Abstract:
A printer is provided with: offset printing units ( 120  to  150 ) comprising impression cylinders ( 121   a  to  151   a,    121   b  to  151   b ) for holding and transferring a sheet ( 101 ), blanket cylinders ( 122   a  to  152   a,    122   b  to  152   b ) facing the impression cylinders ( 121   a  to  151   a,    121   b  to  151   b ), plate cylinders ( 123   a  to  153   a,    123   b  to  153   b ) facing the blanket cylinders ( 122   a  to  152   a,    122   b  to  152   b ), and ink devices ( 124   a  to  154   a,    124   b  to  154   b ) for supplying ink to the plate cylinders ( 123   a  to  153   a,    123   b  to  153   b ); and an intaglio printing unit ( 180 ) comprising an impression cylinder ( 181 ) which receives the sheet ( 101 ) subjected to offset printing in the offset printing unit ( 150 ) and holds and transfers the sheet ( 101 ), an intaglio plate cylinder ( 182 ) facing the impression cylinder ( 181 ), ink supply means ( 183  to  185 ) for supplying ink to the intaglio plate cylinder ( 182 ), and the like.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a security printing press for printing banknotes such as bank bills and securities such as stock certificates and bond certificates. 
       BACKGROUND ART 
       [0002]    As described for example in Patent Literature 1 listed below and the like, a security printing press employed for printing banknotes such as bank bills and securities such as stock certificates and bond certificates is one which performs offset printing of printing images of a plurality of colors simultaneously on both surfaces of a sheet, by transferring printing images of inks of the respective colors onto two blanket cylinders, which are in contact with each other, from a plurality of inking devices disposed along circumferential directions of the blanket cylinders via corresponding plate cylinders, and by causing the sheet to pass between the blanket cylinders, and which then performs intaglio printing by means of an intaglio printing plate. 
       CITATION LIST 
     Patent Literatures 
       [0000]    
       
         Patent Literature 1: Japanese Patent Application Publication No. Hei 2-187337 
         Patent Literature 2: Japanese Patent Application Publication No. Hei 11-105249 
         Patent Literature 3: Japanese Patent Application Publication No. 2001-225441 
         Patent Literature 4: Japanese Patent Application Publication No. 2000-127349 
         Patent Literature 5: Published Japanese Translation of International Application No. Hei 7-002417 
         Patent Literature 6: Japanese Patent Application Publication No. 2007-106128 
         Patent Literature 7: Japanese Patent No. 2722022 
         Patent Literature 8: Japanese Patent No. 4025255 
       
     
       SUMMARY OF INVENTION 
     Technical Problem 
       [0011]    Such a security printing press as described above, however, performs offset printing on the sheet by pressing the sheet with the blanket cylinders each having an elastic rubber blanket wound around the surface thereof. For this reason, the security printing press is incapable of performing offset printing of sharp printing images on the sheet. 
         [0012]    In view of the above-described circumstances, an object of the present invention is to provide a security printing press capable of performing offset printing of sharp printing images on a sheet, and continuously performing intaglio printing on the sheet in line. 
       Solution to Problem 
       [0013]    To solve the above-described problem, a security printing press for printing securities according to the present invention is characterized in that the security printing press comprises: an offset printing unit including an impression cylinder which holds and transports a sheet, a blanket cylinder which is in contact with the impression cylinder, a plate cylinder which is in contact with the blanket cylinder, and ink supply means for supplying ink to the plate cylinder; and an intaglio printing unit including an impression cylinder which receives the sheet subjected to offset printing in the offset printing unit and holds and transports the sheet, an intaglio cylinder which is in contact with the impression cylinder, an ink collecting cylinder which is in contact with the intaglio cylinder, a plurality of ink form cylinders which are in contact with the ink collecting cylinder, and a plurality of inking devices which are disposed to respectively correspond to the ink form cylinders and which supply ink to the corresponding ink form cylinders. 
         [0014]    In addition, the security printing press for printing securities according to the present invention is characterized in that in the above-described security printing press, the offset printing unit includes: an offset printing section for one surface including an impression cylinder for one surface which holds and transports the sheet, a blanket cylinder for one surface which is in contact with the impression cylinder for one surface and which performs offset printing on one surface of the sheet, a plate cylinder for one surface which is in contact with the blanket cylinder for one surface, and ink supply means for one surface for supplying ink to the plate cylinder for one surface; and an offset printing section for the other surface including an impression cylinder for the other surface which is in contact with the impression cylinder for one surface of the offset printing section for one surface and which receives the sheet from the impression cylinder for one surface and holds and transports the sheet, a blanket cylinder for the other surface which is in contact with the impression cylinder for the other surface and which performs offset printing on the other surface of the sheet, a plate cylinder for the other surface which is in contact with the blanket cylinder for the other surface, and ink supply means for the other surface for supplying ink to the plate cylinder for the other surface, and each of the ink supply means for one surface of the offset printing section for one surface and the ink supply means for the other surface of the offset printing section for the other surface includes: two ink fountains; an oscillating roller; and oscillation adjusting means for adjusting oscillation of the oscillating roller. 
         [0015]    In addition, the security printing press for printing securities according to the present invention is characterized in that the above-described security printing press further comprises at least one sheet forwarding cylinder which is disposed between the offset printing unit and the impression cylinder of the intaglio printing unit and which forwards the sheet subjected to offset printing in the offset printing unit to the impression cylinder of the intaglio printing unit. 
         [0016]    In addition, the security printing press for printing securities according to the present invention is characterized in that in the above-described security printing press, the offset printing unit is configured as one module formed of the offset printing section for one surface and the offset printing section for the other surface, and a plurality of the offset printing units are capable of being coupled. 
         [0017]    In addition, the security printing press for printing securities according to the present invention is characterized in that the above-described security printing press further comprises: checking means for one surface for detecting a printing condition of the one surface of the sheet, the checking means for one surface being disposed between a downstream side, in a transporting direction of the sheet, of a printing portion in the offset printing section for one surface that is located on the most downstream side in the transporting direction of the sheet and an upstream side, in the transporting direction of the sheet, of the impression cylinder of the intaglio printing unit, and checking means for the other surface for detecting a printing condition of the other surface of the sheet, the checking means for the other surface being disposed between a downstream side, in the transporting direction of the sheet, of a printing portion in the offset printing section for the other surface that is located on the most downstream side in the transporting direction of the sheet and an upstream side, in the transporting direction of the sheet, of the impression cylinder of the intaglio printing unit. 
         [0018]    In addition, the security printing press for printing securities according to the present invention is characterized in that the above-described security printing press further comprises: plate changing means for one surface for changing a printing plate for the plate cylinder for one surface, the plate changing means for one surface being provided in the offset printing section for one surface; and plate changing means for the other surface for changing a printing plate for the plate cylinder for the other surface, the plate changing means for the other surface being provided in the offset printing section for the other surface. 
       Advantageous Effects of Invention 
       [0019]    According to the security printing press of the present invention, printing is performed one surface of a sheet held on the impression cylinder for one surface by the blanket cylinder for one surface, the sheet is then gripped and held on the impression cylinder for the other surface, and printing is performed on the other surface of the sheet by the blanket cylinder for the other surface. In short, the security printing press employs alternate double-side printing. Therefore, when printing is performed on each of both surfaces of the sheet, the sheet is pressed against the blanket cylinder by the impression cylinder, making it possible to print sharp printing images on both surfaces of the sheet. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0020]      FIG. 1  is an overall schematic configuration diagram of a main embodiment of a security printing press according to the present invention. 
