Patent Publication Number: US-2012037019-A1

Title: Printing cylinder device and rotary press comprising printing cylinder device

Description:
TECHNICAL FIELD 
     The present invention relates to a printing cylinder device and a rotary press comprising the printing cylinder device. 
     BACKGROUND ART 
     A general offset press comprises printing cylinders (a plate cylinder, a blanket cylinder, and an impression cylinder), an inking device for transferring ink in a film form to the plate cylinder, and a dampening solution supplier for transferring a predetermined amount of water. 
     In the offset press, the inking device transfers, to the printing plates which are locked up to the plate cylinders, a necessary amount of ink in a film form delivered for each printing column adapted to an image to be printed. And the dampening solution supplier also supplies water to non-image portions. The ink is then transferred to the blanket cylinder. Further, the ink transferred to the blanket cylinder is transferred to printing paper (hereinafter referred to as “web”) fed from a paper feeder. In this way, the image to be printed is printed on one side or both sides of the web. 
     The above-mentioned printing cylinders are arranged in various forms depending on the kind of printing unit. 
     Now, the arrangement of the printing cylinders is described with reference to the drawings. 
       FIG. 5  shows a schematic diagram for explaining the arrangement of the printing cylinders according to the present invention. 
     In  FIG. 5(   a ), a B-B unit is shown. The B-B unit has a pair of horizontally arranged plate cylinders P, and blanket cylinders B disposed for the respective plate cylinders P. Web is fed into a space between the pair of blanket cylinders B. 
     In  FIG. 5(   b ), a satellite-shaped unit is shown. The satellite-shaped unit has, in its center, an impression cylinder I which has a circumference substantially twice the circumference of the plate cylinder P and the blanket cylinder B. The blanket cylinders B, the plate cylinders P, an inking device (not shown), and a dampening solution supplier (not shown) are arranged on the circumference of the impression cylinder I. Web is fed to the circumferential surface of the impression cylinder I. This unit is capable of four-color printing on one side. 
     In  FIG. 5(   c ), a horizontal B-B unit is shown. The horizontal B-B unit has two sets of blanket cylinders B and plate cylinders. P that are substantially vertically arranged. Web is fed into a space between the pair of blanket cylinders B. This unit is capable of double-side printing. 
     In  FIG. 5(   d ), a horizontal unit comprising an impression cylinder is shown. The horizontal unit has one set of a blanket cylinder B and a plate cylinder P that is substantially vertically arranged for one impression cylinder I. Web is fed into a space between the impression cylinder I and the blanket cylinder B. This unit is capable of single-side printing. 
       FIG. 6  shows a schematic diagram for explaining the arrangement of the printing cylinders in tower units according to the present invention. 
     In  FIG. 6(   a ), an arch-shaped tower unit is shown. The arch-shaped tower unit has four steps of B-B units shown in  FIG. 5(   a ), and is capable of simultaneous four-color printing on both sides of web. 
     In  FIG. 6(   b ), an H-shaped unit is shown. The H-shaped unit has four steps of B-B units shown in  FIG. 5(   a ) (the B-B units of the second and fourth steps from the bottom are turned 180°), and is capable of simultaneous four-color printing on both sides of web. 
     In each case, ink transferred to the plate cylinder P is transferred to the blanket cylinder B, and the blanket cylinder B prints an image to be printed on the web. In this case, an amount of ink necessary to form the image has to be&#39;passed between the plate cylinder P and the blanket cylinder B. The ink also has to be passed from the blanket cylinder B to the web between the blanket cylinders B or between the blanket cylinder B and the impression cylinder I. Thus, the cylinders that are in line contact with each other are uniformly pressurized. 
     It should be noted that the pressurization force of the plate cylinder P and the blanket cylinder B is referred to as transfer impression. The pressurization force of the blanket cylinders B, or the pressurization force of the blanket cylinder B and the impression cylinder I, that is, the pressurization force to transfer ink to the web is referred to as printing impression. 
     Meanwhile, in the recent printing industry, there have been demands for improved printing quality, increased printing efficiency, and reduced running costs in a rotary press. 
     First, regarding the printing quality, there has been developed a technique that allows the transfer impression and the printing impression to be uniform at printable speeds of a press (at any speed from a low-speed range to a high-speed range). This technique is a basic and important technique in offset printing. There have also been developed techniques associated with printing elements for an inking method and a dampening solution supplying method. Moreover, various techniques have been suggested in various fields in connection with the material and structure of a blanket attached to the blanket cylinder, the component of the ink, a dampening solution, and web. 
     Regarding the increased printing efficiency, there have been developed a technique for increasing the printing speed, and a technique for printing on web which is widened in its the breadth direction as much as the page width of a material to be printed. 
     For example, in order to increase the printing speed, it is necessary to improve the processing speed of a folder for folding printed web in the final process of the rotary press, and to stabilize a device for guiding the web to the folder after printing and also stabilize tension from a low-speed range to a high-speed range in the traveling process of the web. That is, development of various techniques is demanded. 
     Regarding the increase of a printable breadth, it is necessary to increase the breadth of the above-mentioned printing cylinder, inking device, and dampening solution supplier. That is, a rotor such as the printing cylinder needs to be increased in length. 
     For example, if the printing cylinders are increased in length without any change in the support structure of the printing cylinders, the printing cylinders bend, and the respective printing cylinders cannot maintain uniform pressurization force. This causes difficulty in passing a proper amount of ink or dampening solution, and adversely affects the printing quality and the like. 
     Now, a rotary press according to the present invention is described with reference to the drawings. 
       FIG. 7  shows a schematic diagram for explaining the rotary press according to the present invention. 
     In  FIG. 7 , the rotary press according to the present invention is a newspaper web offset press  200 . This newspaper web offset press  200  comprises a plurality of paper feeders (reel splicer)  3 , printing units U 1 , U 2 , U 3 , U 4 , and U 5 , a upper structure  4 , and a folder  5 . 
     The paper feeders  3  feed web to the printing units U 1 , U 2 , U 3 , U 4 , and U 5  so as to brake a rolled sheet to a certain extent. The respective paper feeders  3  are installed to correspond to the printing units U 1 , U 2 , U 3 , U 4 , and U 5 , and supply a generally manufactured rolled sheet having a width equal to four pages of a newspaper to the printing units U 1 , U 2 , U 3 , U 4 , and U 5 . 
     The printing units U 1 , U 2 , U 3 , U 4 , and U 5  print on one surface or both surfaces of the web fed from the paper feeders  3 . That is, the printing units U 1  and U 5  are H-shaped tower units which are capable of simultaneously printing up to four colors on both sides of the web. The printing units U 2 , U 3 , and U 4  are B-B units which are capable of simultaneously printing up to two colors on both sides of the web. 
     The upper structure  4  with web guide rollers cuts the printed web (traveling web having a four-page width) in the center of the traveling direction as needed. The upper structure  4  then guides the cut web (traveling web having a two-page width) to the folder  5  in a stacked state in a specified order. 
