Paper carrying mechanism

Abstract

The present invention is directed to providing a paper carrying mechanism for a printing device, in which the number of parts and assembly processes can be reduced, and which the carrying deviation does not occur even if a recording medium is reciprocally carried. The paper carrying mechanism for a printer comprises a rotatable carrying roller 2, and a rotatable pressing roller 3 arranged above the carrying roller 2. The pressing roller 3 is arranged to have a gap G of ½ of the thickness of a recording medium 5, between the pressing roller 3 and the carrying roller 2. When the recording medium 5 is carried to the gap G, the pressing roller 3 is pushed up so that the carrying roller 2 is pressed against the recording medium 5 due to the weight of the pressing roller 3.

1 . A paper carrying mechanism comprising: 
 a carrying roller rotationally driven by a driving force of a drive motor, and    a rotatable pressing roller arranged above the carrying roller,    wherein the pressing roller, by its own weight, is adapted to be capable of pressing a recording medium carried between the pressing roller and the carrying roller.    
   
   
       2 . The paper carrying mechanism according to  claim 1 , 
 wherein a gap smaller than a thickness of the recording medium is formed between the pressing roller and the carrying roller.    
   
   
       3 . The paper carrying mechanism according to  claim 2 , 
 wherein the gap is formed to have ½ of the thickness of the recording medium.    
   
   
       4 . The paper carrying mechanism according to  claim 2 , 
 wherein a rotating shaft of the carrying roller is rotatably supported by a casing on a side of a printing device, and a rotating shaft of the pressing roller is supported in a vertically elongated supporting hole formed in the casing so as to be vertically movable, and    wherein when the recording medium is carried to the gap, the pressing roller is pushed up so that the rotating shaft thereof ascends in the elongated hole, and the recording medium is pressed against the carrying roller due to the weight of the pressing roller.    
   
   
       5 . The paper carrying mechanism according to  claim 4 , 
 wherein the gap is formed to have ½ of the thickness of the recording medium.