Abstract:
Commercial newspaper printing presses utilize an improved water or fountain solution supply apparatus to spray the solution onto dampening rollers. In the improvement a closed to the air fountain solution supply apparatus keeps the solution free of contaminants. A built-in turbo dampening roller cleaner eliminates the need to dismantle the turbo dampening assembly to clean same.

Description:
[0001]    The invention relates generally to printing presses and, more particularly, to built-in apparatus for supplying fluid to and cleaning a device to apply fountain solution to a printing press. Applicants claim priority based upon U.S. Provisional application Ser. No. 60/832,796 filed Jul. 24, 2006, the contents of which are incorporated herein by reference. 
     
     BACKGROUND OF THE INVENTION 
       [0002]    Large commercial printing presses use a multitude of rollers, many such presses use as many ink rollers as water or fountain solution rollers. One such printing press is shown and described at U.S. Pat. No. 5,179,899 issued to Man Roland Machine AG on Jan. 19, 1993. Part of the use of a perforated roller carrying water thereon can be explained in this patent at col. 2, line 35 where it indicates “this device may be, for example, a washing device such as washing water, for example, applying a spray to form an ink repellant damping or water layer on the impression cylinder, thereby maintaining the already printed image on the substrate web.” 
         [0003]    On many of these printing presses, such a device is known as a turbo dampener. As the turbo dampener is used, the device builds up with contaminants. These contaminants, build up to the turbo rotor, which supplies the fluid to the printing press. Additionally, these contaminants also build up in the water feed channel and components inside the turbo dampener. These contaminants may include paper dust, ink and bacteria. As printing press components become filled with contaminants, eventually they must be cleaned. Heretofore, this has meant dismantling the press and cleaning the various parts thereof, including removing the approximately 25 to 300 turbos in a typical newspaper printing plant and scrubbing the surface of the turbo and the turbo rotor and fluid supply parts until they are clean, then reassembling the printing press. 
         [0004]    Down time with any production line apparatus greatly decreases the efficiency of the entire printing process. Having to remove and individually clean these printing press turbos and then again having to reassemble the printing press periodically, creates inefficiencies and labor intensive maintenance in what would otherwise be an efficient automated process. A need has developed for eliminating and/or preventing contaminant buildup in the turbo dampeners of commercial printing presses. 
       SUMMARY OF THE INVENTION 
       [0005]    It is therefore an object of the present invention, generally stated, to provide a new and improved apparatus for eliminating contaminants from the water feed system and rotor of a turbo dampening assembly in a large commercial printing press of the type used to print newspapers. 
         [0006]    Another object of the present invention is the provision of an on-board apparatus for cleaning contaminants from a turbo dampening roller. 
         [0007]    A further object of the present invention is the provision of an improved water feed apparatus that prevents the clogging of these components to a turbo dampener in a printing press free of contaminant build up. 
         [0008]    The invention resides in a printing press in a fountain solution spreading or spraying apparatus for coating a dampening roller. The apparatus includes a housing mounted on the printing press and an elongate generally cylindrical rotor rotatably mounted on the housing. An elongate reservoir is mounted on the housing below and to the side of the rotor for receiving fountain solution. A bottom of the rotor is positioned to contact an upper surface of a fountain solution positioned in the reservoir for receiving the fountain solution thereon and spraying same toward a dampening roller on the printing press. The invention is directed to an improvement comprising a rotor cleaning apparatus including elongate means for cleaning the rotor reciprocally positioned spatially adjacent an outer surface of the rotor. The invention includes means for reciprocating the elongate cleaning means for positioning a distal end of the cleaning means in contact with the outer surface of the rotor and control means for operating the reciprocation of the cleaning means. 
