Sheet-feeding mechanism and image processing device using the same

Abstract

The present invention provides a sheet-feeding mechanism and an image processing device using the same. The sheet-feeding mechanism comprises: an upper housing and a lower housing disposed opposite the upper housing, an input tray, a main roller, a separating device, a first auxiliary roller and a first pressing unit.

1 . A sheet-feeding mechanism utilized in an image processing device for feeding a sheet, comprising:
 an upper housing and a lower housing disposed opposite the upper housing, wherein the upper housing and the lower housing form a passageway;   an input tray, connected to the lower housing, for placing the sheet;   a main roller, disposed in the lower housing, for feeding the sheet placed on the input tray in a feeding direction;   a separating device, disposed on a downstream position of the main roller in the lower housing, for feeding the sheet one by one;   a first auxiliary roller, disposed on a lateral side of the main roller in the lower housing, for feeding the sheet in the feeding direction; and   a first pressing unit, disposed in the upper housing and opposite the first auxiliary roller, for pressing the sheet in a downward direction from the upper housing to the lower housing;   wherein the first auxiliary roller and the first pressing unit jointly nip the sheet.   
     
     
         2 . The sheet-feeding mechanism of  claim 1 , wherein the first pressing unit comprises a first roller for contacting with the sheet. 
     
     
         3 . The sheet-feeding mechanism of  claim 1 , wherein the first pressing unit comprises a first weight block for pressing the sheet. 
     
     
         4 . The sheet-feeding mechanism of  claim 1 , wherein the first pressing unit comprises a first elastic unit for pressing the sheet. 
     
     
         5 . The sheet-feeding mechanism of  claim 1 , further comprising:
 a second auxiliary roller, disposed on another lateral side of the main roller in the lower housing, for feeding the sheet in the feeding direction.   
     
     
         6 . The sheet-feeding mechanism of  claim 5 , wherein the first auxiliary roller and the second auxiliary roller are integrated with the main roller. 
     
     
         7 . The sheet-feeding mechanism of  claim 5 , further comprising:
 a second pressing unit, disposed in the upper housing and opposite the second auxiliary roller, for pressing the sheet in a downward direction from the upper housing to the lower housing;   wherein the second auxiliary roller and the second pressing unit jointly nip the sheet.   
     
     
         8 . The sheet-feeding mechanism of  claim 7 , wherein the second pressing unit comprises a second roller for contacting with the sheet. 
     
     
         9 . The sheet-feeding mechanism of  claim 7 , wherein the second pressing unit comprises a second weight block for pressing the sheet. 
     
     
         10 . The sheet-feeding mechanism of  claim 7 , wherein the second pressing unit comprises a second elastic unit for pressing the sheet. 
     
     
         11 . An image processing device, comprising:
 a sheet-feeding mechanism, for feeding a sheet, the sheet-feeding mechanism comprising:
 an upper housing and a lower housing disposed opposite the upper housing, wherein the upper housing and the lower housing form a passageway; 
 an input tray, connected to the lower housing, for placing the sheet; 
 a main roller, disposed in the lower housing, for feeding the sheet placed on the input tray in a feeding direction; 
 a separating device, disposed on a downstream position of the main roller in the lower housing, for feeding the sheet one by one; 
 a first auxiliary roller, disposed on a lateral side of the main roller in the lower housing, for feeding the sheet in the feeding direction; and 
 a first pressing unit, disposed in the upper housing and opposite the first auxiliary roller, for pressing the sheet in a downward direction from the upper housing to the lower housing; and 
   an image processing unit, disposed in the passageway, for processing the sheet fed by the sheet-feeding mechanism;   wherein the first auxiliary roller and the first pressing unit jointly nip the sheet.   
     
     
         12 . The image processing device of  claim 11 , wherein the first pressing unit comprises a first roller for contacting with the sheet. 
     
     
         13 . The image processing device of  claim 11 , wherein the first pressing unit comprises a first weight block for pressing the sheet. 
     
     
         14 . The image processing device of  claim 11 , wherein the first pressing unit comprises a first elastic unit for pressing the sheet. 
     
     
         15 . The image processing device of  claim 11 , further comprising:
 a second auxiliary roller, disposed on another lateral side of the main roller in the lower housing, for feeding the sheet in the feeding direction.   
     
     
         16 . The image processing device of  claim 15 , wherein the first auxiliary roller and the second auxiliary roller are integrated with the main roller. 
     
     
         17 . The image processing device of  claim 15 , wherein the sheet-feeding mechanism further comprises:
 a second pressing unit, disposed in the upper housing and opposite the second auxiliary roller, for pressing the sheet in a downward direction from the upper housing to the lower housing;   wherein the second auxiliary roller and the second pressing unit jointly nip the sheet.   
     
     
         18 . The image processing device of  claim 17 , wherein the second pressing unit comprises a second roller for contacting with the sheet. 
     
     
         19 . The image processing device of  claim 17 , wherein the second pressing unit comprises a second weight block for pressing the sheet. 
     
     
         20 . The image processing device of  claim 17 , wherein the second pressing unit comprises a second elastic unit for pressing the sheet.