Abstract:
In an apparatus for clamping and releasing a gearwheel rim with respect to a main gearwheel that bears the gearwheel rim, a clamping apparatus includes an axially guided, displaceable clamping plate clamping the gearwheel rim between the plate and the main gearwheel. Antifatigue bolts are used for such a purpose. The bolts are expanded by an actuator for releasing the clamped gearwheel rim to an extent that cancels the clamping action.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     Field of the Invention  
         [0002]     The invention relates to an apparatus for clamping and releasing a gearwheel rim with respect to a main gearwheel that bears the gearwheel rim, for a subsequent phase shift of the two with respect to one another.  
         [0003]     It is known, for example, in turner devices for sheet processing machines, in particular, printing press, for the main gearwheel to be in drive contact with a part of the gearwheel train of a printing press and for the gearwheel rim to be in drive contact with the other part of the gearwheel train. A phase shift of the gearwheel trains has to be performed to change the turner device over from recto to verso printing.  
         [0004]     German Patent DE 42 23 189 (corresponding to U.S. Pat. No. 5,398,606 to Becker) shows, for example, an apparatus for clamping a gearwheel rim that is mounted rotatably on the hub of a main gearwheel. For this purpose, fastening screws fasten a supporting plate to the hub of the main gearwheel at a distance. Radially oriented clamping elements are disposed in the distance gap that are supported on the supporting plate. Disk springs are provided to apply the clamping force and actuating cylinders are provided to release the clamping force.  
       SUMMARY OF THE INVENTION  
       [0005]     It is accordingly an object of the invention to provide an apparatus for the actuation of clamping elements that can be controlled remotely that overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and that has a simple construction and a high clamping force.  
         [0006]     With the foregoing and other objects in view, there is provided, in accordance with the invention, an apparatus for clamping a drive element between two components that are connected by bolts providing a clamping force and are disposed rotatably, including an actuator for releasing the clamping connection of the drive element, the actuator configured to displace the two components axially relative to one another counter to the clamping force of the bolts.  
         [0007]     The advantage of the invention is a simple construction of the clamping elements and the capability to transmit high moments in a small installation space due to the high clamping forces that can be achieved by using antifatigue bolts as spring elements. Mounting the clamping plate without play in the circumferential direction makes it possible to use a second pair of friction surfaces to increase the moment transmission. To ensure the freedom from play of the clamping plate in the circumferential direction, there is provision for the mounting between the clamping plate and pressure bolts to be lined, for example, by an epoxy resin.  
         [0008]     In accordance with another feature of the invention, the first component is a main gearwheel having a hub, the second component is a clamping plate, and the drive element is a crown gear rotatably mounted on the hub of the first component.  
         [0009]     In accordance with a further feature of the invention, there are provided guide bolts. The clamping plate is mounted in an axially displaceable manner on the guide bolts.  
         [0010]     In accordance with an added feature of the invention, the guide bolts are connected fixedly to the main gearwheel.  
         [0011]     In accordance with an additional feature of the invention, the hub has an end side and there is provided an operating cylinder having an operating piston. The guide bolts have a collar for support on the end side of the hub and are brought into operative contact with the operating piston of the operating cylinder.  
         [0012]     In accordance with yet another feature of the invention, there is provided a restoring spring disposed between the operating piston and the clamping plate.  
         [0013]     In accordance with yet a further feature of the invention, the clamping plate has a through hole and at least one of the guide bolts is disposed without play in the through hole of the clamping plate.  
         [0014]     In accordance with yet an added feature of the invention, the clamping plate has a central hole and the actuator is an operating cylinder having a casing mounted in the central hole of the clamping plate.  
         [0015]     In accordance with yet an additional feature of the invention, the casing of the operating cylinder has hooks distributed over a circumference thereof and the hooks are disposed to be brought into operating contact with the clamping plate.  
         [0016]     In accordance with again another feature of the invention, at least one of the bolts is a threaded antifatigue bolt.  
         [0017]     In accordance with again a further feature of the invention, the antifatigue bolt has an adjustable head and is to be screwed to the main gearwheel and is to be supported on the clamping plate by the adjustable head.  
         [0018]     To increase the resilient, elastic component of the antifatigue bolts, the expansion component is selected to be relatively great in relation to the fastening component, for example, 1:4. A further possibility lies in providing a spacer sleeve that is resilient in the axial direction between the antifatigue bolt head and the clamping plate.  