           [0021]      FIG. 2  is an enlarged diagram of an extracted part of an offset printing unit of the security printing press in  FIG. 1 . 
           [0022]      FIG. 3  is an enlarged diagram of an extracted part of an intaglio printing unit of the security printing press in  FIG. 1 . 
           [0023]      FIG. 4  is a schematic configuration diagram of a plate clamping device and a printing plate mounting device of an offset printing section for one surface of the security printing press in  FIG. 1 . 
           [0024]      FIG. 5  is a schematic configuration diagram of a plate clamping device and a printing plate mounting device of an offset printing section for the other surface of the security printing press in  FIG. 1 . 
           [0025]      FIG. 6  is a schematic configuration diagram of an oscillation adjusting device for an oscillating roller of the offset printing unit of the security printing press in  FIG. 1 . 
           [0026]      FIG. 7  is a control block diagram of the oscillation adjusting device and a sheet sorting device of the offset printing unit of the security printing press in  FIG. 1 . 
           [0027]      FIG. 8  is an overall schematic configuration diagram of another embodiment of the security printing press according to the present invention. 
           [0028]      FIG. 9  is an overall schematic configuration diagram of still another embodiment of the security printing press according to the present invention. 
           [0029]      FIG. 10  is an overall schematic configuration diagram of yet another embodiment of the security printing press according to the present invention. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0030]    Although embodiments of a security printing press according to the present invention will be described on the basis of the drawings, the present invention is not limited to only the embodiments which are described below on the basis of the drawings. 
       Main Embodiment 
       [0031]    A main embodiment of the security printing press according to the present invention will be described on the basis of  FIGS. 1 to 7 . 
       &lt;&lt;Overall Main Configuration&gt;&gt; 
       [0032]    As shown in  FIG. 1 , a transfer cylinder  120   a  of a first offset printing unit  120  is disposed on a leading end side of a feeder board  111  of a sheet feeding device  110 , which is sheet feeding means for feeding sheets  101  one by one. The transfer cylinder  120   a  is capable of receiving the sheets  101  one by one from the feeder board  111  via an unillustrated swing arm shaft pregripper. 
         [0033]    An impression cylinder  121   a  for one surface of the first offset printing unit  120  is in contact with the transfer cylinder  120   a  of the first offset printing unit  120 . A blanket cylinder  122   a  for one surface is in contact with the impression cylinder  121   a . A plate cylinder  123   a  for one surface is in contact with the blanket cylinder  122   a . An inking device  124   a  for one surface, which is ink supply means for one surface, and a dampening device  125   a  for one surface, which is a dampening means for one surface, are provided to the plate cylinder  123   a . The impression cylinder  121   a , the blanket cylinder  122   a , the plate cylinder  123   a , the inking device  124   a , the dampening device  125   a , as described above, and the like constitute an offset printing section for one surface of the first printing unit  120 . 
         [0034]    As shown in  FIG. 2 , the inking device  124   a  includes: two ink fountains  124   aa   1  and  124   aa   2  which are capable of containing inks of colors different from each other; fountain rollers  124   ab   1  and  124   ab   2  which take out the ink from the respective ink fountains  124   aa   1  and  124   aa   2 ; ink ductor rollers  124   ac   1  and  124   ac   2  which each have a large-diameter portion and a small-diameter portion at predetermined positions in an axial direction thereof and which receive the ink taken out by the respective fountain rollers  124   ab   1  and  124   ab   2  on only the large-diameter portions; a roller train  124   ae  to which the ink is transferred from the large-diameter portions of the ink ductor rollers  124   ac   1  and  124   ac   2  and which then sends the ink to the plate cylinder  123   a ; and oscillating rollers  124   ad   1  to  124   ad   4  which are disposed between the rollers of the roller train  124   ae  and which are capable of reciprocally moving in the axial direction. 
         [0035]    As shown in  FIG. 1 , an impression cylinder  121   b  for the other surface of the first offset printing unit  120  is in contact with the impression cylinder  121   a  at a position downstream of the position where the blanket cylinder  122   a  is in contact with the impression cylinder  121   a  in a rotation direction thereof. A blanket cylinder  122   b  for the other surface is in contact with the impression cylinder  121   b . A plate cylinder  123   b  for the other surface is in contact with the blanket cylinder  122   b . An inking device  124   b  for the other surface, which is ink supply means for the other surface, and a dampening device  125   b  for the other surface, which is dampening means for the other surface, are provided to the plate cylinder  123   b . The impression cylinder  121   b , the blanket cylinder  122   b , the plate cylinder  123   b , the inking device  124   b , the dampening device  125   b , as described above, and the like constitute an offset printing section for the other surface of the first offset printing unit  120 . 
         [0036]    As shown in  FIG. 2 , in the same manner as the inking device  124   a , the inking device  124   b  includes: two ink fountains  124   ba   1  and  124   ba   2  which are capable of containing inks of colors different from each other; fountain rollers  124   bb   1  and  124   bb   2  which take out the ink from the respective ink fountains  124   ba   1  and  124   ba   2 ; ink ductor rollers  124   bc   1  and  124   bc   2  which each have a large-diameter portion and a small-diameter portion at predetermined positions in an axial direction thereof and which receive the ink taken out by the respective fountain rollers  124   bb   1  and  124   bb   2  on only the large-diameter portions; a roller train  124   be  to which the ink is transferred from the large-diameter portions of the ink ductor rollers  124   bc   1  and  124   bc   2  and which then sends the ink to the plate cylinder  123   b ; and oscillating rollers  124   bd   1  to  124   bd   4  which are disposed between the rollers of the roller train  124   be  and which are capable of reciprocally moving in the axial direction. 
         [0037]    As shown in  FIG. 1 , an impression cylinder  131   a  for one surface of a second offset printing unit  130  is in contact with the impression cylinder  121   b  for the other surface of the first offset printing unit  120  at a position downstream of the position where the blanket cylinder  122   b  is in contact with the impression cylinder  121   b  in a rotation direction thereof. In the same manner as the first offset printing unit  120 , the second printing unit  130  includes a blanket cylinder  132   a , a plate cylinder  133   a , an inking device  134   a , a dampening device  135   a , and the like for one surface, which constitute an offset printing section for one surface thereof, and includes a blanket cylinder  132   b , a plate cylinder  133   b , an inking device  134   b , a dampening device  135   b , and the like for the other surface, which constitute an offset printing section for the other surface thereof. 
         [0038]    An impression cylinder  141   a  for one surface of a third offset printing unit  140  is in contact with the impression cylinder  131   b  for the other surface of the second offset printing unit  130  at a position downstream of the position where the blanket cylinder  132   b  is in contact with the impression cylinder  131   b  in a rotation direction thereof. In the same manner as the first and second printing units  120  and  130 , the third offset printing unit  140  includes a blanket cylinder  142   a , a plate cylinder  143   a , an inking device  144   a , and a dampening device  145   a , and the like for one surface, which constitute an offset printing section for one surface thereof, and includes a blanket cylinder  142   b , a plate cylinder  143   b , an inking device  144   b , and a dampening device  145   b  for the other surface, which constitute an offset printing section for the other surface thereof. 
         [0039]    An impression cylinder  151   a  for one surface of a fourth offset printing unit  150  is in contact with the impression cylinder  141   b  for the other surface of the third offset printing unit  140  at a position downstream of the position where the blanket cylinder  142   b  is in contact with the impression cylinder  141   b  in a rotation direction thereof. In the same manner as the first to third offset printing units  120 ,  130 , and  140 , the fourth offset printing unit  150  includes a blanket cylinder  152   a , a plate cylinder  153   a , an inking device  154   a , and a dampening device  155   a  for one surface, which constitute an offset printing section for one surface thereof, and includes a blanket cylinder  152   b , a plate cylinder  153   b , an inking device  154   b , and a dampening device  145   b  for the other surface, which constitute an offset printing section for the other surface thereof. 
