Abstract:
Devices for accomplishing the alignment of a covering applied to a cylinder in a printing machine include a detent and a roller element. The detent is situated in a mounting direction of the covering and is upstream of the roller element. The covering to be applied engages with the detent. In an alternative configuration, the roller can itself act as the detent. A method for aligning or for mounting the covering on the cylinder utilizes the detent or the roller element.

Description:
FIELD OF THE INVENTION 
   The present invention is directed to devices and to methods for aligning or mounting a dressing applied to a cylinder of a printing press. At least one detent and at least one rolling element can be used. The detent is situated upstream of the rolling element. 
   BACKGROUND OF THE INVENTION 
   A device for mounting and for removing at least one dressing on or from a cylinder of a printing press with the aid of several rollers arranged along the cylinder is known from DE 100 24 329 A1. A detent, which is arranged fixed in place and spaced apart from the cylinder, aids the exact application of the leading end of the dressing by the use of a bevel which is facing the cylinder. Furthermore, one or several rollers, which are located upstream in the mounting direction, are pivotable and can be placed against the cylinder. In accordance with one preferred embodiment, a beveled end of a printing forme rests on the cylinder, viewed in the production direction of the cylinder, in front of a groove opening, while this end contacts the groove. The introduction of a suspension leg formed on the leading end of the dressing into an opening on the cylinder cannot be effectively aided by this prior device. 
   A device for changing of printing formes on rotary printing presses is known from EP 0 678 383 A1. A printing forme, which has been removed from a forme cylinder, after its complete removal from the forme cylinder, temporarily rests with its beveled front edge against a contact pressure roller placed against the forme cylinder. In the further course of the removal of the printing forme, it is conveyed upward, against gravitational force, along an inclined push-out path until the front end of the printing forme is finally deposited on an angled holding bracket, which angled holding bracket is arranged in the front area of the push-out path. For a fresh printing forme to be mounted on the forme cylinder, the device has two holding elements, which delimit an inclined insertion path in the front area and which can be moved linearly in opposite directions in the axial direction of the forme cylinder, on which the front end of the to be mounted new printing forme rests until the time of mounting of the fresh printing forme. The holding elements are laterally moved away during the mounting of the fresh printing forme, so that they are clear of the path to the forme cylinder for the fresh printing forme. 
   A rotary printing press with a mounting device is known from EP 1 084 838 A1. A printing forme to be initially mounted on a forme cylinder is pushed out of the device until it touches a contact pressure roller that is placed against the forme cylinder with its end which is in front in the mounting direction. Thereafter, the fresh printing forme is pulled onto the surface of the forme cylinder. No suggestion regarding the alignment of the printing forme, by the use of a contact pressure roller, is provided. 
   A device for mounting a dressing on a cylinder of a printing press is known from DE 197 19 559 A1. The, device has two sliders, which are arranged one behind the other in the circumferential direction and which are aligned parallel with each other. An acute-angled bevel at the leading end of the dressing to be mounted, the sliders and a slit-shaped opening formed on the surface of the cylinder, with respect to an imagined tangent placed on the opening, have an acute opening angle of the same size. The dressing, with its bevel on its leading end, is guided against the slider which is in the rear in the circumferential direction and is placed against the surface of the cylinder and makes contact there. The slider, which is in front in the circumferential direction of the cylinder, is moved away from the surface of the cylinder. For mounting a dressing, the front slider pushes the bevel of the latter into the opening by use of its side facing the surface. A roller element is arranged, viewed in the mounting direction of the dressing, downstream of the rear slider and is connected with this slider. 
   A method and a device for the automatic placement of a printing plate on a plate cylinder of a rotary printing press is known from EP 1 101 612 A2. The printing plate, which is grasped by a gripper, is guided with its beveled leading end substantially radially against a transfer cylinder, which is arranged parallel with the plate cylinder and which works together with it, and which is aligned parallel with the plate cylinder. The beveled leading end is placed on the surface of the transfer cylinder, wherein the placement of the end of the printing plate takes place on a curved element on the surface of the transfer cylinder facing the plate cylinder. 
   A method and a device for mounting a printing forme which is guided to a forme cylinder is known from U.S. Pat. No. 5,671,674. The printing forme has an acute-angled bevel on its leading end. A rolling element is provided. The rolling element is placed against the forme cylinder and rolls off on the leading end of the printing forme. In the course of this, the rolling element pushes the bevel of the printing forme into an opening formed in the surface of the forme cylinder. 
