spring  40  between the lateral frame  01  and a right end face of the friction roller  02 . Because of this, the coupling rod  08  is only stressed by traction. This occurs when the friction roller  02  moves from the left to the right, as shown in the drawing, and the compression spring  40  is compressed in the process. With a subsequent movement of the friction roller from the right to the left, the compression spring relaxes again and releases its stored energy. 
     It is also possible to arrange a compression spring between a left front face of the friction roller  02  and a left lateral frame. This results in the coupling rod  08  only being stressed by pressure. 
     While a preferred embodiment of a roller in accordance with the present invention has been set forth fully and completely hereinabove, it will be apparent to one of skill in the art that various changes in, for example the overall size of the roller, the specific type of sliding bearing used, and the like can be made without departing from the true spirit and scope of the present invention which is accordingly to be limited only by the following claims.
A friction roller is connected, in an articulated manner, in the area of its axis of rotation, to one end of a connecting rod. The second end of this connecting rod is connected, in an articulating manner, to a peripheral portion of a rotatable lever that can be driven. A rotational axis of the lever is situated at an angle with respect to the rotational axis of the friction roller.