         [0040]    A transport cylinder  171 Aa for one surface of a first drying unit  170 A is in contact with the impression cylinder  151   b  for the other surface of the fourth offset printing unit  150  at a position downstream of the position where the blanket cylinder  152   b  is in contact with the impression cylinder  151   b  in a rotation direction thereof. A dryer  172 Aa for one surface, which is drying means for one surface for drying the one surface of the sheet  101  subjected to printing in the first to fourth offset printing units  120 ,  130 ,  140 , and  150 , is disposed near the transport cylinder  171 Aa. A transport cylinder  171 Ab for the other surface is in contact with the transport cylinder  171 Aa at a position downstream of the position where the impression cylinder  151   b  for the other surface of the fourth offset printing unit  150  is in contact with the transport cylinder  171 Aa in a rotation direction thereof. A dryer  172 Ab for the other surface, which is drying means for the other surface for drying the other surface of the sheet  101  subjected to printing in the first to fourth offset printing units  120 ,  130 ,  140 , and  150 , is disposed near the transport cylinder  171 Ab. 
         [0041]    A screen printing unit  160  described in the aforementioned Patent Literature 3 is disposed such that an impression cylinder  161  thereof is in contact with the transport cylinder  171 Ab for the other surface of the first drying unit  170 A at a position downstream of the position where the transport cylinder  171 Aa for one surface is in contact with the transport cylinder  171 Ab in a rotation direction thereof. A rotary screen  162  is in contact with the impression cylinder  161 . A transport cylinder  163  is in contact with the impression cylinder  161  at a position downstream of the position where the rotary screen  162  is in contact with the impression cylinder  161  in a rotation direction thereof. 
         [0042]    A transport cylinder  171 B of a second drying unit  170 B is in contact with the transport cylinder  163  of the screen printing unit  160  at a position downstream of the position where the impression cylinder  161  is in contact with the transport cylinder  163  in a rotation direction thereof. A dryer  172 B, which is drying means for drying the one surface of the sheet  101  subjected to screen printing in the screen printing unit  160 , is disposed near the transport cylinder  171 B. 
         [0043]    A transport cylinder  173 B is in contact with the transport cylinder  171 B at a position downstream of the position where the transport cylinder  163  of the screen printing unit  160  is in contact with the transport cylinder  172 B in a rotation direction thereof. A transport cylinder  174 B is in contact with the transport cylinder  173 B at a position downstream of the position where the transport cylinder  171 B is in contact with the transport cylinder  173 B in a rotation direction thereof. A transfer cylinder  170 Ba is in contact with the transport cylinder  174 B at a position downstream of the position where the transport cylinder  173 B is in contact with the transport cylinder  174 B in a rotation direction thereof. 
         [0044]    An intaglio printing unit  180 , which is similar to the intaglio printing press described in the aforementioned Patent Literature 4, is disposed such that a transfer cylinder  180   a  thereof is in contact with the transfer cylinder  170 Ba of the drying unit  170 B at a position downstream of the position where the transport cylinder  174 B is in contact with the transfer cylinder  170 Ba in a rotation direction thereof. An impression cylinder  181  is in contact with the transfer cylinder  180   a  at a position downstream of the position where the transfer cylinder  170 Ba is in contact with the transfer cylinder  180   a  in a rotation direction thereof. 
         [0045]    As shown in  FIGS. 1 and 3 , an intaglio cylinder  182  is in contact with the impression cylinder  181 . An ink collecting cylinder  183  is in contact with the intaglio cylinder  182 . A plurality of ink form cylinders  184  (five in the embodiment) are in contact with the ink collecting cylinder  183  in such a manner as to be arranged along a circumferential direction thereof. Inking devices  185  for supplying inks are disposed on the peripheral side of these ink form cylinders  184 , correspondingly. The inking devices  185  are supported in a frame  180 A, which is capable of approaching and separating from the ink form cylinders  184 . A wiping roller  186  is in contact with the intaglio cylinder  182 . A wiping tank  187  is disposed below the wiping roller  186 . Note that in the embodiment, the ink collecting cylinder  183 , the ink form cylinders  184 , the inking devices  185 , and the like constitute ink supply means. 
         [0046]    As shown in  FIG. 1 , a delivery cylinder  113  of a delivery device  112  is in contact with the impression cylinder  181  at a position downstream of the position where the intaglio cylinder  182  is in contact with the impression cylinder  181  in a rotation direction thereof. An unillustrated sprocket is provided coaxially to the delivery cylinder  113 . An endless delivery chain  114  provided with a plurality of gripper bars is looped around the sprocket. A plurality of delivery piles  115 A to  115 C (three in the embodiment), each of which is a piling unit, are arranged in a running direction of the delivery chain  114  below the delivery chain  114 . 
         [0047]    Then, each of the first to fourth offset printing units  120 ,  130 ,  140 , and  150  constitutes one module including the offset printing section for one surface and the offset printing section for the other surface in the unit, and a plurality of the units are capable of being coupled and installed. Accordingly, the maximum number of colors required for printing can be easily set by changing the number of units. 
         [0048]    Note that in the embodiment, the impression cylinder  161  and the transport cylinder  163  of the screen printing unit  160 , the transport cylinder  171 Aa for one surface and the transport cylinder  171 Ab for the other surface of the first drying unit  170 A, the transfer cylinder  170 Ba, the transport cylinder  171 B, and the transport cylinders  173 B and  174 B of the second drying unit  170 B, and the transfer cylinder  180   a  of the intaglio printing unit  180  each constitute a sheet forwarding cylinder which forwards the sheet  101  subjected to offset printing in the offset printing units  120 ,  130 ,  140 , and  150  to the impression cylinder  181  of the intaglio printing unit  180 . 
       &lt;&lt;Plate Clamping Device of Plate Cylinder&gt;&gt; 
       [0049]    In addition, as shown in  FIGS. 3 and 4 , the plate cylinders  123   a ,  133   a ,  143   a , and  153   a  for one surface and the plate cylinders  123   b ,  133   b ,  143   b , and  153   b  for the other surface of the offset printing units  120 ,  130 ,  140 , and  150  each include a plate clamping device  40  described in the aforementioned Patent Literature 5. Each plate cylinder is thus capable of detachably holding a printing plate, such as a resin plate or a PS plate, on a peripheral surface of the plate cylinder by means of the plate clamping device  40 . 
       &lt;&lt;Printing Plate Mounting Device&gt;&gt; 
       [0050]    Moreover, the offset printing units  120 ,  130 ,  140 , and  150  each include printing plate mounting devices, described in the aforementioned Patent Literatures 6 and 7 and the like, near the plate cylinders  123   a  and  123   b ,  133   a  and  133   b ,  143   a  and  143   b , or  153   a  and  153   b . Thus, it is possible to semi-automatically mount the printing plate on each plate cylinders  123   a ,  133   a ,  143   a , or  153   a  for one surface via the plate clamping device  40  by means of the printing plate mounting device (plate changing means for one surface) provided near the plate cylinder  123   a ,  133   a ,  143   a , or  153   a  while it is possible to semi-automatically mount the printing plate on each plate cylinder  123   b ,  133   b ,  143   b , or  153   b  for the other surface via the plate clamping device  40  by means of the printing plate mounting device (plate changing means for the other surface) provided near the plate cylinder  123   b ,  133   b ,  143   b , or  153   b.    
