Sheet Feeding Device Having Skew Calibration

Abstract

A sheet feeding device having skew calibration which is disposed at a feeding end of a business machine. The sheet feeding device includes a driving module, a feeding module and a differential speed module. The sheet feeding device utilizes the differential speed module to provide the driving power transmitted from the driving module to two feeding rollers of the feeding module respectively, and utilizes the friction difference between these different feeding rollers to change the rotating speed or the rotating direction of the feeding rollers, so as to achieve the objective of actively calibrating the skewed sheet.

1 . A sheet feeding device having skew calibration, disposed in a feeding end of a business machine, the sheet feeding device comprising:
 a driving module, comprising a power source and a driving transmission unit, the driving transmission unit linked to the power source;   a feeding module, comprising a first feeding roller and a second feeding roller, and disposed at the feeding end to feed a plurality of sheets into the business machine; and   a differential speed module, comprising a differential speed mechanism, a first output shaft and a second output shaft, and the differential speed mechanism linked to the driving transmission unit to drive the first output shaft and the second output shaft, and the first output shaft and the second output shaft disposed at two sides of the differential speed mechanism respectively, and the first output shaft and the first feeding roller linked with each other, and the second output shaft and the second feeding roller linked with each other;   wherein the differential speed module utilizes the friction difference generated by the first feeding roller and the second feeding roller during the sheet feeding, to enable one of the first feeding roller and the second feeding roller having a smaller friction to increase a rotating speed, so as to actively calibrate the plurality of sheets skewed.   
     
     
         2 . The sheet feeding device having skew calibration according to  claim 1 , wherein the driving transmission unit comprises a gear set or a timing belt assembly. 
     
     
         3 . The sheet feeding device having skew calibration according to  claim 1 , wherein the differential speed mechanism comprises a planetary gear set, a bevel gear set or a combination thereof. 
     
     
         4 . The sheet feeding device having skew calibration according to  claim 1 , wherein the first feeding roller and the second feeding roller are arranged coaxially. 
     
     
         5 . The sheet feeding device having skew calibration according to  claim 1 , wherein the differential speed module further comprises a torque adjusting unit to adjust a torque required to drive the operation of the differential speed mechanism. 
     
     
         6 . The sheet feeding device having skew calibration according to  claim 1 , wherein the feeding module further comprises a stopper to constrain a skew range of the plurality of sheets. 
     
     
         7 . The sheet feeding device having skew calibration according to  claim 1 , wherein the rotating speeds of the first feeding roller and the second feeding roller are the same or different. 
     
     
         8 . The sheet feeding device having skew calibration according to  claim 1 , wherein each of the first feeding roller and the second feeding roller further has a guiding surface on surface thereof, to facilitate the feeding of the plurality of sheets. 
     
     
         9 . The sheet feeding device having skew calibration according to  claim 8 , wherein the guiding surface comprises small-scale bumpy structures. 
     
     
         10 . The sheet feeding device having skew calibration according to  claim 8 , wherein the guiding surface is a rough surface.