         [0019]     In accordance with again an added feature of the invention, the clamping plate has a hole and a spacer sleeve is to be disposed in the hole of the clamping plate and supports the antifatigue bolt on the clamping plate.  
         [0020]     In accordance with again an additional feature of the invention, there is provided a thrust rod, the casing of the operating cylinder being coupled to the thrust rod for selectively clamping and releasing an adjusting carriage.  
         [0021]     With the objects of the invention in view, in an assembly having a rotating main gearwheel with a hub, a rotating clamping plate, bolts connecting the clamping plate to the gearwheel in a clamping connection, the bolts providing a clamping force, and a crown gear rotatably mounted on the hub and disposed between the gearwheel and the plate, there is also provided a clamping apparatus for clamping the crown gear, including an actuator releasing the clamping connection of the crown gear between the gearwheel and the plate by displacing the gearwheel and the plate axially relative to one another counter to the clamping force of the bolts.  
         [0022]     With the objects of the invention in view, in a sheet processing printing press having a turner device with a drum, there is also provided an apparatus for clamping a drive element between two components of the press, which components are connected by bolts providing a clamping force and are disposed rotatably, the apparatus including an actuator according to the present invention for releasing a clamping connection of the drive element.  
         [0023]     With the objects of the invention in view, in a sheet processing printing press having a turner device with a drum, the turner device having a rotating main gearwheel with a hub, a rotating clamping plate, bolts connecting the clamping plate to the gearwheel in a clamping connection, the bolts providing a clamping force, and a crown gear rotatably mounted on the hub and disposed between the gearwheel and the plate, there is also provided a clamping apparatus disposed on the drum for clamping the crown gear, the clamping apparatus having an actuator releasing the clamping connection of the crown gear between the gearwheel and the plate by displacing the gearwheel and the plate axially relative to one another counter to the clamping force of the bolts.  
         [0024]     Other features that are considered as characteristic for the invention are set forth in the appended claims.  
         [0025]     Although the invention is illustrated and described herein as embodied in an apparatus for the actuation of clamping elements that can be controlled remotely, it is, nevertheless, not intended to be limited to the details shown because 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.  
         [0026]     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. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0027]      FIG. 1  is a diagrammatic cross-sectional view of a sheet fed rotary press;  
         [0028]      FIG. 2  is a fragmentary, cross-sectional view of a clamping device according to the invention for use in the rotary press with an antifatigue bolt coupling in a clamped operating state;  
         [0029]      FIG. 3  is a fragmentary, cross-sectional view of the clamping device of  FIG. 2  with the antifatigue bolt coupling in a released operating state; and  
         [0030]      FIG. 4  is a fragmentary, cross-sectional view of an alternative embodiment of the clamping device of  FIGS. 2 and 3 . 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0031]     Referring now to the figures of the drawings in detail and first, particularly to  FIG. 1  thereof, there is shown a machine  1  that processes sheets  7 , for example, a printing press, has a feeder  2 , at least one printing unit  3  and/or  4  and a deliverer or delivery  6 . The sheets  7  are removed from a sheet stack  8  and fed to the printing units  3  and  4  through a feed table  9  individually or overlapped. The printing units  3  and  4  each have a plate cylinder  11 ,  12  in a known manner. The plate cylinders  11 ,  12  each have an apparatus  13 ,  14  for fastening flexible printing plates. Moreover, each plate cylinder  11 ,  12  is associated with an apparatus  16 ,  17  for the semiautomatic or fully automatic changing of printing plates.  
         [0032]     The sheet stack  8  lies on a stack board  10  that can be raised in a controlled manner. The sheets  7  are removed from the upper side of the sheet stack  8  by what is referred to as a suction head  18  that, inter alia, has a number of lifting and dragging suckers  19 ,  21  for separating the sheets  7 . Moreover, the blowing devices  22  are provided for loosening the upper sheet layers, and sensing elements  23  are provided for tracking the stack. To align the sheet stack  8 , in particular, the upper sheets  7  of the sheet stack  8 , a number of lateral and rear stops  24  are provided.  
         [0033]     The sheets  7  are transported through the machine, in particular, between the printing units  3 ,  4 , by cylinders  26 ,  27 ,  28  that carry gripper devices. The gripper devices are configured as a turner device  25 . The transfer cylinder  26 , the storage drum  27 , and the turner drum  28  are, thus, disposed behind the printing unit  3 . The clamping apparatus can be disposed both on the turner drum  28  and on the storage drum  27 . A configuration on the turner drum  28  is described in the exemplary embodiment of the present invention.  