         [0051]    Specifically, as shown in  FIG. 4 , a locking portion  45  is provided in an upper cover  36   a  of a safety cover  36  covering a front surface of the offset printing section for one surface of each of the offset printing units  120 ,  130 ,  140 , and  150 . The locking portion  45  is formed in an inverted L-shape in a side view and is configured to lock an end portion of a printing plate  1  on the trailing edge side. Reference signs  46  and  47  denote a pair of guide bars each formed in a bar shape. These guide bars  46  and  47  are supported, each at two ends thereof, respectively on upper and lower sides of a middle cover  36   b  of the safety cover  36  by supporting members  46   a  and  47   a , in parallel with an outer surface of the middle cover  36   b  at an interval therebetween, and such that the axes of the guide bars  46  and  47  extend in a width direction of the middle cover  36   b.    
         [0052]    A window  50  formed in a rectangle extending in a left-right direction is provided in an upper portion of a lower cover  36   c  of the safety cover  36 . A pair of left and right positioning pins  51  are fixed to the lower cover  36   c  via a supporting plate  52  at positions corresponding to lower end portions of the window  50 . As shown in the same drawing, the printing plate  1  is engaged with the positioning pins  51  to thus support a lower end of the printing plate  1  with the positioning pins  51  so that the printing plate  1  can be supported by the safety cover  36  before being mounted on the plate cylinder  123   a ,  133   a ,  143   a , or  153   a.    
         [0053]    A plate feeding unit  55  as a swing member generally includes: a swing plate  56  which selectively covers the window  50 ; and a suction pad  57  which sucks the printing plate  1 . A large number of holes, through which the suction pad  57  is exposed, are provided in a lower portion of the swing plate  56 . The swing plate  56  is supported on the middle cover  36   b  in such a manner as to be swingable about a pivot shaft  62  implanted on the lower cover  36   c  as the turning center. The suction pad  57  is supported in such a manner as to be movable on the back surface side of the swing plate  56  along a radial direction of the pivot shaft  62 , and is supplied with a suction air from an air intake pump whose illustration is omitted. 
         [0054]    The printing plate  1  is mounted in the following manner by the printing plate mounting device configured as described above. First, the end portion to be gripped (lower end portion in the drawing) of the printing plate  1  is engaged with the positioning pins  51 , so that the lower end of the printing plate  1  is supported with the positioning pins  51 . Next, the upper portion and the lower portion of the printing plate  1  are placed into contact with the pair of guide bars  46  and  47 . Thereafter, the upper end of the printing plate  1  is engaged with the locking portion  45 , so that the printing plate  1  is supported by the safety cover  36 . The printing plate  1  thus supported is bent largely in the side view between the pair of guide bars  46  and  47 . In this state, the lower end portion of the printing plate  1  is sucked by the suction pad  57  of the plate feeding unit  55 . 
         [0055]    Then, the plate feeding unit  55  is turned about the pivot shaft  62  serving as the turning center in the counterclockwise direction in the drawing to bring the lower end of the plate feeding unit  55  near the plate cylinder  123   a ,  133   a ,  143   a , or  153   a , so that the plate feeding unit  55  is positioned at an insertion position. In this event, the movement of the plate feeding unit  55  to the insertion position is utilized to release the engagement of the printing plate  1  and the positioning pins  51 . This configuration eliminates the need of dedicated drive means for moving the positioning pins  51 , thus simplifying the device and reducing the manufacturing costs. 
         [0056]    Subsequently, the suction pad  57  is moved to be brought near the plate cylinder  123   a ,  133   a ,  143   a , or  153   a  to insert the lower end (end portion to be gripped) of the printing plate  1  into the inside, on the gripping side, of the plate clamping device  40  of the plate cylinder  123   a ,  133   a ,  143   a , or  153   a . Thereafter, the suction of the printing plate  1  by the suction pad  57  is released, and thereby the lower end (end portion to be gripped) of the printing plate  1 , which has been held in the bending state by the suction pad  57 , is pressed against the inside, on the gripping side, of the plate clamping device  40  of the plate cylinder  123   a ,  133   a ,  143   a , or  153   a  by an elastic returning force generated by the bending, so that the printing plate  1  is positioned. 
         [0057]    On the other hand, as shown in  FIG. 4 , the offset printing section for the other surface of each printing unit  120 ,  130 ,  140 , or  150  is provided with a printing plate mounting device, which has a structure obtained by turning upside down the structure of the printing plate mounting device provided in the offset printing section for one surface. The printing plate mounting device of the offset printing section for the other surface is capable of operating in the same manner as that of the above-described printing plate mounting device of the offset printing section for one surface, thereby mounting the printing plate  1  on the plate cylinder  123   a ,  133   a ,  143   a ,  153   a , or  163   a.    
       &lt;&lt;Oscillation Adjusting Device for Oscillating Roller&gt;&gt; 
       [0058]    Moreover, the oscillating rollers  124   ad   1  to  124   ad   4 ,  134   ad   1  to  134   ad   4 ,  144   ad   1  to  144   ad   4 , and  154   ad   1  to  154   ad   4  of the inking devices  124   a ,  134   a ,  144   a , and  154   a  for one surface as well as the oscillating rollers  124   bd   1  to  124   bd   4 ,  134   bd   1  to  134   bd   4 ,  144   bd   1  to  144   bd   4 , and  154   bd   1  to  154   bd   4  of the inking devices  124   b ,  134   b ,  144   b , and  154   b  for the other surface, of the printing units  120 ,  130 ,  140 , and  150  are configured such that the oscillations of the oscillating rollers are adjustable for each of the inking devices  124   a ,  124   b ,  134   a ,  134   b ,  144   a ,  144   b ,  154   a , and  154   b  of the printing units  120 ,  130 ,  140 , and  150  by an oscillation adjusting device described in the aforementioned Patent Literature 8. 
         [0059]    Specifically, as shown in  FIG. 6 , each of the oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , and  124   bd   4  to  154   bd   4  is rotatably supported on the frame  1  with a shaft. A rotary shaft  6 , which is rotatably supported by a bearing  3  provided in the frame  1  and a bearing  5  of a first support plate  4  screwed to the frame  1 , is provided in a center portion substantially the same distance from the oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , and  124   bd   4  to  154   bd   4 . 
         [0060]    The rotary shaft  6  includes an inclined shaft portion  7  and a parallel shaft portion  8  arranged adjacent to each other. The inclined shaft portion  7  is configured to be inclined to the axis of the oscillating roller  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , or  124   bd   4  to  154   bd   4  while the parallel shaft portion  8  has an axis parallel to the axis of the oscillating roller  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , or  124   bd   4  to  154   bd   4 . At the parallel shaft portion  8 , the rotary shaft  6  is supported on the first support plate  4  and is directly connected to an oscillation drive motor (first drive means, a dedicated motor)  10  incorporating a rotary encoder  9  (see  FIG. 7 ), which is formed by a disk servo-motor or the like. The oscillation drive motor  10  is laterally attached to a second support plate  11  screwed to the first support plate  4 . 
         [0061]    A cylindrical sleeve  12 , which has an outer peripheral surface inclined to the axis of the inclined shaft portion  7  of the rotary shaft  6 , is fitted on the inclined shaft portion  7  in such a manner as to be rotatable but not movable in the axial direction. A disk (oscillating roller engagement member)  14  is supported on the outer peripheral surface of the sleeve  12  via a bearing  13  in such a manner as to be rotatable but not movable in the axial direction. A spherical body  16  provided on a shaft end of each oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , or  124   bd   4  to  154   bd   4  is fitted to a spherical bearing (engaging portion)  15  provided on an outer peripheral portion of the disk  14 . 