     Furthermore, the folder  5  longitudinally folds, into a one-page width, the web (traveling web having a two-page width) which has been stacked by the upper structure  4 . The folder  5  then cuts the web into a one-page length, folds the web into the form of a newspaper, and delivers the newspapers. 
     The newspaper web offset press  200  having the above-described configuration is generally capable of printing, at the maximum, a total of 40 pages including 16 four-color pages and 24 two-color pages. 
     In the printing units U 1 , U 2 , U 3 , U 4 , and U 5 , the blanket cylinder B equipped with the blanket and the plate cylinder P equipped with the printing plates have a lateral size substantially equal to the four-page width of a newspaper, and a circumference equal to two pages of a newspaper in the longitudinal direction. In the newspaper web offset press  200 , the size of a general blanket is equal to the two-page width×two-page length of a newspaper. Two blankets are attached to the blanket cylinder B. 
     The size of the printing plate attached to the plate cylinder P is generally 1L1W, 1L2W, 2L1W, or 2L2W (note that L is the length (longitudinal length) of one page of a newspaper, and W is the width (lateral length) of one page of a newspaper). Therefore, in order to fill the circumferential surface of the plate cylinder P, for example, eight printing plates are attached when the size of the printing plate is 1L1W, and two printing plates are attached when the size of the printing plate is 2L2W. 
     In the newspaper web offset press  200 , a printing plate for a replacement article may be reattached between the start of printing and the completion of printing. The replacement article may be, for example, an article called a local edition (an article that varies by delivery zone), an article on sports or an election for which the quickness of reporting the progress is important, or a commercial article that varies by delivery zone. When an article is replaced, the printing plate with which the relevant page is being printed is changed, and the printing plate for the replacement article is reattached. 
     In this case, since the circumference of the plate cylinder P is equal to two pages of a newspaper in its longitudinal direction, two printing plates need to be changed to replace one page of an article. This leads to increased running costs and a heavy burden in printing having a small circulation or in printing that includes frequent plate replacement. Printing efficiency also decreases as the time for replacing two printing plates is longer than the time for replacing one printing plate. Accordingly, there is a demand for a rotary press comprising a printing cylinder device that is equipped with the plate cylinder P having a circumference equal to one page of a newspaper in its longitudinal direction. 
     If the circumference of the plate cylinder P that does not need the replacement of the printing plate is changed from a length equal to two pages of a newspaper in its longitudinal direction to a length equal to one page of a newspaper in its longitudinal direction, the number of necessary printing plates can be reduced to one from two. 
     The demand for the plate cylinder P having a circumference equal to one page of a newspaper in its longitudinal direction has arisen from an improvement in the printing durability of recent printing plates. That is, the recent printing plates have a longer life span before image portions (portions to which ink adheres) or non-image portions (portions to which the dampening solution adheres but ink does not adhere) are damaged by the adverse effect of, for example, pressurized contact (contact with the blanket cylinder B, an inking roller, and a dampening solution putting roller), slippage, or paper dust sticking to traveling web. Therefore, development has been made to such a degree that no damage is caused within the normal number of copies printed per set by the newspaper web offset press  200  even if the circumference of the plate cylinder P is equal to one page of a newspaper in its longitudinal direction. 
     As described above, in the recent printing industry, there have been demands for improved printing quality, increased printing efficiency, and reduced running costs in rotary press. In order to meet these demands, a technique that allows uniform transfer impression and printing impression even when the printing cylinder is rotating at high speed is fundamental and important in the offset printing. 
     Moreover, reducing the circumference of the plate cylinder P by half is equal to reducing the cylinder diameter by half. According to conventional techniques (e.g. a conventional printing cylinder technique in Patent document 1 described later), bending of the plate cylinder P reaches an amount that cannot be compensated for by a surface rubber layer or a cushion layer of the blanket attached to the blanket cylinder B. That is, it is impossible to obtain uniform pressurization, here, transfer impression between plate cylinder and blanket cylinder that is fundamental in printing quality. 
     In order to change the foregoing circumstances, various techniques have been developed. 
     For example, according to the printing cylinder technique disclosed in Patent document 1, a concentric ring-shaped groove is axially pierced from both end faces in a sleeve that supports a journal portion of a printing cylinder. This printing cylinder has an elastic material filling the axially pierced ring-shaped groove. 
     [Patent Document 1]
     Japanese Patent Publication Laid-open No. 9-141826   

     However, according to Patent document 1, the ends on both sides of a cylinder middle portion of the printing cylinder (a portion corresponding to the ring-shaped groove) deform so as to offset the bending of the axially central portion of the cylinder middle portion, and uniform printing impression is thus obtained in the width direction. On the other hand, the disadvantage of this technique is that if the printing cylinder is rotated at high speed so that the axially central portion of the cylinder middle portion is bent, the printing cylinder bounds because of reaction force of the bending, and uniform pressurization is not obtained. Problems such as increased load on a bearing and the abrasion of the cylinder middle portion caused by the bounding are also conceivable. 
     Furthermore, as described above, there have been demands that improved printing quality, increased printing efficiency, and reduced running costs in rotary press be achieved by a technique that allows uniform transfer impression and printing impression even when the fundamental and important technique in the offset printing, that is, the printing cylinder is rotating at high speed. 
     DISCLOSURE OF THE INVENTION 
     The present invention has been suggested to solve the problems described above, and is directed to provide a printing cylinder device and a rotary press comprising a printing cylinder device that enable to improve printing quality, to increase printing efficiency, to reduce running costs and the like. 
     In order to achieve the foregoing object, a printing cylinder device according to the present invention comprises a printing cylinder having insertion holes formed in both end faces thereof, bearing support members having insertion portions inserted in the insertion holes and attachment portions fixed to frames, and printing cylinder bearings which are provided on at least the ends of the insertion portions and which rotatably support the printing cylinder. 
     A rotary press comprising a printing cylinder device of the present invention uses the printing cylinder device according to any one of claims  1  to  5  for at least one of a plate cylinder, a blanket cylinder, and an impression cylinder. 
     According to the printing cylinder device and the rotary press comprising the printing cylinder device of the present invention, improved printing quality, increased printing efficiency, reduced running costs and the like can be achieved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  shows a schematic sectional view of essential parts on the driving side of a printing cylinder device according to a first embodiment of the present invention; 
         FIG. 1B  shows a schematic sectional view of essential parts on the operating side of the printing cylinder device according to the first embodiment of the present invention; 
         FIG. 2A  shows a schematic sectional view of essential parts on the driving side of a printing cylinder device according to a second embodiment of the present invention; 
         FIG. 2B  shows a schematic sectional view of essential parts on the operating side of the printing cylinder device according to the second embodiment of the present invention; 
         FIG. 3A  shows a schematic sectional view of essential parts on the driving side of a printing cylinder device according to a third embodiment of the present invention; 
         FIG. 3B  shows a schematic sectional view of essential parts on the operating side of the printing cylinder device according to the third embodiment of the present invention; 
         FIG. 4  shows a schematic diagram for explaining a rotary press according to one embodiment of the present invention; 
         FIG. 5  shows a schematic diagram for explaining the arrangement of printing cylinders according to the present invention; 
         FIG. 6  shows a schematic diagram for explaining the arrangement of printing cylinders in tower units according to the present invention; and 
         FIG. 7  shows a schematic diagram for explaining the rotary press according to the present invention. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     First Embodiment of Printing Cylinder Device 
       FIG. 1A  shows a schematic sectional view of essential parts on the driving side of a printing cylinder device according to a first embodiment of the present invention. 