   A method and a device for mounting a printing forme which is guided to a forme cylinder is also known from EP 1 155 840 A. The printing form has an acute-angled bevel on its leading end. A rolling element, which is placed against the forme cylinder and which rolls off on its surface, is provided. The leading end of the printing forme is guided against the rolling element. The rolling element, in the course of a rotation of the forme cylinder, pushes the bevel at the leading end of the printing forme into an opening, which is formed in the surface of the forme cylinder, as soon as the opening and the bevel face each other. 
   SUMMARY OF THE INVENTION 
   The object of the present invention is directed to providing devices and methods for use in aligning or mounting a dressing applied to a cylinder of a printing press. 
   In accordance with the present invention, this object is attained by the provision of at least one of a detent and a rolling element that are positioned along a path of dressing travel to a cylinder on which the dressing is to be mounted. The detent has a slope which cooperates with a tangent at a point of intersection of the slope with the cylinder, to define an acute angle that opens toward the dressing. If only a roller element is used for mounting the dressing, the bevel on the leading end of the dressing contacts the roller element surface, which surface of the rolling element lies within two legs of an opening angle whose vertex coincides with the rotational axis of the rolling element. One leg is a line that is perpendicular to the surface of the cylinder. 
   The advantages to be gained by the present invention lie, in particular, in that by use of the subject device, it is possible to introduce a dressing to be clamped on a cylinder into an opening in the cylinder in such a way that, in the course of a rotation of the cylinder, the dressing is pulled, to a great extent, automatically into the cylinder opening for being subsequently fastened therein. In particular, in connection with a detent arranged upstream of a rolling element, the danger of injury to an operator is reduced. The arrangement of the detent and the rolling element of the present invention prevents access to dangerous areas. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Preferred embodiments of the present invention are represented in the drawings and will be explained in greater detail in what follows. 
     Shown are in: 
       FIG. 1 , a first preferred embodiment of a device in accordance with the present invention for the alignment of a dressing applied to a cylinder of a printing press, and having a detent and a rolling element, with the rolling element being moved away from the cylinder, in 
       FIG. 2 , the device for the alignment of a dressing applied to a cylinder of a printing press in accordance with  FIG. 1  and having a detent and a rolling element, with the rolling element being moved against the cylinder, and in 
       FIG. 3 , a second preferred embodiment of a device in accordance with the present invention for the alignment of a dressing applied to a cylinder of a printing press, and having a rolling element as the detent. 
   

   DESCRIPTION OF PREFERRED EMBODIMENTS 
   In a printing press, for example a web-fed rotary printing press, as depicted schematically in  FIGS. 1 ,  2  and  3 , a cylinder  02 , preferably a forme cylinder  02 , on which at least one dressing  01 , which may be for example, a flexible printing forme  01  can be placed, rolls off on or in contact with a counter-pressure cylinder  03 , for example a transfer cylinder  03 . On its surface  04 , the forme cylinder  02  has at least one slit-shaped opening  06 , as seen in  FIG. 2 , which opening  06  preferably extends linearly or axially in respect to the forme cylinder  02 , and into which opening  06  a bevel  07 , that is arranged on one end of the dressing  01 , can be inserted, preferably in a positive manner. 
   The dressing  01  which, for example, is embodied as a plate-shaped printing forme  01  or as a support plate supporting a printing blanket, has a substantially rectangular surface of a length L and of a width. The dressing  01  has a support side with which, in the mounted state, the dressing  01  rests on a surface  04  of a cylinder  02 . The side of the dressing located opposite the support side is a dressing work surface which, in case the dressing  01  is embodied as a printing form  01 , is provided with a printed image or which can be provided with a printed image. The dressing  01  has two ends located opposite each other. A bevel  07 , in the form of an angled-off suspension leg, is arranged on at least one end of the dressing  01 , wherein the suspension leg or bevel  07  extends over the width of the dressing  01 . The surface of the dressing is flexible at least along the length L and can be matched to the curvature of the cylinder surface  04  when the dressing  01  is applied to the surface  04  of the cylinder  02 . In the mounted state of the dressing  01 , the length L of the dressing surface thus extends in the direction of the circumference of the cylinder  02 , while the width of the dressing surface extends in the axial direction of the cylinder  02 . 