         [0062]    A fitting groove (engaging portion)  17  is formed in a part of an outer periphery of the sleeve  12 . A rotating member  19  having a fitting protrusion (engaged portion, such as a square pin, a round pin, a cam follower, or the like)  18  to be fitted into the fitting groove  17  is rotatably supported on the parallel shaft portion  8  of the rotary shaft  6  via a bearing  20 . 
         [0063]    An annular gear  21  is fitted on an outer periphery of the rotating member  19 . An output gear  22   a  of a harmonic drive (registered trademark) device  22 , serving as a differential mechanism, mounted on the first support plate  4  is in mesh with the annular gear  21 . On the other hand, an input gear  22   b  of the harmonic drive (registered trademark) device  22  is in mesh with a disk-shaped gear  23  fixedly provided on the parallel shaft portion  8  of the rotary shaft  6 . In addition, the rotation of an oscillation adjusting motor (second drive means, a dedicated motor)  26  incorporating a potentiometer  25  (see  FIG. 7 ), which is vertically attached to the second support plate  11 , is transmitted to a wave generator  22   c  of the harmonic drive (registered trademark) device  22  via a worm wheel  24   a  and a worm  24   b.    
         [0064]    The harmonic drive (registered trademark) device  22  is a known differential mechanism including, as basic elements: the wave generator  22   c ; a flex spline (not shown) fitted on an outer periphery of the wave generator  22   c ; and a pair of circular splines  22   d  in mesh with an outer periphery of the flex spline, in which the number of teeth of the circular splines  22   d  is two more than the number of teeth of the flex spline, and the output gear  22   a  is screwed into one of the circular splines  22   d  while the input gear  22   b  is screwed into the other circular spline  22   d , and the reduction ratio is determined by the numbers of teeth of the flex spline and the circular splines  22   d.    
         [0065]    Accordingly, during normal operation, stopping the oscillation adjusting motor  26  transmits the rotation of the oscillation drive motor  10  to the disk-shaped gear  23  the harmonic drive (registered trademark) device  22  the annular gear  21  and the rotating member  19  in a ratio of 1:1, so that the sleeve  12 , which rotates integrally with the rotating member  19 , rotates at the same number of revolutions as that of the rotary shaft  6 . On the other hand, rotating the oscillation adjusting motor  26  generates a slight difference in rotation between the disk-shaped gear  23 , which is rotated by the oscillation drive motor  10 , and the annular gear  21  and rotating member  19  due to the reduction action of the harmonic drive (registered trademark) device  22 . The slight difference in rotation causes phase adjustment between the rotary shaft  6  (inclined shaft portion  7 ) and the sleeve  12 , so that the oscillation of each oscillating roller  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , or  124   bd   4  to  154   bd   4  is adjusted. After the adjustment, stopping the oscillation adjusting motor  26  causes the number of revolutions of the sleeve  12  to return to the initial number of revolutions (the same number of revolutions as that of the rotary shaft  6 ). 
         [0066]    Further, as shown in  FIG. 7 , the rotary encoder  9  and the potentiometer  25  are electrically connected to an input unit of a control device  190 , which is control means. An output unit of the control device  190  is electrically connected to the motors  10  and  26 . The control device  190  is thus capable of controlling the operations of the motors  10  and  26  on the basis of signals from the rotary encoder  9  and the potentiometer  25 . 
         [0067]    During normal operation, the oscillation adjusting device configured as described above rotates the oscillation drive motor  10  in a state where the oscillation adjusting motor  26  is stopped. This causes the sleeve  12  to rotate at the same number of revolutions as that of the rotary shaft  6  (inclined shaft portion  7 ) and the disk  14  to precess in conjunction with the precession of the inclined shaft portion  7 , as described above. As a result, the oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , and  124   bd   4  to  154   bd   4  are caused to oscillate in the axial direction sequentially at different phases and in a predetermined oscillation. 
         [0068]    In this event, after initial position synchronization is performed between the initial position of the oscillation drive motor  10  and the initial position of the prime motor, the initial position of the oscillation drive motor  10  is shifted by a predetermined amount from the initial position of the prime motor, thereby adjusting the oscillation phase of each of the oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , and  124   bd   4  to  154   bd   4  to a predetermined oscillation phase. 
         [0069]    Then, under the above-described conditions, rotating the oscillation adjusting motor  26  causes a slight difference in rotation between the disk-shaped gear  23 , which is rotated by the oscillation drive motor  10 , and the annular gear  21  and rotating member  19  due to the action of the harmonic drive (registered trademark) device  22 . The slight difference in rotation causes phase adjustment between the rotary shaft  6  (inclined shaft portion  7 ) and the sleeve  12 , so that the oscillation of each oscillating roller  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , or  124   bd   4  to  154   bd   4  is changed by the amount of rotation of the oscillation adjusting motor  26 . As a result, the oscillation of the oscillating roller  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 , or  124   bd   4  to  154   bd   4  is adjusted to the predetermined oscillation. 
       &lt;&lt;Sheet Sorting Device&gt;&gt; 
       [0070]    In addition, as shown in  FIG. 1 , release cams  116 A to  116 C, which are release means for releasing gripper devices of the gripper bars of the delivery chain  114 , are disposed near the delivery chain  114  on the respective delivery piles  115 A to  115 C of the delivery device  112 . Elevating devices (see  FIG. 6 )  117 A and  117 B, such as air cylinders, which are approach and separation means, are coupled respectively to the two release cams  116 A and  116 B located closer to the delivery cylinder  113  among the release cams  116 A to  116 C. The elevating devices  117 A and  117 B are configured to move up and down to cause the corresponding release cams  116 A and  116 B to approach or separate from the delivery chain  114 . 
         [0071]    Moreover, a checking camera  191   a  for one surface, which is checking means for one surface for detecting a printing condition of one surface of the sheet  101 , is disposed near the transport cylinder  174 B of the second drying unit  170 B, in other words, between a downstream side, in the transporting direction of the sheet  101 , of a position (printing portion) where the impression cylinder  151   a  and the blanket cylinder  152   a  are in contact with each other in the offset printing section for one surface of the fourth offset printing unit  150 , which is located on the most downstream side in the transporting direction of the sheet  101 , and an upstream side, in the transporting direction of the sheet  101 , of the impression cylinder  181  of the intaglio printing unit  180 . In addition, a checking camera  191   b  for the other surface, which is checking means for the other surface for detecting a printing condition of the other surface of the sheet  101 , is disposed near the transport cylinder  173 B, in other words, between a downstream side, in the transporting direction of the sheet  101 , of a position (printing portion) where the impression cylinder  151   b  and the blanket cylinder  152   b  are in contact with each other in the offset printing section for the other surface of the fourth offset printing unit  150 , which is located on the most downstream side in the transporting direction of the sheet  101 , and an upstream side, in the transporting direction of the sheet  101 , of the impression cylinder  181  of the intaglio printing unit  180 . 
         [0072]    As shown in  FIG. 7 , the checking cameras  191   a  and  191   b  are electrically connected to the input unit of the control device  190 . The output unit of the control device  190  is electrically connected to the elevating devices  117 A and  117 B. The control device  190  is thus capable of causing the elevating devices  117 A and  117 B to move up and down on the basis of signals from the checking cameras  191   a  and  191   b.    
       &lt;&lt;Printing Operation&gt;&gt; 
       [0073]    Next, an operation of the security printing press  100  according to the embodiment will be described. 