       FIG. 1B  shows a schematic sectional view of essential parts on the operating side of the printing cylinder device according to the first embodiment of the present invention. 
     In  FIGS. 1A and 1B , a printing cylinder device  1  according to the present embodiment comprises a printing cylinder  10 , a driving-side bearing support sleeve  20 , a printing cylinder driving shaft  30 , an operating-side bearing support sleeve  50 , and a printing cylinder position adjusting shaft  60 . This printing cylinder device  1  is generally used in place of the above-mentioned plate cylinder P of the newspaper web offset press  200 . It is to be noted that printing plate lockup system and the like are not shown in  FIGS. 1A and 1B . 
     Furthermore, the printing cylinder device  1  according to the present embodiment is used in place of the plate cylinder P of the newspaper web offset press  200 , but is not limited thereto. That is, the printing cylinder device  1  can be used for a printing cylinder (at least one of a plate cylinder, a blanket cylinder, and an impression cylinder) of a rotary press comprising printing units having various configurations. 
     (Printing Cylinder) 
     The printing cylinder  10  has an axial size equal to the four-page width of a newspaper, and a circumference equal to one page of a newspaper in its longitudinal direction. Insertion holes  11  having a predetermined depth and steps are pierced in the printing cylinder  10  in both end faces (driving-side end face and operating-side end face) along its central axis. 
     It should be understood that the two insertion holes  11  are not particularly limited in diameter (diameter at a position corresponding to an insertion portion  22 ) and depth (depth at a position corresponding to a printing cylinder bearing  24 ). 
     Although the insertion holes  11  of about the same shape are formed in both end faces of the printing cylinder  10  in the present embodiment, the present invention is not limited thereto. For example, insertion holes  11  of different shapes may be formed. 
     Furthermore, as shown in  FIG. 1A , a middle-stage step  111 , a lower step  112 , and a fit hole are formed in the driving-side insertion hole  11  in this order toward the inner side of this insertion hole. An outer ring of the printing cylinder bearing  24  comes into contact with the middle-stage step  111 . A flange of a drive transmission member  12  is screwed to the lower step  112 . The drive transmission member  12  is inserted into the fit hole. 
     The drive transmission member  12  comprises the above-mentioned flange, and a cylindrical portion. A spline hole as a torque transmitting portion is made in the cylindrical portion to transmit torque to the printing cylinder  10  to which the flange is screwed. The central axis of the spline hole corresponds to the central axis of the printing cylinder  10 . 
     Here, if the torque transmitting portion comprises the spline hole and a spline shaft  33 , the printing cylinder driving shaft  30  can be easily attached. Since the drive transmission member  12  can axially move when the spline shaft  33  is loaded in the spline hole, the printing cylinder  10  can be axially moved. 
     Although the torque transmitting portion comprises the axially movable spline hole and spline shaft  33  in the present embodiment, the torque transmitting portion is not limited thereto. For example, an axially movable internal gear, and an external gear fitted to the internal gear may be used. 
     The outer ring of the driving-side printing cylinder bearing  24  is fitted into collision with the middle-stage step  111  of the driving-side insertion hole  11 . A (hole) bearing snap ring  113  is further provided as an axial fixing member for the outer ring of the printing cylinder bearing  24 . In a substantially similar manner, the outer ring of an operating-side printing cylinder bearing  54  is fitted into collision with a middle-stage step  111  of the operating-side insertion hole  11 . A (hole) bearing snap ring  113  is further provided as an axial fixing member for the outer ring of the printing cylinder bearing  54 . 
     Furthermore, as shown in  FIG. 1B , the middle-stage step  111 , a lower step  112 , and a fit hole are formed in the operating-side insertion hole  11  in this order toward the inner side of this insertion hole. The outer ring of the printing cylinder bearing  54  comes into contact with the middle-stage step  111 . A flange portion  62  of the printing cylinder position adjusting shaft  60  is screwed to the lower step  112 . A fit portion  63  is inserted into the fit hole. 
     The flange portion  62  of the printing cylinder position adjusting shaft  60  has a shape substantially similar to the shape of the flange of the drive transmission member  12 . The fit portion  63  is in a cylindrical shape having substantially the same outside diameter as that of the cylindrical portion of the drive transmission member  12  and having a small axial length. As described above, this fit portion  63  is inserted into the fit hole located at the end of the insertion hole  11 , and the flange portion  62  is thereby screwed to the lower step  112  so that the central axis of the printing cylinder  10  corresponds to the central axis of the printing cylinder position adjusting shaft  60 . 
     (Driving-Side Bearing Support Sleeve) 
     The driving-side bearing support sleeve  20  as a bearing support member comprises a substantially cylindrical attachment portion  21  which is loaded into a boring of a driving-side frame  41 , the substantially cylindrical insertion portion  22  inserted into the insertion hole  11  of the printing cylinder  10 , and a flange portion  23  formed integrally with the driving side of the attachment portion  21 . 
     The flange portion  23  is screwed to the driving-side frame  41  so that the attachment portion  21  is loaded in the boring of the driving-side frame  41 . A predetermined step is formed on the operating side of the inner surface of the attachment portion  21 , and an outer ring of a bearing  36  fixed to the printing cylinder driving shaft  30  is fitted into collision with the step. Moreover, an outer ring of a bearing  34  fixed to the printing cylinder driving shaft  30  is fitted into the driving side of the inner surface of the attachment portion  21 . The outer ring of the bearing  34  is positioned and fixed by a bearing holder  28  screwed to the end face of the driving side of the attachment portion  21  so that the printing cylinder driving shaft  30  may not come off toward the driving side. 
     The insertion portion  22  is shaped to be smaller in outside diameter than the attachment portion  21  and to be substantially equal in thickness to the attachment portion  21 . The insertion portion  22  is formed integrally with the attachment portion  21 . At the end of this insertion portion  22 , a predetermined step, an outer circumferential surface, and an external screw are formed to attach an inner ring of the printing cylinder bearing  24 . 
     Here, the driving-side bearing support sleeve  20  is fixed to the driving-side frame  41  so that the central axis of the outer circumferential surface (which is generally lathed and cylindrically ground and is therefore the same as the central axis of the driving-side bearing support sleeve  20 ) corresponds to the central axis of the printing cylinder  10 . 