   The at least one suspension leg or bevel  07  of the dressing  01  is fixed in place by the use of a fastening device, wherein the fastening device is arranged in a cylinder groove, wherein, as a rule, the cylinder groove extends in the axial direction with respect to the cylinder  02 . An end of the dressing  01 , which is aligned with the production direction of rotation P of the cylinder  01 , is called the dressing&#39;s leading end, while the oppositely located end is the trailing end of the dressing  01 . In this case, the production direction of rotation P of the cylinder  02  is the direction of rotation of the cylinder  02  during the printing process and is shown with an arrow in  FIGS. 1 ,  2  and  3 . At least the ends of the dressing  01 , with the suspension legs formed thereon, are made of a rigid material, such as, for example, metallic material, for example an aluminum alloy. Customarily, the material thickness of the dressing  01 , or at least the material thickness of the suspension legs, is a few tenths of a millimeter. For example, the thickness of the dressing  01  may be from 0.2 mm to 0.4 mm, and preferably 0.3 mm. Thus, the dressing  01 , as a whole, or at least its ends, consists of a dimensionally stable material, so that the ends can be permanently deformed by being bent against a material-specific resistance. 
   In a preferred embodiment, suspension legs have been formed at both leading and trailing ends of the dressing  01  along a bending edge, wherein the suspension legs can be inserted into a narrow opening  06 , in particular embodied in a slit-shape, of the cylinder  02 , and can be fastened there by operation of the fastening device. In respect to the length L of the level surface, or non-arched support side of the non-mounted dressing  01 , a leading suspension leg is angled on its one end at a bending edge with an opening angle α  1 , and on its other or trailing end a suspension leg is angled at a bending edge at an opening angle β  1 , wherein, as a rule, the opening angles α , β each lie between 30° and 140°. If the opening angle α  1  is assigned to a leading end of the dressing  01 , it preferably is embodied as an acute angle and in particular is 45°. The opening angle β  1  at the trailing end of the dressing  01  is often embodied to be 80°, or as an obtuse angle. In particular it is 85° or 135°. The beveled suspension leg at the leading end has a length l 1  which, for example, lies in the range of 4 mm to 11 mm, and in particular lies between 4 mm and 8 mm, wherein 6 mm is the preferred measurement. The beveled suspension leg at the trailing edge has a length l 2 , which is, for example, 6 mm to 15 mm, and in particular is 8 mm and 12 mm, wherein the shorter length is typically preferred in order to assure the easiest possible removal of the trailing edge from the opening  06  of the cylinder  02 . 
   The cylinder  02  has at least one narrow, slit-shaped opening  06 , of a slit width S, on its surface  04 , wherein the slit width S is less than 5 mm and preferably lies in a range between 1 mm and 3 mm. The opening  06  has a front edge  26  in the production direction P of the cylinder  02 , and a rear edge  27 , as seen in  FIG. 1 . An acute opening angle α  2 , which is between 30° and 50°, preferably 45°, is formed between the wall extending from the front edge toward the groove and an imaginary first tangent T 1 , resting on the surface  04  of the cylinder  02  at the opening  06 , as seen in  FIG. 2 . Thus, the beveled suspension leg at the leading end of the dressing  01  can be suspended, preferably positively connected, at this front edge  26  of the opening  06 , because the opening angle α  1  of the suspension leg at the leading end of the dressing  01  is preferably matched to the opening angle α  2 . The same applies to the trailing end of the dressing  01 . An opening angle β  2 , which is between 80° and 95°, and preferably 90°, or between 120° and 150°, and preferably 135°, is formed between the wall extending from the rear edge  27  toward the groove  06  and a imaginary first tangent T 1  resting on the surface  04  of the cylinder  02  at the opening  06 . Thus, the beveled suspension leg at the trailing end of the dressing  01  can be suspended, preferably positively connected, at this rear edge  27  of the opening  06 , because the opening angle β  1  of the beveled suspension leg at the trailing end of the dressing  01  is preferably matched to the opening angle β  2 . 
   For example, at least one preferably pivotably seated holding device and one preferably pre-stressed spring element, which are not specifically represented are arranged in the groove, wherein the spring element pushes the holding device against the beveled suspension leg at the trailing end, for example, which is suspended in the opening  06  on its rear edge  27 . The suspension leg at the trailing end is thus maintained on the wall extending from the rear edge  27  toward the groove. An actuating device, for releasing the pressure exerted by the holding element, is provided in the groove which, when actuated, pivots the holding device against the force of the spring element. Accordingly, the holding assembly substantially consists of the holding device, the spring element and the actuating device. 