         [0074]    When the sheet  101  is fed one by one from the sheet feeding device  110 , the sheet  101  is transferred from the feeder board  111 , the feedboard  112 , and the swing arm shaft pregripper  113 , through the transfer cylinder  120   a  of the first offset printing unit  120 , to the impression cylinder  121   a . As a result, the sheet  101  is held on the impression cylinder  121   a  with the one surface being on the front side. 
         [0075]    The inks filled in the respective ink fountains  124   aa   1  and  124   aa   2  of the inking device  124   a  are taken out by the respective fountain rollers  124   ab   1  and  124   ab   2 , and are transported to the roller train  124   ae  by the respective ink ductor rollers  124   ac   1  and  124   ac   2 . Then, part of the inks is mixed into a rainbow state by the above-described reciprocating motions of the oscillating rollers  124   ad   1  to  124   ad   4  in the axial direction, and transported to the plate cylinder  123   a . The ink is thus transferred onto the blanket cylinder  122   a  with a printing image corresponding to the pattern of the plate cylinder  123   a.    
         [0076]    Then, the sheet  101  passes between the impression cylinder  121   a  and the blanket cylinder  122   a , and thereby the ink, which has been transferred in the rainbow state on the surface of the blanket cylinder  122   a , is transferred onto one surface of the sheet  101  held on the peripheral surface of the impression cylinder  121   a.    
         [0077]    The sheet  101  with the one surface subjected to rainbow printing on the impression cylinder  121   a  is transported to and gripped on the impression cylinder  121   b , so that the sheet is held on the impression cylinder  121   b  with the other surface being on the front side. 
         [0078]    Moreover, the inks filled in the respective ink fountains  124   ba   1  and  124   ba   2  of the inking device  124   b  are taken out by the respective fountain rollers  124   bb   1  and  124   bb   2 , and are transported to the roller train  124   be  by the respective ink ductor rollers  124   bc   1  and  124   bc   2 . Then, part of the inks is mixed into a rainbow state by the above-described reciprocating motions of the oscillating rollers  124   bd   1  to  124   bd   4  in the axial direction, and transported to the plate cylinder  123   b . The ink is thus transferred onto the blanket cylinder  122   b  with a printing image corresponding to the pattern of the plate cylinder  123   b.    
         [0079]    Then, the sheet  101  passes between the impression cylinder  121   b  and the blanket cylinder  122   b , and thus the ink, which has been transferred in the rainbow state on the surface of the blanket cylinder  122   b , is transferred onto the other surface of the sheet  101  held on the peripheral surface of the impression cylinder  121   b.    
         [0080]    The sheet  101  with the other surface subjected to rainbow printing on the impression cylinder  121   b  is transported to and gripped on the impression cylinder  131   a  of the second offset printing unit  130 , so that the sheet is held on the impression cylinder  131   a  with the one surface being on the front side. 
         [0081]    Successively, the sheet  101  is subjected to rainbow printing on the one surface and subjected to rainbow printing on the other surface in the second offset printing unit  130  in the same manner as the first offset printing unit  120 , and then is transferred to the third printing unit  140 . 
         [0082]    Thereafter, the sheet  101  is subjected to the rainbow printing in the third and fourth offset printing units  140  and  150  in the same manner as the first offset printing unit  120 . Thereafter, the sheet  101  is gripped on the transport cylinder  171 Aa for one surface of the first drying unit  170 A, and the ink on the one surface is dried by the dryer  172 Aa for one surface while the sheet  101  is held and transported by the transport cylinder  171 Aa with the one surface being on the front side. Then, the sheet  101  is gripped on the transport cylinder  171 Ab for the other surface, and the ink on the other surface is dried by the dryer  172 Ab for the other surface while the sheet  101  is held and transported by the transport cylinder  171 Ab with the other surface being on the front side. 
         [0083]    Next, the sheet  101  is gripped on the impression cylinder  161  of the screen printing unit  160 . The sheet  101  is then subjected to screen printing on the one surface by the rotary screen  162  while being held and transported by the impression cylinder  161  with the one surface being on the front side. Thereafter, the sheet  101  is gripped on the transport cylinder  171 B of the second drying unit  170 B via the transport cylinder  163 , and the ink screen-printed on the one surface of the sheet  101  is dried by the dryer  172 B while the sheet  101  is held and transported by the transport cylinder  171 Ba with the one surface being on the front side. 
         [0084]    Subsequently, the sheet  101  is gripped on the transport cylinder  173 B, and the printing condition of the other surface is detected by the checking camera  191   b  while the sheet  101  is held and transported by the transport cylinder  173 B with the other surface being on the front side. Then, the sheet  101  is gripped on the transport cylinder  174 B, and the printing condition of the one surface is detected by the checking camera  191   a  while the sheet  101  is held and transported by the transport cylinder  174 B with the one surface being on the front side. Thereafter, the sheet  101  is gripped on the impression cylinder  181  of the intaglio printing unit  180  via the transfer cylinders  170 Ba and  180   a , so that the sheet  101  is held on the peripheral surface of the impression cylinder  181  with the other surface being on the front side. 
         [0085]    The inks in the respective inking devices  185  are transferred to the ink collecting cylinder  183  via the ink form cylinders  184 , and supplied to the intaglio cylinder  182 . The excess of the inks is wiped out by the wiping roller  186  and cleaned and removed in the wiping tank  187 . 
         [0086]    Then, the sheet  101  passes between the impression cylinder  181  and the intaglio cylinder  182 , and thereby the inks, which has been supplied to the intaglio plate of the intaglio cylinder  182 , are transferred to the other surface of the sheet  101  held on the peripheral surface of the impression cylinder  181 , and thereafter, the sheet  101  is held and transported by the gripper bar of the delivery chain  114  via the transport cylinder  170   a  of the delivery device  112 . 
         [0087]    The control device  190  judges whether or not the printing conditions of the one surface and the other surface of the sheet  101  are appropriate on the basis of signals from the checking cameras  191   a  and  191   b . When judging that the printing conditions of both the one surface and the other surface of the sheet  101  are appropriate, the control device  190  activates one of the elevating devices  117 A and  117 B to cause a corresponding one of the release cams  116 A and  116 B to approach the delivery chain  114 , and activates the other one of the elevating devices  117 A and  117 B to cause the corresponding other one of the release cams  116 A and  116 B to separate from the delivery chain  114 . 
         [0088]    In this way, the gripper device of the gripper bar of the delivery chain  114 , which is holding and transporting the sheet  101 , comes into contact with the one of the release cams  116 A and  116 B and is thus released, so that the sheet  101  is delivered and piled on a corresponding one of the delivery piles  115 A and  115 B (the delivery pile located below the one of the release cams  116 A and  116 B). 
         [0089]    Once the number of sheets piled on the one of the delivery piles  115 A and  115 B as described above reaches a predetermined number, the control device  190  activates the other one of the elevating devices  117 A and  117 B to cause the corresponding other one of the release cams  116 A and  116 B to approach the delivery chain  114 , and activates the one of the elevating devices  117 A and  117 B to cause the corresponding one of the release cams  116 A and  116 B to separate from the delivery chain  114 . 
         [0090]    In this way, the gripper device of the gripper bar of the delivery chain  114 , which is holding and transporting the sheet  101 , comes into contact with the other one of the release cams  116 A and  116 B and is thus released, so that the sheet  101  is delivered and piled on the other one of the delivery piles  115 A and  115 B (the delivery pile located below the other one of the release cams  116 A and  116 B). Accordingly, after the delivery pile to pile the sheets  101  is switched, the sheets  101  piled up to the predetermined number on the one of the delivery piles  115 A and  115 B can be carried out. Therefore, the printing products can be carried out without stopping the printing on the sheets  101 . 
