Sheet reverse controller

Abstract

A sheet reverse controller is equipped with a reverse unit to convey sheets conveyed from the first conveying means in the second direction differing from the first direction; a second conveying means to convey the sheets in the second direction; a sensor provided to the second conveying means to detect the sheets; and a controller to decelerate or accelerate the sheet conveying velocity of the driving rollers based on the detected result of this sensor.

1 . A sheet reverse controller comprising: 
 first conveying means for conveying a sheet in a first direction;    a reverse unit to reverse the sheet conveyed from the first conveying means in a second direction differing from the first direction;    second conveying means for conveying the sheet reversed in the reverse unit in the second direction;    a sensor provided on the second conveying means to detect the sheet;    calculation means for calculating a space between the sheets based on the detected result of the sensor; and    a controller to control the conveying velocity of the second conveying unit so as to decelerate the conveying velocity of the sheet when the space between the sheets is shorter than a specified value and accelerate the conveying velocity of the sheets when a space between the sheets is longer than a specified value.    
   
   
       2 . The sheet reverse controller as set force in  claim 1 , wherein the sensor detects a front end of the sheet and a rear end of the sheet conveyed preceding to the next sheet, 
 the calculating means calculates a gap between the sheets based on the result of detection by the sensor.    
   
   
       3 . The sheet reverse controller as set force in  claim 1 , wherein the sensor detects a front end of the sheet and a front end of the sheet conveyed preceding to the next sheet, 
 the calculating means calculates a pitch between the sheets based on the result of detection by the sensor.    
   
   
       4 . The sheet reverse controller as set force in  claim 1 , wherein the reverse unit includes a normal/reverse rotation roller capable of rotating in a normal/reverse direction and a pinch roller arranged opposing to the normal/reverse rotation roller, the normal/reverse rotation roller rotating in the normal direction and taking the sheet conveyed from the first conveying means and then, the normal/reverse rotation roller rotating in the reverse direction and conveying the taken sheet in the second direction differing from the first direction.  
   
   
       5 . The sheet reverse controller as set force in  claim 1 , wherein the second conveying unit includes a driving roller and a pinch roller arranged opposing to the driving roller so as to hold the sheet, the controller controlling the rotating velocity of the driving roller based on the result of calculation by the calculating means.  
   
   
       6 . A sheet reverse controller comprising: 
 first conveying means for holding and conveying a sheet in a first direction;    a reverse unit to reverse the sheet conveyed from the first conveying means in a second direction differing from the first direction;    second conveying means for conveying the sheet reversed in the reverse unit in the second direction; and    resistance reducing means provided on the first conveying means for reducing a conveying resistance resulting from the holding of the sheet by the first conveying means when the sheet is conveyed to the reverse unit from the first conveying means.    
   
   
       7 . The sheet reverse controller as set force in  claim 6 , wherein the reverse unit includes a normal/reverse rotation roller capable of rotating in a normal/reverse direction and a pinch roller arranged opposing to the normal/reverse rotation roller, the normal/reverse rotation roller rotating in the normal direction and taking the sheet by accelerating the conveying velocity of the sheet conveyed from the first conveying means and then, rotating in the reverse direction and conveying the taken sheet in the second direction differing from the first direction.  
   
   
       8 . The sheet reverse controller as set force in  claim 6 , wherein the resistance reducing means includes a one-way clutch that is rotated and driven only in the first direction.  
   
   
       9 . A sheet reverse controller comprising: 
 a conveying roller equipped with a one-way clutch that is rotated and driven only in a first direction to convey a sheet in a first conveying direction;    a reverse unit to take the sheet from the conveying rollers with a normal/reverse rotation roller capable of rotating in a normal/reverse direction and a pinch roller provided opposing to the normal/reverse rotation roller while accelerating the conveying velocity of the sheet and convey in a second direction differing from the first direction; and    conveying means for conveying the sheet conveyed from the reverse unit in the second direction.    
   
   
       10 . A sheet reverse controller comprising: 
 a conveying belt to hold and convey a sheet in a first direction;    holding force adjusting means provided to the conveying belt detachably for increasing a holding force of the conveying belt to hold the sheet by contacting the conveying belt and decreasing the holding force of the conveying belt to hold the sheet by getting away from the conveying belt;    a reverse unit to take in the sheet conveyed from the conveying belt while accelerating the conveying velocity of the sheet by a normal/reverse rotation roller capable of rotating in the normal/reverse direction and convey the sheet in a second direction differing from the first direction;    conveying means for conveying the sheet conveyed from the reverse unit in the second direction; and    a controller to control the holding force adjusting means so as to reduce the holding force of the conveying belt by operating the holding force adjusting means.    
   
   
       11 . A sheet reverse controller comprising: 
 a conveying roller equipped with a one-way clutch that is rotated and driven in a first direction only to convey a sheet in a first direction at a first conveying velocity;    an acceleration drive roller to convey the sheet conveyed from the conveying roller in the first direction at a second conveying velocity faster than the first conveying velocity;    a reverse unit to take the sheet conveyed from the acceleration drive roller at the second conveying velocity by a normal/reverse rotation roller capable of rotating in a normal/reverse direction and a pinch roller provided opposing to the normal/reverse rotation roller and convey in a second direction differing from the first direction; and    conveying means for conveying the sheet conveyed from the reverse unit in the second direction.    
   
   
       12 . The sheet reverse controller as set force in  claim 11  further comprising: 
 a sensor provided at the upper stream side in the conveying direction from the reverse unit to detect a rear end of the sheet,    wherein the reverse unit decelerates the conveying velocity of the sheet and stops the sheet based on the detection result of the sensor.    
   
   
       13 . The sheet reverse controller as set force in  claim 11 , wherein the acceleration drive roller is equipped with a one-way clutch that is rotated and driven in a first direction only, and 
 the reverse unit accelerates the sheet that is conveyed by the acceleration drive roller to a third conveying velocity faster than the second conveying velocity.