   The cylinder  02  can be such that several dressings  01 , preferably of the same type, can be arranged on its surface  04 . If the cylinder  02  is embodied as a forme cylinder  02 , six plate-shaped printing formes  01 , for example, can be placed side-by-side in the axial direction of the forme cylinder  02 . More than one dressing  01  can be attached to the cylinder  02  in the direction of its circumference. For example, two grooves, each extending axially in respect to the cylinder  02  and with assigned openings  06 , can be provided on cylinder  02 , which two grooves are arranged, offset by 180° with respect to each other, at the circumference of the cylinder  02 . With this covering of the cylinder  02  with two dressings  01 , which are arranged one behind the other along the circumference of cylinder  02 , the leading end of the one dressing  01  is fastened in the one groove, while the trailing end of the same dressing  01  is fastened in the other groove. This correspondingly applies to the remaining dressing, or dressings  01  arranged on this cylinder. The dressings  01 , which are arranged side-by-side in the axial direction of the cylinder  02 , can also be arranged offset with respect to each other, for example individually or in pairs each by one half of the length L of the dressing  01 . This, however, requires further grooves with assigned openings  06 , or at least parts of these further grooves, to be cut into the cylinder  02 , which further grooves or parts of grooves are arranged with respect to each other about the circumference of the cylinder  02 , for example offset by 90°, in respect to the two previously mentioned grooves and openings  06 . 
   A cross bar  08  which, for example, can be a rigid hollow profiled section of square cross section, and which extends linearly or axially with respect to the cylinders  02 ,  03 , is arranged, fixed in place with respect to the forme cylinder  02 , for example, preferably in a space upstream of, and between the forme cylinder  02  and the counter-pressure cylinder  03 , i.e. in the gap or in the space defined by the surfaces  04  of these two cooperating cylinders  02 ,  03 . A support  11  is fastened either directly or through a connecting piece  09  which, for example, can be an L-shaped strip, on this cross bar  08 . Support  11  has a first end  12 , by the use of which support first end  12 , the support  11  is fastened on the cross bar  08  or on a connecting piece  09 . The fastening of the first end  12  of the support  11  is preferably provided by the use of a connecting element  13 , which can be a screw  13  or a rivet  13 . Thus, the first end  12  of the support  11  is not hinged, but is clamped, in particular is rigidly clamped to the cross bar  08 , either directly or through the intermediate connecting piece  09 . 
   In the preferred embodiment represented in  FIGS. 1 and 2 , at least one detent  14 , which is angled off in a direction toward the forme cylinder  02 , is attached to the first end  12  of the support  11 , or to the connecting piece  09 . The detent  14  has, for example at least on a detent side  23  facing the dressing  01 , a detent side  23  slope directed toward the surface  04  of the cylinder  02 , wherein an imaginary straight extension of this detent side  23  slope intersects the surface  04  of the cylinder  02  at a point C, as seen in  FIG. 2 . A preferably acute opening angle γ exists between a second tangent T 2  placed against the surface  04  of the cylinder  02  at this intersection point C and the detent side  23  slope, or its extension. The angle γ, represented as a vertical and opposite angle in  FIG. 2  facing the dressing  01  is maximally 90°, preferably between 40° to 60°, and in particular is 45°. The detent  14  is arranged so close to the surface  04  of the cylinder  02  that a dressing  01  to be mounted, which is being applied to the forme cylinder  02 , contacts the detent  14 , and simultaneously rests on the surface  04  of the cylinder  02  with its bevel  07  that is attached to its leading end. 
   By utilization of the detent side  23  slope formed on the detent  14  and facing the forme cylinder  02 , an alignment of the bevel  07  of a dressing  01  to be mounted on the forme cylinder  02  is aided. This bevel  07  at the leading end of a dressing  01  is guided to the opening  06  cut into the surface  04  of the forme cylinder  02  while the forme cylinder  02  rotates in its production direction P. In this case, the detent  14  can be embodied as a strip  14 , which preferably extends longitudinally with respect to the forme cylinder  02  and which is either of one piece or of several pieces, which several pieces are possibly arranged spaced apart from each other. Such a strip  14  can simultaneously take on the function of a finger protection strip situated between the forme cylinder  02  and the counter-pressure cylinder  03 , for example. The detent  14  can be fastened on the support  11 , or on the connecting piece  09 , for example by utilization of the previously described connecting element  13 . 