         [0091]    On the other hand, when judging that the printing condition of any of the one surface and the other surface of the sheet  101  is not appropriate, the control device  190  activates the elevating devices  117 A and  117 B to cause the release cams  116 A and  116 B to separate from the delivery chain  114 . 
         [0092]    In this way, the sheet  101  held by the gripper device of the gripper bar of the delivery chain  114  passes through above the delivery piles  115 A and  115 B without being delivered onto the delivery piles  115 A and  115 B. Then, the gripper device comes into contact with the release cam  116 C and is released, so that the sheet  101  is delivered on the delivery pile  115 C and piled as a wasted sheet. 
         [0093]    Therefore, the security printing press  100  according to the embodiment can provide the following advantageous effects. 
         [0000]    (1) In each of the offset printing units  120 ,  130 ,  140 , and  150 , one surface of the sheet  101  held on the impression cylinder  121   a ,  131   a ,  141   a , or  151   a  with the one surface being on the front side is subjected to offset printing by the blanket cylinder  122   a ,  132   a ,  142   a , or  152   a , and then, the other surface of the sheet  101 , which is then gripped and held on the impression cylinder  121   b ,  131   b ,  141   b , or  151   b  with the other surface being on the front side, is subjected to offset printing by the blanket cylinder  122   b ,  132   b ,  142   b , or  152   b . In short, the security printing press  100  employs alternate double-sided printing. Therefore, the sheet  101  is pressed against the blanket cylinders  122   a ,  132   a ,  142   a ,  152   a ,  122   b ,  132   b ,  142   b , and  152   b  by the respective impression cylinders  121   a ,  131   a ,  141   a ,  151   a ,  121   b ,  131   b ,  141   b , and  151   b , making it possible to perform offset printing of sharp printing images on both surfaces of the sheet  101 , and continuously perform intaglio printing on the sheet  101  in the intaglio printing unit  180  in line.
 
(2) The plate cylinders  123   a ,  123   b ,  133   a ,  133   b ,  143   a ,  143   b ,  153   a , and  153   b  of the offset printing units  120 ,  130 ,  140 , and  150  each include the plate clamping device  40  described in the aforementioned Patent Literature 5 and the like. Therefore, a printing plate, such as a resin plate or a PS plate, can be easily held detachably on the peripheral surface of each plate cylinder.
 
(3) The offset printing units  120 ,  130 ,  140 , and  150  each include the printing plate mounting device described in the aforementioned Patent Literatures 6 and 7 and the like. Therefore, a printing plate, such as a resin plate or a PS plate, can be easily mounted on each of the plate cylinders  123   a ,  123   b ,  133   a ,  133   b ,  143   a ,  143   b ,  153   a , and  153   b , making it possible to significantly reduce the burden on the worker.
 
(4) In the offset printing units  120 ,  130 ,  140 , and  150 , the inking devices  124   a ,  134   a ,  144   a , and  154   a  for one surface and the inking devices  124   b ,  134   b ,  144   b , and  154   b  for the other surface each include the two ink fountains  124   aa   1  to  154   aa   1 ,  124   aa   2  to  154   aa   2 ,  124   ba   1  to  154   ba   1 ,  124   ba   2  to  154   ba   2 , the fountain rollers  124   ab   1  to  154   ab   1 ,  124   ab   2  to  154   ab   2 ,  124   bb   1  to  154   bb   1 ,  124   bb   2  to  154   bb   2 , the ink ductor rollers  124   ac   1  to  154   ac   1 ,  124   ac   2  to  154   ac   2 ,  124   bc   1  to  154   bc   1 ,  124   bc   2  to  154   bc   2 , and the oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 ,  124   bd   4  to  154   bd   4 . In addition, the oscillating rollers  124   ad   1  to  154   ad   1 ,  124   ad   2  to  154   ad   2 ,  124   ad   3  to  154   ad   3 ,  124   ad   4  to  154   ad   4 ,  124   bd   1  to  154   bd   1 ,  124   bd   2  to  154   bd   2 ,  124   bd   3  to  154   bd   3 ,  124   bd   4  to  154   bd   4  are each configured such that the oscillation thereof can be adjusted by the oscillation adjusting device described in the aforementioned Patent Literature 8 and the like. Therefore, an ink distribution appropriate for rainbow printing can be easily obtained.
 
(5) The printing conditions of the one surface and the other surface of the sheet  101  with the one surface and the other surface subjected to printing are detected respectively by the checking cameras  191   a  and  191   b . The control device  19  then controls the operations of the elevating devices  117 A and  117 B on the basis of signals from the checking cameras  191   a  and  191   b , such that the sheets are sorted to be piled on the delivery piles  115 A and  115 B for appropriately printed sheets and the delivery pile  115 C for wasted sheets. Therefore, the working efficiency can be improved.
 
(6) Each combination of the impression cylinder  121   a ,  121   b ,  131   a ,  131   b ,  141   a ,  141   b ,  151   a , or  151   b  and the blanket cylinder  122   a ,  122   b ,  132   a ,  132   b ,  142   a ,  142   b ,  152   a , or  152   b  is provided with the plate cylinder  123   a ,  123   b ,  133   a ,  133   b ,  143   a ,  143   b ,  153   a , or  153   b  and the inking device  124   a ,  124   b ,  134   a ,  134   b ,  144   a ,  144   b ,  154   a , or  154   b . Accordingly, a space is provided between the plate cylinder  123   a ,  123   b ,  133   a ,  133   b ,  143   a ,  143   b ,  153   a , or  153   b  and the inking device  124   a ,  124   b ,  134   a ,  134   b ,  144   a ,  144   b ,  154   a , or  154   b  which are adjacent to each other. This eliminates the need for securing a working space for performing the printing preparation work or the maintenance and inspection work, such as the refilling of the ink, the cleaning of the rubber blanket, and the changing of the printing plate, thus allowing the work to be easily performed. In addition, since the plate cylinders  123   a ,  123   b ,  133   a ,  133   b ,  143   a ,  143   b ,  153   a , and  153   b , the inking devices  124   a ,  124   b ,  134   a ,  134   b ,  144   a ,  144   b ,  154   a , or  154   b , and the like are arranged side by side in the horizontal direction, this allows the worker to perform the work at ease. Therefore, the burden on the worker can be significantly reduced.
 
(7)
 
         [0094]    Each of the offset printing units  120 ,  130 ,  140 , and  150  is configured of a module formed by providing each combination of the impression cylinder  121   a ,  131   a ,  141   a , or  151   a  and the blanket cylinder  122   a ,  132   a ,  142   a , or  152   a  for one surface and the impression cylinder  121   b ,  131   b ,  141   b , or  151   b  and the blanket cylinder  122   b ,  132   b ,  142   b , or  152   b  for the other surface with the corresponding plate cylinder  123   a ,  123   b ,  133   a ,  133   b ,  143   a ,  143   b ,  153   a , or  153   b  and inking device  124   a ,  124   b ,  134   a ,  134   b ,  144   a ,  144   b ,  154   a , or  154   b  and the like, and a plurality of the printing units are capable of being coupled and installed. Therefore, the maximum number of colors required for printing can be easily set by changing the number of units to be installed. 
