Ex parte VOLLENWEIDER - Page 4

               Appeal No. 1998-2179                                                                          Page 4                 
               Application No. 08/433,231                                                                                           

               operator and spread into a rough shingle and conveyed to a holding location 15 and a second                          
               conveyor (belt B4) for periodically stripping off successive signatures from the holding location                    
               to form a uniform shingle which is transported at high speed to a processor.  A barrier or stop                      
               means comprising stop tubes 85 carrying flat plates 85a are located at the holding location 15                       
               such that signatures of the rough shingle flowing inwardly will have their leading edges strike                      
               the plates, thereupon to fall vertically downward so as to create a vertical queue stack 16.  The                    
               second conveyor comprises a belt B4 having a plurality of rows of holes 105 spaced a distance                        
               S apart.  A vacuum chamber 110 having vacuum slots 106 in the top surface thereof is located                         
               beneath the belt B4 such that, when the holes 105 of the belt B4 are aligned with the slots 106,                     
               air is sucked downwardly through the belt.  The weight of the vertical queue stack is controlled                     
               and limited so that until a row of holes 105 reaches the vacuum slots 106, the belt B4 may slide                     
               or slip relative to the lowest non-moving signature in the queue stack.  As a result, a given                        
               signature at the bottom of the queue stack is not moved forwardly with the belt when the                             
               preceding signature begins to move.  Rather, that given signature remains stationary until such                      
               time as the preceding signature has moved a distance equal to the spacing S between the                              
               successive rows of holes.  Thus, successive signatures are started seriatim and pushed                               
               forwardly through the gate beneath the tips 85b of the tubes 85 with the leading edge of each                        
               signature trailing that of the preceding signature by a shingle setback SSB equal to the spacing                     
               S (column 9, lines 40-56 and Figures 10 and 11).                                                                     

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