     When the correspondence between the central axis of the driving-side bearing support sleeve  20  and the central axis of the printing cylinder  10  is difficult due to the processing condition of the boring of the driving-side frame  41 , the attachment portion  21  that comes into contact with the boring of the driving-side frame  41   b  can be eccentrically processed a slight distance (e.g. several mm) for adjustment with respect to the central axis of the printing cylinder  10 . 
     The printing cylinder bearing  24  is, for example, a cylindrical roller bearing (without a collar) that allows its outer ring and inner ring to be axially movable or separable relative to each other. For example, an N-shaped cylindrical roller bearing has an inner ring that is provided with a roller and has an outer ring that is axially movable or separable. The inner ring of the printing cylinder bearing  24  is fitted into collision with the step so that the end of the insertion portion  22  is inserted into the inner ring of the printing cylinder bearing  24 , and the inner ring of the printing cylinder bearing  24  is then fixed by a bearing lock nut washer  27  and a bearing lock nut  26  via a stepped collar  25 . 
     Thus, the outer ring and inner ring of the printing cylinder bearing  24  are separable. Therefore, the outer ring of the printing cylinder bearing  24  is first fixed by the (hole) bearing snap ring  113 , and then the inner ring and roller of the printing cylinder bearing  24  fixed to the insertion portion  22  are inserted into the outer ring of the printing cylinder bearing  24 , so that the printing cylinder bearing  24  can be assembled. 
     The outer ring and inner ring of the printing cylinder bearing  24  are axially movable relative to each other. Therefore, the printing cylinder  10  can axially move a predetermined distance. The printing cylinder bearing  24  only bears a radial load. 
     The printing cylinder bearing  24  is not exclusively the cylindrical roller bearing, and can be, for example, a bearing such as a needle roller bearing that allows its outer ring and inner ring to be axially movable or separable relative to each other and that can bear a radial load. 
     (Printing Cylinder Driving Shaft) 
     The printing cylinder driving shaft  30  has a flange portion  31 , an external screw  32 , a spline shaft  33  and the like, from the driving side to the operating side. The printing cylinder driving shaft  30  also has a predetermined step in the vicinity of the flange portion  31 . The bearing  34  is fitted in until the inner ring comes into collision with this step. Further, a distance collar  35  is fitted in, and then the bearing  36  is fitted in. These components are fixed by a bearing lock nut washer  39  and a bearing lock nut  38  via a stepped collar  37 . That is, the bearing lock nut  38  is tightened to the external screw  32 . 
     The bearings  34  and  36  are generally bearings that can bear a radial load and an axial load. 
     The printing cylinder driving shaft  30  to which the bearing  34  and the bearing  36  are attached are inserted into the driving-side bearing support sleeve  20  so that its central axis corresponds to the central axis of the printing cylinder  10 . As a result of this insertion, the spline shaft  33  fits into the spline hole of the drive transmission member  12 . As described above, the printing cylinder driving shaft  30  is fitted in until the outer ring of the bearing  36  comes into collision with the predetermined step formed in the inner surface of the attachment portion  21 , and the outer ring of the bearing  34  fixed to the printing cylinder driving shaft  30  is fitted into the driving side of the inner surface of the attachment portion  21 . The outer ring of the bearing  34  is positioned and fixed by the bearing holder  28  screwed to the end face of the driving side of the attachment portion  21  so that the printing cylinder driving shaft  30  may not come off toward the driving side. As a result, the printing cylinder driving shaft  30  is axially positioned. 
     A printing cylinder driving gear  42  rotationally driven by a driving source (not shown) is screwed to the flange portion  31  of the printing cylinder driving shaft  30  projecting to the driving side of the driving-side frame  41 . The printing cylinder driving gear  42  has the attachment holes. Since each of the attachment holes of the printing cylinder driving gear  42  is an arc-shaped long hole into which a fixing bolt is inserted and which corresponds to the central axis of the printing cylinder driving gear  42 , the circumferential position of the printing cylinder  10  can be adjusted. 
     The driving source may be obtained by a gear train from a general motor. Alternatively, the printing cylinder driving gear  42  may be replaced with a bevel gear, and the corresponding bevel gear may be attached to and engaged with the end of a motor (not shown) and directly driven by the motor. 
     (Operating-Side Bearing Support Sleeve) 
     The operating-side bearing support sleeve  50  as a bearing support member comprises a substantially cylindrical attachment portion  51  which is loaded into a boring of an operating-side frame  43 , a substantially cylindrical insertion portion  52  inserted into the insertion hole  11  of the printing cylinder  10 , and a flange portion  53  formed integrally with the operating side of the attachment portion  51 . 
     The flange portion  53  is screwed to the operating-side frame  43  so that the attachment portion  51  is loaded into the boring of the operating-side frame  43 . A loading hole for loading, for example, a bearing holder  67  is pierced in the flange portion  53  and the attachment portion  51  from the operating side. The bearing holder  67  and a bearing holder  68  are axially movably loaded into this loading hole. The bearing holder  67  holds an outer ring of a bearing  64  having its inner ring fixed to the printing cylinder position adjusting shaft  60  by a bearing lock nut  65 . The bearing holder  68  is screwed to the bearing holder  67 . 
     An internal screw  681  is formed in the end face of the bearing holder  68 . The bearing holder  67  and the bearing holder  68  can be axially moved by using the internal screw  681 . Although not shown, this moving means may use, for example, a position adjusting bolt that is supported in an axially immobile state. As a result, if the position adjusting bolt is screwed (rotated clockwise) to the internal screw  681 , the bearing holder  67  and the bearing holder  68  move to the operating side. If the position adjusting bolt is loosened (rotated counterclockwise), the bearing holder  67  and the bearing holder  68  move to the driving side. That is, if the position adjusting bolt is tightened or loosened, the printing cylinder position adjusting shaft  60  moves to the driving side or the operating side (in the lateral directions of  FIGS. 1A and 1B ), and the printing cylinder  10  is moved. 
     The above-mentioned moving means is not exclusively configured to use the position adjusting bolt, and, for example, may be configured to use a cylinder for moving the bearing holder  68 . Alternatively, the moving means may be configured to be remotely controllable by using a stepping motor for rotating the position adjusting bolt. 
     The insertion portion  52  is shaped to be smaller in outside diameter than the attachment portion  51 . The insertion portion  52  is formed integrally with the attachment portion  51 . At the end of this insertion portion  52 , a predetermined step, an outer circumferential surface, and an external screw are formed to attach an inner ring of the printing cylinder bearing  54 . 
     Here, the operating-side bearing support sleeve  50  is fixed to the operating-side frame  43  so that the central axis of the outer circumferential surface (which is generally lathed and cylindrically ground and is therefore the same as the central axis of the operating-side bearing support sleeve  50 ) corresponds to the central axis of the printing cylinder  10 . 