       Other Embodiments 
       [0095]    Note that, in the above-described embodiment, description has been given to the security printing press  100  configured by including the four offset printing units (first to fourth offset printing units)  120 ,  130 ,  140 , and  150 , the first drying unit  170 A, the screen printing unit  160 , the second drying unit  170 B, and the intaglio printing unit  180  including the ink collecting cylinder  183 , the following is also possible as other embodiments. For example, it is possible to configure, as shown in  FIG. 8 , a security printing press  200  including: six offset printing units (first to six offset printing units)  120 ,  130 ,  140 ,  150 ,  220 , and  230 ; a first drying unit  170 A; and an intaglio printing unit  180  including an ink collecting cylinder  183  while omitting the screen printing unit  160  and the second drying unit  170 B. Further, it is also possible to configure, as shown in  FIG. 9 , a security printing press  300  including: six offset printing units (first to six offset printing units)  120 ,  130 ,  140 ,  150 ,  220 , and  230 ; a first drying unit  170 A; and an intaglio printing unit  380  in which four ink form cylinders  184  are indirect contact with an intaglio cylinder  182  while omitting the ink collecting cylinder  183  of the intaglio printing unit  180 . 
         [0096]    Moreover, in the above-described embodiments, description has been given to the security printing presses  100 ,  200 , and  300  configured by including: the offset printing units  120 ,  130 ,  140 ,  150 ,  220 , and  230  each including the offset printing section for one surface and the offset printing section for the other surface; and the first drying unit  170 A, which dries both the one surface and the other surface of the sheet  101 . Alternatively, for example, it is possible to configure, as shown in  FIG. 10 , a security printing press  400  including: offset printing units  420 ,  430 ,  440 ,  450 ,  460 , and  470  each including only the offset printing section for the other surface; and a drying unit  480  which dries only the other surface of the sheet  101 , which makes it possible to print securities requiring a printing image on only the other surface of the sheet  101 . 
       INDUSTRIAL APPLICABILITY 
       [0097]    The security printing press according to the present invention is capable of performing offset printing of sharp printing images on a sheet and continuously performing intaglio printing on the sheet in line, and accordingly is very useful to be utilized in the manufacture of banknotes such as bank bills and securities such as stock certificates and bond certificates. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           100  security printing press 
           101  sheet 
           110  sheet feeding device 
           111  feeder board 
           112  delivery device 
           113  delivery cylinder 
           114  delivery chain 
           115 A to  115 C delivery pile 
           116 A to  116 C release cam 
           117 A,  117 B elevating device 
           120  first offset printing unit 
           120   a  transfer cylinder for one surface 
           121   a  impression cylinder for one surface 
           122   a  blanket cylinder for one surface 
           123   a  plate cylinder for one surface 
           124   a  inking device for one surface 
           124   aa   1 ,  124   aa   2  ink fountain 
           124   ab   1 ,  124   ab   2  fountain roller 
           124   ac   1 ,  124   ac   2  ink ductor roller 
           124   ad   1  to  124   ad   4  oscillating roller 
           124   ae  roller train 
           125   a  dampening device for the other surface 
           120   b  transfer cylinder for the other surface 
           121   b  impression cylinder for the other surface 
           122   b  blanket cylinder for the other surface 
           123   b  plate cylinder for the other surface 
           124   b  inking device for the other surface 
           124   ba   1 ,  124   ba   2  ink fountain 
           124   bb   1 ,  124   bb   2  fountain roller 
           124   bc   1 ,  124   bc   2  ink ductor roller 
           124   bd   1  to  124   bd   4  oscillating roller 
           124   be  roller train 
           125   b  dampening device for the other surface 
           130  second offset printing unit 
           131   a  impression cylinder for one surface 
           132   a  blanket cylinder for one surface 
           133   a  plate cylinder for one surface 
           134   a  inking device for one surface 
           134   aa   1 ,  134   aa   2  ink fountain 
           134   ab   1 ,  134   ab   2  fountain roller 
           134   ac   1 ,  134   ac   2  ink ductor roller 
           134   ad   1  to  134   ad   4  oscillating roller 
           134   ae  roller train 
           135   a  dampening device for the other surface 
           130   b  transfer cylinder for the other surface 
           131   b  impression cylinder for the other surface 
           132   b  blanket cylinder for the other surface 
           133   b  plate cylinder for the other surface 
           134   b  inking device for the other surface 
           134   ba   1 ,  134   ba   2  ink fountain 
           134   bb   1 ,  134   bb   2  fountain roller 
           134   bc   1 ,  134   bc   2  ink ductor roller 
           134   bd   1  to  134   bd   4  oscillating roller 
           134   be  roller train 
           135   b  dampening device for the other surface 
           140  third offset printing unit 
           141   a  impression cylinder for one surface 
           142   a  blanket cylinder for one surface 
           143   a  plate cylinder for one surface 
           144   a  inking device for one surface 
           144   aa   1 ,  144   aa   2  ink fountain 
           144   ab   1 ,  144   ab   2  fountain roller 
           144   ac   1 ,  144   ac   2  ink ductor roller 
           144   ad   1  to  144   ad   4  oscillating roller 
           144   ae  roller train 
           145   a  dampening device for the other surface 
           140   b  transfer cylinder for the other surface 
           141   b  impression cylinder for the other surface 
           142   b  blanket cylinder for the other surface 
           143   b  plate cylinder for the other surface 
           144   b  inking device for the other surface 
           144   ba   1 ,  144   ba   2  ink fountain 
           144   bb   1 ,  144   bb   2  fountain roller 
           144   bc   1 ,  144   bc   2  ink ductor roller 
           144   bd   1  to  144   bd   4  oscillating roller 
           144   be  roller train 
           145   b  dampening device for the other surface 
           150  fourth offset printing unit 
           151   a  impression cylinder for one surface 
           152   a  blanket cylinder for one surface 
           153   a  plate cylinder for one surface 
           154   a  inking device for one surface 
           154   aa   1 ,  154   aa   2  ink fountain 
           154   ab   1 ,  154   ab   2  fountain roller 
           154   ac   1 ,  154   ac   2  ink ductor roller 
           154   ad   1  to  154   ad   4  oscillating roller 
           154   ae  roller train 
           155   a  dampening device for the other surface 
           150   b  transfer cylinder for the other surface 
           151   b  impression cylinder for the other surface 
           152   b  blanket cylinder for the other surface 
           153   b  plate cylinder for the other surface 
           154   b  inking device for the other surface 
           154   ba   1 ,  154   ba   2  ink fountain 
           154   bb   1 ,  154   bb   2  fountain roller 
           154   bc   1 ,  154   bc   2  ink ductor roller 
           154   bd   1  to  154   bd   4  oscillating roller 
           154   be  roller train 
           155   b  dampening device for the other surface 
           160  screen printing unit 
           161  impression cylinder 
           162  rotary screen 
           163  transport cylinder 
           170 A first drying unit 
           171 Aa transport cylinder for one surface 
           172 Aa drier for one surface 
           171 Ab transport cylinder for the other surface 
           172 Ab drier for the other surface 
           170 B second drying unit 
           170 Ba transfer cylinder 
           171 B transport cylinder 
           172 B drier 
           173 B,  174 B transport cylinder 
           180  intaglio printing unit 
           180 A frame 
           180   a  transfer cylinder 
           181  impression cylinder 
           182  intaglio cylinder 
           183  ink collecting cylinder 
           184  ink form cylinder 
           185  inking device 
           186  wiping roller 
           187  wiping tank 
           190  control device 
           191   a  checking camera for one surface 
           191   b  checking camera for the other surface 
           200  security printing press 
           220  fifth offset printing unit 
           230  sixth offset printing unit 
           300  security printing press 
           380  intaglio printing unit 
           400  security printing press 
           420  first offset printing unit 
           430  second offset printing unit 
           440  third offset printing unit 
           450  fourth offset printing unit 
           460  fifth offset printing unit 
           470  sixth offset printing unit 
           480  drying unit