         [0009]    The invention is further directed to a closed to the air fountain solution supply apparatus including a flow meter and tubing, branch tubing and sometimes sub-branch tubing that provide equal distribution of the fountain solution to spatially related nozzles substantially equally spaced along the fountain solution reservoir. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The invention may best be understood from the following detailed description of currently preferred embodiments thereof taken in conjunction with the accompanying drawings wherein like numerals refer to like parts, and in which: 
           [0011]      FIG. 1  is a vertical cross-sectional view of a presently existing turbo dampening rotor assembly; 
           [0012]      FIG. 2  is a vertical cross-sectional view, similar to  FIG. 1 , of a turbo dampening rotor assembly constructed in accordance with the present invention; 
           [0013]      FIG. 3  is and elevational view of the elongate turbo dampening cleaning assembly of the present invention; 
           [0014]      FIG. 4  is an elevational view of a water supply apparatus for a three wide turbo dampener constructed in accordance with the present invention; 
           [0015]      FIG. 5  is an elevational view of a water supply apparatus for a two wide turbo dampener constructed in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0016]    Referring to  FIG. 1 , a dampening take up roller, generally indicated at  10 , is a part of the main water feed for a Man Roland printing press (not shown) but which can be seen diagrammatically in the aforementioned U.S. Pat. No. 5,179,899. Adjacent the dampening take up roller  10  is what is termed a turbo dampening assembly, generally indicated at  11 , constructed in accordance with the heretofore existing prior art. This dampening assembly includes a housing, generally indicated at  12 , an elongate rotor, generally indicated at  13  with the bottom thereof sitting in fluid  14  captured in a fluid reservoir  15  adjacent the bottom of the housing  12 . The water dampening fluid  14 , otherwise known as the fountain solution, wets the outside of rotor  13 , which rotates at high speed to fling the fountain solution outwardly of the roller and through the open space under a shutter  16  and by a water deflector  17  at both ends of the roller onto the outer surface  18  of the dampening take up roller  10 . 
         [0017]    A pump (not shown) supplies fountain solution  14  to the reservoir  15  by means of a supply pipe  20  that leads into an open air, elongate overflow trough  21  that runs the length of roller  10  and from there through a plurality of evenly spaced metering bores  22  positioned along the length of the overflow trough  21  to each of a plurality of inlet pipe sockets  23  that lead into the side of elongate reservoir  15 . On the opposite side of the reservoir  15 , an overflow  24  assures that the top surface level  14   a  of the fountain solution remains constant. The overflow  24  leads to a return line trough  25 . 
         [0018]    In operation, when the turbo dampening rotor  13  and/or the open to the air fountain solution supply apparatus becomes contaminated enough to noticeably degrade the printing operation, the printing press (not shown) is shut down, the turbo is removed for cleaning of the rotor and water feed channel and then reassembled at which time the printing operation re-starts on line operation. 
         [0019]    Referring to  FIGS. 2 , and  3 , an improved on site turbo dampener rotor cleaning assembly, generally indicated at  30 , is mounted on the housing  15   a  subjacent and between the water deflectors  17   a - 17   a  and between the housing  15   a  and the roller  10   a . The turbo rotor cleaning system  30 , constructed in accordance with the present invention, includes an elongate cylinder mounting brace  31  mounted on the housing so as to allow fountain solution  14  and contaminant particles (not shown) to drain into the return line trough  25   a . Along the length of the cylinder mounting brace  31  are positioned a plurality (in this embodiment 3) of pneumatic cylinders  32 ,  33  and  34 , each pneumatic cylinder includes a piston  32   a ,  33   a ,  34   a  respectively, extensible reciprocatively therefrom. Each piston in turn is mounted to an elongate bracket  35  that includes an elongate recess therein in which the elongate base of the brush  36  is positioned and retained by fasteners  37 - 37 . The brush includes a plurality of bristles  38  extending from the base of the brush toward the roller,  13   a.    
