Abstract:
A device for guiding a web includes a frame, a first angle bar angled with respect to the entering web direction and supported by the frame for movement along a first path, the first angle bar having a first and a second side, a second angle bar angled with respect to the entering web direction and supported by the frame for movement along a second path, and a roller for changing a direction of the web between the first angle bar and second angle bar, the roller being moveable along a third path so as to be movable laterally beyond both the first side and second side of the angle bar.

Description:
BACKGROUND INFORMATION 
     The present invention relates generally to web printing presses and more particularly to a device for guiding a printed web. 
     U.S. Pat. No. 5,108,022 discloses a universal web turning system, particularly for printed webs derived from a rotary web-type printing machine. The turning system has a first turning bar and a second turning bar and a first and a second deflection roller which are retained in an essentially rectangular frame. The position of the turning bars is adjustable along the sides of the frame. The deflection rollers may be supported in bearing blocks which can be shifted longitudinally and well as vertically. The first deflection roller is located laterally of a first side of the turning bars, and the second deflection roller is located laterally of a second side of the turning bars, as the bearing blocks for the deflection rollers are located in the same tracks as the turning bars and thus cannot cross over the turning bars 
     U.S. Pat. No. 4,863,087 discloses a running web adjustable guide apparatus in which lateral adjustment of the web can be accomplished without changing the length of the path of the web through the apparatus. A movable roller 21 is linked in movement with a guide bar 14 and runs on the same guide rails as the guide bar. 
     BRIEF SUMMARY OF THE INVENTION 
     U.S. Ser. No. 09/887,291, issued as U.S. Pat. No. 6,705,220, discloses a web guiding device with two movable angle bars, and is hereby incorporated by reference herein. 
     An object of the present invention is to provide movable rollers in combination with angle bars that permit a wider variety of configurations. 
     The present invention provides a device for guiding a web having an entering web direction comprising a frame; a first angle bar angled with respect to the entering web direction and supported by the frame for movement along a first track, the first angle bar having a first side and a second side; a second angle bar angled with respect to the entering web direction and supported by the frame for movement along a second track; and a roller for changing a direction of the web, the roller being movable along a third track so as to be movable laterally beyond both the first side and second side of the first angle bar. 
     By providing the at least one roller on an independent track which permits the roller to cross over the first angle bar in the lateral direction, the roller can be configured to reduce web length in the device and to provide more access space. The roller can also perform additional functions. 
     The first and second angle bars in one web orientation are parallel to each other, and for another web orientation may be moved to be at a 90 degree angle to each other. 
     Preferably, a second roller movable along the third track is included, and is capable of moving to either side of the first angle bar. 
     Each of the first and second rollers may move laterally beyond the frame in one direction, which can provide for a so-called bay window function to provide better web movement between additional angle bars. 
     Preferably, the first, second and third tracks are all horizontal, and the third track is located vertically between the first and second tracks. 
     At least a third and a fourth angle bar and third and fourth roller, configured similarly to the first and second angle bars and roller and second roller, may be provided at a different vertical level and operate independently from the first and second angle bar with the first two rollers. Additional angle bar pairs may be provided at other vertical levels. 
     Preferably, the device has at least two lateral entering and exiting positions for the web, and each angle bar has at least two lateral operating positions and two parking positions on either side of the device. The movable rollers preferably have at least four lateral operating positions. The rollers and angle bars advantageously need not move vertically. More lateral positions however may be provided and the angle bars may be positioned at any location along the lateral extent of the frame. 
     The movable rollers also may be controlled to maintain proper registration, for example print-to-cut registration in a folder, by compensating for changes in web length in the device. 
     A number of operating positions thus may be obtained. Using the two angle bars parallel to each other and both rollers, the web can enter right side up in any of the three lateral position and exit laterally in any of the three lateral positions with the web in the same orientation, i.e. with the web exiting right side up. One roller preferably stays just to the left of the first angle bar, and the other roller just to the right of the second angle bar, so as to reduce overall web travel through the device. 
     To reverse orientation, the web can travel over the first angle bar, reverse direction at the roller and then travel directly over the second angle bar. The second angle bar is at 90 degree angle to the first angle bar, and thus the web exits up side down from the entering direction. The second roller may remain in a parked position. 
     To permit bay window operation, which allow the web to move vertically to the side of the device without interfering with components, the third and fourth angle bars are located below the first and second angle bars. 
     To move the web upwardly using a bay window and maintain orientation, the web can enter at a lower third angle bar right side up, move via the third roller at a position laterally beyond the frame, move vertically upward to the first roller directly above the third roller, pass over the second roller and exit right side up over the second angle bar, the second angle bar being parallel to the third angle bar. If the bay is to be on the other side, the third and fourth rollers can be used, with the second roller being located directly over the fourth roller and the web passing directly from the second roller to the second angle bar. 
     To move the web upwardly and reverse web orientation, the third and second angle bars are placed at 90 degree angles to each other. If the bay is on one side, all four rollers are used, and if on the other, only two rollers need be used. 