   On a second end, which is located opposite to the first end  12  of the support  11 , at least one rotatably seated rolling element  17  is arranged. When it is placed against the forme cylinder  02 , the rolling element  17  can roll off on cylinder surface  04 , or on a dressing  01  which is resting on the surface  04 , as depicted in  FIG. 2 , because of which rolling contact between rolling element  17  and cylinder surface  04  the bevel  07 , which is arranged on one end of the dressing  01 , is pressed into the opening  06  in the surface  04  of the cylinder  02 , and a dressing  01  is pressed against the surface  04  of the forme cylinder  02 . The rotational axis  18  of the rolling element  17  extends longitudinally with respect to the forme cylinder  02  and is parallel to a forme cylinder axis of rotation. The rolling element  17  is preferably embodied as at least one, or as several separate rolls  17 , or as one roller  17 . 
   In the preferred embodiment depicted in  FIGS. 1 and 2 , the rolling element  17  is arranged, viewed in the mounting direction M of the dressing  01 , downstream of, or after the detent  14 . The detent  14  initially guides the bevel  07  of the leading end of the dressing  01  to be mounted on the forme cylinder  02  into the opening  06  cut into the surface  04  of the forme cylinder  02 . In this position, the bevel  07  of the dressing  01 , as viewed in the production direction P of the forme cylinder  02 , is situated downstream of the opening  06  on the surface  04  of the forme cylinder  02 . In the course of a relative movement between the detent  14  and the surface  04  of the forme cylinder  02 , which relative movement can be a linear movement of the detent  14  directed in a direction opposite the mounting direction M of the dressing  01 , but which relative movement is preferably a rotation of the forme cylinder  02  in its production direction P, the bevel  07  is pushed in the direction toward the opening  06  and is then hooked in the opening  06  since the bevel  07  falls into the opening  06  because of the inherent weight of the dressing  01 . In the course of a further rotation of the forme cylinder  02  in its production direction P, the dressing  01  is pulled onto the forme cylinder  02  and in doing so, passes underneath the detent  14 , i.e. between a free end  22  of the detent  14 , which is located a slight vertical distance a 14  from the surface  04  of the forme cylinder  02  and which preferably faces the surface  04  of the forme cylinder  02 , and this surface  04  of the forme cylinder  02 . In this case, the distance a 14  is only a few millimeters, for example, this distance may be 1 to 3 millimeters. Thus, this distance a 14  is less than a distance a 07  which distance a 07  is the height of the bevel  07  when this bevel  07  stands on the surface  04  of the forme cylinder  02  and has not yet been introduced into the opening  06 . To assure the correct seating of the bevel  07  of the dressing  01  against a wall of the opening  06 , which correct seating is defined as a positive engagement of the bevel  07  against the wall of the opening  06 , the rolling element  17 , which has been placed against the forme cylinder  02 , rolls over the dressing  01 , by which contact, the dressing  01  is firmly pressed against the surface  04  of the forme cylinder  02 . 
   The support  11  for the rolling element  17  itself can advantageously be an elastically bendable, i.e. reversibly deformable, body, which is preferably embodied as a leaf-shaped element, such as a leaf spring. Thus, the support  11  can be configured as a plate of spring steel  11 , for example, which is firmly clamped at its first end  12 . 
   An actuating mechanism  19  can be provided for the rolling element  17 , wherein the actuating mechanism  19  is preferably embodied as a reversibly deformable hollow body  19 , for example as a hose  19 , which hose  19  can be charged with a pressure medium. When actuated, i.e. when charged with the pressure medium, for example, the actuating mechanism  19  acts, on a first side on the support  11 , and is in engagement, on the other side by the cross bar, as seen in  08   FIG. 1 . Because of the actuation of the actuating mechanism  19 , the second end  12  of the support  11  can be deflected in the direction toward the forme cylinder  02  by an elastic bending of the support  11 , and the rolling element  17  can thus be placed against the cylinder  02  as depicted in  FIG. 2 . At the termination of the actuation of the actuating mechanism  19 , the support  11  returns to its original position because of its elasticity, i.e. because of its resilient property. As a result, the rolling element  17  is moved back away from the surface  04  of the forme cylinder  02 , or from a dressing  01  resting on the surface  04  of the forme cylinder  02 , i.e. the rolling element  17  comes out of contact with the dressing  01 . 