         [0020]    In operation, during cleaning, the rotor  13   a  is rotated at a slower speed than when it is flinging fountain solution onto the dampening roller  10   a . The pneumatic cylinders  32 ,  33  and  34  are operated at a predetermined pressure to force the pistons outwardly thereof and position the brush bristles  38  against the outside surface of roller  13   a  as it rotates. Contaminants from the outside surface of the roller  13   a  may fall into the return line trough or get stuck on the bristles  38  and be removed manually therefrom. The pistons  32   a ,  33   a  and  34   a  (only one shown) has sufficient unused travel, as originally set up to make up for wear in the bristles  38  as they may become shorter during long use. The pressure in the pneumatic cylinder determines the force the brush bristles  38  apply to the outer surface  13   b  of rotor  13   a  and is adjustable so as to provide for adequate cleaning. Adjacent the top of the cylinder mounting brace  31  is a wiper blade mount  40  that has a wiper  41  adjustably positioned thereon to assure a proper amount of fluid solution is deposited upon the dampening take up roller  10   a.    
         [0021]    Referring to  FIGS. 2 ,  4  and  5 , the improved fountain solution supply assembly, generally indicated at  40 , includes six distribution hubs in a triple wide printing press with a roller length of approximately 70″-85″ for which the fountain supply side assembly  40  is configured as shown most clearly in  FIG. 4 . A double wide printing press utilizes the supply side assembly shown at  41  for a roller length of approximately 48″ to 58″. A narrower single wide printing press, utilizes the supply side assembly shown at  41  for a roller length of approximately 23″ to 36″. All three assemblies utilize a flow meter  42  having a metering valve  43  and a display  44  thereon. The flow meter can be replaced with another type of flow control device such as a flow controller or orifice. In the preferred embodiment from the flow meter  42 , which is the same for each supply apparatus, a ⅜ inch outside diameter output line  45  in the six hub assembly  40 , proceeds to a position not quite half way along the length of the reservoir  15   a  on the back bracket  15   b  of the housing  12   a  where it flows into a four way tube fitting  46 . From fitting  46 , three ⅜ inch outside diameter outlet lines  47 ,  48  and  50  each lead to T-couplings  51 ,  52  and  53  respectively, that branch with ¼ inch outside diameter tubing to distribution hubs  54 ,  55 ,  56 ,  57 ,  58  and  60  that are evenly spaced at about 12 inch intervals along the reservoir and are at the same positions as the inlet pipe sockets  23  shown in  FIG. 1 . 
         [0022]    The fountain solution feeding system  40  is engineered to deliver even flow to each of the distribution hubs to create a substantially level flow of fluid to the reservoir. 
         [0023]    Referring to  FIG. 5 , the double wide fountain solution distribution assembly  41  preferably includes a ⅜ inch outside diameter feed line  64  from the flow meter  42  that feeds approximately half way along the length of the double wide turbo damping roller  13   a  into a T-shape fitting  65  which divides the flow of fluid evenly into two ⅜ inch outside diameter lines  66 ,  67  that also flow through T couplings  68 ,  70  into four ¼ inch outside diameter like length lines feeding into evenly spaced (about 12 inches apart) distribution hubs  71 ,  72 ,  73  and  74  that feed into the fountain solution reservoir of the double wide length roller, similarly to the 6 wide apparatus shown in  FIG. 4 . 
         [0024]    A preferred material for the tubing is thin walled stainless steel, although other materials such as polyethylene can be utilized within the scope of the present invention. Also the tubing diameters may be varied. By eliminating the open air portions of the prior art fluid supply assembly, contaminants in and around the fountain solution are eliminated on the supply side at least until the solution enters the reservoir  15   a . Elimination of contaminant collecting open air troughs in the fluid supply assembly substantially lessens the necessity of down time for cleaning out the turbo dampening portion of the printing press. Others have tried to improve on the old, open air trough  21  by adding a cover and other modifications, but this has not proven to be as effective as the tube system that is described herein. 
         [0025]    Thus, a new and improved turbo dampening cleaning assembly and supply side fountain solution feed assemblies for both 2 wide and 3 wide printing presses have been shown and described. It will be understood by those skilled in the art that modifications and changes may be made from the disclosed embodiments within the scope of the present invention. It is the purpose of the appended claims to cover such modifications and changes.