     As described above, when the correspondence between the central axis of the operating-side bearing support sleeve  50  and the central axis of the printing cylinder  10  is difficult due to the processing condition of the boring of the operating-side frame  43 , the attachment portion  51  that comes into contact with the boring of the operating-side frame  43  can be eccentrically processed a slight distance (e.g. several mm) for adjustment with respect to the central axis of the printing cylinder  10 . 
     The printing cylinder bearing  54  is substantially similar to the above-mentioned printing cylinder bearing  24  and is, for example, a cylindrical roller bearing (without a collar) that allows its outer ring and inner ring to be axially movable or separable relative to each other. 
     The inner ring of the printing cylinder bearing  54  is fitted into collision with the step so that the end of the insertion portion  52  is inserted into the inner ring of the printing cylinder bearing  54 , and inner ring of the printing cylinder bearing  54  is then fixed by a bearing lock nut washer  57  and a bearing lock nut  56  via a stepped collar  55 . 
     Thus, the outer ring and inner ring of the printing cylinder bearing  54  are separable. Therefore, the outer ring of the printing cylinder bearing  54  is first fixed by the (hole) bearing snap ring  113 , and then the inner ring and roller of the printing cylinder bearing  54  fixed to the insertion portion  52  are inserted into the outer ring of the printing cylinder bearing  54 , so that the printing cylinder bearing  54  can be assembled. As described later, after the printing cylinder position adjusting shaft  60  is attached to the printing cylinder  10 , the outer ring of the printing cylinder bearing  54  is fitted into collision with the middle-stage step  111  of the operating-side insertion hole  11 , and fixed by the (hole) bearing snap ring  113 . 
     The outer ring and inner ring of the printing cylinder bearing  54  are axially movable relative to each other. Therefore, the printing cylinder  10  can axially move a predetermined distance. The printing cylinder bearing  54  only bears a radial load. 
     The printing cylinder bearing  54  is not exclusively the cylindrical roller bearing, and can be, for example, a bearing such as a needle roller bearing that allows its outer ring and inner ring to be axially movable or separable relative to each other and that can bear a radial load. 
     (Printing Cylinder Position Adjusting Shaft) 
     The printing cylinder position adjusting shaft  60  has the flange portion  62  and the fit portion  63  that are formed at the driving-side end, and has an external screw  61  and the like that are formed at the operating-side end. 
     The fit portion  63  is cylindrical, and is inserted in the fit hole of the operating-side insertion hole  11 . The flange portion  62  is screwed to the lower step  112 . The flange portion  62  is screwed before the insertion portion  52  is inserted into the insertion hole  11 . At this point, since the fit portion  63  functions as a positioning portion, the printing cylinder position adjusting shaft  60  is attached to the printing cylinder  10  so that its central axis corresponds to the central axis of the printing cylinder  10 . The printing cylinder position adjusting shaft  60  is inserted into the insertion hole  11  before the printing cylinder  10  is positioned at a predetermined boring. 
     In the present embodiment, after the printing cylinder position adjusting shaft  60  is attached to the printing cylinder  10 , the outer ring of the printing cylinder bearing  54  is then fitted into collision with the middle-stage step  111  of the operating-side insertion hole  11 , and fixed by the (hole) bearing snap ring  113 . 
     Furthermore, the printing cylinder position adjusting shaft  60  is positioned substantially in the center of the boring of the operating-side frame  43 . In this condition, the insertion portion  52  of the operating-side bearing support sleeve  50  is inserted into the insertion hole  11  via the boring of the operating-side frame  43 , and the operating-side bearing support sleeve  50  is fixed to the operating-side frame  43 . As a result, the inner ring and outer ring of the printing cylinder bearing  54  are engaged, and the printing cylinder bearing  54  bears the printing cylinder  10 . 
     The printing cylinder position adjusting shaft  60  has, in the vicinity of the external screw  61 , a predetermined step with which an inner ring of the bearing  64  comes into collision. 
     Here, the procedure for attaching the bearing  64  is described. 
     First, the outer ring of the bearing  64  is fitted into the bearing holder  67 , and the bearing holder  67  to which the bearing  64  is attached is then fitted into a loading hole of the attachment portion  51 . Further, the bearing holder  67  to which the bearing  64  is attached is loaded into the loading hole of the attachment portion  51  until the inner ring of the bearing  64  comes into collision with the predetermined step located in the vicinity of the external screw  61 . The inner ring of the bearing  64  is then fixed by a bearing lock nut washer  66  and the bearing lock nut  65 , and the bearing holder  68  is screwed to the bearing holder  67 . 
     The bearing  64  is generally a bearing that can bear a radial load and an axial load. 
     Now, the operation of the printing cylinder device  1  having the above configuration and others are described. 
     First, a drive motor (not shown) transmits torque to the printing cylinder driving gear  42  via the gear train or directly. 
     The printing cylinder driving shaft  30  then rotates, and the spline shaft  33  transmits the received torque to the drive transmission member  12 . The printing cylinder driving shaft  30  is supported by the bearings  34  and  36 , can bear a radial load and an axial load, and does not axially move. 
     When the torque is transmitted to the drive transmission member  12 , the printing cylinder  10  rotates. 
     The printing cylinder  10  is supported by the printing cylinder bearing  24 , the printing cylinder bearing  54 , and the bearing  64 . That is, the printing cylinder bearing  24  and the printing cylinder bearing  54  can only bear a radial load, and the bearing  64  can bear an axial load (and a radial load). 
     In the present embodiment, the bearings  34 ,  36  and  64  can also support the radial load of the printing cylinder  10 . Moreover, the bearings  34  and  36  can support an axial load when the printing cylinder  10  is axially moved. 
     Here, the printing cylinder device  1  is not limited to the configuration in which the two bearings, that is, the printing cylinder bearing  24  and the printing cylinder bearing  54  bear the radial load of the printing cylinder  10 . For example, the printing cylinder device  1  may have a configuration in which one or two or more printing cylinder bearings  24  are further provided on the driving side of the printing cylinder bearing  24  and one or two or more printing cylinder bearings  54  are further provided on the operating side of the printing cylinder bearing  54 . This allows further inhibition of the bending of the printing cylinder  10 , and thus enables a further speed increase and a greater length of the printing cylinder  10 . Moreover, printing quality in high-speed printing can be improved. 
     The newly added bearings are generally the same bearings as the printing cylinder bearing  24  and the printing cylinder bearing  54 , but are not limited thereto. For example, bearings greater in size than the printing cylinder bearing  24  and the printing cylinder bearing  54  may be used. 
     The configuration according to the present embodiment comprises one bearing  64 , but is not limited thereto. For example, bearings may be provided at two places in a substantially similar manner as the bearing  34  and the bearing  36  of the printing cylinder driving shaft  30 . This makes it possible to bear a higher axial load (and radial load). 