     FIGS. 1 and 2  show the same first preferred embodiment, by way of example, of a device for guiding, aligning and pressing a dressing  01  against a cylinder  02  of a printing press shown in two different operating states, namely in the operating state, with a rolling element  17  moved away in  FIG. 1 , and in  FIG. 2  in the operating state, with a rolling element  17  in contact. In both operating states, a dressing  01 , which is being applied to a cylinder  02 , is aligned by the first preferred embodiment of the device in accordance with the present invention with an opening  06  cut into the cylinder  02 , which opening  06  is preferably in the form of a slit, so that, viewed in the production direction P of the cylinder  02 , a bevel  07  attached to a leading end of the dressing  01  can be fastened in the opening  06 . 
   If the actuating mechanism  19  is installed between the support  11  and the cross bar  08 , it is advantageous to form or to attach a strip  21 , for example on the support  11 , which strip  21  protects the actuation mechanism  19  and which prevents it from unintentionally slipping out or from removal from its place of attachment. 
   In connection with some applications of the present invention, for example, in the arrangement of several printing formes  01  side-by-side in the axial direction on the surface  04  of the forme cylinder  02 , it is advantageous to arrange several supports  11  side-by-side in the axial direction of the forme cylinder  02 , each support  11  with at least one rolling element  17 , and wherein the supports  11  can be moved against or away from the cylinder  02  independently of each other individually, or in groups, by separate actuating mechanisms  19  assigned to each of them. In this way, either a single rolling element  17 , or a group of rolling elements  17 , can be selectively used for pressing a defined printing forme against the surface  04  of the forme cylinder  02 . 
   In a further preferred embodiment of the present invention as shown in  FIG. 3 , the provision of a strip, which is arranged close to the cylinder  02  and having the function of a detent, has been omitted. At least one rolling element  17 , which preferably can be positioned against and away from the cylinder  02 , and which at least one rolling element  17  may be for example, a roller extending linearly in the axial direction with respect to the cylinder  02 , or one or several rolls, here take on the function of the detent. A dressing  01 , preferably moved tangentially against the cylinder  02 , comes in contact with the circumference U of the rolling element  17  within an arc of a curved segment b 17  of the rolling element  17 , which segment b 17  is facing the cylinder  02 . A contact point A of the dressing  01  with the rolling element  17  is located closer to the surface  04  of the cylinder  02  than a spacing distance a 18  of the rotational axis  18  of the rolling element  17  from the surface  04  of the cylinder  02 . The curved segment b 17  lies between two legs  28 ,  29  of an opening angle δ, wherein a vertex of the opening angle δ coincides with the rotational axis  18  of the rolling element  17 , a first leg  28  of the opening angle δ forms a perpendicular distance line extending from the vertex to the surface  04  of the cylinder  02 , and the opening angle δ is at most 60°, and in particular is at most 45°. 
   As can be seen in  FIG. 3 , the bevel  07  at the front end of the printing forme  01  is in simultaneous contact with the rolling element  17 , as well as with the surface  04  of the cylinder  02 . Because of this simultaneous contact, the rolling element  17  aligns the dressing  01  in the linear or axial direction of the cylinder  02 . In the course of a relative movement between the rolling element  17  and the surface  04  of the cylinder  02 , during which relative movement of the cylinder  02  is preferably rotated in the production direction P, the rolling element  17 , which is placed against the cylinder  02 , rolls off on the surface  04  of the cylinder  02  in such a way that the rolling element  17  guides the dressing  01 , with its bevel  07  which is in contact with the rolling element  17 , so that the bevel  07  is inserted into an opening  06  cut into the surface  04  of the cylinder  02  and which opening  06  is preferably embodied in a slit shape, and pushes bevel  07  into the opening  06  for the purpose of holding the dressing  01  on the surface  04  of the cylinder  02 . In the course of the mounting of the dressing  01 , an operational state is also reached in which the bevel  07  on the leading end of the dressing  01 , as the dressing  01  is applied to the cylinder  02 , contacts the curved segment b 17  and simultaneously protrudes at least partially into the opening  06  cut into the surface  04  of the cylinder  02 . Thus, the alignment of the dressing  01  applied to the cylinder  02  preferably also takes place with respect to the opening  06  in the cylinder  02  in which the bevel  07  of the dressing  01  is kept. The end of the dressing  01  to be aligned and which is resting on the surface  04  of the cylinder  02  preferably is that end of the dressing  01  which also leads in the production direction P of the cylinder  02 . 
   While preferred embodiments of devices and methods for the alignment and mounting of a covering applied to a cylinder in a printing machine, in accordance with the present invention, have 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 drives for the cylinders, the sizes of the cylinders, and the like could 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.