     To move the web downwardly with a bay window and maintain web orientation, the first and fourth angle bars are parallel, and for one side the web passes over the first angle bar between the first and second roller and then down to the third roller. The web then passes horizontally to the fourth roller and then over the fourth angle bar to exit right side up. If the bay is on the other side, the web passes from the first angle bar to the first roller and then over to the second roller in a bay position. The web then passes to the fourth roller in its bay position and over the third roller to the fourth angle bar. 
     To move the web downwardly with a bay window and reverse web orientation, the first and fourth angle bars are at 90 degree angles. If the bay is on one side, the first and third rollers are in their bay position, and the second and fourth rollers next to their respective angle bars. If the bay is on the other side, the second and fourth rollers are in their bay positions and the first and third rollers next to the second and fourth rollers, respectively. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       The device according to the present invention is explained in greater detail below with reference to the drawings showing an embodiment with four angle bars and four rollers, in which: 
         FIG. 1  shows the device according to the present invention viewed from the folder toward a printing press, with the web entering at lateral location B and exiting in a same orientation at location A; 
         FIG. 2  shows the device according to the present invention with the web entering at lateral location B and exiting in a same orientation at location B; 
         FIG. 3  shows the device according to the present invention with the web entering at lateral location B and exiting in a same orientation at location C; 
         FIG. 4  shows the device according to the present invention with the web entering at lateral location B and exiting in a reverse orientation at location C; 
         FIG. 5  shows the device according to the present invention with the web entering at lateral location B, passing up a left bay window, and exiting in a same orientation at location B; 
         FIG. 6  shows the device according to the present invention with the web entering at lateral location B, passing up a right bay window, and exiting in a same orientation at location B; 
         FIG. 7  shows the device according to the present invention with the web entering at lateral location B, passing up a left bay window, and exiting in a reverse orientation at location B; 
         FIG. 8  shows the device according to the present invention with the web entering at lateral location B, passing up a right bay window, and exiting in a reverse orientation at location B; 
         FIG. 9  shows the device according to the present invention with the web entering at lateral location B, passing down a left bay window, and exiting in a same orientation at location B; 
         FIG. 10  shows the device according to the present invention with the web entering at lateral location B, passing down a right bay window, and exiting in a same orientation at location B; 
         FIG. 11  shows the device according to the present invention with the web entering at lateral location B, passing down a left bay window, and exiting in a reverse orientation at location B; 
         FIG. 12  shows the device according to the present invention with the web entering at lateral location B, passing down a right bay window, and exiting in a reverse orientation at location B; 
         FIG. 13  shows a schematic perspective view of the top half of the device according to the present invention shown in  FIGS. 1  to  12 ; and 
         FIG. 14  shows the various possible locations of the embodiment of FIG.  1 . 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows an embodiment of the device according to the present invention viewed from the folder toward a printing press, with the web entering at lateral location B and exiting in a same orientation at location A.  FIG. 13  shows a perspective view of the top half  10  of the device of FIG.  1 . In certain operative modes, for example in  FIGS. 1  to  4 , only the top half  10  of the device is used. 
     The web guiding device in  FIGS. 1 and 13  includes a first angle bar  30  at a forty five degree angle to the entering web  100  (entering from the printing press, i.e. the web is moving toward the viewer of FIG.  1 ), which turns the web 90 degrees toward a first movable roller  40 . The web then turns 180 degrees toward a second movable roller  42 , then around another second angle bar  32  parallel to first angle bar  30 . Web then exits (toward the folder, i.e., toward the viewer of  FIG. 1 ) at an exit position  102 . 
     The web  100  thus maintains its right side up orientation and enters at a lateral location B and exits at a lateral location A. Lateral location C, because first roller  40  is close to first angle bar  30 , remains clear, which can be advantageous for maintanence or other operations. A lower section with frame parts  120 ,  122 , a third angle bar  130 , fourth angle bar  132 , third roller  140  and fourth roller  142  remains inactive during the  FIG. 1  mode, although it should be understood that this lower section could operate simulatenously with a different web as web  100  is guided through top half  10 . 
     A frame for the upper section  10  may include frame sections  20 ,  22 . As shown schematically in  FIG. 13 , frame section  20  may have an aperture  120  at the side to permit roller  40  to pass laterally beyond frame section  20 . Frame section  22  may be likewise constructed to permit roller  42  to pass laterally through an aperture. 
     Frame sections  20 ,  22  support a first track  50 , a second track  52  and a third track  54 , which may be located vertically between the first and second tracks. Angle bar  30  can move in laterally in track  50 , and is supported at a front end in  FIG. 13  in another track, so that bar  30  is supported at both ends and can maintain the angle shown in  FIG. 13  or be reversed 90 degrees so as to be 90 degrees with respect to second angle bar  32 . Angle bar  32  likewise runs in track  52 , and likewise can reverse 90 degrees. Rollers  40 ,  42  are supported commonly in track  54  on one end, and by another track  154 , represented by a dashed line, on a front end. The rollers  40 ,  42  and angle bars are automatically movable, for example by linear motors running in the tracks. 