     Furthermore, the printing cylinder device  1  according to the present embodiment comprises the printing cylinder position adjusting shaft  60 , the bearing  64 , the bearing holder  67 , and the bearing holder  68 , and can thereby axially move the printing cylinder  10 . That is, when the axial movement of the printing cylinder  10  needs to be adjusted, the bearing holder  67  and the bearing holder  68  move to the operating side if the above-mentioned position adjusting bolt is tightened (rotated clockwise) to the internal screw  681 , and the bearing holder  67  and the bearing holder  68  move to the driving side if the position adjusting bolt is loosened (rotated counterclockwise). Thus, the axial position of the printing cylinder  10  coupled to the printing cylinder position adjusting shaft  60  is adjusted. 
     Now, the bending amount of the printing cylinder  10  in the printing cylinder device  1  is described. 
     During printing, the surface of the printing cylinder  10  is pressurized by printing impression and transfer impression substantially in the form of line contact, and the printing cylinder  10  is bent by the impression. 
       Maximum bending amount=(5/384)× W×L   4   /EI   Equation (1)
 
     In Equation (1), W is a uniformly distributed load, L is an inter-bearing distance, and EI is flexural rigidity. 
     According to Equation (1), the inter-bearing distance L is the major factor for the structural factor associated with the bending of the printing cylinder  10 . 
     The flexural rigidity EI is a factor associated with the diameter (outside diameter), length, and material of the printing cylinder  10 . However, the outside diameter and length of the printing cylinder  10  in the rotary press comprising the printing cylinder device are related to a printed matter size. For example, in the case of Japanese newspaper, since the longitudinal one-page length is 546 mm, the outside diameter of the printing cylinder  10  is about 546/πmm, and since the lateral four-page width is 1626 mm, the length of the printing cylinder  10  is about 1740 mm. A generally used material is cast steel or stainless steel. The use of some other highly rigid material such as titanium steel leads to a significant cost increase. 
     In the printing cylinder device  1 , the printing cylinder bearing  24  is attached to the end of the driving-side bearing support sleeve  20 , the printing cylinder bearing  54  is attached to the end of the operating-side bearing support sleeve  50 , and the driving-side bearing support sleeve  20  and the operating-side bearing support sleeve  50  are inserted into the insertion hole  11 . Therefore, L (inter-bearing distance) can be effectively reduced. That is, when the printing cylinder  10  of the printing cylinder device  1  is a plate cylinder, the maximum bending amount can be inhibited to a degree that can be absorbed by the rubber layer or cushion layer of the uniform blanket even if the printing cylinder  10  is rotated to a maximum speed range in a pressurized state. Thus, uniform transfer impression that is fundamental in printing quality can be ensured for the blanket cylinder (not shown). 
     The driving-side bearing support sleeve  20  and the operating-side bearing support sleeve  50  project a predetermined length from the driving-side frame  41  and the operating-side frame  43 , and are slightly bent. However, the driving-side bearing support sleeve  20  and the operating-side bearing support sleeve  50  are fixed to the driving-side frame  41  and the operating-side frame  43  and do not rotate, and are therefore kept slightly bent and have no adverse effect on the bending of the printing cylinder  10 . 
     Regarding printing efficiency, the printing cylinder  10  of the printing cylinder device  1  has an axial size substantially equal to the four-page width of a newspaper, and a circumference equal to one page of a newspaper in its longitudinal direction, so that the number of produced printing plates attached to the plate cylinder can be reduced by half. Even when the printing plate is frequently changed, the time for producing and replacing the printing plate can be reduced, and running costs can be reduced. 
     Furthermore, the printing cylinder device  1  is also suitably applicable to the printing cylinder  10  for printing increased in breadth. 
     As described above, according to the printing cylinder device  1  in the present embodiment, even when high-speed printing is performed, high printing quality can be achieved, and printing efficiency can be improved including a one-page to two-page increase of a printable range in the breadth direction. Moreover, it is possible to reduce running costs by reducing, by half, replacement printing plates or printing plates that do not need to be replaced during a plate change. 
     Furthermore, the printing cylinder device  1  according to the present embodiment has various applications. 
     For example, although the printing cylinder device  1  according to the present embodiment is configured to rotate the printing cylinder  10  by using, for example, the printing cylinder driving shaft  30 , the present invention is not limited thereto. 
     Second Embodiment of Printing Cylinder Device 
       FIG. 2A  shows a schematic sectional view of essential parts on the driving side of a printing cylinder device according to a second embodiment of the present invention. 
       FIG. 2B  shows a schematic sectional view of essential parts on the operating side of the printing cylinder device according to the second embodiment of the present invention. 
     A printing cylinder device  1   a  according to the present embodiment in  FIGS. 2A and 2B  is different from the printing cylinder device  1  according to the first embodiment described above in that no printing cylinder position adjusting shaft  60  is provided and so on. The configuration according to the present embodiment is substantially similar in other respects to the configuration of the printing cylinder device  1 . 
     Accordingly, components in  FIGS. 2A and 2B  similar to those in  FIGS. 1A and 1B  are given the same signs, and are not described in detail. Although the printing cylinder device  1   a  according to the present embodiment and a later-described printing cylinder device  1   b  are used in place of a blanket cylinder B of a newspaper web offset press  200 , but the present invention is not limited thereto. That is, the printing cylinder devices  1   a  and  1   b  can be used for a printing cylinder (at least one of a plate cylinder (a plate cylinder that does not need to be axially moved, e.g., a plate cylinder for printing in black), a blanket cylinder, and an impression cylinder) of a rotary press comprising printing units having various configurations. 
     As shown in  FIG. 2A , in contrast with the first embodiment, an insertion hole  11   a , which is not grooved for attaching a (hole) bearing snap ring  113 , is formed on the driving side of a printing cylinder  10   a , and the insertion hole  11   a  is supported by a printing cylinder bearing  24   a.    
     The printing cylinder bearing  24   a  is, for example, a cylindrical roller bearing (with a collar) that can bear a radial load and an axial load. For example, an NUP-shaped cylindrical roller bearing does not allow its outer ring and inner ring to be separated if the inner ring is fixed. That is, the outer ring of the NUP-shaped cylindrical roller bearing is loaded into the insertion hole  11   a  so that the inner ring and a loose rib are fixed to a driving-side bearing support sleeve  20  by a stepped collar  25  and a bearing lock nut  26 . 
     As shown in  FIG. 2B , in contrast with the first embodiment, on the operating side of the printing cylinder  10   a , an insertion hole  11   a ′ which is not processed for fixing the end of the printing cylinder position adjusting shaft  60  and which is not grooved for attaching the (hole) bearing snap ring  113  is formed, and supported by a printing cylinder bearing  54   a.    
     The printing cylinder bearing  54   a  is, for example, a cylindrical roller bearing (with a collar) that can bear a radial load and an axial load. For example, an NUP-shaped cylindrical roller bearing does not allow its outer ring and inner ring to be separated if the inner ring is fixed. That is, the outer ring of the NUP-shaped cylindrical roller bearing is loaded into the insertion hole  11   a ′ so that the inner ring and a loose rib are fixed to an operating-side bearing support sleeve  50   a  by a stepped collar  55  and a bearing lock nut  56 . 
