Document feeding system

Abstract

A document feeding system is disclosed in this present invention. The document feeding system according to this invention can improve the document transfer by employing a carrying device with multiple rotating speeds. Thus the mistakes during the document transfer, such as terminating the document transfer, destroying the document, can be prevented by the above-mentioned document feeding system. Moreover, because an accurate calculation in the disposition of elements in the document feeding system is not necessary, the manufacturing of the above-mentioned document feeding system is simpler than the manufacturing of the document feeding system in the prior art. Hence, this invention can not only improve the efficiency of a document transfer, but also simplify the manufacturing process of a document feeding system.

What is claimed is:  
     
         1 . A document feeding system, comprising: 
 a roller;    a driving means rotating at a first speed, wherein said driving means comprises a trench in said driving means; and    a coupling means for connecting said driving means and said roller, wherein said coupling means comprises a protruding portion in said trench.    
     
     
         2 . The system according to  claim 1 , further comprises an axle for bearing said roller, said driving means, and said coupling means.  
     
     
         3 . The system according to  claim 1 , wherein said coupling means is a one-way spring.  
     
     
         4 . The system according to  claim 1 , wherein said driving means is a gear.  
     
     
         5 . The system according to  claim 1 , further comprises a first step during a document transfer, wherein said roller, said driving means, and said coupling means are rotated at said first speed.  
     
     
         6 . The system according to  claim 1 , further comprises a second step during a document transfer, wherein said roller and said coupling means are rotated at a second speed faster than said first speed of said driving means.  
     
     
         7 . The system according to  claim 1 , further comprises a third step during a document transfer, wherein said roller is rotated at a second speed and faster than said driving means and said coupling means rotating at said first speed.  
     
     
         8 . The system according to  claim 1 , further comprises a fourth step during a document transfer, wherein said roller and said coupling means are rotated at a speed of zero, and said driving means is rotated at said first speed.  
     
     
         9 . A document feeding system, comprising: 
 a roller;    a driving means;    a coupling means for connecting said roller and said driving means;    a first step during a document transfer, wherein said roller, said driving means, and said coupling means are rotated at a first speed;    a second step during said document transfer, wherein said roller and said coupling means are rotated at a second speed faster than said first speed of said driving means;    a third step during said document transfer, wherein said roller is rotated at said second speed faster than said first speed of said driving means and said coupling means; and    a fourth step during said document transfer, wherein said roller and said coupling means are rotated at a third speed slower than said first speed.    
     
     
         10 . The system according to  claim 9 , wherein said driving means comprises a trench.  
     
     
         11 . The system according to  claim 10 , wherein said coupling means comprises a protruding portion in said trench.  
     
     
         12 . The system according to  claim 9 , wherein said driving means is a gear.  
     
     
         13 . The system according to  claim 9 , wherein said coupling means is a one-way spring.  
     
     
         14 . The system according to  claim 9 , wherein said third speed is zero.  
     
     
         15 . A document feeding system, comprising: 
 a roller;    a gear comprising a trench;    a one-way spring for connecting said roller and said gear, wherein said one-way spring comprises a protruding portion disposed in said trench;    a first step during a document transfer, wherein said roller, said gear, and said one-way spring are rotated at a first speed;    a second step during said document transfer, wherein said roller and said one-way spring are rotated at a second speed faster than said first speed of said gear;    a third step during said document transfer, wherein said roller is rotated at said second speed faster than said first speed of said gear and said one-way spring; and    a fourth step during said document transmission, wherein said roller and said one-way spring are rotated at a third speed slower than said first speed.    
     
     
         16 . The system according to  claim 15 , further comprises an axel for bearing said roller, said gear, and said one-way spring.  
     
     
         17 . The system according to  claim 15 , wherein said protruding portion is at a first end of said trench during said first step.  
     
     
         18 . The system according to  claim 15 , wherein said protruding portion is moving from a first end to a second end of said portion during said second step.  
     
     
         19 . The system according to  claim 15 , wherein said protruding portion is at a second end of said trench during said third step.  
     
     
         20 . The system according to  claim 15 , wherein said protruding portion is moving from a second end to a first end of said trench during said third step.  
     
     
         21 . The system according to  claim 15 , wherein said third speed is zero.