     Rollers  40 ,  42  have a full range of lateral motion between the frames, as do the angle bars  30 ,  32 . Rollers  40 ,  42  can also pass beyond the frame secitons  20 ,  22 , respectively to provide a bay window function. The lower section of the device is contructed similarly, so that angle bars  130 ,  132  and rollers  140  and  142  also have a full range of lateral motion. 
       FIG. 14  shows schematically a range of positions for the embodiment of FIG.  1 . For example, angle bars  30 ,  32 ,  130  and  132  of  FIG. 1  can have any of five lateral locations, including first operating lateral locations  30 A,  32 A,  130 A,  132 A, respectively, second operating lateral locations  30 B,  32 B,  130 B,  132 B, respectively, and third operating lateral locations  30 C,  32 C,  130 C,  132 C, respectively. Two parking positions  30 L and  30 R,  32 L and  32 R,  130 L and  130 R, and  132 L and  132 R, respectively for each angle bar, are provided as well. However, it should be undertood that any number of two or more lateral positions are possible and intermediate positions to those shown in  FIG. 14  are possible as well. 
     Roller  40  may have, for example, five operating positions  40 A,  40 B,  40 C,  40 L, and  40 R. Roller  42  then also may have five operating positions  42 A,  42 B,  42 C,  42 L, and  42 R. Roller  140  may have five operating positions  140 A,  140 B,  140 C,  140 L, and  140 R. Roller  142  may have five operating positions  142 A,  142 B,  142 C,  142 L, and  142 R. It should be understood that any number of two or more positions are possible, and intermediate positions to those shows in  FIG. 14  are possible as well. 
       FIG. 2  shows the device according to the present invention with the web  100  entering at angle bar  30  at lateral location B, passing over rollers  40 ,  42 , and exiting at position  102  in a same orientation at location B over angle bar  32 . 
       FIG. 3  shows the device according to the present invention with the web entering at angle bar  30  at lateral location B, passing over rollers  40 ,  42  and exiting at position  102  in a same orientation at location C over angle bar  32 . 
     Similar to the  FIGS. 1  to  3  positions in which the web enetrs and exits in the same right side up orientation, web  100  also could enter at lateral location A or C, and exit at any lateral location, as long as roller  40  stays to the left of angle bar  30 , and roller  42  to the right of angle bar  32 . 
       FIG. 4  shows the device according to the present invention with web  100  entering over angle bar  30 , now in a 90 degree reversed orientation, at lateral location B. Web  100  then passes over roller  40 , reverses direction and exits over angle bar  32  at position  102  in a reverse orientation upside down from the entering orientation at location C. Rollers  42 ,  140 ,  142  and angle bars  130  and  132  remain in a parked position. 
       FIG. 5  shows the device according to the present invention with web  100  entering at lateral location B over third angle bar  130 , passing over rollers  140  and  40  in their left bay window position, and passing over roller  42 . Web  100  then passes over second angle bar  32  and exits at position  102  in a same up side right orientation at location B. Angle bar  130  may operate from any lateral position A,B,C as can angle bar  32 . 
       FIG. 6  shows web  100  entering at lateral location B over angle bar  130 , passing up a right bay window, and exiting in a same orientation over angle bar  32  at location B. In this configuration, rollers  42  and  142  are located in their right bay positions, and roller  140  is located to the left of angle bar  130 . 
       FIG. 7  shows web  100  entering over angle bar  130  at lateral location B, passing over roller  142 , passing up a left bay window over rollers  140  and  40 , passing over roller  42  and exiting over angle bar  32  at position  102  in a reverse orientation at location B. Angle bar  130  is reversed 90 degrees from the orientation in FIG.  6 . 
       FIG. 8  shows web  100  entering at lateral location B over angle bar  130 , passing up a right bay window over rollers  142  and  42 , and exiting in a reverse orientation over angle bar  32  at location B. 
       FIG. 9  shows the device with web  100  entering at lateral location B over angle bar  30 , passing past roller  42 , down a left bay window with rollers  40 ,  140 , over roller  142 , and exiting over angle bar  132  in a same orientation at location B. 
       FIG. 10  shows web  100  entering at lateral location B over angle bar  30 , passing down a right bay window with rollers  42 ,  142 , over roller  140  to angle bar  132 , exiting in a same orientation at location B. 
       FIG. 11  shows the device according to the present invention with web  100  entering over angle bar  30  (now in a 90 degree reversed orientation) at lateral location B, passing over roller  42  to roller  40  in a left bay window position, down a left bay window over roller  140 , moving laterally to roller  142  and exiting over angle bar  132  in a reverse orientation at location B. 
       FIG. 12  shows web  100  passing over angle bar  30  in its reversed position, passing past roller  40  down a right bay window with rollers  42 ,  142 , past roller  140  and exiting over angle bar  132  in a reverse orientation. 
     While  FIGS. 5  to  12  show lateral location B entrance and lateral location B exit, other lateral entrance and exiting positions are of course possible. 
     In the preferred embodiment, the tracks  50 ,  52 ,  54  define paths for movement by the respectively components.