     Thus, in the present embodiment, the printing cylinder  10   a  is supported by the above-mentioned printing cylinder bearings  24   a  and  54   a , and thereby rotates at an axial predetermined position. 
     The printing cylinder bearing  24   a  and the printing cylinder bearing  54   a  are not exclusively the NUP-shaped cylindrical roller bearings. A bearing such as a conical roller bearing or a combination of these bearings can be used as the printing cylinder bearings. 
     In contrast with the first embodiment, the operating-side bearing support sleeve  50   a  is configured so that no loading hole for loading, for example, a bearing holder  67  is pierced in a flange portion  53   a  and an attachment portion  51   a . The configuration and operation of the printing cylinder device  1   a  according to the present embodiment are substantially similar in other respects to those according to the first embodiment. 
     As described above, the printing cylinder device  1   a  according to the present embodiment is applicable to the printing cylinder  10   a  that does not need positional adjustment in a suitable manner (in such a manner as to reduce the manufacturing costs). Even when high-speed printing is performed, high printing quality can be achieved, and printing efficiency can be improved including a one-page to two-page increase of a printable range in the breadth direction. Moreover, the printing cylinder  10   a  has an axial size substantially equal to the four-page width of a newspaper, and a circumference equal to one page of a newspaper in its longitudinal direction, so that the size of the blanket can be reduced. 
     Furthermore, the printing cylinder  10   a  used in the present embodiment is not grooved for attaching the (hole) bearing snap ring  113 , and is not processed for fixing the end of the printing cylinder position adjusting shaft  60 . However, the printing cylinder  10   a  is not limited thereto. For example, the printing cylinder  10  can be used instead of the printing cylinder  10   a , and common parts can be used for the printing cylinders. 
     Moreover, the operating-side bearing support sleeve  50  can be used instead of the operating-side bearing support sleeve  50   a . Thus, by replacing the printing cylinder bearings  24   a  and  54   a  with the printing cylinder bearings  24  and  54  and providing, for example, the printing cylinder position adjusting shaft  60 , the fixed printing cylinder (printing cylinder  10   a ) can be easily changed to the movable printing cylinder (printing cylinder  10 ). 
     Third Embodiment of Printing Cylinder Device 
       FIG. 3A  shows a schematic sectional view of essential parts on the driving side of a printing cylinder device according to a third embodiment of the present invention. 
       FIG. 3B  shows a schematic sectional view of essential parts on the operating side of the printing cylinder device according to the third embodiment of the present invention. 
     A printing cylinder device  1   b  according to the present embodiment in  FIGS. 3A and 3B  is different from the printing cylinder device  1   a  according to the second embodiment in that a printing cylinder driving shaft  30   b  is provided instead of the printing cylinder driving shaft  30  and so on. The configuration according to the present embodiment is substantially similar in other respects to the configuration of the printing cylinder device  1   a.    
     Accordingly, components in  FIGS. 3A and 3B  similar to those in  FIGS. 2A and 2B  are given the same signs, and are not described in detail. 
     As shown in  FIG. 3A , a flange portion  31   b  is screwed to the driving-side end of the printing cylinder driving shaft  30   b  via a key  32   b . A printing cylinder driving gear  42   b  having an opening in the center is screwed to the driving-side end face of the flange portion  31   b . The flange portion  31   b  has a stepped collar portion on its operating side. The end face of this stepped collar portion comes into contact with an inner ring of a bearing  34   b.    
     The bearing  34   b  is, for example, an angular ball bearing. An inner ring of the bearing  34   b  is fixed to the printing cylinder driving shaft  30   b  by a (shaft) bearing snap ring  33   b  and the stepped collar portion. An outer ring of the bearing  34   b  is fixed to a driving-side bearing support sleeve  20   b  by a step of an attachment portion  21   b  and a bearing holder  28 . 
     At the operating-side end of the printing cylinder driving shaft  30   b , a fit portion  36   b  and a flange portion  35   b  substantially similar in configuration to the fit portion  63  and the flange portion  62  of the printing cylinder position adjusting shaft  60  described above are formed. The fit portion  36   b  is cylindrical, and is inserted into a fit hole of the insertion hole  11   a . The flange portion  35   b  is screwed to a lower step  112 . 
     The attachment portion  21   b  of the driving-side bearing support sleeve  20   b  has a shape corresponding to the bearing  34   b , and the driving-side bearing support sleeve  20   b  is substantially similar in other respects to the driving-side bearing support sleeve  20 . 
     The flange portion  35   b  of the printing cylinder driving shaft  30   b  having the above-described configuration is first screwed to a printing cylinder  10   a , and then the driving-side bearing support sleeve  20   b  is inserted into the insertion hole  11   a , and the printing cylinder  10   a  is supported by a printing cylinder bearing  24   a.    
     Further, the (shaft) bearing snap ring  33   b  is attached, and then the bearing  34   b  is loaded in, and the outer ring of the bearing  34   b  is fixed to the driving-side bearing support sleeve  20   b  by the bearing holder  28 . 
     Moreover, the flange portion  31   b  is screwed to the printing cylinder driving shaft  30   b  via the key  32   b , and then the printing cylinder driving gear  42   b  is screwed thereto. 
     As described above, according to the present embodiment, the printing cylinder driving shaft  30   b  and the driving-side bearing support sleeve  20   b  are used, such that complex machining such as spline processing is not needed, and the number of components can be reduced, thereby enabling the reduction of manufacturing costs. 
     As shown in  FIG. 3B , an operating-side bearing support sleeve  50   b  according to the present embodiment is configured to have an attachment portion  51   b , an insertion portion  52   b , and a flange portion  53   b  in which no through-hole is formed. This eliminates machining for the through-hole and enables the reduction of manufacturing costs. 
     The configuration and operation of the printing cylinder device  1   b  according to the present embodiment are substantially similar in other respects to those according to the second embodiment. 
     As described above, according to the printing cylinder device  1   b  in the present embodiment, manufacturing costs can be reduced by a significant reduction in machining costs. Even when high-speed printing is performed, high printing quality can be achieved, and printing efficiency can be improved including a one-page to two-page increase of a printable range in the breadth direction. 
     One Embodiment of Rotary Press Comprising Printing Cylinder Device 
     The present invention is also effective as an invention of a rotary press comprising a printing cylinder device. 
       FIG. 4  shows a schematic diagram for explaining the rotary press according to one embodiment of the present invention. 
     A newspaper web offset press  2  according to the present embodiment is different from the above-described newspaper web offset press  200  in that blanket cylinders B 1  and plate cylinders P 1  comprising printing cylinder devices  1 ,  1   a , or  1   b  are provided instead of the blanket cylinders B and the plate cylinders P of the printing units U 1 , U 2 , U 3 , U 4 , and U 5 . The configuration according to the present embodiment is substantially similar in other respects to the configuration of the newspaper web offset press  200 . 