         [0034]     For such a purpose, as shown in  FIGS. 2 and 3 , the turner drum  28  bears what is known as a double gearwheel having a main gearwheel  31  that is fastened to the bearing journal  29  of the turner drum  28  and bears a crown gear  33  that is disposed so as to be rotatable in the circumferential direction on its hub  32 . An axially movable clamping plate  34  is disposed on the end side of the hub  32 , which clamping plate  34  can be brought into clamping contact with the crown gear  33 . The clamping plate  34  is held in a manner guided axially on guide bolts  36  and is stressed together with the main gearwheel  31  by provided antifatigue bolts  37  such that the crown gear  33  is clamped fixedly between a flank of the main gearwheel  31  and the clamping plate  34 . The guide bolts  36  and the antifatigue bolts  37  are disposed alternately in a circle around the cylinder axis  38 . Very great holding forces can be achieved by using the antifatigue bolts  37 . As a result, the clamping apparatus is particularly suitable for long machines with, for example, more than four processing stations after the turner device  25 . An operating cylinder  39  that is disposed so as not to be rotatable releases the gearwheel clamping. The cylinder  39  has an annular operating chamber  41  and an annular operating piston  42  that is disposed so as not to be rotatable. The cylinder casing  43  is mounted axially movably in a central hole  44  in the clamping plate  34 .  
         [0035]     The mounting of the cylinder casing  43  permits the clamping plate  34  to rotate with respect to the cylinder casing  43  that is disposed in a rotationally fixed manner.  
         [0036]     To release the clamping connection of the crown gear  33  and the main gearwheel  31 , the working chamber  41  has pressure applied to it and, as shown in  FIG. 3 , moves the annular piston  42  counter to the force of a restoring spring  47  until the annular piston  42  initially comes into contact with the annularly disposed guide bolts  36 . The annular piston  42  thereupon presses axially against the guide bolts  36  that are supported on the end side of the main gearwheel  31  by a collar  49  and, thus, form an abutment for the operating cylinder  39 . The cylinder casing  43  is moved axially counter to the piston movement by the operating pressure in the operating chamber  41  and, in the process, reaches behind a correspondingly configured circumferential edge  52  of the clamping plate  34  with provided hooks  51  that are disposed on its circumference and moves the clamping plate  34  along with itself counter to the clamping force of the antifatigue bolts  37 .  
         [0037]     The antifatigue bolts  37  are extended to such an extent in the process to cancel the holding force that acts on the crown gear  33 . The extension of the antifatigue bolt  37  lies within the elastic spring range of the antifatigue bolt material and can, therefore, be repeated almost as desired without a permanent deformation.  
         [0038]     The bolts  36  that serve to guide the clamping plate  34  are fitted without play into holes  48  of the main gearwheel  31 . To avoid circumferential play between a bolt  36  and a through hole  53  in which the respective bolt  36  is disposed, there is provision for the intermediate space  54  between the hole  53  and the bolt  36  to be filled with a plastic, for example, epoxy resin.  
         [0039]     To maximize the expansion component of the antifatigue bolt  37 , there is provision for a diameter/length ratio of the antifatigue bolt  37  to be small. To increase the spring action of the antifatigue bolt  37 , there is provision for a spacer sleeve  58  to be provided in a hole  59  of the clamping plate  34  between the adjustable head  61  (for example, nut) of the antifatigue bolt  37  and the clamping plate  34 . The spring elasticity of the clamping device is increased by this measure.  
         [0040]     The required clamping force of the coupling is set by the number of antifatigue bolts  37  and their elasticity.  
         [0041]     In a preferred exemplary embodiment according to  FIG. 4 , there is provision for a switching movement of the operating cylinder  39 , in particular, the axial movement of the casing  43 , to be used to release a clamping action on an adjusting carriage through a thrust rod  62 , as is disclosed, for example, from German Patent DE 42 23 189 C3 (corresponding to U.S. Pat. No. 5,398,606 to Becker). The thrust rod  62  is rotatably mounted with respect to the casing  43  that is disposed so as not to be rotatable, but is coupled in an axially displaceable manner to the casing  43 .  
         [0042]     This application claims the priorities, under 35 U.S.C. § 119, of German Patent Application No. 10 2004 011 620.2 filed Mar. 10, 2004, and German Patent Application 10 2004 045 098.6 filed Sep. 17, 2004; the entire disclosure of the prior applications are herewith incorporated by reference.