     Accordingly, components in  FIG. 4  similar to those in  FIG. 7  are given the same signs, and are not described in detail. 
     The newspaper web offset press  2  according to the present embodiment is provided with the plate cylinders P 1  comprising the printing cylinder devices  1  instead of the plate cylinders P of the printing units U 2 , U 3 , and U 4 , and the blanket cylinders B 1  comprising the printing cylinder devices  1   b  instead of the blanket cylinders B of the printing units U 2 , U 3 , and U 4 . 
     Although the blanket cylinders B 1  comprising the printing cylinder devices  1   b  are provided in the printing units U 2 , U 3 , and U 4 , the present invention is not limited thereto. For example, blanket cylinders B 1  comprising the printing cylinder devices  1   a  may be provided in the printing units U 2 , U 3 , and U 4 . 
     The newspaper web offset press  2  is provided with the plate cylinders P 1  comprising the printing cylinder devices  1  instead of the plate cylinders P of the printing units U 1  and U 5 , and the blanket cylinders B 1  comprising the printing cylinder devices  1   a  instead of the blanket cylinders B of the printing units U 1  and U 5 . 
     Although the plate cylinders P 1  (eight plate cylinders P 1  for each printing unit) comprising the printing cylinder devices  1  are provided in the printing units U 1  and U 5 , the present invention is not limited thereto. For example, plate cylinders P 1  comprising the printing cylinder devices  1   a  may be provided in reference cylinders (plate cylinders for printing in black) of the printing units U 1  and U 5 . 
     Although the blanket cylinders B 1  comprising the printing cylinder devices  1   a  are provided in the printing units U 1  and U 5 , the present invention is not limited thereto. For example, blanket cylinders B 1  comprising the printing cylinder devices  1   b  may be provided in the printing units U 1  and U 5 . 
     As described above, the blanket cylinders B 1  and the plate cylinders P 1  comprising printing cylinder devices  1 ,  1   a , or  1   b  are provided. Thus, a maximum bending amount can be inhibited to a degree that can be absorbed by a rubber layer or cushion layer of the uniform blanket even if the blanket cylinders B 1  and the plate cylinders P 1  are rotated to a maximum speed range in a pressurized state. Thus, transfer impression and printing impression that are fundamental in printing quality can be ensured. 
     Regarding printing efficiency, printing cylinders  10  and  10   a  of the blanket cylinders B 1  and the plate cylinders P 1  have an axial size substantially equal to the four-page width of a newspaper, and a circumference equal to one page of a newspaper in its longitudinal direction, so that the number of produced printing plates attached to the plate cylinder can be reduced by half. Even when the printing plate is frequently changed, the time for producing and replacing the printing plate can be reduced, and running costs can be reduced. 
     Furthermore, the blanket cylinders B 1  and the plate cylinders P 1  are also suitably applicable to the printing cylinders  10  and  10   a  for printing increased in breadth. 
     As described above, according to the newspaper web offset press  2  in the present embodiment, even when high-speed printing is performed, high printing quality can be achieved, and printing efficiency can be improved including a one-page to two-page increase of a printable range in the breadth direction. Moreover, it is possible to reduce running costs by reducing, by half, replacement printing plates or printing plates that do not need to be replaced during a plate change. 
     In the newspaper web offset press  2 , the circumference of the printing cylinders  10  and  10   a  of the blanket cylinders B 1  and the plate cylinders P 1  is equal to one page of a newspaper in its longitudinal direction, but is not limited thereto. For example, the circumference of the printing cylinder  10   a  of the blanket cylinder B 1  may be equal to two pages of a newspaper in its longitudinal direction. The axial position of the blanket cylinder B 1  does not need to be adjusted whether the circumference of the printing cylinder  10   a  is equal to one page or two pages of a newspaper in its longitudinal direction. 
     Although not shown, when the newspaper web offset press  2  uses an impression cylinder, the newspaper web offset press  2  generally comprises a blanket cylinder B 1  having a circumference equal to one page of a newspaper in its longitudinal direction, a plate cylinder P 1  having a circumference equal to one page of a newspaper in its longitudinal direction, and an impression cylinder having a circumference equal to two pages of a newspaper in its longitudinal direction. 
     While the preferred embodiments and so on of the printing cylinder device and the rotary press comprising the printing cylinder device according to the present invention have been shown and described, the printing cylinder device and the rotary press comprising the printing cylinder device according to the present invention are not limited to the embodiments and so on described above. It should be understood that various modifications can be made within the scope of the present invention. 
     For example, the printing cylinder  10  of the printing cylinder device  1  has been described as a plate cylinder, but is also applicable to structures for other printing cylinders or a rotary cylinder that needs the inhibition of bending. 
     DESCRIPTION OF REFERENCE NUMBERS 
     
         
           1 ,  1   a ,  1   b : printing cylinder device 
           2 ,  200 : newspaper web offset press 
           3 : paper feeder (reel splicer) 
           4 : upper structure 
           5 : folder 
           10 ,  10   a : printing cylinder 
           11 ,  11   a ,  11   a ′: insertion hole 
           12 : drive transmission member 
           20 ,  20   b : driving-side bearing support sleeve 
           21 ,  21   b : attachment portion 
           22 : insertion portion 
           23 : flange portion 
           24 ,  24   a : printing cylinder bearing 
           25 : stepped collar 
           26 : bearing lock nut 
           27 : bearing lock nut washer 
           28 : bearing holder 
           30 ,  30   b : printing cylinder driving shaft 
           31 ,  31   b : flange portion 
           32 : external screw 
           32   b : key 
           33 : spline shaft 
           33   b : (shaft) bearing snap ring 
           34 ,  34   b : bearing 
           35 : distance collar 
           35   b : flange portion 
           36 : bearing 
           36   b : fit portion 
           37 : stepped collar 
           38 : bearing lock nut 
           39 : bearing lock nut washer 
           41 : driving-side frame 
           42 ,  42   b : printing cylinder driving gear 
           43 : operating-side frame 
           50 ,  50   a : operating-side bearing support sleeve 
           51 ,  51   a : attachment portion 
           52 : insertion portion 
           53 ,  53   a : flange portion 
           54 ,  54   a : printing cylinder bearing 
           55 : stepped collar 
           56 : bearing lock nut 
           57 : bearing lock nut washer 
           60 : printing cylinder position adjusting shaft 
           61 : external screw 
           62 : flange portion 
           63 : fit portion 
           64 : bearing 
           65 : bearing lock nut 
           66 : bearing lock nut washer 
           67 : bearing holder 
           68 : bearing holder 
           111 : middle-stage step 
           112 : lower step 
           113 : (hole) bearing snap ring 
           681 : internal screw 
         B, B 1 : blanket cylinder 
         P, P 1 : plate cylinder 
         U 1 , U 2 , U 3 , U 4 , U 5 : printing unit